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[media] it913x: add chip device ids for binding
[linux-2.6/btrfs-unstable.git] / drivers / crypto / atmel-aes.c
blob0e3d0d655b9679a113d7934f6566532968a15522
1 /*
2 * Cryptographic API.
3 *
4 * Support for ATMEL AES HW acceleration.
5 *
6 * Copyright (c) 2012 Eukréa Electromatique - ATMEL
7 * Author: Nicolas Royer <nicolas@eukrea.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as published
11 * by the Free Software Foundation.
12 *
13 * Some ideas are from omap-aes.c driver.
14 */
15
16
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/slab.h>
20 #include <linux/err.h>
21 #include <linux/clk.h>
22 #include <linux/io.h>
23 #include <linux/hw_random.h>
24 #include <linux/platform_device.h>
25
26 #include <linux/device.h>
27 #include <linux/init.h>
28 #include <linux/errno.h>
29 #include <linux/interrupt.h>
30 #include <linux/irq.h>
31 #include <linux/scatterlist.h>
32 #include <linux/dma-mapping.h>
33 #include <linux/of_device.h>
34 #include <linux/delay.h>
35 #include <linux/crypto.h>
36 #include <crypto/scatterwalk.h>
37 #include <crypto/algapi.h>
38 #include <crypto/aes.h>
39 #include <crypto/xts.h>
40 #include <crypto/internal/aead.h>
41 #include <linux/platform_data/crypto-atmel.h>
42 #include <dt-bindings/dma/at91.h>
43 #include "atmel-aes-regs.h"
44
45 #define ATMEL_AES_PRIORITY 300
46
47 #define ATMEL_AES_BUFFER_ORDER 2
48 #define ATMEL_AES_BUFFER_SIZE (PAGE_SIZE << ATMEL_AES_BUFFER_ORDER)
49
50 #define CFB8_BLOCK_SIZE 1
51 #define CFB16_BLOCK_SIZE 2
52 #define CFB32_BLOCK_SIZE 4
53 #define CFB64_BLOCK_SIZE 8
54
55 #define SIZE_IN_WORDS(x) ((x) >> 2)
56
57 /* AES flags */
58 /* Reserve bits [18:16] [14:12] [1:0] for mode (same as for AES_MR) */
59 #define AES_FLAGS_ENCRYPT AES_MR_CYPHER_ENC
60 #define AES_FLAGS_GTAGEN AES_MR_GTAGEN
61 #define AES_FLAGS_OPMODE_MASK (AES_MR_OPMOD_MASK | AES_MR_CFBS_MASK)
62 #define AES_FLAGS_ECB AES_MR_OPMOD_ECB
63 #define AES_FLAGS_CBC AES_MR_OPMOD_CBC
64 #define AES_FLAGS_OFB AES_MR_OPMOD_OFB
65 #define AES_FLAGS_CFB128 (AES_MR_OPMOD_CFB | AES_MR_CFBS_128b)
66 #define AES_FLAGS_CFB64 (AES_MR_OPMOD_CFB | AES_MR_CFBS_64b)
67 #define AES_FLAGS_CFB32 (AES_MR_OPMOD_CFB | AES_MR_CFBS_32b)
68 #define AES_FLAGS_CFB16 (AES_MR_OPMOD_CFB | AES_MR_CFBS_16b)
69 #define AES_FLAGS_CFB8 (AES_MR_OPMOD_CFB | AES_MR_CFBS_8b)
70 #define AES_FLAGS_CTR AES_MR_OPMOD_CTR
71 #define AES_FLAGS_GCM AES_MR_OPMOD_GCM
72 #define AES_FLAGS_XTS AES_MR_OPMOD_XTS
73
74 #define AES_FLAGS_MODE_MASK (AES_FLAGS_OPMODE_MASK | \
75 AES_FLAGS_ENCRYPT | \
76 AES_FLAGS_GTAGEN)
77
78 #define AES_FLAGS_INIT BIT(2)
79 #define AES_FLAGS_BUSY BIT(3)
80 #define AES_FLAGS_DUMP_REG BIT(4)
81
82 #define AES_FLAGS_PERSISTENT (AES_FLAGS_INIT | AES_FLAGS_BUSY)
83
84 #define ATMEL_AES_QUEUE_LENGTH 50
85
86 #define ATMEL_AES_DMA_THRESHOLD 256
87
88
89 struct atmel_aes_caps {
90 bool has_dualbuff;
91 bool has_cfb64;
92 bool has_ctr32;
93 bool has_gcm;
94 bool has_xts;
95 u32 max_burst_size;
96 };
97
98 struct atmel_aes_dev;
99
100
101 typedef int (*atmel_aes_fn_t)(struct atmel_aes_dev *);
102
103
104 struct atmel_aes_base_ctx {
105 struct atmel_aes_dev *dd;
106 atmel_aes_fn_t start;
107 int keylen;
108 u32 key[AES_KEYSIZE_256 / sizeof(u32)];
109 u16 block_size;
110 };
111
112 struct atmel_aes_ctx {
113 struct atmel_aes_base_ctx base;
114 };
115
116 struct atmel_aes_ctr_ctx {
117 struct atmel_aes_base_ctx base;
118
119 u32 iv[AES_BLOCK_SIZE / sizeof(u32)];
120 size_t offset;
121 struct scatterlist src[2];
122 struct scatterlist dst[2];
123 };
124
125 struct atmel_aes_gcm_ctx {
126 struct atmel_aes_base_ctx base;
127
128 struct scatterlist src[2];
129 struct scatterlist dst[2];
130
131 u32 j0[AES_BLOCK_SIZE / sizeof(u32)];
132 u32 tag[AES_BLOCK_SIZE / sizeof(u32)];
133 u32 ghash[AES_BLOCK_SIZE / sizeof(u32)];
134 size_t textlen;
135
136 const u32 *ghash_in;
137 u32 *ghash_out;
138 atmel_aes_fn_t ghash_resume;
139 };
140
141 struct atmel_aes_xts_ctx {
142 struct atmel_aes_base_ctx base;
143
144 u32 key2[AES_KEYSIZE_256 / sizeof(u32)];
145 };
146
147 struct atmel_aes_reqctx {
148 unsigned long mode;
149 };
150
151 struct atmel_aes_dma {
152 struct dma_chan *chan;
153 struct scatterlist *sg;
154 int nents;
155 unsigned int remainder;
156 unsigned int sg_len;
157 };
158
159 struct atmel_aes_dev {
160 struct list_head list;
161 unsigned long phys_base;
162 void __iomem *io_base;
163
164 struct crypto_async_request *areq;
165 struct atmel_aes_base_ctx *ctx;
166
167 bool is_async;
168 atmel_aes_fn_t resume;
169 atmel_aes_fn_t cpu_transfer_complete;
170
171 struct device *dev;
172 struct clk *iclk;
173 int irq;
174
175 unsigned long flags;
176
177 spinlock_t lock;
178 struct crypto_queue queue;
179
180 struct tasklet_struct done_task;
181 struct tasklet_struct queue_task;
182
183 size_t total;
184 size_t datalen;
185 u32 *data;
186
187 struct atmel_aes_dma src;
188 struct atmel_aes_dma dst;
189
190 size_t buflen;
191 void *buf;
192 struct scatterlist aligned_sg;
193 struct scatterlist *real_dst;
194
195 struct atmel_aes_caps caps;
196
197 u32 hw_version;
198 };
199
200 struct atmel_aes_drv {
201 struct list_head dev_list;
202 spinlock_t lock;
203 };
204
205 static struct atmel_aes_drv atmel_aes = {
206 .dev_list = LIST_HEAD_INIT(atmel_aes.dev_list),
207 .lock = __SPIN_LOCK_UNLOCKED(atmel_aes.lock),
208 };
209
210 #ifdef VERBOSE_DEBUG
211 static const char *atmel_aes_reg_name(u32 offset, char *tmp, size_t sz)
212 {
213 switch (offset) {
214 case AES_CR:
215 return "CR";
216
217 case AES_MR:
218 return "MR";
219
220 case AES_ISR:
221 return "ISR";
222
223 case AES_IMR:
224 return "IMR";
225
226 case AES_IER:
227 return "IER";
228
229 case AES_IDR:
230 return "IDR";
231
232 case AES_KEYWR(0):
233 case AES_KEYWR(1):
234 case AES_KEYWR(2):
235 case AES_KEYWR(3):
236 case AES_KEYWR(4):
237 case AES_KEYWR(5):
238 case AES_KEYWR(6):
239 case AES_KEYWR(7):
240 snprintf(tmp, sz, "KEYWR[%u]", (offset - AES_KEYWR(0)) >> 2);
241 break;
242
243 case AES_IDATAR(0):
244 case AES_IDATAR(1):
245 case AES_IDATAR(2):
246 case AES_IDATAR(3):
247 snprintf(tmp, sz, "IDATAR[%u]", (offset - AES_IDATAR(0)) >> 2);
248 break;
249
250 case AES_ODATAR(0):
251 case AES_ODATAR(1):
252 case AES_ODATAR(2):
253 case AES_ODATAR(3):
254 snprintf(tmp, sz, "ODATAR[%u]", (offset - AES_ODATAR(0)) >> 2);
255 break;
256
257 case AES_IVR(0):
258 case AES_IVR(1):
259 case AES_IVR(2):
260 case AES_IVR(3):
261 snprintf(tmp, sz, "IVR[%u]", (offset - AES_IVR(0)) >> 2);
262 break;
263
264 case AES_AADLENR:
265 return "AADLENR";
266
267 case AES_CLENR:
268 return "CLENR";
269
270 case AES_GHASHR(0):
271 case AES_GHASHR(1):
272 case AES_GHASHR(2):
273 case AES_GHASHR(3):
274 snprintf(tmp, sz, "GHASHR[%u]", (offset - AES_GHASHR(0)) >> 2);
275 break;
276
277 case AES_TAGR(0):
278 case AES_TAGR(1):
279 case AES_TAGR(2):
280 case AES_TAGR(3):
281 snprintf(tmp, sz, "TAGR[%u]", (offset - AES_TAGR(0)) >> 2);
282 break;
283
284 case AES_CTRR:
285 return "CTRR";
286
287 case AES_GCMHR(0):
288 case AES_GCMHR(1):
289 case AES_GCMHR(2):
290 case AES_GCMHR(3):
291 snprintf(tmp, sz, "GCMHR[%u]", (offset - AES_GCMHR(0)) >> 2);
292 break;
293
294 case AES_TWR(0):
295 case AES_TWR(1):
296 case AES_TWR(2):
297 case AES_TWR(3):
298 snprintf(tmp, sz, "TWR[%u]", (offset - AES_TWR(0)) >> 2);
299 break;
300
301 case AES_ALPHAR(0):
302 case AES_ALPHAR(1):
303 case AES_ALPHAR(2):
304 case AES_ALPHAR(3):
305 snprintf(tmp, sz, "ALPHAR[%u]", (offset - AES_ALPHAR(0)) >> 2);
306 break;
307
308 default:
309 snprintf(tmp, sz, "0x%02x", offset);
310 break;
311 }
312
313 return tmp;
314 }
315 #endif /* VERBOSE_DEBUG */
316
317 /* Shared functions */
318
319 static inline u32 atmel_aes_read(struct atmel_aes_dev *dd, u32 offset)
320 {
321 u32 value = readl_relaxed(dd->io_base + offset);
322
323 #ifdef VERBOSE_DEBUG
324 if (dd->flags & AES_FLAGS_DUMP_REG) {
325 char tmp[16];
326
327 dev_vdbg(dd->dev, "read 0x%08x from %s\n", value,
328 atmel_aes_reg_name(offset, tmp, sizeof(tmp)));
329 }
330 #endif /* VERBOSE_DEBUG */
331
332 return value;
333 }
334
335 static inline void atmel_aes_write(struct atmel_aes_dev *dd,
336 u32 offset, u32 value)
337 {
338 #ifdef VERBOSE_DEBUG
339 if (dd->flags & AES_FLAGS_DUMP_REG) {
340 char tmp[16];
341
342 dev_vdbg(dd->dev, "write 0x%08x into %s\n", value,
343 atmel_aes_reg_name(offset, tmp, sizeof(tmp)));
344 }
345 #endif /* VERBOSE_DEBUG */
346
347 writel_relaxed(value, dd->io_base + offset);
348 }
349
350 static void atmel_aes_read_n(struct atmel_aes_dev *dd, u32 offset,
351 u32 *value, int count)
352 {
353 for (; count--; value++, offset += 4)
354 *value = atmel_aes_read(dd, offset);
355 }
356
357 static void atmel_aes_write_n(struct atmel_aes_dev *dd, u32 offset,
358 const u32 *value, int count)
359 {
360 for (; count--; value++, offset += 4)
361 atmel_aes_write(dd, offset, *value);
362 }
363
364 static inline void atmel_aes_read_block(struct atmel_aes_dev *dd, u32 offset,
365 u32 *value)
366 {
367 atmel_aes_read_n(dd, offset, value, SIZE_IN_WORDS(AES_BLOCK_SIZE));
368 }
369
370 static inline void atmel_aes_write_block(struct atmel_aes_dev *dd, u32 offset,
371 const u32 *value)
372 {
373 atmel_aes_write_n(dd, offset, value, SIZE_IN_WORDS(AES_BLOCK_SIZE));
374 }
375
376 static inline int atmel_aes_wait_for_data_ready(struct atmel_aes_dev *dd,
377 atmel_aes_fn_t resume)
378 {
379 u32 isr = atmel_aes_read(dd, AES_ISR);
380
381 if (unlikely(isr & AES_INT_DATARDY))
382 return resume(dd);
383
384 dd->resume = resume;
385 atmel_aes_write(dd, AES_IER, AES_INT_DATARDY);
386 return -EINPROGRESS;
387 }
388
389 static inline size_t atmel_aes_padlen(size_t len, size_t block_size)
390 {
391 len &= block_size - 1;
392 return len ? block_size - len : 0;
393 }
394
395 static struct atmel_aes_dev *atmel_aes_find_dev(struct atmel_aes_base_ctx *ctx)
396 {
397 struct atmel_aes_dev *aes_dd = NULL;
398 struct atmel_aes_dev *tmp;
399
400 spin_lock_bh(&atmel_aes.lock);
401 if (!ctx->dd) {
402 list_for_each_entry(tmp, &atmel_aes.dev_list, list) {
403 aes_dd = tmp;
404 break;
405 }
406 ctx->dd = aes_dd;
407 } else {
408 aes_dd = ctx->dd;
409 }
410
411 spin_unlock_bh(&atmel_aes.lock);
412
413 return aes_dd;
414 }
415
416 static int atmel_aes_hw_init(struct atmel_aes_dev *dd)
417 {
418 int err;
419
420 err = clk_enable(dd->iclk);
421 if (err)
422 return err;
423
424 if (!(dd->flags & AES_FLAGS_INIT)) {
425 atmel_aes_write(dd, AES_CR, AES_CR_SWRST);
426 atmel_aes_write(dd, AES_MR, 0xE << AES_MR_CKEY_OFFSET);
427 dd->flags |= AES_FLAGS_INIT;
428 }
429
430 return 0;
431 }
432
433 static inline unsigned int atmel_aes_get_version(struct atmel_aes_dev *dd)
434 {
435 return atmel_aes_read(dd, AES_HW_VERSION) & 0x00000fff;
436 }
437
438 static int atmel_aes_hw_version_init(struct atmel_aes_dev *dd)
439 {
440 int err;
441
442 err = atmel_aes_hw_init(dd);
443 if (err)
444 return err;
445
446 dd->hw_version = atmel_aes_get_version(dd);
447
448 dev_info(dd->dev, "version: 0x%x\n", dd->hw_version);
449
450 clk_disable(dd->iclk);
451 return 0;
452 }
453
454 static inline void atmel_aes_set_mode(struct atmel_aes_dev *dd,
455 const struct atmel_aes_reqctx *rctx)
456 {
457 /* Clear all but persistent flags and set request flags. */
458 dd->flags = (dd->flags & AES_FLAGS_PERSISTENT) | rctx->mode;
459 }
460
461 static inline bool atmel_aes_is_encrypt(const struct atmel_aes_dev *dd)
462 {
463 return (dd->flags & AES_FLAGS_ENCRYPT);
464 }
465
466 static inline int atmel_aes_complete(struct atmel_aes_dev *dd, int err)
467 {
468 clk_disable(dd->iclk);
469 dd->flags &= ~AES_FLAGS_BUSY;
470
471 if (dd->is_async)
472 dd->areq->complete(dd->areq, err);
473
474 tasklet_schedule(&dd->queue_task);
475
476 return err;
477 }
478
479 static void atmel_aes_write_ctrl_key(struct atmel_aes_dev *dd, bool use_dma,
480 const u32 *iv, const u32 *key, int keylen)
481 {
482 u32 valmr = 0;
483
484 /* MR register must be set before IV registers */
485 if (keylen == AES_KEYSIZE_128)
486 valmr |= AES_MR_KEYSIZE_128;
487 else if (keylen == AES_KEYSIZE_192)
488 valmr |= AES_MR_KEYSIZE_192;
489 else
490 valmr |= AES_MR_KEYSIZE_256;
491
492 valmr |= dd->flags & AES_FLAGS_MODE_MASK;
493
494 if (use_dma) {
495 valmr |= AES_MR_SMOD_IDATAR0;
496 if (dd->caps.has_dualbuff)
497 valmr |= AES_MR_DUALBUFF;
498 } else {
499 valmr |= AES_MR_SMOD_AUTO;
500 }
501
502 atmel_aes_write(dd, AES_MR, valmr);
503
504 atmel_aes_write_n(dd, AES_KEYWR(0), key, SIZE_IN_WORDS(keylen));
505
506 if (iv && (valmr & AES_MR_OPMOD_MASK) != AES_MR_OPMOD_ECB)
507 atmel_aes_write_block(dd, AES_IVR(0), iv);
508 }
509
510 static inline void atmel_aes_write_ctrl(struct atmel_aes_dev *dd, bool use_dma,
511 const u32 *iv)
512
513 {
514 atmel_aes_write_ctrl_key(dd, use_dma, iv,
515 dd->ctx->key, dd->ctx->keylen);
516 }
517
518 /* CPU transfer */
519
520 static int atmel_aes_cpu_transfer(struct atmel_aes_dev *dd)
521 {
522 int err = 0;
523 u32 isr;
524
525 for (;;) {
526 atmel_aes_read_block(dd, AES_ODATAR(0), dd->data);
527 dd->data += 4;
528 dd->datalen -= AES_BLOCK_SIZE;
529
530 if (dd->datalen < AES_BLOCK_SIZE)
531 break;
532
533 atmel_aes_write_block(dd, AES_IDATAR(0), dd->data);
534
535 isr = atmel_aes_read(dd, AES_ISR);
536 if (!(isr & AES_INT_DATARDY)) {
537 dd->resume = atmel_aes_cpu_transfer;
538 atmel_aes_write(dd, AES_IER, AES_INT_DATARDY);
539 return -EINPROGRESS;
540 }
541 }
542
543 if (!sg_copy_from_buffer(dd->real_dst, sg_nents(dd->real_dst),
544 dd->buf, dd->total))
545 err = -EINVAL;
546
547 if (err)
548 return atmel_aes_complete(dd, err);
549
550 return dd->cpu_transfer_complete(dd);
551 }
552
553 static int atmel_aes_cpu_start(struct atmel_aes_dev *dd,
554 struct scatterlist *src,
555 struct scatterlist *dst,
556 size_t len,
557 atmel_aes_fn_t resume)
558 {
559 size_t padlen = atmel_aes_padlen(len, AES_BLOCK_SIZE);
560
561 if (unlikely(len == 0))
562 return -EINVAL;
563
564 sg_copy_to_buffer(src, sg_nents(src), dd->buf, len);
565
566 dd->total = len;
567 dd->real_dst = dst;
568 dd->cpu_transfer_complete = resume;
569 dd->datalen = len + padlen;
570 dd->data = (u32 *)dd->buf;
571 atmel_aes_write_block(dd, AES_IDATAR(0), dd->data);
572 return atmel_aes_wait_for_data_ready(dd, atmel_aes_cpu_transfer);
573 }
574
575
576 /* DMA transfer */
577
578 static void atmel_aes_dma_callback(void *data);
579
580 static bool atmel_aes_check_aligned(struct atmel_aes_dev *dd,
581 struct scatterlist *sg,
582 size_t len,
583 struct atmel_aes_dma *dma)
584 {
585 int nents;
586
587 if (!IS_ALIGNED(len, dd->ctx->block_size))
588 return false;
589
590 for (nents = 0; sg; sg = sg_next(sg), ++nents) {
591 if (!IS_ALIGNED(sg->offset, sizeof(u32)))
592 return false;
593
594 if (len <= sg->length) {
595 if (!IS_ALIGNED(len, dd->ctx->block_size))
596 return false;
597
598 dma->nents = nents+1;
599 dma->remainder = sg->length - len;
600 sg->length = len;
601 return true;
602 }
603
604 if (!IS_ALIGNED(sg->length, dd->ctx->block_size))
605 return false;
606
607 len -= sg->length;
608 }
609
610 return false;
611 }
612
613 static inline void atmel_aes_restore_sg(const struct atmel_aes_dma *dma)
614 {
615 struct scatterlist *sg = dma->sg;
616 int nents = dma->nents;
617
618 if (!dma->remainder)
619 return;
620
621 while (--nents > 0 && sg)
622 sg = sg_next(sg);
623
624 if (!sg)
625 return;
626
627 sg->length += dma->remainder;
628 }
629
630 static int atmel_aes_map(struct atmel_aes_dev *dd,
631 struct scatterlist *src,
632 struct scatterlist *dst,
633 size_t len)
634 {
635 bool src_aligned, dst_aligned;
636 size_t padlen;
637
638 dd->total = len;
639 dd->src.sg = src;
640 dd->dst.sg = dst;
641 dd->real_dst = dst;
642
643 src_aligned = atmel_aes_check_aligned(dd, src, len, &dd->src);
644 if (src == dst)
645 dst_aligned = src_aligned;
646 else
647 dst_aligned = atmel_aes_check_aligned(dd, dst, len, &dd->dst);
648 if (!src_aligned || !dst_aligned) {
649 padlen = atmel_aes_padlen(len, dd->ctx->block_size);
650
651 if (dd->buflen < len + padlen)
652 return -ENOMEM;
653
654 if (!src_aligned) {
655 sg_copy_to_buffer(src, sg_nents(src), dd->buf, len);
656 dd->src.sg = &dd->aligned_sg;
657 dd->src.nents = 1;
658 dd->src.remainder = 0;
659 }
660
661 if (!dst_aligned) {
662 dd->dst.sg = &dd->aligned_sg;
663 dd->dst.nents = 1;
664 dd->dst.remainder = 0;
665 }
666
667 sg_init_table(&dd->aligned_sg, 1);
668 sg_set_buf(&dd->aligned_sg, dd->buf, len + padlen);
669 }
670
671 if (dd->src.sg == dd->dst.sg) {
672 dd->src.sg_len = dma_map_sg(dd->dev, dd->src.sg, dd->src.nents,
673 DMA_BIDIRECTIONAL);
674 dd->dst.sg_len = dd->src.sg_len;
675 if (!dd->src.sg_len)
676 return -EFAULT;
677 } else {
678 dd->src.sg_len = dma_map_sg(dd->dev, dd->src.sg, dd->src.nents,
679 DMA_TO_DEVICE);
680 if (!dd->src.sg_len)
681 return -EFAULT;
682
683 dd->dst.sg_len = dma_map_sg(dd->dev, dd->dst.sg, dd->dst.nents,
684 DMA_FROM_DEVICE);
685 if (!dd->dst.sg_len) {
686 dma_unmap_sg(dd->dev, dd->src.sg, dd->src.nents,
687 DMA_TO_DEVICE);
688 return -EFAULT;
689 }
690 }
691
692 return 0;
693 }
694
695 static void atmel_aes_unmap(struct atmel_aes_dev *dd)
696 {
697 if (dd->src.sg == dd->dst.sg) {
698 dma_unmap_sg(dd->dev, dd->src.sg, dd->src.nents,
699 DMA_BIDIRECTIONAL);
700
701 if (dd->src.sg != &dd->aligned_sg)
702 atmel_aes_restore_sg(&dd->src);
703 } else {
704 dma_unmap_sg(dd->dev, dd->dst.sg, dd->dst.nents,
705 DMA_FROM_DEVICE);
706
707 if (dd->dst.sg != &dd->aligned_sg)
708 atmel_aes_restore_sg(&dd->dst);
709
710 dma_unmap_sg(dd->dev, dd->src.sg, dd->src.nents,
711 DMA_TO_DEVICE);
712
713 if (dd->src.sg != &dd->aligned_sg)
714 atmel_aes_restore_sg(&dd->src);
715 }
716
717 if (dd->dst.sg == &dd->aligned_sg)
718 sg_copy_from_buffer(dd->real_dst, sg_nents(dd->real_dst),
719 dd->buf, dd->total);
720 }
721
722 static int atmel_aes_dma_transfer_start(struct atmel_aes_dev *dd,
723 enum dma_slave_buswidth addr_width,
724 enum dma_transfer_direction dir,
725 u32 maxburst)
726 {
727 struct dma_async_tx_descriptor *desc;
728 struct dma_slave_config config;
729 dma_async_tx_callback callback;
730 struct atmel_aes_dma *dma;
731 int err;
732
733 memset(&config, 0, sizeof(config));
734 config.direction = dir;
735 config.src_addr_width = addr_width;
736 config.dst_addr_width = addr_width;
737 config.src_maxburst = maxburst;
738 config.dst_maxburst = maxburst;
739
740 switch (dir) {
741 case DMA_MEM_TO_DEV:
742 dma = &dd->src;
743 callback = NULL;
744 config.dst_addr = dd->phys_base + AES_IDATAR(0);
745 break;
746
747 case DMA_DEV_TO_MEM:
748 dma = &dd->dst;
749 callback = atmel_aes_dma_callback;
750 config.src_addr = dd->phys_base + AES_ODATAR(0);
751 break;
752
753 default:
754 return -EINVAL;
755 }
756
757 err = dmaengine_slave_config(dma->chan, &config);
758 if (err)
759 return err;
760
761 desc = dmaengine_prep_slave_sg(dma->chan, dma->sg, dma->sg_len, dir,
762 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
763 if (!desc)
764 return -ENOMEM;
765
766 desc->callback = callback;
767 desc->callback_param = dd;
768 dmaengine_submit(desc);
769 dma_async_issue_pending(dma->chan);
770
771 return 0;
772 }
773
774 static void atmel_aes_dma_transfer_stop(struct atmel_aes_dev *dd,
775 enum dma_transfer_direction dir)
776 {
777 struct atmel_aes_dma *dma;
778
779 switch (dir) {
780 case DMA_MEM_TO_DEV:
781 dma = &dd->src;
782 break;
783
784 case DMA_DEV_TO_MEM:
785 dma = &dd->dst;
786 break;
787
788 default:
789 return;
790 }
791
792 dmaengine_terminate_all(dma->chan);
793 }
794
795 static int atmel_aes_dma_start(struct atmel_aes_dev *dd,
796 struct scatterlist *src,
797 struct scatterlist *dst,
798 size_t len,
799 atmel_aes_fn_t resume)
800 {
801 enum dma_slave_buswidth addr_width;
802 u32 maxburst;
803 int err;
804
805 switch (dd->ctx->block_size) {
806 case CFB8_BLOCK_SIZE:
807 addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
808 maxburst = 1;
809 break;
810
811 case CFB16_BLOCK_SIZE:
812 addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
813 maxburst = 1;
814 break;
815
816 case CFB32_BLOCK_SIZE:
817 case CFB64_BLOCK_SIZE:
818 addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
819 maxburst = 1;
820 break;
821
822 case AES_BLOCK_SIZE:
823 addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
824 maxburst = dd->caps.max_burst_size;
825 break;
826
827 default:
828 err = -EINVAL;
829 goto exit;
830 }
831
832 err = atmel_aes_map(dd, src, dst, len);
833 if (err)
834 goto exit;
835
836 dd->resume = resume;
837
838 /* Set output DMA transfer first */
839 err = atmel_aes_dma_transfer_start(dd, addr_width, DMA_DEV_TO_MEM,
840 maxburst);
841 if (err)
842 goto unmap;
843
844 /* Then set input DMA transfer */
845 err = atmel_aes_dma_transfer_start(dd, addr_width, DMA_MEM_TO_DEV,
846 maxburst);
847 if (err)
848 goto output_transfer_stop;
849
850 return -EINPROGRESS;
851
852 output_transfer_stop:
853 atmel_aes_dma_transfer_stop(dd, DMA_DEV_TO_MEM);
854 unmap:
855 atmel_aes_unmap(dd);
856 exit:
857 return atmel_aes_complete(dd, err);
858 }
859
860 static void atmel_aes_dma_stop(struct atmel_aes_dev *dd)
861 {
862 atmel_aes_dma_transfer_stop(dd, DMA_MEM_TO_DEV);
863 atmel_aes_dma_transfer_stop(dd, DMA_DEV_TO_MEM);
864 atmel_aes_unmap(dd);
865 }
866
867 static void atmel_aes_dma_callback(void *data)
868 {
869 struct atmel_aes_dev *dd = data;
870
871 atmel_aes_dma_stop(dd);
872 dd->is_async = true;
873 (void)dd->resume(dd);
874 }
875
876 static int atmel_aes_handle_queue(struct atmel_aes_dev *dd,
877 struct crypto_async_request *new_areq)
878 {
879 struct crypto_async_request *areq, *backlog;
880 struct atmel_aes_base_ctx *ctx;
881 unsigned long flags;
882 int err, ret = 0;
883
884 spin_lock_irqsave(&dd->lock, flags);
885 if (new_areq)
886 ret = crypto_enqueue_request(&dd->queue, new_areq);
887 if (dd->flags & AES_FLAGS_BUSY) {
888 spin_unlock_irqrestore(&dd->lock, flags);
889 return ret;
890 }
891 backlog = crypto_get_backlog(&dd->queue);
892 areq = crypto_dequeue_request(&dd->queue);
893 if (areq)
894 dd->flags |= AES_FLAGS_BUSY;
895 spin_unlock_irqrestore(&dd->lock, flags);
896
897 if (!areq)
898 return ret;
899
900 if (backlog)
901 backlog->complete(backlog, -EINPROGRESS);
902
903 ctx = crypto_tfm_ctx(areq->tfm);
904
905 dd->areq = areq;
906 dd->ctx = ctx;
907 dd->is_async = (areq != new_areq);
908
909 err = ctx->start(dd);
910 return (dd->is_async) ? ret : err;
911 }
912
913
914 /* AES async block ciphers */
915
916 static int atmel_aes_transfer_complete(struct atmel_aes_dev *dd)
917 {
918 return atmel_aes_complete(dd, 0);
919 }
920
921 static int atmel_aes_start(struct atmel_aes_dev *dd)
922 {
923 struct ablkcipher_request *req = ablkcipher_request_cast(dd->areq);
924 struct atmel_aes_reqctx *rctx = ablkcipher_request_ctx(req);
925 bool use_dma = (req->nbytes >= ATMEL_AES_DMA_THRESHOLD ||
926 dd->ctx->block_size != AES_BLOCK_SIZE);
927 int err;
928
929 atmel_aes_set_mode(dd, rctx);
930
931 err = atmel_aes_hw_init(dd);
932 if (err)
933 return atmel_aes_complete(dd, err);
934
935 atmel_aes_write_ctrl(dd, use_dma, req->info);
936 if (use_dma)
937 return atmel_aes_dma_start(dd, req->src, req->dst, req->nbytes,
938 atmel_aes_transfer_complete);
939
940 return atmel_aes_cpu_start(dd, req->src, req->dst, req->nbytes,
941 atmel_aes_transfer_complete);
942 }
943
944 static inline struct atmel_aes_ctr_ctx *
945 atmel_aes_ctr_ctx_cast(struct atmel_aes_base_ctx *ctx)
946 {
947 return container_of(ctx, struct atmel_aes_ctr_ctx, base);
948 }
949
950 static int atmel_aes_ctr_transfer(struct atmel_aes_dev *dd)
951 {
952 struct atmel_aes_ctr_ctx *ctx = atmel_aes_ctr_ctx_cast(dd->ctx);
953 struct ablkcipher_request *req = ablkcipher_request_cast(dd->areq);
954 struct scatterlist *src, *dst;
955 u32 ctr, blocks;
956 size_t datalen;
957 bool use_dma, fragmented = false;
958
959 /* Check for transfer completion. */
960 ctx->offset += dd->total;
961 if (ctx->offset >= req->nbytes)
962 return atmel_aes_transfer_complete(dd);
963
964 /* Compute data length. */
965 datalen = req->nbytes - ctx->offset;
966 blocks = DIV_ROUND_UP(datalen, AES_BLOCK_SIZE);
967 ctr = be32_to_cpu(ctx->iv[3]);
968 if (dd->caps.has_ctr32) {
969 /* Check 32bit counter overflow. */
970 u32 start = ctr;
971 u32 end = start + blocks - 1;
972
973 if (end < start) {
974 ctr |= 0xffffffff;
975 datalen = AES_BLOCK_SIZE * -start;
976 fragmented = true;
977 }
978 } else {
979 /* Check 16bit counter overflow. */
980 u16 start = ctr & 0xffff;
981 u16 end = start + (u16)blocks - 1;
982
983 if (blocks >> 16 || end < start) {
984 ctr |= 0xffff;
985 datalen = AES_BLOCK_SIZE * (0x10000-start);
986 fragmented = true;
987 }
988 }
989 use_dma = (datalen >= ATMEL_AES_DMA_THRESHOLD);
990
991 /* Jump to offset. */
992 src = scatterwalk_ffwd(ctx->src, req->src, ctx->offset);
993 dst = ((req->src == req->dst) ? src :
994 scatterwalk_ffwd(ctx->dst, req->dst, ctx->offset));
995
996 /* Configure hardware. */
997 atmel_aes_write_ctrl(dd, use_dma, ctx->iv);
998 if (unlikely(fragmented)) {
999 /*
1000 * Increment the counter manually to cope with the hardware
1001 * counter overflow.
1002 */
1003 ctx->iv[3] = cpu_to_be32(ctr);
1004 crypto_inc((u8 *)ctx->iv, AES_BLOCK_SIZE);
1005 }
1006
1007 if (use_dma)
1008 return atmel_aes_dma_start(dd, src, dst, datalen,
1009 atmel_aes_ctr_transfer);
1010
1011 return atmel_aes_cpu_start(dd, src, dst, datalen,
1012 atmel_aes_ctr_transfer);
1013 }
1014
1015 static int atmel_aes_ctr_start(struct atmel_aes_dev *dd)
1016 {
1017 struct atmel_aes_ctr_ctx *ctx = atmel_aes_ctr_ctx_cast(dd->ctx);
1018 struct ablkcipher_request *req = ablkcipher_request_cast(dd->areq);
1019 struct atmel_aes_reqctx *rctx = ablkcipher_request_ctx(req);
1020 int err;
1021
1022 atmel_aes_set_mode(dd, rctx);
1023
1024 err = atmel_aes_hw_init(dd);
1025 if (err)
1026 return atmel_aes_complete(dd, err);
1027
1028 memcpy(ctx->iv, req->info, AES_BLOCK_SIZE);
1029 ctx->offset = 0;
1030 dd->total = 0;
1031 return atmel_aes_ctr_transfer(dd);
1032 }
1033
1034 static int atmel_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
1035 {
1036 struct atmel_aes_base_ctx *ctx;
1037 struct atmel_aes_reqctx *rctx;
1038 struct atmel_aes_dev *dd;
1039
1040 ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
1041 switch (mode & AES_FLAGS_OPMODE_MASK) {
1042 case AES_FLAGS_CFB8:
1043 ctx->block_size = CFB8_BLOCK_SIZE;
1044 break;
1045
1046 case AES_FLAGS_CFB16:
1047 ctx->block_size = CFB16_BLOCK_SIZE;
1048 break;
1049
1050 case AES_FLAGS_CFB32:
1051 ctx->block_size = CFB32_BLOCK_SIZE;
1052 break;
1053
1054 case AES_FLAGS_CFB64:
1055 ctx->block_size = CFB64_BLOCK_SIZE;
1056 break;
1057
1058 default:
1059 ctx->block_size = AES_BLOCK_SIZE;
1060 break;
1061 }
1062
1063 dd = atmel_aes_find_dev(ctx);
1064 if (!dd)
1065 return -ENODEV;
1066
1067 rctx = ablkcipher_request_ctx(req);
1068 rctx->mode = mode;
1069
1070 return atmel_aes_handle_queue(dd, &req->base);
1071 }
1072
1073 static int atmel_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
1074 unsigned int keylen)
1075 {
1076 struct atmel_aes_base_ctx *ctx = crypto_ablkcipher_ctx(tfm);
1077
1078 if (keylen != AES_KEYSIZE_128 &&
1079 keylen != AES_KEYSIZE_192 &&
1080 keylen != AES_KEYSIZE_256) {
1081 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
1082 return -EINVAL;
1083 }
1084
1085 memcpy(ctx->key, key, keylen);
1086 ctx->keylen = keylen;
1087
1088 return 0;
1089 }
1090
1091 static int atmel_aes_ecb_encrypt(struct ablkcipher_request *req)
1092 {
1093 return atmel_aes_crypt(req, AES_FLAGS_ECB | AES_FLAGS_ENCRYPT);
1094 }
1095
1096 static int atmel_aes_ecb_decrypt(struct ablkcipher_request *req)
1097 {
1098 return atmel_aes_crypt(req, AES_FLAGS_ECB);
1099 }
1100
1101 static int atmel_aes_cbc_encrypt(struct ablkcipher_request *req)
1102 {
1103 return atmel_aes_crypt(req, AES_FLAGS_CBC | AES_FLAGS_ENCRYPT);
1104 }
1105
1106 static int atmel_aes_cbc_decrypt(struct ablkcipher_request *req)
1107 {
1108 return atmel_aes_crypt(req, AES_FLAGS_CBC);
1109 }
1110
1111 static int atmel_aes_ofb_encrypt(struct ablkcipher_request *req)
1112 {
1113 return atmel_aes_crypt(req, AES_FLAGS_OFB | AES_FLAGS_ENCRYPT);
1114 }
1115
1116 static int atmel_aes_ofb_decrypt(struct ablkcipher_request *req)
1117 {
1118 return atmel_aes_crypt(req, AES_FLAGS_OFB);
1119 }
1120
1121 static int atmel_aes_cfb_encrypt(struct ablkcipher_request *req)
1122 {
1123 return atmel_aes_crypt(req, AES_FLAGS_CFB128 | AES_FLAGS_ENCRYPT);
1124 }
1125
1126 static int atmel_aes_cfb_decrypt(struct ablkcipher_request *req)
1127 {
1128 return atmel_aes_crypt(req, AES_FLAGS_CFB128);
1129 }
1130
1131 static int atmel_aes_cfb64_encrypt(struct ablkcipher_request *req)
1132 {
1133 return atmel_aes_crypt(req, AES_FLAGS_CFB64 | AES_FLAGS_ENCRYPT);
1134 }
1135
1136 static int atmel_aes_cfb64_decrypt(struct ablkcipher_request *req)
1137 {
1138 return atmel_aes_crypt(req, AES_FLAGS_CFB64);
1139 }
1140
1141 static int atmel_aes_cfb32_encrypt(struct ablkcipher_request *req)
1142 {
1143 return atmel_aes_crypt(req, AES_FLAGS_CFB32 | AES_FLAGS_ENCRYPT);
1144 }
1145
1146 static int atmel_aes_cfb32_decrypt(struct ablkcipher_request *req)
1147 {
1148 return atmel_aes_crypt(req, AES_FLAGS_CFB32);
1149 }
1150
1151 static int atmel_aes_cfb16_encrypt(struct ablkcipher_request *req)
1152 {
1153 return atmel_aes_crypt(req, AES_FLAGS_CFB16 | AES_FLAGS_ENCRYPT);
1154 }
1155
1156 static int atmel_aes_cfb16_decrypt(struct ablkcipher_request *req)
1157 {
1158 return atmel_aes_crypt(req, AES_FLAGS_CFB16);
1159 }
1160
1161 static int atmel_aes_cfb8_encrypt(struct ablkcipher_request *req)
1162 {
1163 return atmel_aes_crypt(req, AES_FLAGS_CFB8 | AES_FLAGS_ENCRYPT);
1164 }
1165
1166 static int atmel_aes_cfb8_decrypt(struct ablkcipher_request *req)
1167 {
1168 return atmel_aes_crypt(req, AES_FLAGS_CFB8);
1169 }
1170
1171 static int atmel_aes_ctr_encrypt(struct ablkcipher_request *req)
1172 {
1173 return atmel_aes_crypt(req, AES_FLAGS_CTR | AES_FLAGS_ENCRYPT);
1174 }
1175
1176 static int atmel_aes_ctr_decrypt(struct ablkcipher_request *req)
1177 {
1178 return atmel_aes_crypt(req, AES_FLAGS_CTR);
1179 }
1180
1181 static int atmel_aes_cra_init(struct crypto_tfm *tfm)
1182 {
1183 struct atmel_aes_ctx *ctx = crypto_tfm_ctx(tfm);
1184
1185 tfm->crt_ablkcipher.reqsize = sizeof(struct atmel_aes_reqctx);
1186 ctx->base.start = atmel_aes_start;
1187
1188 return 0;
1189 }
1190
1191 static int atmel_aes_ctr_cra_init(struct crypto_tfm *tfm)
1192 {
1193 struct atmel_aes_ctx *ctx = crypto_tfm_ctx(tfm);
1194
1195 tfm->crt_ablkcipher.reqsize = sizeof(struct atmel_aes_reqctx);
1196 ctx->base.start = atmel_aes_ctr_start;
1197
1198 return 0;
1199 }
1200
1201 static void atmel_aes_cra_exit(struct crypto_tfm *tfm)
1202 {
1203 }
1204
1205 static struct crypto_alg aes_algs[] = {
1206 {
1207 .cra_name = "ecb(aes)",
1208 .cra_driver_name = "atmel-ecb-aes",
1209 .cra_priority = ATMEL_AES_PRIORITY,
1210 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1211 .cra_blocksize = AES_BLOCK_SIZE,
1212 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1213 .cra_alignmask = 0xf,
1214 .cra_type = &crypto_ablkcipher_type,
1215 .cra_module = THIS_MODULE,
1216 .cra_init = atmel_aes_cra_init,
1217 .cra_exit = atmel_aes_cra_exit,
1218 .cra_u.ablkcipher = {
1219 .min_keysize = AES_MIN_KEY_SIZE,
1220 .max_keysize = AES_MAX_KEY_SIZE,
1221 .setkey = atmel_aes_setkey,
1222 .encrypt = atmel_aes_ecb_encrypt,
1223 .decrypt = atmel_aes_ecb_decrypt,
1224 }
1225 },
1226 {
1227 .cra_name = "cbc(aes)",
1228 .cra_driver_name = "atmel-cbc-aes",
1229 .cra_priority = ATMEL_AES_PRIORITY,
1230 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1231 .cra_blocksize = AES_BLOCK_SIZE,
1232 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1233 .cra_alignmask = 0xf,
1234 .cra_type = &crypto_ablkcipher_type,
1235 .cra_module = THIS_MODULE,
1236 .cra_init = atmel_aes_cra_init,
1237 .cra_exit = atmel_aes_cra_exit,
1238 .cra_u.ablkcipher = {
1239 .min_keysize = AES_MIN_KEY_SIZE,
1240 .max_keysize = AES_MAX_KEY_SIZE,
1241 .ivsize = AES_BLOCK_SIZE,
1242 .setkey = atmel_aes_setkey,
1243 .encrypt = atmel_aes_cbc_encrypt,
1244 .decrypt = atmel_aes_cbc_decrypt,
1245 }
1246 },
1247 {
1248 .cra_name = "ofb(aes)",
1249 .cra_driver_name = "atmel-ofb-aes",
1250 .cra_priority = ATMEL_AES_PRIORITY,
1251 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1252 .cra_blocksize = AES_BLOCK_SIZE,
1253 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1254 .cra_alignmask = 0xf,
1255 .cra_type = &crypto_ablkcipher_type,
1256 .cra_module = THIS_MODULE,
1257 .cra_init = atmel_aes_cra_init,
1258 .cra_exit = atmel_aes_cra_exit,
1259 .cra_u.ablkcipher = {
1260 .min_keysize = AES_MIN_KEY_SIZE,
1261 .max_keysize = AES_MAX_KEY_SIZE,
1262 .ivsize = AES_BLOCK_SIZE,
1263 .setkey = atmel_aes_setkey,
1264 .encrypt = atmel_aes_ofb_encrypt,
1265 .decrypt = atmel_aes_ofb_decrypt,
1266 }
1267 },
1268 {
1269 .cra_name = "cfb(aes)",
1270 .cra_driver_name = "atmel-cfb-aes",
1271 .cra_priority = ATMEL_AES_PRIORITY,
1272 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1273 .cra_blocksize = AES_BLOCK_SIZE,
1274 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1275 .cra_alignmask = 0xf,
1276 .cra_type = &crypto_ablkcipher_type,
1277 .cra_module = THIS_MODULE,
1278 .cra_init = atmel_aes_cra_init,
1279 .cra_exit = atmel_aes_cra_exit,
1280 .cra_u.ablkcipher = {
1281 .min_keysize = AES_MIN_KEY_SIZE,
1282 .max_keysize = AES_MAX_KEY_SIZE,
1283 .ivsize = AES_BLOCK_SIZE,
1284 .setkey = atmel_aes_setkey,
1285 .encrypt = atmel_aes_cfb_encrypt,
1286 .decrypt = atmel_aes_cfb_decrypt,
1287 }
1288 },
1289 {
1290 .cra_name = "cfb32(aes)",
1291 .cra_driver_name = "atmel-cfb32-aes",
1292 .cra_priority = ATMEL_AES_PRIORITY,
1293 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1294 .cra_blocksize = CFB32_BLOCK_SIZE,
1295 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1296 .cra_alignmask = 0x3,
1297 .cra_type = &crypto_ablkcipher_type,
1298 .cra_module = THIS_MODULE,
1299 .cra_init = atmel_aes_cra_init,
1300 .cra_exit = atmel_aes_cra_exit,
1301 .cra_u.ablkcipher = {
1302 .min_keysize = AES_MIN_KEY_SIZE,
1303 .max_keysize = AES_MAX_KEY_SIZE,
1304 .ivsize = AES_BLOCK_SIZE,
1305 .setkey = atmel_aes_setkey,
1306 .encrypt = atmel_aes_cfb32_encrypt,
1307 .decrypt = atmel_aes_cfb32_decrypt,
1308 }
1309 },
1310 {
1311 .cra_name = "cfb16(aes)",
1312 .cra_driver_name = "atmel-cfb16-aes",
1313 .cra_priority = ATMEL_AES_PRIORITY,
1314 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1315 .cra_blocksize = CFB16_BLOCK_SIZE,
1316 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1317 .cra_alignmask = 0x1,
1318 .cra_type = &crypto_ablkcipher_type,
1319 .cra_module = THIS_MODULE,
1320 .cra_init = atmel_aes_cra_init,
1321 .cra_exit = atmel_aes_cra_exit,
1322 .cra_u.ablkcipher = {
1323 .min_keysize = AES_MIN_KEY_SIZE,
1324 .max_keysize = AES_MAX_KEY_SIZE,
1325 .ivsize = AES_BLOCK_SIZE,
1326 .setkey = atmel_aes_setkey,
1327 .encrypt = atmel_aes_cfb16_encrypt,
1328 .decrypt = atmel_aes_cfb16_decrypt,
1329 }
1330 },
1331 {
1332 .cra_name = "cfb8(aes)",
1333 .cra_driver_name = "atmel-cfb8-aes",
1334 .cra_priority = ATMEL_AES_PRIORITY,
1335 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1336 .cra_blocksize = CFB8_BLOCK_SIZE,
1337 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1338 .cra_alignmask = 0x0,
1339 .cra_type = &crypto_ablkcipher_type,
1340 .cra_module = THIS_MODULE,
1341 .cra_init = atmel_aes_cra_init,
1342 .cra_exit = atmel_aes_cra_exit,
1343 .cra_u.ablkcipher = {
1344 .min_keysize = AES_MIN_KEY_SIZE,
1345 .max_keysize = AES_MAX_KEY_SIZE,
1346 .ivsize = AES_BLOCK_SIZE,
1347 .setkey = atmel_aes_setkey,
1348 .encrypt = atmel_aes_cfb8_encrypt,
1349 .decrypt = atmel_aes_cfb8_decrypt,
1350 }
1351 },
1352 {
1353 .cra_name = "ctr(aes)",
1354 .cra_driver_name = "atmel-ctr-aes",
1355 .cra_priority = ATMEL_AES_PRIORITY,
1356 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1357 .cra_blocksize = 1,
1358 .cra_ctxsize = sizeof(struct atmel_aes_ctr_ctx),
1359 .cra_alignmask = 0xf,
1360 .cra_type = &crypto_ablkcipher_type,
1361 .cra_module = THIS_MODULE,
1362 .cra_init = atmel_aes_ctr_cra_init,
1363 .cra_exit = atmel_aes_cra_exit,
1364 .cra_u.ablkcipher = {
1365 .min_keysize = AES_MIN_KEY_SIZE,
1366 .max_keysize = AES_MAX_KEY_SIZE,
1367 .ivsize = AES_BLOCK_SIZE,
1368 .setkey = atmel_aes_setkey,
1369 .encrypt = atmel_aes_ctr_encrypt,
1370 .decrypt = atmel_aes_ctr_decrypt,
1371 }
1372 },
1373 };
1374
1375 static struct crypto_alg aes_cfb64_alg = {
1376 .cra_name = "cfb64(aes)",
1377 .cra_driver_name = "atmel-cfb64-aes",
1378 .cra_priority = ATMEL_AES_PRIORITY,
1379 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1380 .cra_blocksize = CFB64_BLOCK_SIZE,
1381 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1382 .cra_alignmask = 0x7,
1383 .cra_type = &crypto_ablkcipher_type,
1384 .cra_module = THIS_MODULE,
1385 .cra_init = atmel_aes_cra_init,
1386 .cra_exit = atmel_aes_cra_exit,
1387 .cra_u.ablkcipher = {
1388 .min_keysize = AES_MIN_KEY_SIZE,
1389 .max_keysize = AES_MAX_KEY_SIZE,
1390 .ivsize = AES_BLOCK_SIZE,
1391 .setkey = atmel_aes_setkey,
1392 .encrypt = atmel_aes_cfb64_encrypt,
1393 .decrypt = atmel_aes_cfb64_decrypt,
1394 }
1395 };
1396
1397
1398 /* gcm aead functions */
1399
1400 static int atmel_aes_gcm_ghash(struct atmel_aes_dev *dd,
1401 const u32 *data, size_t datalen,
1402 const u32 *ghash_in, u32 *ghash_out,
1403 atmel_aes_fn_t resume);
1404 static int atmel_aes_gcm_ghash_init(struct atmel_aes_dev *dd);
1405 static int atmel_aes_gcm_ghash_finalize(struct atmel_aes_dev *dd);
1406
1407 static int atmel_aes_gcm_start(struct atmel_aes_dev *dd);
1408 static int atmel_aes_gcm_process(struct atmel_aes_dev *dd);
1409 static int atmel_aes_gcm_length(struct atmel_aes_dev *dd);
1410 static int atmel_aes_gcm_data(struct atmel_aes_dev *dd);
1411 static int atmel_aes_gcm_tag_init(struct atmel_aes_dev *dd);
1412 static int atmel_aes_gcm_tag(struct atmel_aes_dev *dd);
1413 static int atmel_aes_gcm_finalize(struct atmel_aes_dev *dd);
1414
1415 static inline struct atmel_aes_gcm_ctx *
1416 atmel_aes_gcm_ctx_cast(struct atmel_aes_base_ctx *ctx)
1417 {
1418 return container_of(ctx, struct atmel_aes_gcm_ctx, base);
1419 }
1420
1421 static int atmel_aes_gcm_ghash(struct atmel_aes_dev *dd,
1422 const u32 *data, size_t datalen,
1423 const u32 *ghash_in, u32 *ghash_out,
1424 atmel_aes_fn_t resume)
1425 {
1426 struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
1427
1428 dd->data = (u32 *)data;
1429 dd->datalen = datalen;
1430 ctx->ghash_in = ghash_in;
1431 ctx->ghash_out = ghash_out;
1432 ctx->ghash_resume = resume;
1433
1434 atmel_aes_write_ctrl(dd, false, NULL);
1435 return atmel_aes_wait_for_data_ready(dd, atmel_aes_gcm_ghash_init);
1436 }
1437
1438 static int atmel_aes_gcm_ghash_init(struct atmel_aes_dev *dd)
1439 {
1440 struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
1441
1442 /* Set the data length. */
1443 atmel_aes_write(dd, AES_AADLENR, dd->total);
1444 atmel_aes_write(dd, AES_CLENR, 0);
1445
1446 /* If needed, overwrite the GCM Intermediate Hash Word Registers */
1447 if (ctx->ghash_in)
1448 atmel_aes_write_block(dd, AES_GHASHR(0), ctx->ghash_in);
1449
1450 return atmel_aes_gcm_ghash_finalize(dd);
1451 }
1452
1453 static int atmel_aes_gcm_ghash_finalize(struct atmel_aes_dev *dd)
1454 {
1455 struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
1456 u32 isr;
1457
1458 /* Write data into the Input Data Registers. */
1459 while (dd->datalen > 0) {
1460 atmel_aes_write_block(dd, AES_IDATAR(0), dd->data);
1461 dd->data += 4;
1462 dd->datalen -= AES_BLOCK_SIZE;
1463
1464 isr = atmel_aes_read(dd, AES_ISR);
1465 if (!(isr & AES_INT_DATARDY)) {
1466 dd->resume = atmel_aes_gcm_ghash_finalize;
1467 atmel_aes_write(dd, AES_IER, AES_INT_DATARDY);
1468 return -EINPROGRESS;
1469 }
1470 }
1471
1472 /* Read the computed hash from GHASHRx. */
1473 atmel_aes_read_block(dd, AES_GHASHR(0), ctx->ghash_out);
1474
1475 return ctx->ghash_resume(dd);
1476 }
1477
1478
1479 static int atmel_aes_gcm_start(struct atmel_aes_dev *dd)
1480 {
1481 struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
1482 struct aead_request *req = aead_request_cast(dd->areq);
1483 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
1484 struct atmel_aes_reqctx *rctx = aead_request_ctx(req);
1485 size_t ivsize = crypto_aead_ivsize(tfm);
1486 size_t datalen, padlen;
1487 const void *iv = req->iv;
1488 u8 *data = dd->buf;
1489 int err;
1490
1491 atmel_aes_set_mode(dd, rctx);
1492
1493 err = atmel_aes_hw_init(dd);
1494 if (err)
1495 return atmel_aes_complete(dd, err);
1496
1497 if (likely(ivsize == 12)) {
1498 memcpy(ctx->j0, iv, ivsize);
1499 ctx->j0[3] = cpu_to_be32(1);
1500 return atmel_aes_gcm_process(dd);
1501 }
1502
1503 padlen = atmel_aes_padlen(ivsize, AES_BLOCK_SIZE);
1504 datalen = ivsize + padlen + AES_BLOCK_SIZE;
1505 if (datalen > dd->buflen)
1506 return atmel_aes_complete(dd, -EINVAL);
1507
1508 memcpy(data, iv, ivsize);
1509 memset(data + ivsize, 0, padlen + sizeof(u64));
1510 ((u64 *)(data + datalen))[-1] = cpu_to_be64(ivsize * 8);
1511
1512 return atmel_aes_gcm_ghash(dd, (const u32 *)data, datalen,
1513 NULL, ctx->j0, atmel_aes_gcm_process);
1514 }
1515
1516 static int atmel_aes_gcm_process(struct atmel_aes_dev *dd)
1517 {
1518 struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
1519 struct aead_request *req = aead_request_cast(dd->areq);
1520 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
1521 bool enc = atmel_aes_is_encrypt(dd);
1522 u32 authsize;
1523
1524 /* Compute text length. */
1525 authsize = crypto_aead_authsize(tfm);
1526 ctx->textlen = req->cryptlen - (enc ? 0 : authsize);
1527
1528 /*
1529 * According to tcrypt test suite, the GCM Automatic Tag Generation
1530 * fails when both the message and its associated data are empty.
1531 */
1532 if (likely(req->assoclen != 0 || ctx->textlen != 0))
1533 dd->flags |= AES_FLAGS_GTAGEN;
1534
1535 atmel_aes_write_ctrl(dd, false, NULL);
1536 return atmel_aes_wait_for_data_ready(dd, atmel_aes_gcm_length);
1537 }
1538
1539 static int atmel_aes_gcm_length(struct atmel_aes_dev *dd)
1540 {
1541 struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
1542 struct aead_request *req = aead_request_cast(dd->areq);
1543 u32 j0_lsw, *j0 = ctx->j0;
1544 size_t padlen;
1545
1546 /* Write incr32(J0) into IV. */
1547 j0_lsw = j0[3];
1548 j0[3] = cpu_to_be32(be32_to_cpu(j0[3]) + 1);
1549 atmel_aes_write_block(dd, AES_IVR(0), j0);
1550 j0[3] = j0_lsw;
1551
1552 /* Set aad and text lengths. */
1553 atmel_aes_write(dd, AES_AADLENR, req->assoclen);
1554 atmel_aes_write(dd, AES_CLENR, ctx->textlen);
1555
1556 /* Check whether AAD are present. */
1557 if (unlikely(req->assoclen == 0)) {
1558 dd->datalen = 0;
1559 return atmel_aes_gcm_data(dd);
1560 }
1561
1562 /* Copy assoc data and add padding. */
1563 padlen = atmel_aes_padlen(req->assoclen, AES_BLOCK_SIZE);
1564 if (unlikely(req->assoclen + padlen > dd->buflen))
1565 return atmel_aes_complete(dd, -EINVAL);
1566 sg_copy_to_buffer(req->src, sg_nents(req->src), dd->buf, req->assoclen);
1567
1568 /* Write assoc data into the Input Data register. */
1569 dd->data = (u32 *)dd->buf;
1570 dd->datalen = req->assoclen + padlen;
1571 return atmel_aes_gcm_data(dd);
1572 }
1573
1574 static int atmel_aes_gcm_data(struct atmel_aes_dev *dd)
1575 {
1576 struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
1577 struct aead_request *req = aead_request_cast(dd->areq);
1578 bool use_dma = (ctx->textlen >= ATMEL_AES_DMA_THRESHOLD);
1579 struct scatterlist *src, *dst;
1580 u32 isr, mr;
1581
1582 /* Write AAD first. */
1583 while (dd->datalen > 0) {
1584 atmel_aes_write_block(dd, AES_IDATAR(0), dd->data);
1585 dd->data += 4;
1586 dd->datalen -= AES_BLOCK_SIZE;
1587
1588 isr = atmel_aes_read(dd, AES_ISR);
1589 if (!(isr & AES_INT_DATARDY)) {
1590 dd->resume = atmel_aes_gcm_data;
1591 atmel_aes_write(dd, AES_IER, AES_INT_DATARDY);
1592 return -EINPROGRESS;
1593 }
1594 }
1595
1596 /* GMAC only. */
1597 if (unlikely(ctx->textlen == 0))
1598 return atmel_aes_gcm_tag_init(dd);
1599
1600 /* Prepare src and dst scatter lists to transfer cipher/plain texts */
1601 src = scatterwalk_ffwd(ctx->src, req->src, req->assoclen);
1602 dst = ((req->src == req->dst) ? src :
1603 scatterwalk_ffwd(ctx->dst, req->dst, req->assoclen));
1604
1605 if (use_dma) {
1606 /* Update the Mode Register for DMA transfers. */
1607 mr = atmel_aes_read(dd, AES_MR);
1608 mr &= ~(AES_MR_SMOD_MASK | AES_MR_DUALBUFF);
1609 mr |= AES_MR_SMOD_IDATAR0;
1610 if (dd->caps.has_dualbuff)
1611 mr |= AES_MR_DUALBUFF;
1612 atmel_aes_write(dd, AES_MR, mr);
1613
1614 return atmel_aes_dma_start(dd, src, dst, ctx->textlen,
1615 atmel_aes_gcm_tag_init);
1616 }
1617
1618 return atmel_aes_cpu_start(dd, src, dst, ctx->textlen,
1619 atmel_aes_gcm_tag_init);
1620 }
1621
1622 static int atmel_aes_gcm_tag_init(struct atmel_aes_dev *dd)
1623 {
1624 struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
1625 struct aead_request *req = aead_request_cast(dd->areq);
1626 u64 *data = dd->buf;
1627
1628 if (likely(dd->flags & AES_FLAGS_GTAGEN)) {
1629 if (!(atmel_aes_read(dd, AES_ISR) & AES_INT_TAGRDY)) {
1630 dd->resume = atmel_aes_gcm_tag_init;
1631 atmel_aes_write(dd, AES_IER, AES_INT_TAGRDY);
1632 return -EINPROGRESS;
1633 }
1634
1635 return atmel_aes_gcm_finalize(dd);
1636 }
1637
1638 /* Read the GCM Intermediate Hash Word Registers. */
1639 atmel_aes_read_block(dd, AES_GHASHR(0), ctx->ghash);
1640
1641 data[0] = cpu_to_be64(req->assoclen * 8);
1642 data[1] = cpu_to_be64(ctx->textlen * 8);
1643
1644 return atmel_aes_gcm_ghash(dd, (const u32 *)data, AES_BLOCK_SIZE,
1645 ctx->ghash, ctx->ghash, atmel_aes_gcm_tag);
1646 }
1647
1648 static int atmel_aes_gcm_tag(struct atmel_aes_dev *dd)
1649 {
1650 struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
1651 unsigned long flags;
1652
1653 /*
1654 * Change mode to CTR to complete the tag generation.
1655 * Use J0 as Initialization Vector.
1656 */
1657 flags = dd->flags;
1658 dd->flags &= ~(AES_FLAGS_OPMODE_MASK | AES_FLAGS_GTAGEN);
1659 dd->flags |= AES_FLAGS_CTR;
1660 atmel_aes_write_ctrl(dd, false, ctx->j0);
1661 dd->flags = flags;
1662
1663 atmel_aes_write_block(dd, AES_IDATAR(0), ctx->ghash);
1664 return atmel_aes_wait_for_data_ready(dd, atmel_aes_gcm_finalize);
1665 }
1666
1667 static int atmel_aes_gcm_finalize(struct atmel_aes_dev *dd)
1668 {
1669 struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
1670 struct aead_request *req = aead_request_cast(dd->areq);
1671 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
1672 bool enc = atmel_aes_is_encrypt(dd);
1673 u32 offset, authsize, itag[4], *otag = ctx->tag;
1674 int err;
1675
1676 /* Read the computed tag. */
1677 if (likely(dd->flags & AES_FLAGS_GTAGEN))
1678 atmel_aes_read_block(dd, AES_TAGR(0), ctx->tag);
1679 else
1680 atmel_aes_read_block(dd, AES_ODATAR(0), ctx->tag);
1681
1682 offset = req->assoclen + ctx->textlen;
1683 authsize = crypto_aead_authsize(tfm);
1684 if (enc) {
1685 scatterwalk_map_and_copy(otag, req->dst, offset, authsize, 1);
1686 err = 0;
1687 } else {
1688 scatterwalk_map_and_copy(itag, req->src, offset, authsize, 0);
1689 err = crypto_memneq(itag, otag, authsize) ? -EBADMSG : 0;
1690 }
1691
1692 return atmel_aes_complete(dd, err);
1693 }
1694
1695 static int atmel_aes_gcm_crypt(struct aead_request *req,
1696 unsigned long mode)
1697 {
1698 struct atmel_aes_base_ctx *ctx;
1699 struct atmel_aes_reqctx *rctx;
1700 struct atmel_aes_dev *dd;
1701
1702 ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
1703 ctx->block_size = AES_BLOCK_SIZE;
1704
1705 dd = atmel_aes_find_dev(ctx);
1706 if (!dd)
1707 return -ENODEV;
1708
1709 rctx = aead_request_ctx(req);
1710 rctx->mode = AES_FLAGS_GCM | mode;
1711
1712 return atmel_aes_handle_queue(dd, &req->base);
1713 }
1714
1715 static int atmel_aes_gcm_setkey(struct crypto_aead *tfm, const u8 *key,
1716 unsigned int keylen)
1717 {
1718 struct atmel_aes_base_ctx *ctx = crypto_aead_ctx(tfm);
1719
1720 if (keylen != AES_KEYSIZE_256 &&
1721 keylen != AES_KEYSIZE_192 &&
1722 keylen != AES_KEYSIZE_128) {
1723 crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
1724 return -EINVAL;
1725 }
1726
1727 memcpy(ctx->key, key, keylen);
1728 ctx->keylen = keylen;
1729
1730 return 0;
1731 }
1732
1733 static int atmel_aes_gcm_setauthsize(struct crypto_aead *tfm,
1734 unsigned int authsize)
1735 {
1736 /* Same as crypto_gcm_authsize() from crypto/gcm.c */
1737 switch (authsize) {
1738 case 4:
1739 case 8:
1740 case 12:
1741 case 13:
1742 case 14:
1743 case 15:
1744 case 16:
1745 break;
1746 default:
1747 return -EINVAL;
1748 }
1749
1750 return 0;
1751 }
1752
1753 static int atmel_aes_gcm_encrypt(struct aead_request *req)
1754 {
1755 return atmel_aes_gcm_crypt(req, AES_FLAGS_ENCRYPT);
1756 }
1757
1758 static int atmel_aes_gcm_decrypt(struct aead_request *req)
1759 {
1760 return atmel_aes_gcm_crypt(req, 0);
1761 }
1762
1763 static int atmel_aes_gcm_init(struct crypto_aead *tfm)
1764 {
1765 struct atmel_aes_gcm_ctx *ctx = crypto_aead_ctx(tfm);
1766
1767 crypto_aead_set_reqsize(tfm, sizeof(struct atmel_aes_reqctx));
1768 ctx->base.start = atmel_aes_gcm_start;
1769
1770 return 0;
1771 }
1772
1773 static void atmel_aes_gcm_exit(struct crypto_aead *tfm)
1774 {
1775
1776 }
1777
1778 static struct aead_alg aes_gcm_alg = {
1779 .setkey = atmel_aes_gcm_setkey,
1780 .setauthsize = atmel_aes_gcm_setauthsize,
1781 .encrypt = atmel_aes_gcm_encrypt,
1782 .decrypt = atmel_aes_gcm_decrypt,
1783 .init = atmel_aes_gcm_init,
1784 .exit = atmel_aes_gcm_exit,
1785 .ivsize = 12,
1786 .maxauthsize = AES_BLOCK_SIZE,
1787
1788 .base = {
1789 .cra_name = "gcm(aes)",
1790 .cra_driver_name = "atmel-gcm-aes",
1791 .cra_priority = ATMEL_AES_PRIORITY,
1792 .cra_flags = CRYPTO_ALG_ASYNC,
1793 .cra_blocksize = 1,
1794 .cra_ctxsize = sizeof(struct atmel_aes_gcm_ctx),
1795 .cra_alignmask = 0xf,
1796 .cra_module = THIS_MODULE,
1797 },
1798 };
1799
1800
1801 /* xts functions */
1802
1803 static inline struct atmel_aes_xts_ctx *
1804 atmel_aes_xts_ctx_cast(struct atmel_aes_base_ctx *ctx)
1805 {
1806 return container_of(ctx, struct atmel_aes_xts_ctx, base);
1807 }
1808
1809 static int atmel_aes_xts_process_data(struct atmel_aes_dev *dd);
1810
1811 static int atmel_aes_xts_start(struct atmel_aes_dev *dd)
1812 {
1813 struct atmel_aes_xts_ctx *ctx = atmel_aes_xts_ctx_cast(dd->ctx);
1814 struct ablkcipher_request *req = ablkcipher_request_cast(dd->areq);
1815 struct atmel_aes_reqctx *rctx = ablkcipher_request_ctx(req);
1816 unsigned long flags;
1817 int err;
1818
1819 atmel_aes_set_mode(dd, rctx);
1820
1821 err = atmel_aes_hw_init(dd);
1822 if (err)
1823 return atmel_aes_complete(dd, err);
1824
1825 /* Compute the tweak value from req->info with ecb(aes). */
1826 flags = dd->flags;
1827 dd->flags &= ~AES_FLAGS_MODE_MASK;
1828 dd->flags |= (AES_FLAGS_ECB | AES_FLAGS_ENCRYPT);
1829 atmel_aes_write_ctrl_key(dd, false, NULL,
1830 ctx->key2, ctx->base.keylen);
1831 dd->flags = flags;
1832
1833 atmel_aes_write_block(dd, AES_IDATAR(0), req->info);
1834 return atmel_aes_wait_for_data_ready(dd, atmel_aes_xts_process_data);
1835 }
1836
1837 static int atmel_aes_xts_process_data(struct atmel_aes_dev *dd)
1838 {
1839 struct ablkcipher_request *req = ablkcipher_request_cast(dd->areq);
1840 bool use_dma = (req->nbytes >= ATMEL_AES_DMA_THRESHOLD);
1841 u32 tweak[AES_BLOCK_SIZE / sizeof(u32)];
1842 static const u32 one[AES_BLOCK_SIZE / sizeof(u32)] = {cpu_to_le32(1), };
1843 u8 *tweak_bytes = (u8 *)tweak;
1844 int i;
1845
1846 /* Read the computed ciphered tweak value. */
1847 atmel_aes_read_block(dd, AES_ODATAR(0), tweak);
1848 /*
1849 * Hardware quirk:
1850 * the order of the ciphered tweak bytes need to be reversed before
1851 * writing them into the ODATARx registers.
1852 */
1853 for (i = 0; i < AES_BLOCK_SIZE/2; ++i) {
1854 u8 tmp = tweak_bytes[AES_BLOCK_SIZE - 1 - i];
1855
1856 tweak_bytes[AES_BLOCK_SIZE - 1 - i] = tweak_bytes[i];
1857 tweak_bytes[i] = tmp;
1858 }
1859
1860 /* Process the data. */
1861 atmel_aes_write_ctrl(dd, use_dma, NULL);
1862 atmel_aes_write_block(dd, AES_TWR(0), tweak);
1863 atmel_aes_write_block(dd, AES_ALPHAR(0), one);
1864 if (use_dma)
1865 return atmel_aes_dma_start(dd, req->src, req->dst, req->nbytes,
1866 atmel_aes_transfer_complete);
1867
1868 return atmel_aes_cpu_start(dd, req->src, req->dst, req->nbytes,
1869 atmel_aes_transfer_complete);
1870 }
1871
1872 static int atmel_aes_xts_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
1873 unsigned int keylen)
1874 {
1875 struct atmel_aes_xts_ctx *ctx = crypto_ablkcipher_ctx(tfm);
1876 int err;
1877
1878 err = xts_check_key(crypto_ablkcipher_tfm(tfm), key, keylen);
1879 if (err)
1880 return err;
1881
1882 memcpy(ctx->base.key, key, keylen/2);
1883 memcpy(ctx->key2, key + keylen/2, keylen/2);
1884 ctx->base.keylen = keylen/2;
1885
1886 return 0;
1887 }
1888
1889 static int atmel_aes_xts_encrypt(struct ablkcipher_request *req)
1890 {
1891 return atmel_aes_crypt(req, AES_FLAGS_XTS | AES_FLAGS_ENCRYPT);
1892 }
1893
1894 static int atmel_aes_xts_decrypt(struct ablkcipher_request *req)
1895 {
1896 return atmel_aes_crypt(req, AES_FLAGS_XTS);
1897 }
1898
1899 static int atmel_aes_xts_cra_init(struct crypto_tfm *tfm)
1900 {
1901 struct atmel_aes_xts_ctx *ctx = crypto_tfm_ctx(tfm);
1902
1903 tfm->crt_ablkcipher.reqsize = sizeof(struct atmel_aes_reqctx);
1904 ctx->base.start = atmel_aes_xts_start;
1905
1906 return 0;
1907 }
1908
1909 static struct crypto_alg aes_xts_alg = {
1910 .cra_name = "xts(aes)",
1911 .cra_driver_name = "atmel-xts-aes",
1912 .cra_priority = ATMEL_AES_PRIORITY,
1913 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1914 .cra_blocksize = AES_BLOCK_SIZE,
1915 .cra_ctxsize = sizeof(struct atmel_aes_xts_ctx),
1916 .cra_alignmask = 0xf,
1917 .cra_type = &crypto_ablkcipher_type,
1918 .cra_module = THIS_MODULE,
1919 .cra_init = atmel_aes_xts_cra_init,
1920 .cra_exit = atmel_aes_cra_exit,
1921 .cra_u.ablkcipher = {
1922 .min_keysize = 2 * AES_MIN_KEY_SIZE,
1923 .max_keysize = 2 * AES_MAX_KEY_SIZE,
1924 .ivsize = AES_BLOCK_SIZE,
1925 .setkey = atmel_aes_xts_setkey,
1926 .encrypt = atmel_aes_xts_encrypt,
1927 .decrypt = atmel_aes_xts_decrypt,
1928 }
1929 };
1930
1931
1932 /* Probe functions */
1933
1934 static int atmel_aes_buff_init(struct atmel_aes_dev *dd)
1935 {
1936 dd->buf = (void *)__get_free_pages(GFP_KERNEL, ATMEL_AES_BUFFER_ORDER);
1937 dd->buflen = ATMEL_AES_BUFFER_SIZE;
1938 dd->buflen &= ~(AES_BLOCK_SIZE - 1);
1939
1940 if (!dd->buf) {
1941 dev_err(dd->dev, "unable to alloc pages.\n");
1942 return -ENOMEM;
1943 }
1944
1945 return 0;
1946 }
1947
1948 static void atmel_aes_buff_cleanup(struct atmel_aes_dev *dd)
1949 {
1950 free_page((unsigned long)dd->buf);
1951 }
1952
1953 static bool atmel_aes_filter(struct dma_chan *chan, void *slave)
1954 {
1955 struct at_dma_slave *sl = slave;
1956
1957 if (sl && sl->dma_dev == chan->device->dev) {
1958 chan->private = sl;
1959 return true;
1960 } else {
1961 return false;
1962 }
1963 }
1964
1965 static int atmel_aes_dma_init(struct atmel_aes_dev *dd,
1966 struct crypto_platform_data *pdata)
1967 {
1968 struct at_dma_slave *slave;
1969 int err = -ENOMEM;
1970 dma_cap_mask_t mask;
1971
1972 dma_cap_zero(mask);
1973 dma_cap_set(DMA_SLAVE, mask);
1974
1975 /* Try to grab 2 DMA channels */
1976 slave = &pdata->dma_slave->rxdata;
1977 dd->src.chan = dma_request_slave_channel_compat(mask, atmel_aes_filter,
1978 slave, dd->dev, "tx");
1979 if (!dd->src.chan)
1980 goto err_dma_in;
1981
1982 slave = &pdata->dma_slave->txdata;
1983 dd->dst.chan = dma_request_slave_channel_compat(mask, atmel_aes_filter,
1984 slave, dd->dev, "rx");
1985 if (!dd->dst.chan)
1986 goto err_dma_out;
1987
1988 return 0;
1989
1990 err_dma_out:
1991 dma_release_channel(dd->src.chan);
1992 err_dma_in:
1993 dev_warn(dd->dev, "no DMA channel available\n");
1994 return err;
1995 }
1996
1997 static void atmel_aes_dma_cleanup(struct atmel_aes_dev *dd)
1998 {
1999 dma_release_channel(dd->dst.chan);
2000 dma_release_channel(dd->src.chan);
2001 }
2002
2003 static void atmel_aes_queue_task(unsigned long data)
2004 {
2005 struct atmel_aes_dev *dd = (struct atmel_aes_dev *)data;
2006
2007 atmel_aes_handle_queue(dd, NULL);
2008 }
2009
2010 static void atmel_aes_done_task(unsigned long data)
2011 {
2012 struct atmel_aes_dev *dd = (struct atmel_aes_dev *)data;
2013
2014 dd->is_async = true;
2015 (void)dd->resume(dd);
2016 }
2017
2018 static irqreturn_t atmel_aes_irq(int irq, void *dev_id)
2019 {
2020 struct atmel_aes_dev *aes_dd = dev_id;
2021 u32 reg;
2022
2023 reg = atmel_aes_read(aes_dd, AES_ISR);
2024 if (reg & atmel_aes_read(aes_dd, AES_IMR)) {
2025 atmel_aes_write(aes_dd, AES_IDR, reg);
2026 if (AES_FLAGS_BUSY & aes_dd->flags)
2027 tasklet_schedule(&aes_dd->done_task);
2028 else
2029 dev_warn(aes_dd->dev, "AES interrupt when no active requests.\n");
2030 return IRQ_HANDLED;
2031 }
2032
2033 return IRQ_NONE;
2034 }
2035
2036 static void atmel_aes_unregister_algs(struct atmel_aes_dev *dd)
2037 {
2038 int i;
2039
2040 if (dd->caps.has_xts)
2041 crypto_unregister_alg(&aes_xts_alg);
2042
2043 if (dd->caps.has_gcm)
2044 crypto_unregister_aead(&aes_gcm_alg);
2045
2046 if (dd->caps.has_cfb64)
2047 crypto_unregister_alg(&aes_cfb64_alg);
2048
2049 for (i = 0; i < ARRAY_SIZE(aes_algs); i++)
2050 crypto_unregister_alg(&aes_algs[i]);
2051 }
2052
2053 static int atmel_aes_register_algs(struct atmel_aes_dev *dd)
2054 {
2055 int err, i, j;
2056
2057 for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
2058 err = crypto_register_alg(&aes_algs[i]);
2059 if (err)
2060 goto err_aes_algs;
2061 }
2062
2063 if (dd->caps.has_cfb64) {
2064 err = crypto_register_alg(&aes_cfb64_alg);
2065 if (err)
2066 goto err_aes_cfb64_alg;
2067 }
2068
2069 if (dd->caps.has_gcm) {
2070 err = crypto_register_aead(&aes_gcm_alg);
2071 if (err)
2072 goto err_aes_gcm_alg;
2073 }
2074
2075 if (dd->caps.has_xts) {
2076 err = crypto_register_alg(&aes_xts_alg);
2077 if (err)
2078 goto err_aes_xts_alg;
2079 }
2080
2081 return 0;
2082
2083 err_aes_xts_alg:
2084 crypto_unregister_aead(&aes_gcm_alg);
2085 err_aes_gcm_alg:
2086 crypto_unregister_alg(&aes_cfb64_alg);
2087 err_aes_cfb64_alg:
2088 i = ARRAY_SIZE(aes_algs);
2089 err_aes_algs:
2090 for (j = 0; j < i; j++)
2091 crypto_unregister_alg(&aes_algs[j]);
2092
2093 return err;
2094 }
2095
2096 static void atmel_aes_get_cap(struct atmel_aes_dev *dd)
2097 {
2098 dd->caps.has_dualbuff = 0;
2099 dd->caps.has_cfb64 = 0;
2100 dd->caps.has_ctr32 = 0;
2101 dd->caps.has_gcm = 0;
2102 dd->caps.has_xts = 0;
2103 dd->caps.max_burst_size = 1;
2104
2105 /* keep only major version number */
2106 switch (dd->hw_version & 0xff0) {
2107 case 0x500:
2108 dd->caps.has_dualbuff = 1;
2109 dd->caps.has_cfb64 = 1;
2110 dd->caps.has_ctr32 = 1;
2111 dd->caps.has_gcm = 1;
2112 dd->caps.has_xts = 1;
2113 dd->caps.max_burst_size = 4;
2114 break;
2115 case 0x200:
2116 dd->caps.has_dualbuff = 1;
2117 dd->caps.has_cfb64 = 1;
2118 dd->caps.has_ctr32 = 1;
2119 dd->caps.has_gcm = 1;
2120 dd->caps.max_burst_size = 4;
2121 break;
2122 case 0x130:
2123 dd->caps.has_dualbuff = 1;
2124 dd->caps.has_cfb64 = 1;
2125 dd->caps.max_burst_size = 4;
2126 break;
2127 case 0x120:
2128 break;
2129 default:
2130 dev_warn(dd->dev,
2131 "Unmanaged aes version, set minimum capabilities\n");
2132 break;
2133 }
2134 }
2135
2136 #if defined(CONFIG_OF)
2137 static const struct of_device_id atmel_aes_dt_ids[] = {
2138 { .compatible = "atmel,at91sam9g46-aes" },
2139 { /* sentinel */ }
2140 };
2141 MODULE_DEVICE_TABLE(of, atmel_aes_dt_ids);
2142
2143 static struct crypto_platform_data *atmel_aes_of_init(struct platform_device *pdev)
2144 {
2145 struct device_node *np = pdev->dev.of_node;
2146 struct crypto_platform_data *pdata;
2147
2148 if (!np) {
2149 dev_err(&pdev->dev, "device node not found\n");
2150 return ERR_PTR(-EINVAL);
2151 }
2152
2153 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
2154 if (!pdata) {
2155 dev_err(&pdev->dev, "could not allocate memory for pdata\n");
2156 return ERR_PTR(-ENOMEM);
2157 }
2158
2159 pdata->dma_slave = devm_kzalloc(&pdev->dev,
2160 sizeof(*(pdata->dma_slave)),
2161 GFP_KERNEL);
2162 if (!pdata->dma_slave) {
2163 dev_err(&pdev->dev, "could not allocate memory for dma_slave\n");
2164 devm_kfree(&pdev->dev, pdata);
2165 return ERR_PTR(-ENOMEM);
2166 }
2167
2168 return pdata;
2169 }
2170 #else
2171 static inline struct crypto_platform_data *atmel_aes_of_init(struct platform_device *pdev)
2172 {
2173 return ERR_PTR(-EINVAL);
2174 }
2175 #endif
2176
2177 static int atmel_aes_probe(struct platform_device *pdev)
2178 {
2179 struct atmel_aes_dev *aes_dd;
2180 struct crypto_platform_data *pdata;
2181 struct device *dev = &pdev->dev;
2182 struct resource *aes_res;
2183 int err;
2184
2185 pdata = pdev->dev.platform_data;
2186 if (!pdata) {
2187 pdata = atmel_aes_of_init(pdev);
2188 if (IS_ERR(pdata)) {
2189 err = PTR_ERR(pdata);
2190 goto aes_dd_err;
2191 }
2192 }
2193
2194 if (!pdata->dma_slave) {
2195 err = -ENXIO;
2196 goto aes_dd_err;
2197 }
2198
2199 aes_dd = devm_kzalloc(&pdev->dev, sizeof(*aes_dd), GFP_KERNEL);
2200 if (aes_dd == NULL) {
2201 dev_err(dev, "unable to alloc data struct.\n");
2202 err = -ENOMEM;
2203 goto aes_dd_err;
2204 }
2205
2206 aes_dd->dev = dev;
2207
2208 platform_set_drvdata(pdev, aes_dd);
2209
2210 INIT_LIST_HEAD(&aes_dd->list);
2211 spin_lock_init(&aes_dd->lock);
2212
2213 tasklet_init(&aes_dd->done_task, atmel_aes_done_task,
2214 (unsigned long)aes_dd);
2215 tasklet_init(&aes_dd->queue_task, atmel_aes_queue_task,
2216 (unsigned long)aes_dd);
2217
2218 crypto_init_queue(&aes_dd->queue, ATMEL_AES_QUEUE_LENGTH);
2219
2220 aes_dd->irq = -1;
2221
2222 /* Get the base address */
2223 aes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2224 if (!aes_res) {
2225 dev_err(dev, "no MEM resource info\n");
2226 err = -ENODEV;
2227 goto res_err;
2228 }
2229 aes_dd->phys_base = aes_res->start;
2230
2231 /* Get the IRQ */
2232 aes_dd->irq = platform_get_irq(pdev, 0);
2233 if (aes_dd->irq < 0) {
2234 dev_err(dev, "no IRQ resource info\n");
2235 err = aes_dd->irq;
2236 goto res_err;
2237 }
2238
2239 err = devm_request_irq(&pdev->dev, aes_dd->irq, atmel_aes_irq,
2240 IRQF_SHARED, "atmel-aes", aes_dd);
2241 if (err) {
2242 dev_err(dev, "unable to request aes irq.\n");
2243 goto res_err;
2244 }
2245
2246 /* Initializing the clock */
2247 aes_dd->iclk = devm_clk_get(&pdev->dev, "aes_clk");
2248 if (IS_ERR(aes_dd->iclk)) {
2249 dev_err(dev, "clock initialization failed.\n");
2250 err = PTR_ERR(aes_dd->iclk);
2251 goto res_err;
2252 }
2253
2254 aes_dd->io_base = devm_ioremap_resource(&pdev->dev, aes_res);
2255 if (IS_ERR(aes_dd->io_base)) {
2256 dev_err(dev, "can't ioremap\n");
2257 err = PTR_ERR(aes_dd->io_base);
2258 goto res_err;
2259 }
2260
2261 err = clk_prepare(aes_dd->iclk);
2262 if (err)
2263 goto res_err;
2264
2265 err = atmel_aes_hw_version_init(aes_dd);
2266 if (err)
2267 goto iclk_unprepare;
2268
2269 atmel_aes_get_cap(aes_dd);
2270
2271 err = atmel_aes_buff_init(aes_dd);
2272 if (err)
2273 goto err_aes_buff;
2274
2275 err = atmel_aes_dma_init(aes_dd, pdata);
2276 if (err)
2277 goto err_aes_dma;
2278
2279 spin_lock(&atmel_aes.lock);
2280 list_add_tail(&aes_dd->list, &atmel_aes.dev_list);
2281 spin_unlock(&atmel_aes.lock);
2282
2283 err = atmel_aes_register_algs(aes_dd);
2284 if (err)
2285 goto err_algs;
2286
2287 dev_info(dev, "Atmel AES - Using %s, %s for DMA transfers\n",
2288 dma_chan_name(aes_dd->src.chan),
2289 dma_chan_name(aes_dd->dst.chan));
2290
2291 return 0;
2292
2293 err_algs:
2294 spin_lock(&atmel_aes.lock);
2295 list_del(&aes_dd->list);
2296 spin_unlock(&atmel_aes.lock);
2297 atmel_aes_dma_cleanup(aes_dd);
2298 err_aes_dma:
2299 atmel_aes_buff_cleanup(aes_dd);
2300 err_aes_buff:
2301 iclk_unprepare:
2302 clk_unprepare(aes_dd->iclk);
2303 res_err:
2304 tasklet_kill(&aes_dd->done_task);
2305 tasklet_kill(&aes_dd->queue_task);
2306 aes_dd_err:
2307 dev_err(dev, "initialization failed.\n");
2308
2309 return err;
2310 }
2311
2312 static int atmel_aes_remove(struct platform_device *pdev)
2313 {
2314 struct atmel_aes_dev *aes_dd;
2315
2316 aes_dd = platform_get_drvdata(pdev);
2317 if (!aes_dd)
2318 return -ENODEV;
2319 spin_lock(&atmel_aes.lock);
2320 list_del(&aes_dd->list);
2321 spin_unlock(&atmel_aes.lock);
2322
2323 atmel_aes_unregister_algs(aes_dd);
2324
2325 tasklet_kill(&aes_dd->done_task);
2326 tasklet_kill(&aes_dd->queue_task);
2327
2328 atmel_aes_dma_cleanup(aes_dd);
2329 atmel_aes_buff_cleanup(aes_dd);
2330
2331 clk_unprepare(aes_dd->iclk);
2332
2333 return 0;
2334 }
2335
2336 static struct platform_driver atmel_aes_driver = {
2337 .probe = atmel_aes_probe,
2338 .remove = atmel_aes_remove,
2339 .driver = {
2340 .name = "atmel_aes",
2341 .of_match_table = of_match_ptr(atmel_aes_dt_ids),
2342 },
2343 };
2344
2345 module_platform_driver(atmel_aes_driver);
2346
2347 MODULE_DESCRIPTION("Atmel AES hw acceleration support.");
2348 MODULE_LICENSE("GPL v2");
2349 MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
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