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Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / drivers / crypto / atmel-aes.c
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/internal/aead.h>
40 #include <linux/platform_data/crypto-atmel.h>
41 #include <dt-bindings/dma/at91.h>
42 #include "atmel-aes-regs.h"
43
44 #define ATMEL_AES_PRIORITY 300
45
46 #define ATMEL_AES_BUFFER_ORDER 2
47 #define ATMEL_AES_BUFFER_SIZE (PAGE_SIZE << ATMEL_AES_BUFFER_ORDER)
48
49 #define CFB8_BLOCK_SIZE 1
50 #define CFB16_BLOCK_SIZE 2
51 #define CFB32_BLOCK_SIZE 4
52 #define CFB64_BLOCK_SIZE 8
53
54 #define SIZE_IN_WORDS(x) ((x) >> 2)
55
56 /* AES flags */
57 /* Reserve bits [18:16] [14:12] [1:0] for mode (same as for AES_MR) */
58 #define AES_FLAGS_ENCRYPT AES_MR_CYPHER_ENC
59 #define AES_FLAGS_GTAGEN AES_MR_GTAGEN
60 #define AES_FLAGS_OPMODE_MASK (AES_MR_OPMOD_MASK | AES_MR_CFBS_MASK)
61 #define AES_FLAGS_ECB AES_MR_OPMOD_ECB
62 #define AES_FLAGS_CBC AES_MR_OPMOD_CBC
63 #define AES_FLAGS_OFB AES_MR_OPMOD_OFB
64 #define AES_FLAGS_CFB128 (AES_MR_OPMOD_CFB | AES_MR_CFBS_128b)
65 #define AES_FLAGS_CFB64 (AES_MR_OPMOD_CFB | AES_MR_CFBS_64b)
66 #define AES_FLAGS_CFB32 (AES_MR_OPMOD_CFB | AES_MR_CFBS_32b)
67 #define AES_FLAGS_CFB16 (AES_MR_OPMOD_CFB | AES_MR_CFBS_16b)
68 #define AES_FLAGS_CFB8 (AES_MR_OPMOD_CFB | AES_MR_CFBS_8b)
69 #define AES_FLAGS_CTR AES_MR_OPMOD_CTR
70 #define AES_FLAGS_GCM AES_MR_OPMOD_GCM
71
72 #define AES_FLAGS_MODE_MASK (AES_FLAGS_OPMODE_MASK | \
73 AES_FLAGS_ENCRYPT | \
74 AES_FLAGS_GTAGEN)
75
76 #define AES_FLAGS_INIT BIT(2)
77 #define AES_FLAGS_BUSY BIT(3)
78 #define AES_FLAGS_DUMP_REG BIT(4)
79
80 #define AES_FLAGS_PERSISTENT (AES_FLAGS_INIT | AES_FLAGS_BUSY)
81
82 #define ATMEL_AES_QUEUE_LENGTH 50
83
84 #define ATMEL_AES_DMA_THRESHOLD 256
85
86
87 struct atmel_aes_caps {
88 bool has_dualbuff;
89 bool has_cfb64;
90 bool has_ctr32;
91 bool has_gcm;
92 u32 max_burst_size;
93 };
94
95 struct atmel_aes_dev;
96
97
98 typedef int (*atmel_aes_fn_t)(struct atmel_aes_dev *);
99
100
101 struct atmel_aes_base_ctx {
102 struct atmel_aes_dev *dd;
103 atmel_aes_fn_t start;
104 int keylen;
105 u32 key[AES_KEYSIZE_256 / sizeof(u32)];
106 u16 block_size;
107 };
108
109 struct atmel_aes_ctx {
110 struct atmel_aes_base_ctx base;
111 };
112
113 struct atmel_aes_ctr_ctx {
114 struct atmel_aes_base_ctx base;
115
116 u32 iv[AES_BLOCK_SIZE / sizeof(u32)];
117 size_t offset;
118 struct scatterlist src[2];
119 struct scatterlist dst[2];
120 };
121
122 struct atmel_aes_gcm_ctx {
123 struct atmel_aes_base_ctx base;
124
125 struct scatterlist src[2];
126 struct scatterlist dst[2];
127
128 u32 j0[AES_BLOCK_SIZE / sizeof(u32)];
129 u32 tag[AES_BLOCK_SIZE / sizeof(u32)];
130 u32 ghash[AES_BLOCK_SIZE / sizeof(u32)];
131 size_t textlen;
132
133 const u32 *ghash_in;
134 u32 *ghash_out;
135 atmel_aes_fn_t ghash_resume;
136 };
137
138 struct atmel_aes_reqctx {
139 unsigned long mode;
140 };
141
142 struct atmel_aes_dma {
143 struct dma_chan *chan;
144 struct scatterlist *sg;
145 int nents;
146 unsigned int remainder;
147 unsigned int sg_len;
148 };
149
150 struct atmel_aes_dev {
151 struct list_head list;
152 unsigned long phys_base;
153 void __iomem *io_base;
154
155 struct crypto_async_request *areq;
156 struct atmel_aes_base_ctx *ctx;
157
158 bool is_async;
159 atmel_aes_fn_t resume;
160 atmel_aes_fn_t cpu_transfer_complete;
161
162 struct device *dev;
163 struct clk *iclk;
164 int irq;
165
166 unsigned long flags;
167
168 spinlock_t lock;
169 struct crypto_queue queue;
170
171 struct tasklet_struct done_task;
172 struct tasklet_struct queue_task;
173
174 size_t total;
175 size_t datalen;
176 u32 *data;
177
178 struct atmel_aes_dma src;
179 struct atmel_aes_dma dst;
180
181 size_t buflen;
182 void *buf;
183 struct scatterlist aligned_sg;
184 struct scatterlist *real_dst;
185
186 struct atmel_aes_caps caps;
187
188 u32 hw_version;
189 };
190
191 struct atmel_aes_drv {
192 struct list_head dev_list;
193 spinlock_t lock;
194 };
195
196 static struct atmel_aes_drv atmel_aes = {
197 .dev_list = LIST_HEAD_INIT(atmel_aes.dev_list),
198 .lock = __SPIN_LOCK_UNLOCKED(atmel_aes.lock),
199 };
200
201 #ifdef VERBOSE_DEBUG
202 static const char *atmel_aes_reg_name(u32 offset, char *tmp, size_t sz)
203 {
204 switch (offset) {
205 case AES_CR:
206 return "CR";
207
208 case AES_MR:
209 return "MR";
210
211 case AES_ISR:
212 return "ISR";
213
214 case AES_IMR:
215 return "IMR";
216
217 case AES_IER:
218 return "IER";
219
220 case AES_IDR:
221 return "IDR";
222
223 case AES_KEYWR(0):
224 case AES_KEYWR(1):
225 case AES_KEYWR(2):
226 case AES_KEYWR(3):
227 case AES_KEYWR(4):
228 case AES_KEYWR(5):
229 case AES_KEYWR(6):
230 case AES_KEYWR(7):
231 snprintf(tmp, sz, "KEYWR[%u]", (offset - AES_KEYWR(0)) >> 2);
232 break;
233
234 case AES_IDATAR(0):
235 case AES_IDATAR(1):
236 case AES_IDATAR(2):
237 case AES_IDATAR(3):
238 snprintf(tmp, sz, "IDATAR[%u]", (offset - AES_IDATAR(0)) >> 2);
239 break;
240
241 case AES_ODATAR(0):
242 case AES_ODATAR(1):
243 case AES_ODATAR(2):
244 case AES_ODATAR(3):
245 snprintf(tmp, sz, "ODATAR[%u]", (offset - AES_ODATAR(0)) >> 2);
246 break;
247
248 case AES_IVR(0):
249 case AES_IVR(1):
250 case AES_IVR(2):
251 case AES_IVR(3):
252 snprintf(tmp, sz, "IVR[%u]", (offset - AES_IVR(0)) >> 2);
253 break;
254
255 case AES_AADLENR:
256 return "AADLENR";
257
258 case AES_CLENR:
259 return "CLENR";
260
261 case AES_GHASHR(0):
262 case AES_GHASHR(1):
263 case AES_GHASHR(2):
264 case AES_GHASHR(3):
265 snprintf(tmp, sz, "GHASHR[%u]", (offset - AES_GHASHR(0)) >> 2);
266 break;
267
268 case AES_TAGR(0):
269 case AES_TAGR(1):
270 case AES_TAGR(2):
271 case AES_TAGR(3):
272 snprintf(tmp, sz, "TAGR[%u]", (offset - AES_TAGR(0)) >> 2);
273 break;
274
275 case AES_CTRR:
276 return "CTRR";
277
278 case AES_GCMHR(0):
279 case AES_GCMHR(1):
280 case AES_GCMHR(2):
281 case AES_GCMHR(3):
282 snprintf(tmp, sz, "GCMHR[%u]", (offset - AES_GCMHR(0)) >> 2);
283 break;
284
285 default:
286 snprintf(tmp, sz, "0x%02x", offset);
287 break;
288 }
289
290 return tmp;
291 }
292 #endif /* VERBOSE_DEBUG */
293
294 /* Shared functions */
295
296 static inline u32 atmel_aes_read(struct atmel_aes_dev *dd, u32 offset)
297 {
298 u32 value = readl_relaxed(dd->io_base + offset);
299
300 #ifdef VERBOSE_DEBUG
301 if (dd->flags & AES_FLAGS_DUMP_REG) {
302 char tmp[16];
303
304 dev_vdbg(dd->dev, "read 0x%08x from %s\n", value,
305 atmel_aes_reg_name(offset, tmp, sizeof(tmp)));
306 }
307 #endif /* VERBOSE_DEBUG */
308
309 return value;
310 }
311
312 static inline void atmel_aes_write(struct atmel_aes_dev *dd,
313 u32 offset, u32 value)
314 {
315 #ifdef VERBOSE_DEBUG
316 if (dd->flags & AES_FLAGS_DUMP_REG) {
317 char tmp[16];
318
319 dev_vdbg(dd->dev, "write 0x%08x into %s\n", value,
320 atmel_aes_reg_name(offset, tmp));
321 }
322 #endif /* VERBOSE_DEBUG */
323
324 writel_relaxed(value, dd->io_base + offset);
325 }
326
327 static void atmel_aes_read_n(struct atmel_aes_dev *dd, u32 offset,
328 u32 *value, int count)
329 {
330 for (; count--; value++, offset += 4)
331 *value = atmel_aes_read(dd, offset);
332 }
333
334 static void atmel_aes_write_n(struct atmel_aes_dev *dd, u32 offset,
335 const u32 *value, int count)
336 {
337 for (; count--; value++, offset += 4)
338 atmel_aes_write(dd, offset, *value);
339 }
340
341 static inline void atmel_aes_read_block(struct atmel_aes_dev *dd, u32 offset,
342 u32 *value)
343 {
344 atmel_aes_read_n(dd, offset, value, SIZE_IN_WORDS(AES_BLOCK_SIZE));
345 }
346
347 static inline void atmel_aes_write_block(struct atmel_aes_dev *dd, u32 offset,
348 const u32 *value)
349 {
350 atmel_aes_write_n(dd, offset, value, SIZE_IN_WORDS(AES_BLOCK_SIZE));
351 }
352
353 static inline int atmel_aes_wait_for_data_ready(struct atmel_aes_dev *dd,
354 atmel_aes_fn_t resume)
355 {
356 u32 isr = atmel_aes_read(dd, AES_ISR);
357
358 if (unlikely(isr & AES_INT_DATARDY))
359 return resume(dd);
360
361 dd->resume = resume;
362 atmel_aes_write(dd, AES_IER, AES_INT_DATARDY);
363 return -EINPROGRESS;
364 }
365
366 static inline size_t atmel_aes_padlen(size_t len, size_t block_size)
367 {
368 len &= block_size - 1;
369 return len ? block_size - len : 0;
370 }
371
372 static inline struct aead_request *
373 aead_request_cast(struct crypto_async_request *req)
374 {
375 return container_of(req, struct aead_request, base);
376 }
377
378 static struct atmel_aes_dev *atmel_aes_find_dev(struct atmel_aes_base_ctx *ctx)
379 {
380 struct atmel_aes_dev *aes_dd = NULL;
381 struct atmel_aes_dev *tmp;
382
383 spin_lock_bh(&atmel_aes.lock);
384 if (!ctx->dd) {
385 list_for_each_entry(tmp, &atmel_aes.dev_list, list) {
386 aes_dd = tmp;
387 break;
388 }
389 ctx->dd = aes_dd;
390 } else {
391 aes_dd = ctx->dd;
392 }
393
394 spin_unlock_bh(&atmel_aes.lock);
395
396 return aes_dd;
397 }
398
399 static int atmel_aes_hw_init(struct atmel_aes_dev *dd)
400 {
401 int err;
402
403 err = clk_enable(dd->iclk);
404 if (err)
405 return err;
406
407 if (!(dd->flags & AES_FLAGS_INIT)) {
408 atmel_aes_write(dd, AES_CR, AES_CR_SWRST);
409 atmel_aes_write(dd, AES_MR, 0xE << AES_MR_CKEY_OFFSET);
410 dd->flags |= AES_FLAGS_INIT;
411 }
412
413 return 0;
414 }
415
416 static inline unsigned int atmel_aes_get_version(struct atmel_aes_dev *dd)
417 {
418 return atmel_aes_read(dd, AES_HW_VERSION) & 0x00000fff;
419 }
420
421 static int atmel_aes_hw_version_init(struct atmel_aes_dev *dd)
422 {
423 int err;
424
425 err = atmel_aes_hw_init(dd);
426 if (err)
427 return err;
428
429 dd->hw_version = atmel_aes_get_version(dd);
430
431 dev_info(dd->dev, "version: 0x%x\n", dd->hw_version);
432
433 clk_disable(dd->iclk);
434 return 0;
435 }
436
437 static inline void atmel_aes_set_mode(struct atmel_aes_dev *dd,
438 const struct atmel_aes_reqctx *rctx)
439 {
440 /* Clear all but persistent flags and set request flags. */
441 dd->flags = (dd->flags & AES_FLAGS_PERSISTENT) | rctx->mode;
442 }
443
444 static inline bool atmel_aes_is_encrypt(const struct atmel_aes_dev *dd)
445 {
446 return (dd->flags & AES_FLAGS_ENCRYPT);
447 }
448
449 static inline int atmel_aes_complete(struct atmel_aes_dev *dd, int err)
450 {
451 clk_disable(dd->iclk);
452 dd->flags &= ~AES_FLAGS_BUSY;
453
454 if (dd->is_async)
455 dd->areq->complete(dd->areq, err);
456
457 tasklet_schedule(&dd->queue_task);
458
459 return err;
460 }
461
462 static void atmel_aes_write_ctrl(struct atmel_aes_dev *dd, bool use_dma,
463 const u32 *iv)
464 {
465 u32 valmr = 0;
466
467 /* MR register must be set before IV registers */
468 if (dd->ctx->keylen == AES_KEYSIZE_128)
469 valmr |= AES_MR_KEYSIZE_128;
470 else if (dd->ctx->keylen == AES_KEYSIZE_192)
471 valmr |= AES_MR_KEYSIZE_192;
472 else
473 valmr |= AES_MR_KEYSIZE_256;
474
475 valmr |= dd->flags & AES_FLAGS_MODE_MASK;
476
477 if (use_dma) {
478 valmr |= AES_MR_SMOD_IDATAR0;
479 if (dd->caps.has_dualbuff)
480 valmr |= AES_MR_DUALBUFF;
481 } else {
482 valmr |= AES_MR_SMOD_AUTO;
483 }
484
485 atmel_aes_write(dd, AES_MR, valmr);
486
487 atmel_aes_write_n(dd, AES_KEYWR(0), dd->ctx->key,
488 SIZE_IN_WORDS(dd->ctx->keylen));
489
490 if (iv && (valmr & AES_MR_OPMOD_MASK) != AES_MR_OPMOD_ECB)
491 atmel_aes_write_block(dd, AES_IVR(0), iv);
492 }
493
494
495 /* CPU transfer */
496
497 static int atmel_aes_cpu_transfer(struct atmel_aes_dev *dd)
498 {
499 int err = 0;
500 u32 isr;
501
502 for (;;) {
503 atmel_aes_read_block(dd, AES_ODATAR(0), dd->data);
504 dd->data += 4;
505 dd->datalen -= AES_BLOCK_SIZE;
506
507 if (dd->datalen < AES_BLOCK_SIZE)
508 break;
509
510 atmel_aes_write_block(dd, AES_IDATAR(0), dd->data);
511
512 isr = atmel_aes_read(dd, AES_ISR);
513 if (!(isr & AES_INT_DATARDY)) {
514 dd->resume = atmel_aes_cpu_transfer;
515 atmel_aes_write(dd, AES_IER, AES_INT_DATARDY);
516 return -EINPROGRESS;
517 }
518 }
519
520 if (!sg_copy_from_buffer(dd->real_dst, sg_nents(dd->real_dst),
521 dd->buf, dd->total))
522 err = -EINVAL;
523
524 if (err)
525 return atmel_aes_complete(dd, err);
526
527 return dd->cpu_transfer_complete(dd);
528 }
529
530 static int atmel_aes_cpu_start(struct atmel_aes_dev *dd,
531 struct scatterlist *src,
532 struct scatterlist *dst,
533 size_t len,
534 atmel_aes_fn_t resume)
535 {
536 size_t padlen = atmel_aes_padlen(len, AES_BLOCK_SIZE);
537
538 if (unlikely(len == 0))
539 return -EINVAL;
540
541 sg_copy_to_buffer(src, sg_nents(src), dd->buf, len);
542
543 dd->total = len;
544 dd->real_dst = dst;
545 dd->cpu_transfer_complete = resume;
546 dd->datalen = len + padlen;
547 dd->data = (u32 *)dd->buf;
548 atmel_aes_write_block(dd, AES_IDATAR(0), dd->data);
549 return atmel_aes_wait_for_data_ready(dd, atmel_aes_cpu_transfer);
550 }
551
552
553 /* DMA transfer */
554
555 static void atmel_aes_dma_callback(void *data);
556
557 static bool atmel_aes_check_aligned(struct atmel_aes_dev *dd,
558 struct scatterlist *sg,
559 size_t len,
560 struct atmel_aes_dma *dma)
561 {
562 int nents;
563
564 if (!IS_ALIGNED(len, dd->ctx->block_size))
565 return false;
566
567 for (nents = 0; sg; sg = sg_next(sg), ++nents) {
568 if (!IS_ALIGNED(sg->offset, sizeof(u32)))
569 return false;
570
571 if (len <= sg->length) {
572 if (!IS_ALIGNED(len, dd->ctx->block_size))
573 return false;
574
575 dma->nents = nents+1;
576 dma->remainder = sg->length - len;
577 sg->length = len;
578 return true;
579 }
580
581 if (!IS_ALIGNED(sg->length, dd->ctx->block_size))
582 return false;
583
584 len -= sg->length;
585 }
586
587 return false;
588 }
589
590 static inline void atmel_aes_restore_sg(const struct atmel_aes_dma *dma)
591 {
592 struct scatterlist *sg = dma->sg;
593 int nents = dma->nents;
594
595 if (!dma->remainder)
596 return;
597
598 while (--nents > 0 && sg)
599 sg = sg_next(sg);
600
601 if (!sg)
602 return;
603
604 sg->length += dma->remainder;
605 }
606
607 static int atmel_aes_map(struct atmel_aes_dev *dd,
608 struct scatterlist *src,
609 struct scatterlist *dst,
610 size_t len)
611 {
612 bool src_aligned, dst_aligned;
613 size_t padlen;
614
615 dd->total = len;
616 dd->src.sg = src;
617 dd->dst.sg = dst;
618 dd->real_dst = dst;
619
620 src_aligned = atmel_aes_check_aligned(dd, src, len, &dd->src);
621 if (src == dst)
622 dst_aligned = src_aligned;
623 else
624 dst_aligned = atmel_aes_check_aligned(dd, dst, len, &dd->dst);
625 if (!src_aligned || !dst_aligned) {
626 padlen = atmel_aes_padlen(len, dd->ctx->block_size);
627
628 if (dd->buflen < len + padlen)
629 return -ENOMEM;
630
631 if (!src_aligned) {
632 sg_copy_to_buffer(src, sg_nents(src), dd->buf, len);
633 dd->src.sg = &dd->aligned_sg;
634 dd->src.nents = 1;
635 dd->src.remainder = 0;
636 }
637
638 if (!dst_aligned) {
639 dd->dst.sg = &dd->aligned_sg;
640 dd->dst.nents = 1;
641 dd->dst.remainder = 0;
642 }
643
644 sg_init_table(&dd->aligned_sg, 1);
645 sg_set_buf(&dd->aligned_sg, dd->buf, len + padlen);
646 }
647
648 if (dd->src.sg == dd->dst.sg) {
649 dd->src.sg_len = dma_map_sg(dd->dev, dd->src.sg, dd->src.nents,
650 DMA_BIDIRECTIONAL);
651 dd->dst.sg_len = dd->src.sg_len;
652 if (!dd->src.sg_len)
653 return -EFAULT;
654 } else {
655 dd->src.sg_len = dma_map_sg(dd->dev, dd->src.sg, dd->src.nents,
656 DMA_TO_DEVICE);
657 if (!dd->src.sg_len)
658 return -EFAULT;
659
660 dd->dst.sg_len = dma_map_sg(dd->dev, dd->dst.sg, dd->dst.nents,
661 DMA_FROM_DEVICE);
662 if (!dd->dst.sg_len) {
663 dma_unmap_sg(dd->dev, dd->src.sg, dd->src.nents,
664 DMA_TO_DEVICE);
665 return -EFAULT;
666 }
667 }
668
669 return 0;
670 }
671
672 static void atmel_aes_unmap(struct atmel_aes_dev *dd)
673 {
674 if (dd->src.sg == dd->dst.sg) {
675 dma_unmap_sg(dd->dev, dd->src.sg, dd->src.nents,
676 DMA_BIDIRECTIONAL);
677
678 if (dd->src.sg != &dd->aligned_sg)
679 atmel_aes_restore_sg(&dd->src);
680 } else {
681 dma_unmap_sg(dd->dev, dd->dst.sg, dd->dst.nents,
682 DMA_FROM_DEVICE);
683
684 if (dd->dst.sg != &dd->aligned_sg)
685 atmel_aes_restore_sg(&dd->dst);
686
687 dma_unmap_sg(dd->dev, dd->src.sg, dd->src.nents,
688 DMA_TO_DEVICE);
689
690 if (dd->src.sg != &dd->aligned_sg)
691 atmel_aes_restore_sg(&dd->src);
692 }
693
694 if (dd->dst.sg == &dd->aligned_sg)
695 sg_copy_from_buffer(dd->real_dst, sg_nents(dd->real_dst),
696 dd->buf, dd->total);
697 }
698
699 static int atmel_aes_dma_transfer_start(struct atmel_aes_dev *dd,
700 enum dma_slave_buswidth addr_width,
701 enum dma_transfer_direction dir,
702 u32 maxburst)
703 {
704 struct dma_async_tx_descriptor *desc;
705 struct dma_slave_config config;
706 dma_async_tx_callback callback;
707 struct atmel_aes_dma *dma;
708 int err;
709
710 memset(&config, 0, sizeof(config));
711 config.direction = dir;
712 config.src_addr_width = addr_width;
713 config.dst_addr_width = addr_width;
714 config.src_maxburst = maxburst;
715 config.dst_maxburst = maxburst;
716
717 switch (dir) {
718 case DMA_MEM_TO_DEV:
719 dma = &dd->src;
720 callback = NULL;
721 config.dst_addr = dd->phys_base + AES_IDATAR(0);
722 break;
723
724 case DMA_DEV_TO_MEM:
725 dma = &dd->dst;
726 callback = atmel_aes_dma_callback;
727 config.src_addr = dd->phys_base + AES_ODATAR(0);
728 break;
729
730 default:
731 return -EINVAL;
732 }
733
734 err = dmaengine_slave_config(dma->chan, &config);
735 if (err)
736 return err;
737
738 desc = dmaengine_prep_slave_sg(dma->chan, dma->sg, dma->sg_len, dir,
739 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
740 if (!desc)
741 return -ENOMEM;
742
743 desc->callback = callback;
744 desc->callback_param = dd;
745 dmaengine_submit(desc);
746 dma_async_issue_pending(dma->chan);
747
748 return 0;
749 }
750
751 static void atmel_aes_dma_transfer_stop(struct atmel_aes_dev *dd,
752 enum dma_transfer_direction dir)
753 {
754 struct atmel_aes_dma *dma;
755
756 switch (dir) {
757 case DMA_MEM_TO_DEV:
758 dma = &dd->src;
759 break;
760
761 case DMA_DEV_TO_MEM:
762 dma = &dd->dst;
763 break;
764
765 default:
766 return;
767 }
768
769 dmaengine_terminate_all(dma->chan);
770 }
771
772 static int atmel_aes_dma_start(struct atmel_aes_dev *dd,
773 struct scatterlist *src,
774 struct scatterlist *dst,
775 size_t len,
776 atmel_aes_fn_t resume)
777 {
778 enum dma_slave_buswidth addr_width;
779 u32 maxburst;
780 int err;
781
782 switch (dd->ctx->block_size) {
783 case CFB8_BLOCK_SIZE:
784 addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
785 maxburst = 1;
786 break;
787
788 case CFB16_BLOCK_SIZE:
789 addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
790 maxburst = 1;
791 break;
792
793 case CFB32_BLOCK_SIZE:
794 case CFB64_BLOCK_SIZE:
795 addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
796 maxburst = 1;
797 break;
798
799 case AES_BLOCK_SIZE:
800 addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
801 maxburst = dd->caps.max_burst_size;
802 break;
803
804 default:
805 err = -EINVAL;
806 goto exit;
807 }
808
809 err = atmel_aes_map(dd, src, dst, len);
810 if (err)
811 goto exit;
812
813 dd->resume = resume;
814
815 /* Set output DMA transfer first */
816 err = atmel_aes_dma_transfer_start(dd, addr_width, DMA_DEV_TO_MEM,
817 maxburst);
818 if (err)
819 goto unmap;
820
821 /* Then set input DMA transfer */
822 err = atmel_aes_dma_transfer_start(dd, addr_width, DMA_MEM_TO_DEV,
823 maxburst);
824 if (err)
825 goto output_transfer_stop;
826
827 return -EINPROGRESS;
828
829 output_transfer_stop:
830 atmel_aes_dma_transfer_stop(dd, DMA_DEV_TO_MEM);
831 unmap:
832 atmel_aes_unmap(dd);
833 exit:
834 return atmel_aes_complete(dd, err);
835 }
836
837 static void atmel_aes_dma_stop(struct atmel_aes_dev *dd)
838 {
839 atmel_aes_dma_transfer_stop(dd, DMA_MEM_TO_DEV);
840 atmel_aes_dma_transfer_stop(dd, DMA_DEV_TO_MEM);
841 atmel_aes_unmap(dd);
842 }
843
844 static void atmel_aes_dma_callback(void *data)
845 {
846 struct atmel_aes_dev *dd = data;
847
848 atmel_aes_dma_stop(dd);
849 dd->is_async = true;
850 (void)dd->resume(dd);
851 }
852
853 static int atmel_aes_handle_queue(struct atmel_aes_dev *dd,
854 struct crypto_async_request *new_areq)
855 {
856 struct crypto_async_request *areq, *backlog;
857 struct atmel_aes_base_ctx *ctx;
858 unsigned long flags;
859 int err, ret = 0;
860
861 spin_lock_irqsave(&dd->lock, flags);
862 if (new_areq)
863 ret = crypto_enqueue_request(&dd->queue, new_areq);
864 if (dd->flags & AES_FLAGS_BUSY) {
865 spin_unlock_irqrestore(&dd->lock, flags);
866 return ret;
867 }
868 backlog = crypto_get_backlog(&dd->queue);
869 areq = crypto_dequeue_request(&dd->queue);
870 if (areq)
871 dd->flags |= AES_FLAGS_BUSY;
872 spin_unlock_irqrestore(&dd->lock, flags);
873
874 if (!areq)
875 return ret;
876
877 if (backlog)
878 backlog->complete(backlog, -EINPROGRESS);
879
880 ctx = crypto_tfm_ctx(areq->tfm);
881
882 dd->areq = areq;
883 dd->ctx = ctx;
884 dd->is_async = (areq != new_areq);
885
886 err = ctx->start(dd);
887 return (dd->is_async) ? ret : err;
888 }
889
890
891 /* AES async block ciphers */
892
893 static int atmel_aes_transfer_complete(struct atmel_aes_dev *dd)
894 {
895 return atmel_aes_complete(dd, 0);
896 }
897
898 static int atmel_aes_start(struct atmel_aes_dev *dd)
899 {
900 struct ablkcipher_request *req = ablkcipher_request_cast(dd->areq);
901 struct atmel_aes_reqctx *rctx = ablkcipher_request_ctx(req);
902 bool use_dma = (req->nbytes >= ATMEL_AES_DMA_THRESHOLD ||
903 dd->ctx->block_size != AES_BLOCK_SIZE);
904 int err;
905
906 atmel_aes_set_mode(dd, rctx);
907
908 err = atmel_aes_hw_init(dd);
909 if (err)
910 return atmel_aes_complete(dd, err);
911
912 atmel_aes_write_ctrl(dd, use_dma, req->info);
913 if (use_dma)
914 return atmel_aes_dma_start(dd, req->src, req->dst, req->nbytes,
915 atmel_aes_transfer_complete);
916
917 return atmel_aes_cpu_start(dd, req->src, req->dst, req->nbytes,
918 atmel_aes_transfer_complete);
919 }
920
921 static inline struct atmel_aes_ctr_ctx *
922 atmel_aes_ctr_ctx_cast(struct atmel_aes_base_ctx *ctx)
923 {
924 return container_of(ctx, struct atmel_aes_ctr_ctx, base);
925 }
926
927 static int atmel_aes_ctr_transfer(struct atmel_aes_dev *dd)
928 {
929 struct atmel_aes_ctr_ctx *ctx = atmel_aes_ctr_ctx_cast(dd->ctx);
930 struct ablkcipher_request *req = ablkcipher_request_cast(dd->areq);
931 struct scatterlist *src, *dst;
932 u32 ctr, blocks;
933 size_t datalen;
934 bool use_dma, fragmented = false;
935
936 /* Check for transfer completion. */
937 ctx->offset += dd->total;
938 if (ctx->offset >= req->nbytes)
939 return atmel_aes_transfer_complete(dd);
940
941 /* Compute data length. */
942 datalen = req->nbytes - ctx->offset;
943 blocks = DIV_ROUND_UP(datalen, AES_BLOCK_SIZE);
944 ctr = be32_to_cpu(ctx->iv[3]);
945 if (dd->caps.has_ctr32) {
946 /* Check 32bit counter overflow. */
947 u32 start = ctr;
948 u32 end = start + blocks - 1;
949
950 if (end < start) {
951 ctr |= 0xffffffff;
952 datalen = AES_BLOCK_SIZE * -start;
953 fragmented = true;
954 }
955 } else {
956 /* Check 16bit counter overflow. */
957 u16 start = ctr & 0xffff;
958 u16 end = start + (u16)blocks - 1;
959
960 if (blocks >> 16 || end < start) {
961 ctr |= 0xffff;
962 datalen = AES_BLOCK_SIZE * (0x10000-start);
963 fragmented = true;
964 }
965 }
966 use_dma = (datalen >= ATMEL_AES_DMA_THRESHOLD);
967
968 /* Jump to offset. */
969 src = scatterwalk_ffwd(ctx->src, req->src, ctx->offset);
970 dst = ((req->src == req->dst) ? src :
971 scatterwalk_ffwd(ctx->dst, req->dst, ctx->offset));
972
973 /* Configure hardware. */
974 atmel_aes_write_ctrl(dd, use_dma, ctx->iv);
975 if (unlikely(fragmented)) {
976 /*
977 * Increment the counter manually to cope with the hardware
978 * counter overflow.
979 */
980 ctx->iv[3] = cpu_to_be32(ctr);
981 crypto_inc((u8 *)ctx->iv, AES_BLOCK_SIZE);
982 }
983
984 if (use_dma)
985 return atmel_aes_dma_start(dd, src, dst, datalen,
986 atmel_aes_ctr_transfer);
987
988 return atmel_aes_cpu_start(dd, src, dst, datalen,
989 atmel_aes_ctr_transfer);
990 }
991
992 static int atmel_aes_ctr_start(struct atmel_aes_dev *dd)
993 {
994 struct atmel_aes_ctr_ctx *ctx = atmel_aes_ctr_ctx_cast(dd->ctx);
995 struct ablkcipher_request *req = ablkcipher_request_cast(dd->areq);
996 struct atmel_aes_reqctx *rctx = ablkcipher_request_ctx(req);
997 int err;
998
999 atmel_aes_set_mode(dd, rctx);
1000
1001 err = atmel_aes_hw_init(dd);
1002 if (err)
1003 return atmel_aes_complete(dd, err);
1004
1005 memcpy(ctx->iv, req->info, AES_BLOCK_SIZE);
1006 ctx->offset = 0;
1007 dd->total = 0;
1008 return atmel_aes_ctr_transfer(dd);
1009 }
1010
1011 static int atmel_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
1012 {
1013 struct atmel_aes_base_ctx *ctx;
1014 struct atmel_aes_reqctx *rctx;
1015 struct atmel_aes_dev *dd;
1016
1017 ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
1018 switch (mode & AES_FLAGS_OPMODE_MASK) {
1019 case AES_FLAGS_CFB8:
1020 ctx->block_size = CFB8_BLOCK_SIZE;
1021 break;
1022
1023 case AES_FLAGS_CFB16:
1024 ctx->block_size = CFB16_BLOCK_SIZE;
1025 break;
1026
1027 case AES_FLAGS_CFB32:
1028 ctx->block_size = CFB32_BLOCK_SIZE;
1029 break;
1030
1031 case AES_FLAGS_CFB64:
1032 ctx->block_size = CFB64_BLOCK_SIZE;
1033 break;
1034
1035 default:
1036 ctx->block_size = AES_BLOCK_SIZE;
1037 break;
1038 }
1039
1040 dd = atmel_aes_find_dev(ctx);
1041 if (!dd)
1042 return -ENODEV;
1043
1044 rctx = ablkcipher_request_ctx(req);
1045 rctx->mode = mode;
1046
1047 return atmel_aes_handle_queue(dd, &req->base);
1048 }
1049
1050 static int atmel_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
1051 unsigned int keylen)
1052 {
1053 struct atmel_aes_base_ctx *ctx = crypto_ablkcipher_ctx(tfm);
1054
1055 if (keylen != AES_KEYSIZE_128 &&
1056 keylen != AES_KEYSIZE_192 &&
1057 keylen != AES_KEYSIZE_256) {
1058 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
1059 return -EINVAL;
1060 }
1061
1062 memcpy(ctx->key, key, keylen);
1063 ctx->keylen = keylen;
1064
1065 return 0;
1066 }
1067
1068 static int atmel_aes_ecb_encrypt(struct ablkcipher_request *req)
1069 {
1070 return atmel_aes_crypt(req, AES_FLAGS_ECB | AES_FLAGS_ENCRYPT);
1071 }
1072
1073 static int atmel_aes_ecb_decrypt(struct ablkcipher_request *req)
1074 {
1075 return atmel_aes_crypt(req, AES_FLAGS_ECB);
1076 }
1077
1078 static int atmel_aes_cbc_encrypt(struct ablkcipher_request *req)
1079 {
1080 return atmel_aes_crypt(req, AES_FLAGS_CBC | AES_FLAGS_ENCRYPT);
1081 }
1082
1083 static int atmel_aes_cbc_decrypt(struct ablkcipher_request *req)
1084 {
1085 return atmel_aes_crypt(req, AES_FLAGS_CBC);
1086 }
1087
1088 static int atmel_aes_ofb_encrypt(struct ablkcipher_request *req)
1089 {
1090 return atmel_aes_crypt(req, AES_FLAGS_OFB | AES_FLAGS_ENCRYPT);
1091 }
1092
1093 static int atmel_aes_ofb_decrypt(struct ablkcipher_request *req)
1094 {
1095 return atmel_aes_crypt(req, AES_FLAGS_OFB);
1096 }
1097
1098 static int atmel_aes_cfb_encrypt(struct ablkcipher_request *req)
1099 {
1100 return atmel_aes_crypt(req, AES_FLAGS_CFB128 | AES_FLAGS_ENCRYPT);
1101 }
1102
1103 static int atmel_aes_cfb_decrypt(struct ablkcipher_request *req)
1104 {
1105 return atmel_aes_crypt(req, AES_FLAGS_CFB128);
1106 }
1107
1108 static int atmel_aes_cfb64_encrypt(struct ablkcipher_request *req)
1109 {
1110 return atmel_aes_crypt(req, AES_FLAGS_CFB64 | AES_FLAGS_ENCRYPT);
1111 }
1112
1113 static int atmel_aes_cfb64_decrypt(struct ablkcipher_request *req)
1114 {
1115 return atmel_aes_crypt(req, AES_FLAGS_CFB64);
1116 }
1117
1118 static int atmel_aes_cfb32_encrypt(struct ablkcipher_request *req)
1119 {
1120 return atmel_aes_crypt(req, AES_FLAGS_CFB32 | AES_FLAGS_ENCRYPT);
1121 }
1122
1123 static int atmel_aes_cfb32_decrypt(struct ablkcipher_request *req)
1124 {
1125 return atmel_aes_crypt(req, AES_FLAGS_CFB32);
1126 }
1127
1128 static int atmel_aes_cfb16_encrypt(struct ablkcipher_request *req)
1129 {
1130 return atmel_aes_crypt(req, AES_FLAGS_CFB16 | AES_FLAGS_ENCRYPT);
1131 }
1132
1133 static int atmel_aes_cfb16_decrypt(struct ablkcipher_request *req)
1134 {
1135 return atmel_aes_crypt(req, AES_FLAGS_CFB16);
1136 }
1137
1138 static int atmel_aes_cfb8_encrypt(struct ablkcipher_request *req)
1139 {
1140 return atmel_aes_crypt(req, AES_FLAGS_CFB8 | AES_FLAGS_ENCRYPT);
1141 }
1142
1143 static int atmel_aes_cfb8_decrypt(struct ablkcipher_request *req)
1144 {
1145 return atmel_aes_crypt(req, AES_FLAGS_CFB8);
1146 }
1147
1148 static int atmel_aes_ctr_encrypt(struct ablkcipher_request *req)
1149 {
1150 return atmel_aes_crypt(req, AES_FLAGS_CTR | AES_FLAGS_ENCRYPT);
1151 }
1152
1153 static int atmel_aes_ctr_decrypt(struct ablkcipher_request *req)
1154 {
1155 return atmel_aes_crypt(req, AES_FLAGS_CTR);
1156 }
1157
1158 static int atmel_aes_cra_init(struct crypto_tfm *tfm)
1159 {
1160 struct atmel_aes_ctx *ctx = crypto_tfm_ctx(tfm);
1161
1162 tfm->crt_ablkcipher.reqsize = sizeof(struct atmel_aes_reqctx);
1163 ctx->base.start = atmel_aes_start;
1164
1165 return 0;
1166 }
1167
1168 static int atmel_aes_ctr_cra_init(struct crypto_tfm *tfm)
1169 {
1170 struct atmel_aes_ctx *ctx = crypto_tfm_ctx(tfm);
1171
1172 tfm->crt_ablkcipher.reqsize = sizeof(struct atmel_aes_reqctx);
1173 ctx->base.start = atmel_aes_ctr_start;
1174
1175 return 0;
1176 }
1177
1178 static void atmel_aes_cra_exit(struct crypto_tfm *tfm)
1179 {
1180 }
1181
1182 static struct crypto_alg aes_algs[] = {
1183 {
1184 .cra_name = "ecb(aes)",
1185 .cra_driver_name = "atmel-ecb-aes",
1186 .cra_priority = ATMEL_AES_PRIORITY,
1187 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1188 .cra_blocksize = AES_BLOCK_SIZE,
1189 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1190 .cra_alignmask = 0xf,
1191 .cra_type = &crypto_ablkcipher_type,
1192 .cra_module = THIS_MODULE,
1193 .cra_init = atmel_aes_cra_init,
1194 .cra_exit = atmel_aes_cra_exit,
1195 .cra_u.ablkcipher = {
1196 .min_keysize = AES_MIN_KEY_SIZE,
1197 .max_keysize = AES_MAX_KEY_SIZE,
1198 .setkey = atmel_aes_setkey,
1199 .encrypt = atmel_aes_ecb_encrypt,
1200 .decrypt = atmel_aes_ecb_decrypt,
1201 }
1202 },
1203 {
1204 .cra_name = "cbc(aes)",
1205 .cra_driver_name = "atmel-cbc-aes",
1206 .cra_priority = ATMEL_AES_PRIORITY,
1207 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1208 .cra_blocksize = AES_BLOCK_SIZE,
1209 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1210 .cra_alignmask = 0xf,
1211 .cra_type = &crypto_ablkcipher_type,
1212 .cra_module = THIS_MODULE,
1213 .cra_init = atmel_aes_cra_init,
1214 .cra_exit = atmel_aes_cra_exit,
1215 .cra_u.ablkcipher = {
1216 .min_keysize = AES_MIN_KEY_SIZE,
1217 .max_keysize = AES_MAX_KEY_SIZE,
1218 .ivsize = AES_BLOCK_SIZE,
1219 .setkey = atmel_aes_setkey,
1220 .encrypt = atmel_aes_cbc_encrypt,
1221 .decrypt = atmel_aes_cbc_decrypt,
1222 }
1223 },
1224 {
1225 .cra_name = "ofb(aes)",
1226 .cra_driver_name = "atmel-ofb-aes",
1227 .cra_priority = ATMEL_AES_PRIORITY,
1228 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1229 .cra_blocksize = AES_BLOCK_SIZE,
1230 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1231 .cra_alignmask = 0xf,
1232 .cra_type = &crypto_ablkcipher_type,
1233 .cra_module = THIS_MODULE,
1234 .cra_init = atmel_aes_cra_init,
1235 .cra_exit = atmel_aes_cra_exit,
1236 .cra_u.ablkcipher = {
1237 .min_keysize = AES_MIN_KEY_SIZE,
1238 .max_keysize = AES_MAX_KEY_SIZE,
1239 .ivsize = AES_BLOCK_SIZE,
1240 .setkey = atmel_aes_setkey,
1241 .encrypt = atmel_aes_ofb_encrypt,
1242 .decrypt = atmel_aes_ofb_decrypt,
1243 }
1244 },
1245 {
1246 .cra_name = "cfb(aes)",
1247 .cra_driver_name = "atmel-cfb-aes",
1248 .cra_priority = ATMEL_AES_PRIORITY,
1249 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1250 .cra_blocksize = AES_BLOCK_SIZE,
1251 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1252 .cra_alignmask = 0xf,
1253 .cra_type = &crypto_ablkcipher_type,
1254 .cra_module = THIS_MODULE,
1255 .cra_init = atmel_aes_cra_init,
1256 .cra_exit = atmel_aes_cra_exit,
1257 .cra_u.ablkcipher = {
1258 .min_keysize = AES_MIN_KEY_SIZE,
1259 .max_keysize = AES_MAX_KEY_SIZE,
1260 .ivsize = AES_BLOCK_SIZE,
1261 .setkey = atmel_aes_setkey,
1262 .encrypt = atmel_aes_cfb_encrypt,
1263 .decrypt = atmel_aes_cfb_decrypt,
1264 }
1265 },
1266 {
1267 .cra_name = "cfb32(aes)",
1268 .cra_driver_name = "atmel-cfb32-aes",
1269 .cra_priority = ATMEL_AES_PRIORITY,
1270 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1271 .cra_blocksize = CFB32_BLOCK_SIZE,
1272 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1273 .cra_alignmask = 0x3,
1274 .cra_type = &crypto_ablkcipher_type,
1275 .cra_module = THIS_MODULE,
1276 .cra_init = atmel_aes_cra_init,
1277 .cra_exit = atmel_aes_cra_exit,
1278 .cra_u.ablkcipher = {
1279 .min_keysize = AES_MIN_KEY_SIZE,
1280 .max_keysize = AES_MAX_KEY_SIZE,
1281 .ivsize = AES_BLOCK_SIZE,
1282 .setkey = atmel_aes_setkey,
1283 .encrypt = atmel_aes_cfb32_encrypt,
1284 .decrypt = atmel_aes_cfb32_decrypt,
1285 }
1286 },
1287 {
1288 .cra_name = "cfb16(aes)",
1289 .cra_driver_name = "atmel-cfb16-aes",
1290 .cra_priority = ATMEL_AES_PRIORITY,
1291 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1292 .cra_blocksize = CFB16_BLOCK_SIZE,
1293 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1294 .cra_alignmask = 0x1,
1295 .cra_type = &crypto_ablkcipher_type,
1296 .cra_module = THIS_MODULE,
1297 .cra_init = atmel_aes_cra_init,
1298 .cra_exit = atmel_aes_cra_exit,
1299 .cra_u.ablkcipher = {
1300 .min_keysize = AES_MIN_KEY_SIZE,
1301 .max_keysize = AES_MAX_KEY_SIZE,
1302 .ivsize = AES_BLOCK_SIZE,
1303 .setkey = atmel_aes_setkey,
1304 .encrypt = atmel_aes_cfb16_encrypt,
1305 .decrypt = atmel_aes_cfb16_decrypt,
1306 }
1307 },
1308 {
1309 .cra_name = "cfb8(aes)",
1310 .cra_driver_name = "atmel-cfb8-aes",
1311 .cra_priority = ATMEL_AES_PRIORITY,
1312 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1313 .cra_blocksize = CFB8_BLOCK_SIZE,
1314 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1315 .cra_alignmask = 0x0,
1316 .cra_type = &crypto_ablkcipher_type,
1317 .cra_module = THIS_MODULE,
1318 .cra_init = atmel_aes_cra_init,
1319 .cra_exit = atmel_aes_cra_exit,
1320 .cra_u.ablkcipher = {
1321 .min_keysize = AES_MIN_KEY_SIZE,
1322 .max_keysize = AES_MAX_KEY_SIZE,
1323 .ivsize = AES_BLOCK_SIZE,
1324 .setkey = atmel_aes_setkey,
1325 .encrypt = atmel_aes_cfb8_encrypt,
1326 .decrypt = atmel_aes_cfb8_decrypt,
1327 }
1328 },
1329 {
1330 .cra_name = "ctr(aes)",
1331 .cra_driver_name = "atmel-ctr-aes",
1332 .cra_priority = ATMEL_AES_PRIORITY,
1333 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1334 .cra_blocksize = 1,
1335 .cra_ctxsize = sizeof(struct atmel_aes_ctr_ctx),
1336 .cra_alignmask = 0xf,
1337 .cra_type = &crypto_ablkcipher_type,
1338 .cra_module = THIS_MODULE,
1339 .cra_init = atmel_aes_ctr_cra_init,
1340 .cra_exit = atmel_aes_cra_exit,
1341 .cra_u.ablkcipher = {
1342 .min_keysize = AES_MIN_KEY_SIZE,
1343 .max_keysize = AES_MAX_KEY_SIZE,
1344 .ivsize = AES_BLOCK_SIZE,
1345 .setkey = atmel_aes_setkey,
1346 .encrypt = atmel_aes_ctr_encrypt,
1347 .decrypt = atmel_aes_ctr_decrypt,
1348 }
1349 },
1350 };
1351
1352 static struct crypto_alg aes_cfb64_alg = {
1353 .cra_name = "cfb64(aes)",
1354 .cra_driver_name = "atmel-cfb64-aes",
1355 .cra_priority = ATMEL_AES_PRIORITY,
1356 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1357 .cra_blocksize = CFB64_BLOCK_SIZE,
1358 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1359 .cra_alignmask = 0x7,
1360 .cra_type = &crypto_ablkcipher_type,
1361 .cra_module = THIS_MODULE,
1362 .cra_init = atmel_aes_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_cfb64_encrypt,
1370 .decrypt = atmel_aes_cfb64_decrypt,
1371 }
1372 };
1373
1374
1375 /* gcm aead functions */
1376
1377 static int atmel_aes_gcm_ghash(struct atmel_aes_dev *dd,
1378 const u32 *data, size_t datalen,
1379 const u32 *ghash_in, u32 *ghash_out,
1380 atmel_aes_fn_t resume);
1381 static int atmel_aes_gcm_ghash_init(struct atmel_aes_dev *dd);
1382 static int atmel_aes_gcm_ghash_finalize(struct atmel_aes_dev *dd);
1383
1384 static int atmel_aes_gcm_start(struct atmel_aes_dev *dd);
1385 static int atmel_aes_gcm_process(struct atmel_aes_dev *dd);
1386 static int atmel_aes_gcm_length(struct atmel_aes_dev *dd);
1387 static int atmel_aes_gcm_data(struct atmel_aes_dev *dd);
1388 static int atmel_aes_gcm_tag_init(struct atmel_aes_dev *dd);
1389 static int atmel_aes_gcm_tag(struct atmel_aes_dev *dd);
1390 static int atmel_aes_gcm_finalize(struct atmel_aes_dev *dd);
1391
1392 static inline struct atmel_aes_gcm_ctx *
1393 atmel_aes_gcm_ctx_cast(struct atmel_aes_base_ctx *ctx)
1394 {
1395 return container_of(ctx, struct atmel_aes_gcm_ctx, base);
1396 }
1397
1398 static int atmel_aes_gcm_ghash(struct atmel_aes_dev *dd,
1399 const u32 *data, size_t datalen,
1400 const u32 *ghash_in, u32 *ghash_out,
1401 atmel_aes_fn_t resume)
1402 {
1403 struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
1404
1405 dd->data = (u32 *)data;
1406 dd->datalen = datalen;
1407 ctx->ghash_in = ghash_in;
1408 ctx->ghash_out = ghash_out;
1409 ctx->ghash_resume = resume;
1410
1411 atmel_aes_write_ctrl(dd, false, NULL);
1412 return atmel_aes_wait_for_data_ready(dd, atmel_aes_gcm_ghash_init);
1413 }
1414
1415 static int atmel_aes_gcm_ghash_init(struct atmel_aes_dev *dd)
1416 {
1417 struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
1418
1419 /* Set the data length. */
1420 atmel_aes_write(dd, AES_AADLENR, dd->total);
1421 atmel_aes_write(dd, AES_CLENR, 0);
1422
1423 /* If needed, overwrite the GCM Intermediate Hash Word Registers */
1424 if (ctx->ghash_in)
1425 atmel_aes_write_block(dd, AES_GHASHR(0), ctx->ghash_in);
1426
1427 return atmel_aes_gcm_ghash_finalize(dd);
1428 }
1429
1430 static int atmel_aes_gcm_ghash_finalize(struct atmel_aes_dev *dd)
1431 {
1432 struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
1433 u32 isr;
1434
1435 /* Write data into the Input Data Registers. */
1436 while (dd->datalen > 0) {
1437 atmel_aes_write_block(dd, AES_IDATAR(0), dd->data);
1438 dd->data += 4;
1439 dd->datalen -= AES_BLOCK_SIZE;
1440
1441 isr = atmel_aes_read(dd, AES_ISR);
1442 if (!(isr & AES_INT_DATARDY)) {
1443 dd->resume = atmel_aes_gcm_ghash_finalize;
1444 atmel_aes_write(dd, AES_IER, AES_INT_DATARDY);
1445 return -EINPROGRESS;
1446 }
1447 }
1448
1449 /* Read the computed hash from GHASHRx. */
1450 atmel_aes_read_block(dd, AES_GHASHR(0), ctx->ghash_out);
1451
1452 return ctx->ghash_resume(dd);
1453 }
1454
1455
1456 static int atmel_aes_gcm_start(struct atmel_aes_dev *dd)
1457 {
1458 struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
1459 struct aead_request *req = aead_request_cast(dd->areq);
1460 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
1461 struct atmel_aes_reqctx *rctx = aead_request_ctx(req);
1462 size_t ivsize = crypto_aead_ivsize(tfm);
1463 size_t datalen, padlen;
1464 const void *iv = req->iv;
1465 u8 *data = dd->buf;
1466 int err;
1467
1468 atmel_aes_set_mode(dd, rctx);
1469
1470 err = atmel_aes_hw_init(dd);
1471 if (err)
1472 return atmel_aes_complete(dd, err);
1473
1474 if (likely(ivsize == 12)) {
1475 memcpy(ctx->j0, iv, ivsize);
1476 ctx->j0[3] = cpu_to_be32(1);
1477 return atmel_aes_gcm_process(dd);
1478 }
1479
1480 padlen = atmel_aes_padlen(ivsize, AES_BLOCK_SIZE);
1481 datalen = ivsize + padlen + AES_BLOCK_SIZE;
1482 if (datalen > dd->buflen)
1483 return atmel_aes_complete(dd, -EINVAL);
1484
1485 memcpy(data, iv, ivsize);
1486 memset(data + ivsize, 0, padlen + sizeof(u64));
1487 ((u64 *)(data + datalen))[-1] = cpu_to_be64(ivsize * 8);
1488
1489 return atmel_aes_gcm_ghash(dd, (const u32 *)data, datalen,
1490 NULL, ctx->j0, atmel_aes_gcm_process);
1491 }
1492
1493 static int atmel_aes_gcm_process(struct atmel_aes_dev *dd)
1494 {
1495 struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
1496 struct aead_request *req = aead_request_cast(dd->areq);
1497 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
1498 bool enc = atmel_aes_is_encrypt(dd);
1499 u32 authsize;
1500
1501 /* Compute text length. */
1502 authsize = crypto_aead_authsize(tfm);
1503 ctx->textlen = req->cryptlen - (enc ? 0 : authsize);
1504
1505 /*
1506 * According to tcrypt test suite, the GCM Automatic Tag Generation
1507 * fails when both the message and its associated data are empty.
1508 */
1509 if (likely(req->assoclen != 0 || ctx->textlen != 0))
1510 dd->flags |= AES_FLAGS_GTAGEN;
1511
1512 atmel_aes_write_ctrl(dd, false, NULL);
1513 return atmel_aes_wait_for_data_ready(dd, atmel_aes_gcm_length);
1514 }
1515
1516 static int atmel_aes_gcm_length(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 u32 j0_lsw, *j0 = ctx->j0;
1521 size_t padlen;
1522
1523 /* Write incr32(J0) into IV. */
1524 j0_lsw = j0[3];
1525 j0[3] = cpu_to_be32(be32_to_cpu(j0[3]) + 1);
1526 atmel_aes_write_block(dd, AES_IVR(0), j0);
1527 j0[3] = j0_lsw;
1528
1529 /* Set aad and text lengths. */
1530 atmel_aes_write(dd, AES_AADLENR, req->assoclen);
1531 atmel_aes_write(dd, AES_CLENR, ctx->textlen);
1532
1533 /* Check whether AAD are present. */
1534 if (unlikely(req->assoclen == 0)) {
1535 dd->datalen = 0;
1536 return atmel_aes_gcm_data(dd);
1537 }
1538
1539 /* Copy assoc data and add padding. */
1540 padlen = atmel_aes_padlen(req->assoclen, AES_BLOCK_SIZE);
1541 if (unlikely(req->assoclen + padlen > dd->buflen))
1542 return atmel_aes_complete(dd, -EINVAL);
1543 sg_copy_to_buffer(req->src, sg_nents(req->src), dd->buf, req->assoclen);
1544
1545 /* Write assoc data into the Input Data register. */
1546 dd->data = (u32 *)dd->buf;
1547 dd->datalen = req->assoclen + padlen;
1548 return atmel_aes_gcm_data(dd);
1549 }
1550
1551 static int atmel_aes_gcm_data(struct atmel_aes_dev *dd)
1552 {
1553 struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
1554 struct aead_request *req = aead_request_cast(dd->areq);
1555 bool use_dma = (ctx->textlen >= ATMEL_AES_DMA_THRESHOLD);
1556 struct scatterlist *src, *dst;
1557 u32 isr, mr;
1558
1559 /* Write AAD first. */
1560 while (dd->datalen > 0) {
1561 atmel_aes_write_block(dd, AES_IDATAR(0), dd->data);
1562 dd->data += 4;
1563 dd->datalen -= AES_BLOCK_SIZE;
1564
1565 isr = atmel_aes_read(dd, AES_ISR);
1566 if (!(isr & AES_INT_DATARDY)) {
1567 dd->resume = atmel_aes_gcm_data;
1568 atmel_aes_write(dd, AES_IER, AES_INT_DATARDY);
1569 return -EINPROGRESS;
1570 }
1571 }
1572
1573 /* GMAC only. */
1574 if (unlikely(ctx->textlen == 0))
1575 return atmel_aes_gcm_tag_init(dd);
1576
1577 /* Prepare src and dst scatter lists to transfer cipher/plain texts */
1578 src = scatterwalk_ffwd(ctx->src, req->src, req->assoclen);
1579 dst = ((req->src == req->dst) ? src :
1580 scatterwalk_ffwd(ctx->dst, req->dst, req->assoclen));
1581
1582 if (use_dma) {
1583 /* Update the Mode Register for DMA transfers. */
1584 mr = atmel_aes_read(dd, AES_MR);
1585 mr &= ~(AES_MR_SMOD_MASK | AES_MR_DUALBUFF);
1586 mr |= AES_MR_SMOD_IDATAR0;
1587 if (dd->caps.has_dualbuff)
1588 mr |= AES_MR_DUALBUFF;
1589 atmel_aes_write(dd, AES_MR, mr);
1590
1591 return atmel_aes_dma_start(dd, src, dst, ctx->textlen,
1592 atmel_aes_gcm_tag_init);
1593 }
1594
1595 return atmel_aes_cpu_start(dd, src, dst, ctx->textlen,
1596 atmel_aes_gcm_tag_init);
1597 }
1598
1599 static int atmel_aes_gcm_tag_init(struct atmel_aes_dev *dd)
1600 {
1601 struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
1602 struct aead_request *req = aead_request_cast(dd->areq);
1603 u64 *data = dd->buf;
1604
1605 if (likely(dd->flags & AES_FLAGS_GTAGEN)) {
1606 if (!(atmel_aes_read(dd, AES_ISR) & AES_INT_TAGRDY)) {
1607 dd->resume = atmel_aes_gcm_tag_init;
1608 atmel_aes_write(dd, AES_IER, AES_INT_TAGRDY);
1609 return -EINPROGRESS;
1610 }
1611
1612 return atmel_aes_gcm_finalize(dd);
1613 }
1614
1615 /* Read the GCM Intermediate Hash Word Registers. */
1616 atmel_aes_read_block(dd, AES_GHASHR(0), ctx->ghash);
1617
1618 data[0] = cpu_to_be64(req->assoclen * 8);
1619 data[1] = cpu_to_be64(ctx->textlen * 8);
1620
1621 return atmel_aes_gcm_ghash(dd, (const u32 *)data, AES_BLOCK_SIZE,
1622 ctx->ghash, ctx->ghash, atmel_aes_gcm_tag);
1623 }
1624
1625 static int atmel_aes_gcm_tag(struct atmel_aes_dev *dd)
1626 {
1627 struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
1628 unsigned long flags;
1629
1630 /*
1631 * Change mode to CTR to complete the tag generation.
1632 * Use J0 as Initialization Vector.
1633 */
1634 flags = dd->flags;
1635 dd->flags &= ~(AES_FLAGS_OPMODE_MASK | AES_FLAGS_GTAGEN);
1636 dd->flags |= AES_FLAGS_CTR;
1637 atmel_aes_write_ctrl(dd, false, ctx->j0);
1638 dd->flags = flags;
1639
1640 atmel_aes_write_block(dd, AES_IDATAR(0), ctx->ghash);
1641 return atmel_aes_wait_for_data_ready(dd, atmel_aes_gcm_finalize);
1642 }
1643
1644 static int atmel_aes_gcm_finalize(struct atmel_aes_dev *dd)
1645 {
1646 struct atmel_aes_gcm_ctx *ctx = atmel_aes_gcm_ctx_cast(dd->ctx);
1647 struct aead_request *req = aead_request_cast(dd->areq);
1648 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
1649 bool enc = atmel_aes_is_encrypt(dd);
1650 u32 offset, authsize, itag[4], *otag = ctx->tag;
1651 int err;
1652
1653 /* Read the computed tag. */
1654 if (likely(dd->flags & AES_FLAGS_GTAGEN))
1655 atmel_aes_read_block(dd, AES_TAGR(0), ctx->tag);
1656 else
1657 atmel_aes_read_block(dd, AES_ODATAR(0), ctx->tag);
1658
1659 offset = req->assoclen + ctx->textlen;
1660 authsize = crypto_aead_authsize(tfm);
1661 if (enc) {
1662 scatterwalk_map_and_copy(otag, req->dst, offset, authsize, 1);
1663 err = 0;
1664 } else {
1665 scatterwalk_map_and_copy(itag, req->src, offset, authsize, 0);
1666 err = crypto_memneq(itag, otag, authsize) ? -EBADMSG : 0;
1667 }
1668
1669 return atmel_aes_complete(dd, err);
1670 }
1671
1672 static int atmel_aes_gcm_crypt(struct aead_request *req,
1673 unsigned long mode)
1674 {
1675 struct atmel_aes_base_ctx *ctx;
1676 struct atmel_aes_reqctx *rctx;
1677 struct atmel_aes_dev *dd;
1678
1679 ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
1680 ctx->block_size = AES_BLOCK_SIZE;
1681
1682 dd = atmel_aes_find_dev(ctx);
1683 if (!dd)
1684 return -ENODEV;
1685
1686 rctx = aead_request_ctx(req);
1687 rctx->mode = AES_FLAGS_GCM | mode;
1688
1689 return atmel_aes_handle_queue(dd, &req->base);
1690 }
1691
1692 static int atmel_aes_gcm_setkey(struct crypto_aead *tfm, const u8 *key,
1693 unsigned int keylen)
1694 {
1695 struct atmel_aes_base_ctx *ctx = crypto_aead_ctx(tfm);
1696
1697 if (keylen != AES_KEYSIZE_256 &&
1698 keylen != AES_KEYSIZE_192 &&
1699 keylen != AES_KEYSIZE_128) {
1700 crypto_aead_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
1701 return -EINVAL;
1702 }
1703
1704 memcpy(ctx->key, key, keylen);
1705 ctx->keylen = keylen;
1706
1707 return 0;
1708 }
1709
1710 static int atmel_aes_gcm_setauthsize(struct crypto_aead *tfm,
1711 unsigned int authsize)
1712 {
1713 /* Same as crypto_gcm_authsize() from crypto/gcm.c */
1714 switch (authsize) {
1715 case 4:
1716 case 8:
1717 case 12:
1718 case 13:
1719 case 14:
1720 case 15:
1721 case 16:
1722 break;
1723 default:
1724 return -EINVAL;
1725 }
1726
1727 return 0;
1728 }
1729
1730 static int atmel_aes_gcm_encrypt(struct aead_request *req)
1731 {
1732 return atmel_aes_gcm_crypt(req, AES_FLAGS_ENCRYPT);
1733 }
1734
1735 static int atmel_aes_gcm_decrypt(struct aead_request *req)
1736 {
1737 return atmel_aes_gcm_crypt(req, 0);
1738 }
1739
1740 static int atmel_aes_gcm_init(struct crypto_aead *tfm)
1741 {
1742 struct atmel_aes_gcm_ctx *ctx = crypto_aead_ctx(tfm);
1743
1744 crypto_aead_set_reqsize(tfm, sizeof(struct atmel_aes_reqctx));
1745 ctx->base.start = atmel_aes_gcm_start;
1746
1747 return 0;
1748 }
1749
1750 static void atmel_aes_gcm_exit(struct crypto_aead *tfm)
1751 {
1752
1753 }
1754
1755 static struct aead_alg aes_gcm_alg = {
1756 .setkey = atmel_aes_gcm_setkey,
1757 .setauthsize = atmel_aes_gcm_setauthsize,
1758 .encrypt = atmel_aes_gcm_encrypt,
1759 .decrypt = atmel_aes_gcm_decrypt,
1760 .init = atmel_aes_gcm_init,
1761 .exit = atmel_aes_gcm_exit,
1762 .ivsize = 12,
1763 .maxauthsize = AES_BLOCK_SIZE,
1764
1765 .base = {
1766 .cra_name = "gcm(aes)",
1767 .cra_driver_name = "atmel-gcm-aes",
1768 .cra_priority = ATMEL_AES_PRIORITY,
1769 .cra_flags = CRYPTO_ALG_ASYNC,
1770 .cra_blocksize = 1,
1771 .cra_ctxsize = sizeof(struct atmel_aes_gcm_ctx),
1772 .cra_alignmask = 0xf,
1773 .cra_module = THIS_MODULE,
1774 },
1775 };
1776
1777
1778 /* Probe functions */
1779
1780 static int atmel_aes_buff_init(struct atmel_aes_dev *dd)
1781 {
1782 dd->buf = (void *)__get_free_pages(GFP_KERNEL, ATMEL_AES_BUFFER_ORDER);
1783 dd->buflen = ATMEL_AES_BUFFER_SIZE;
1784 dd->buflen &= ~(AES_BLOCK_SIZE - 1);
1785
1786 if (!dd->buf) {
1787 dev_err(dd->dev, "unable to alloc pages.\n");
1788 return -ENOMEM;
1789 }
1790
1791 return 0;
1792 }
1793
1794 static void atmel_aes_buff_cleanup(struct atmel_aes_dev *dd)
1795 {
1796 free_page((unsigned long)dd->buf);
1797 }
1798
1799 static bool atmel_aes_filter(struct dma_chan *chan, void *slave)
1800 {
1801 struct at_dma_slave *sl = slave;
1802
1803 if (sl && sl->dma_dev == chan->device->dev) {
1804 chan->private = sl;
1805 return true;
1806 } else {
1807 return false;
1808 }
1809 }
1810
1811 static int atmel_aes_dma_init(struct atmel_aes_dev *dd,
1812 struct crypto_platform_data *pdata)
1813 {
1814 struct at_dma_slave *slave;
1815 int err = -ENOMEM;
1816 dma_cap_mask_t mask;
1817
1818 dma_cap_zero(mask);
1819 dma_cap_set(DMA_SLAVE, mask);
1820
1821 /* Try to grab 2 DMA channels */
1822 slave = &pdata->dma_slave->rxdata;
1823 dd->src.chan = dma_request_slave_channel_compat(mask, atmel_aes_filter,
1824 slave, dd->dev, "tx");
1825 if (!dd->src.chan)
1826 goto err_dma_in;
1827
1828 slave = &pdata->dma_slave->txdata;
1829 dd->dst.chan = dma_request_slave_channel_compat(mask, atmel_aes_filter,
1830 slave, dd->dev, "rx");
1831 if (!dd->dst.chan)
1832 goto err_dma_out;
1833
1834 return 0;
1835
1836 err_dma_out:
1837 dma_release_channel(dd->src.chan);
1838 err_dma_in:
1839 dev_warn(dd->dev, "no DMA channel available\n");
1840 return err;
1841 }
1842
1843 static void atmel_aes_dma_cleanup(struct atmel_aes_dev *dd)
1844 {
1845 dma_release_channel(dd->dst.chan);
1846 dma_release_channel(dd->src.chan);
1847 }
1848
1849 static void atmel_aes_queue_task(unsigned long data)
1850 {
1851 struct atmel_aes_dev *dd = (struct atmel_aes_dev *)data;
1852
1853 atmel_aes_handle_queue(dd, NULL);
1854 }
1855
1856 static void atmel_aes_done_task(unsigned long data)
1857 {
1858 struct atmel_aes_dev *dd = (struct atmel_aes_dev *)data;
1859
1860 dd->is_async = true;
1861 (void)dd->resume(dd);
1862 }
1863
1864 static irqreturn_t atmel_aes_irq(int irq, void *dev_id)
1865 {
1866 struct atmel_aes_dev *aes_dd = dev_id;
1867 u32 reg;
1868
1869 reg = atmel_aes_read(aes_dd, AES_ISR);
1870 if (reg & atmel_aes_read(aes_dd, AES_IMR)) {
1871 atmel_aes_write(aes_dd, AES_IDR, reg);
1872 if (AES_FLAGS_BUSY & aes_dd->flags)
1873 tasklet_schedule(&aes_dd->done_task);
1874 else
1875 dev_warn(aes_dd->dev, "AES interrupt when no active requests.\n");
1876 return IRQ_HANDLED;
1877 }
1878
1879 return IRQ_NONE;
1880 }
1881
1882 static void atmel_aes_unregister_algs(struct atmel_aes_dev *dd)
1883 {
1884 int i;
1885
1886 if (dd->caps.has_gcm)
1887 crypto_unregister_aead(&aes_gcm_alg);
1888
1889 if (dd->caps.has_cfb64)
1890 crypto_unregister_alg(&aes_cfb64_alg);
1891
1892 for (i = 0; i < ARRAY_SIZE(aes_algs); i++)
1893 crypto_unregister_alg(&aes_algs[i]);
1894 }
1895
1896 static int atmel_aes_register_algs(struct atmel_aes_dev *dd)
1897 {
1898 int err, i, j;
1899
1900 for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
1901 err = crypto_register_alg(&aes_algs[i]);
1902 if (err)
1903 goto err_aes_algs;
1904 }
1905
1906 if (dd->caps.has_cfb64) {
1907 err = crypto_register_alg(&aes_cfb64_alg);
1908 if (err)
1909 goto err_aes_cfb64_alg;
1910 }
1911
1912 if (dd->caps.has_gcm) {
1913 err = crypto_register_aead(&aes_gcm_alg);
1914 if (err)
1915 goto err_aes_gcm_alg;
1916 }
1917
1918 return 0;
1919
1920 err_aes_gcm_alg:
1921 crypto_unregister_alg(&aes_cfb64_alg);
1922 err_aes_cfb64_alg:
1923 i = ARRAY_SIZE(aes_algs);
1924 err_aes_algs:
1925 for (j = 0; j < i; j++)
1926 crypto_unregister_alg(&aes_algs[j]);
1927
1928 return err;
1929 }
1930
1931 static void atmel_aes_get_cap(struct atmel_aes_dev *dd)
1932 {
1933 dd->caps.has_dualbuff = 0;
1934 dd->caps.has_cfb64 = 0;
1935 dd->caps.has_ctr32 = 0;
1936 dd->caps.has_gcm = 0;
1937 dd->caps.max_burst_size = 1;
1938
1939 /* keep only major version number */
1940 switch (dd->hw_version & 0xff0) {
1941 case 0x500:
1942 dd->caps.has_dualbuff = 1;
1943 dd->caps.has_cfb64 = 1;
1944 dd->caps.has_ctr32 = 1;
1945 dd->caps.has_gcm = 1;
1946 dd->caps.max_burst_size = 4;
1947 break;
1948 case 0x200:
1949 dd->caps.has_dualbuff = 1;
1950 dd->caps.has_cfb64 = 1;
1951 dd->caps.has_ctr32 = 1;
1952 dd->caps.has_gcm = 1;
1953 dd->caps.max_burst_size = 4;
1954 break;
1955 case 0x130:
1956 dd->caps.has_dualbuff = 1;
1957 dd->caps.has_cfb64 = 1;
1958 dd->caps.max_burst_size = 4;
1959 break;
1960 case 0x120:
1961 break;
1962 default:
1963 dev_warn(dd->dev,
1964 "Unmanaged aes version, set minimum capabilities\n");
1965 break;
1966 }
1967 }
1968
1969 #if defined(CONFIG_OF)
1970 static const struct of_device_id atmel_aes_dt_ids[] = {
1971 { .compatible = "atmel,at91sam9g46-aes" },
1972 { /* sentinel */ }
1973 };
1974 MODULE_DEVICE_TABLE(of, atmel_aes_dt_ids);
1975
1976 static struct crypto_platform_data *atmel_aes_of_init(struct platform_device *pdev)
1977 {
1978 struct device_node *np = pdev->dev.of_node;
1979 struct crypto_platform_data *pdata;
1980
1981 if (!np) {
1982 dev_err(&pdev->dev, "device node not found\n");
1983 return ERR_PTR(-EINVAL);
1984 }
1985
1986 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
1987 if (!pdata) {
1988 dev_err(&pdev->dev, "could not allocate memory for pdata\n");
1989 return ERR_PTR(-ENOMEM);
1990 }
1991
1992 pdata->dma_slave = devm_kzalloc(&pdev->dev,
1993 sizeof(*(pdata->dma_slave)),
1994 GFP_KERNEL);
1995 if (!pdata->dma_slave) {
1996 dev_err(&pdev->dev, "could not allocate memory for dma_slave\n");
1997 devm_kfree(&pdev->dev, pdata);
1998 return ERR_PTR(-ENOMEM);
1999 }
2000
2001 return pdata;
2002 }
2003 #else
2004 static inline struct crypto_platform_data *atmel_aes_of_init(struct platform_device *pdev)
2005 {
2006 return ERR_PTR(-EINVAL);
2007 }
2008 #endif
2009
2010 static int atmel_aes_probe(struct platform_device *pdev)
2011 {
2012 struct atmel_aes_dev *aes_dd;
2013 struct crypto_platform_data *pdata;
2014 struct device *dev = &pdev->dev;
2015 struct resource *aes_res;
2016 int err;
2017
2018 pdata = pdev->dev.platform_data;
2019 if (!pdata) {
2020 pdata = atmel_aes_of_init(pdev);
2021 if (IS_ERR(pdata)) {
2022 err = PTR_ERR(pdata);
2023 goto aes_dd_err;
2024 }
2025 }
2026
2027 if (!pdata->dma_slave) {
2028 err = -ENXIO;
2029 goto aes_dd_err;
2030 }
2031
2032 aes_dd = devm_kzalloc(&pdev->dev, sizeof(*aes_dd), GFP_KERNEL);
2033 if (aes_dd == NULL) {
2034 dev_err(dev, "unable to alloc data struct.\n");
2035 err = -ENOMEM;
2036 goto aes_dd_err;
2037 }
2038
2039 aes_dd->dev = dev;
2040
2041 platform_set_drvdata(pdev, aes_dd);
2042
2043 INIT_LIST_HEAD(&aes_dd->list);
2044 spin_lock_init(&aes_dd->lock);
2045
2046 tasklet_init(&aes_dd->done_task, atmel_aes_done_task,
2047 (unsigned long)aes_dd);
2048 tasklet_init(&aes_dd->queue_task, atmel_aes_queue_task,
2049 (unsigned long)aes_dd);
2050
2051 crypto_init_queue(&aes_dd->queue, ATMEL_AES_QUEUE_LENGTH);
2052
2053 aes_dd->irq = -1;
2054
2055 /* Get the base address */
2056 aes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2057 if (!aes_res) {
2058 dev_err(dev, "no MEM resource info\n");
2059 err = -ENODEV;
2060 goto res_err;
2061 }
2062 aes_dd->phys_base = aes_res->start;
2063
2064 /* Get the IRQ */
2065 aes_dd->irq = platform_get_irq(pdev, 0);
2066 if (aes_dd->irq < 0) {
2067 dev_err(dev, "no IRQ resource info\n");
2068 err = aes_dd->irq;
2069 goto res_err;
2070 }
2071
2072 err = devm_request_irq(&pdev->dev, aes_dd->irq, atmel_aes_irq,
2073 IRQF_SHARED, "atmel-aes", aes_dd);
2074 if (err) {
2075 dev_err(dev, "unable to request aes irq.\n");
2076 goto res_err;
2077 }
2078
2079 /* Initializing the clock */
2080 aes_dd->iclk = devm_clk_get(&pdev->dev, "aes_clk");
2081 if (IS_ERR(aes_dd->iclk)) {
2082 dev_err(dev, "clock initialization failed.\n");
2083 err = PTR_ERR(aes_dd->iclk);
2084 goto res_err;
2085 }
2086
2087 aes_dd->io_base = devm_ioremap_resource(&pdev->dev, aes_res);
2088 if (!aes_dd->io_base) {
2089 dev_err(dev, "can't ioremap\n");
2090 err = -ENOMEM;
2091 goto res_err;
2092 }
2093
2094 err = clk_prepare(aes_dd->iclk);
2095 if (err)
2096 goto res_err;
2097
2098 err = atmel_aes_hw_version_init(aes_dd);
2099 if (err)
2100 goto iclk_unprepare;
2101
2102 atmel_aes_get_cap(aes_dd);
2103
2104 err = atmel_aes_buff_init(aes_dd);
2105 if (err)
2106 goto err_aes_buff;
2107
2108 err = atmel_aes_dma_init(aes_dd, pdata);
2109 if (err)
2110 goto err_aes_dma;
2111
2112 spin_lock(&atmel_aes.lock);
2113 list_add_tail(&aes_dd->list, &atmel_aes.dev_list);
2114 spin_unlock(&atmel_aes.lock);
2115
2116 err = atmel_aes_register_algs(aes_dd);
2117 if (err)
2118 goto err_algs;
2119
2120 dev_info(dev, "Atmel AES - Using %s, %s for DMA transfers\n",
2121 dma_chan_name(aes_dd->src.chan),
2122 dma_chan_name(aes_dd->dst.chan));
2123
2124 return 0;
2125
2126 err_algs:
2127 spin_lock(&atmel_aes.lock);
2128 list_del(&aes_dd->list);
2129 spin_unlock(&atmel_aes.lock);
2130 atmel_aes_dma_cleanup(aes_dd);
2131 err_aes_dma:
2132 atmel_aes_buff_cleanup(aes_dd);
2133 err_aes_buff:
2134 iclk_unprepare:
2135 clk_unprepare(aes_dd->iclk);
2136 res_err:
2137 tasklet_kill(&aes_dd->done_task);
2138 tasklet_kill(&aes_dd->queue_task);
2139 aes_dd_err:
2140 dev_err(dev, "initialization failed.\n");
2141
2142 return err;
2143 }
2144
2145 static int atmel_aes_remove(struct platform_device *pdev)
2146 {
2147 static struct atmel_aes_dev *aes_dd;
2148
2149 aes_dd = platform_get_drvdata(pdev);
2150 if (!aes_dd)
2151 return -ENODEV;
2152 spin_lock(&atmel_aes.lock);
2153 list_del(&aes_dd->list);
2154 spin_unlock(&atmel_aes.lock);
2155
2156 atmel_aes_unregister_algs(aes_dd);
2157
2158 tasklet_kill(&aes_dd->done_task);
2159 tasklet_kill(&aes_dd->queue_task);
2160
2161 atmel_aes_dma_cleanup(aes_dd);
2162 atmel_aes_buff_cleanup(aes_dd);
2163
2164 clk_unprepare(aes_dd->iclk);
2165
2166 return 0;
2167 }
2168
2169 static struct platform_driver atmel_aes_driver = {
2170 .probe = atmel_aes_probe,
2171 .remove = atmel_aes_remove,
2172 .driver = {
2173 .name = "atmel_aes",
2174 .of_match_table = of_match_ptr(atmel_aes_dt_ids),
2175 },
2176 };
2177
2178 module_platform_driver(atmel_aes_driver);
2179
2180 MODULE_DESCRIPTION("Atmel AES hw acceleration support.");
2181 MODULE_LICENSE("GPL v2");
2182 MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
Linux kernel - Deliverables
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