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Merge tag 'regmap-v3.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[linux-2.6.git] / drivers / crypto / atmel-aes.c
blobc1efd910d97b0a663a06d8f5c50fa75bfdda878b
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/delay.h>
34 #include <linux/crypto.h>
35 #include <linux/cryptohash.h>
36 #include <crypto/scatterwalk.h>
37 #include <crypto/algapi.h>
38 #include <crypto/aes.h>
39 #include <crypto/hash.h>
40 #include <crypto/internal/hash.h>
41 #include <linux/platform_data/crypto-atmel.h>
42 #include "atmel-aes-regs.h"
43
44 #define CFB8_BLOCK_SIZE 1
45 #define CFB16_BLOCK_SIZE 2
46 #define CFB32_BLOCK_SIZE 4
47 #define CFB64_BLOCK_SIZE 8
48
49 /* AES flags */
50 #define AES_FLAGS_MODE_MASK 0x03ff
51 #define AES_FLAGS_ENCRYPT BIT(0)
52 #define AES_FLAGS_CBC BIT(1)
53 #define AES_FLAGS_CFB BIT(2)
54 #define AES_FLAGS_CFB8 BIT(3)
55 #define AES_FLAGS_CFB16 BIT(4)
56 #define AES_FLAGS_CFB32 BIT(5)
57 #define AES_FLAGS_CFB64 BIT(6)
58 #define AES_FLAGS_CFB128 BIT(7)
59 #define AES_FLAGS_OFB BIT(8)
60 #define AES_FLAGS_CTR BIT(9)
61
62 #define AES_FLAGS_INIT BIT(16)
63 #define AES_FLAGS_DMA BIT(17)
64 #define AES_FLAGS_BUSY BIT(18)
65 #define AES_FLAGS_FAST BIT(19)
66
67 #define ATMEL_AES_QUEUE_LENGTH 50
68
69 #define ATMEL_AES_DMA_THRESHOLD 16
70
71
72 struct atmel_aes_caps {
73 bool has_dualbuff;
74 bool has_cfb64;
75 u32 max_burst_size;
76 };
77
78 struct atmel_aes_dev;
79
80 struct atmel_aes_ctx {
81 struct atmel_aes_dev *dd;
82
83 int keylen;
84 u32 key[AES_KEYSIZE_256 / sizeof(u32)];
85
86 u16 block_size;
87 };
88
89 struct atmel_aes_reqctx {
90 unsigned long mode;
91 };
92
93 struct atmel_aes_dma {
94 struct dma_chan *chan;
95 struct dma_slave_config dma_conf;
96 };
97
98 struct atmel_aes_dev {
99 struct list_head list;
100 unsigned long phys_base;
101 void __iomem *io_base;
102
103 struct atmel_aes_ctx *ctx;
104 struct device *dev;
105 struct clk *iclk;
106 int irq;
107
108 unsigned long flags;
109 int err;
110
111 spinlock_t lock;
112 struct crypto_queue queue;
113
114 struct tasklet_struct done_task;
115 struct tasklet_struct queue_task;
116
117 struct ablkcipher_request *req;
118 size_t total;
119
120 struct scatterlist *in_sg;
121 unsigned int nb_in_sg;
122 size_t in_offset;
123 struct scatterlist *out_sg;
124 unsigned int nb_out_sg;
125 size_t out_offset;
126
127 size_t bufcnt;
128 size_t buflen;
129 size_t dma_size;
130
131 void *buf_in;
132 int dma_in;
133 dma_addr_t dma_addr_in;
134 struct atmel_aes_dma dma_lch_in;
135
136 void *buf_out;
137 int dma_out;
138 dma_addr_t dma_addr_out;
139 struct atmel_aes_dma dma_lch_out;
140
141 struct atmel_aes_caps caps;
142
143 u32 hw_version;
144 };
145
146 struct atmel_aes_drv {
147 struct list_head dev_list;
148 spinlock_t lock;
149 };
150
151 static struct atmel_aes_drv atmel_aes = {
152 .dev_list = LIST_HEAD_INIT(atmel_aes.dev_list),
153 .lock = __SPIN_LOCK_UNLOCKED(atmel_aes.lock),
154 };
155
156 static int atmel_aes_sg_length(struct ablkcipher_request *req,
157 struct scatterlist *sg)
158 {
159 unsigned int total = req->nbytes;
160 int sg_nb;
161 unsigned int len;
162 struct scatterlist *sg_list;
163
164 sg_nb = 0;
165 sg_list = sg;
166 total = req->nbytes;
167
168 while (total) {
169 len = min(sg_list->length, total);
170
171 sg_nb++;
172 total -= len;
173
174 sg_list = sg_next(sg_list);
175 if (!sg_list)
176 total = 0;
177 }
178
179 return sg_nb;
180 }
181
182 static int atmel_aes_sg_copy(struct scatterlist **sg, size_t *offset,
183 void *buf, size_t buflen, size_t total, int out)
184 {
185 unsigned int count, off = 0;
186
187 while (buflen && total) {
188 count = min((*sg)->length - *offset, total);
189 count = min(count, buflen);
190
191 if (!count)
192 return off;
193
194 scatterwalk_map_and_copy(buf + off, *sg, *offset, count, out);
195
196 off += count;
197 buflen -= count;
198 *offset += count;
199 total -= count;
200
201 if (*offset == (*sg)->length) {
202 *sg = sg_next(*sg);
203 if (*sg)
204 *offset = 0;
205 else
206 total = 0;
207 }
208 }
209
210 return off;
211 }
212
213 static inline u32 atmel_aes_read(struct atmel_aes_dev *dd, u32 offset)
214 {
215 return readl_relaxed(dd->io_base + offset);
216 }
217
218 static inline void atmel_aes_write(struct atmel_aes_dev *dd,
219 u32 offset, u32 value)
220 {
221 writel_relaxed(value, dd->io_base + offset);
222 }
223
224 static void atmel_aes_read_n(struct atmel_aes_dev *dd, u32 offset,
225 u32 *value, int count)
226 {
227 for (; count--; value++, offset += 4)
228 *value = atmel_aes_read(dd, offset);
229 }
230
231 static void atmel_aes_write_n(struct atmel_aes_dev *dd, u32 offset,
232 u32 *value, int count)
233 {
234 for (; count--; value++, offset += 4)
235 atmel_aes_write(dd, offset, *value);
236 }
237
238 static struct atmel_aes_dev *atmel_aes_find_dev(struct atmel_aes_ctx *ctx)
239 {
240 struct atmel_aes_dev *aes_dd = NULL;
241 struct atmel_aes_dev *tmp;
242
243 spin_lock_bh(&atmel_aes.lock);
244 if (!ctx->dd) {
245 list_for_each_entry(tmp, &atmel_aes.dev_list, list) {
246 aes_dd = tmp;
247 break;
248 }
249 ctx->dd = aes_dd;
250 } else {
251 aes_dd = ctx->dd;
252 }
253
254 spin_unlock_bh(&atmel_aes.lock);
255
256 return aes_dd;
257 }
258
259 static int atmel_aes_hw_init(struct atmel_aes_dev *dd)
260 {
261 clk_prepare_enable(dd->iclk);
262
263 if (!(dd->flags & AES_FLAGS_INIT)) {
264 atmel_aes_write(dd, AES_CR, AES_CR_SWRST);
265 atmel_aes_write(dd, AES_MR, 0xE << AES_MR_CKEY_OFFSET);
266 dd->flags |= AES_FLAGS_INIT;
267 dd->err = 0;
268 }
269
270 return 0;
271 }
272
273 static inline unsigned int atmel_aes_get_version(struct atmel_aes_dev *dd)
274 {
275 return atmel_aes_read(dd, AES_HW_VERSION) & 0x00000fff;
276 }
277
278 static void atmel_aes_hw_version_init(struct atmel_aes_dev *dd)
279 {
280 atmel_aes_hw_init(dd);
281
282 dd->hw_version = atmel_aes_get_version(dd);
283
284 dev_info(dd->dev,
285 "version: 0x%x\n", dd->hw_version);
286
287 clk_disable_unprepare(dd->iclk);
288 }
289
290 static void atmel_aes_finish_req(struct atmel_aes_dev *dd, int err)
291 {
292 struct ablkcipher_request *req = dd->req;
293
294 clk_disable_unprepare(dd->iclk);
295 dd->flags &= ~AES_FLAGS_BUSY;
296
297 req->base.complete(&req->base, err);
298 }
299
300 static void atmel_aes_dma_callback(void *data)
301 {
302 struct atmel_aes_dev *dd = data;
303
304 /* dma_lch_out - completed */
305 tasklet_schedule(&dd->done_task);
306 }
307
308 static int atmel_aes_crypt_dma(struct atmel_aes_dev *dd,
309 dma_addr_t dma_addr_in, dma_addr_t dma_addr_out, int length)
310 {
311 struct scatterlist sg[2];
312 struct dma_async_tx_descriptor *in_desc, *out_desc;
313
314 dd->dma_size = length;
315
316 if (!(dd->flags & AES_FLAGS_FAST)) {
317 dma_sync_single_for_device(dd->dev, dma_addr_in, length,
318 DMA_TO_DEVICE);
319 }
320
321 if (dd->flags & AES_FLAGS_CFB8) {
322 dd->dma_lch_in.dma_conf.dst_addr_width =
323 DMA_SLAVE_BUSWIDTH_1_BYTE;
324 dd->dma_lch_out.dma_conf.src_addr_width =
325 DMA_SLAVE_BUSWIDTH_1_BYTE;
326 } else if (dd->flags & AES_FLAGS_CFB16) {
327 dd->dma_lch_in.dma_conf.dst_addr_width =
328 DMA_SLAVE_BUSWIDTH_2_BYTES;
329 dd->dma_lch_out.dma_conf.src_addr_width =
330 DMA_SLAVE_BUSWIDTH_2_BYTES;
331 } else {
332 dd->dma_lch_in.dma_conf.dst_addr_width =
333 DMA_SLAVE_BUSWIDTH_4_BYTES;
334 dd->dma_lch_out.dma_conf.src_addr_width =
335 DMA_SLAVE_BUSWIDTH_4_BYTES;
336 }
337
338 if (dd->flags & (AES_FLAGS_CFB8 | AES_FLAGS_CFB16 |
339 AES_FLAGS_CFB32 | AES_FLAGS_CFB64)) {
340 dd->dma_lch_in.dma_conf.src_maxburst = 1;
341 dd->dma_lch_in.dma_conf.dst_maxburst = 1;
342 dd->dma_lch_out.dma_conf.src_maxburst = 1;
343 dd->dma_lch_out.dma_conf.dst_maxburst = 1;
344 } else {
345 dd->dma_lch_in.dma_conf.src_maxburst = dd->caps.max_burst_size;
346 dd->dma_lch_in.dma_conf.dst_maxburst = dd->caps.max_burst_size;
347 dd->dma_lch_out.dma_conf.src_maxburst = dd->caps.max_burst_size;
348 dd->dma_lch_out.dma_conf.dst_maxburst = dd->caps.max_burst_size;
349 }
350
351 dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf);
352 dmaengine_slave_config(dd->dma_lch_out.chan, &dd->dma_lch_out.dma_conf);
353
354 dd->flags |= AES_FLAGS_DMA;
355
356 sg_init_table(&sg[0], 1);
357 sg_dma_address(&sg[0]) = dma_addr_in;
358 sg_dma_len(&sg[0]) = length;
359
360 sg_init_table(&sg[1], 1);
361 sg_dma_address(&sg[1]) = dma_addr_out;
362 sg_dma_len(&sg[1]) = length;
363
364 in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, &sg[0],
365 1, DMA_MEM_TO_DEV,
366 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
367 if (!in_desc)
368 return -EINVAL;
369
370 out_desc = dmaengine_prep_slave_sg(dd->dma_lch_out.chan, &sg[1],
371 1, DMA_DEV_TO_MEM,
372 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
373 if (!out_desc)
374 return -EINVAL;
375
376 out_desc->callback = atmel_aes_dma_callback;
377 out_desc->callback_param = dd;
378
379 dmaengine_submit(out_desc);
380 dma_async_issue_pending(dd->dma_lch_out.chan);
381
382 dmaengine_submit(in_desc);
383 dma_async_issue_pending(dd->dma_lch_in.chan);
384
385 return 0;
386 }
387
388 static int atmel_aes_crypt_cpu_start(struct atmel_aes_dev *dd)
389 {
390 dd->flags &= ~AES_FLAGS_DMA;
391
392 /* use cache buffers */
393 dd->nb_in_sg = atmel_aes_sg_length(dd->req, dd->in_sg);
394 if (!dd->nb_in_sg)
395 return -EINVAL;
396
397 dd->nb_out_sg = atmel_aes_sg_length(dd->req, dd->out_sg);
398 if (!dd->nb_out_sg)
399 return -EINVAL;
400
401 dd->bufcnt = sg_copy_to_buffer(dd->in_sg, dd->nb_in_sg,
402 dd->buf_in, dd->total);
403
404 if (!dd->bufcnt)
405 return -EINVAL;
406
407 dd->total -= dd->bufcnt;
408
409 atmel_aes_write(dd, AES_IER, AES_INT_DATARDY);
410 atmel_aes_write_n(dd, AES_IDATAR(0), (u32 *) dd->buf_in,
411 dd->bufcnt >> 2);
412
413 return 0;
414 }
415
416 static int atmel_aes_crypt_dma_start(struct atmel_aes_dev *dd)
417 {
418 int err, fast = 0, in, out;
419 size_t count;
420 dma_addr_t addr_in, addr_out;
421
422 if ((!dd->in_offset) && (!dd->out_offset)) {
423 /* check for alignment */
424 in = IS_ALIGNED((u32)dd->in_sg->offset, sizeof(u32)) &&
425 IS_ALIGNED(dd->in_sg->length, dd->ctx->block_size);
426 out = IS_ALIGNED((u32)dd->out_sg->offset, sizeof(u32)) &&
427 IS_ALIGNED(dd->out_sg->length, dd->ctx->block_size);
428 fast = in && out;
429
430 if (sg_dma_len(dd->in_sg) != sg_dma_len(dd->out_sg))
431 fast = 0;
432 }
433
434
435 if (fast) {
436 count = min(dd->total, sg_dma_len(dd->in_sg));
437 count = min(count, sg_dma_len(dd->out_sg));
438
439 err = dma_map_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
440 if (!err) {
441 dev_err(dd->dev, "dma_map_sg() error\n");
442 return -EINVAL;
443 }
444
445 err = dma_map_sg(dd->dev, dd->out_sg, 1,
446 DMA_FROM_DEVICE);
447 if (!err) {
448 dev_err(dd->dev, "dma_map_sg() error\n");
449 dma_unmap_sg(dd->dev, dd->in_sg, 1,
450 DMA_TO_DEVICE);
451 return -EINVAL;
452 }
453
454 addr_in = sg_dma_address(dd->in_sg);
455 addr_out = sg_dma_address(dd->out_sg);
456
457 dd->flags |= AES_FLAGS_FAST;
458
459 } else {
460 /* use cache buffers */
461 count = atmel_aes_sg_copy(&dd->in_sg, &dd->in_offset,
462 dd->buf_in, dd->buflen, dd->total, 0);
463
464 addr_in = dd->dma_addr_in;
465 addr_out = dd->dma_addr_out;
466
467 dd->flags &= ~AES_FLAGS_FAST;
468 }
469
470 dd->total -= count;
471
472 err = atmel_aes_crypt_dma(dd, addr_in, addr_out, count);
473
474 if (err && (dd->flags & AES_FLAGS_FAST)) {
475 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
476 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_TO_DEVICE);
477 }
478
479 return err;
480 }
481
482 static int atmel_aes_write_ctrl(struct atmel_aes_dev *dd)
483 {
484 int err;
485 u32 valcr = 0, valmr = 0;
486
487 err = atmel_aes_hw_init(dd);
488
489 if (err)
490 return err;
491
492 /* MR register must be set before IV registers */
493 if (dd->ctx->keylen == AES_KEYSIZE_128)
494 valmr |= AES_MR_KEYSIZE_128;
495 else if (dd->ctx->keylen == AES_KEYSIZE_192)
496 valmr |= AES_MR_KEYSIZE_192;
497 else
498 valmr |= AES_MR_KEYSIZE_256;
499
500 if (dd->flags & AES_FLAGS_CBC) {
501 valmr |= AES_MR_OPMOD_CBC;
502 } else if (dd->flags & AES_FLAGS_CFB) {
503 valmr |= AES_MR_OPMOD_CFB;
504 if (dd->flags & AES_FLAGS_CFB8)
505 valmr |= AES_MR_CFBS_8b;
506 else if (dd->flags & AES_FLAGS_CFB16)
507 valmr |= AES_MR_CFBS_16b;
508 else if (dd->flags & AES_FLAGS_CFB32)
509 valmr |= AES_MR_CFBS_32b;
510 else if (dd->flags & AES_FLAGS_CFB64)
511 valmr |= AES_MR_CFBS_64b;
512 else if (dd->flags & AES_FLAGS_CFB128)
513 valmr |= AES_MR_CFBS_128b;
514 } else if (dd->flags & AES_FLAGS_OFB) {
515 valmr |= AES_MR_OPMOD_OFB;
516 } else if (dd->flags & AES_FLAGS_CTR) {
517 valmr |= AES_MR_OPMOD_CTR;
518 } else {
519 valmr |= AES_MR_OPMOD_ECB;
520 }
521
522 if (dd->flags & AES_FLAGS_ENCRYPT)
523 valmr |= AES_MR_CYPHER_ENC;
524
525 if (dd->total > ATMEL_AES_DMA_THRESHOLD) {
526 valmr |= AES_MR_SMOD_IDATAR0;
527 if (dd->caps.has_dualbuff)
528 valmr |= AES_MR_DUALBUFF;
529 } else {
530 valmr |= AES_MR_SMOD_AUTO;
531 }
532
533 atmel_aes_write(dd, AES_CR, valcr);
534 atmel_aes_write(dd, AES_MR, valmr);
535
536 atmel_aes_write_n(dd, AES_KEYWR(0), dd->ctx->key,
537 dd->ctx->keylen >> 2);
538
539 if (((dd->flags & AES_FLAGS_CBC) || (dd->flags & AES_FLAGS_CFB) ||
540 (dd->flags & AES_FLAGS_OFB) || (dd->flags & AES_FLAGS_CTR)) &&
541 dd->req->info) {
542 atmel_aes_write_n(dd, AES_IVR(0), dd->req->info, 4);
543 }
544
545 return 0;
546 }
547
548 static int atmel_aes_handle_queue(struct atmel_aes_dev *dd,
549 struct ablkcipher_request *req)
550 {
551 struct crypto_async_request *async_req, *backlog;
552 struct atmel_aes_ctx *ctx;
553 struct atmel_aes_reqctx *rctx;
554 unsigned long flags;
555 int err, ret = 0;
556
557 spin_lock_irqsave(&dd->lock, flags);
558 if (req)
559 ret = ablkcipher_enqueue_request(&dd->queue, req);
560 if (dd->flags & AES_FLAGS_BUSY) {
561 spin_unlock_irqrestore(&dd->lock, flags);
562 return ret;
563 }
564 backlog = crypto_get_backlog(&dd->queue);
565 async_req = crypto_dequeue_request(&dd->queue);
566 if (async_req)
567 dd->flags |= AES_FLAGS_BUSY;
568 spin_unlock_irqrestore(&dd->lock, flags);
569
570 if (!async_req)
571 return ret;
572
573 if (backlog)
574 backlog->complete(backlog, -EINPROGRESS);
575
576 req = ablkcipher_request_cast(async_req);
577
578 /* assign new request to device */
579 dd->req = req;
580 dd->total = req->nbytes;
581 dd->in_offset = 0;
582 dd->in_sg = req->src;
583 dd->out_offset = 0;
584 dd->out_sg = req->dst;
585
586 rctx = ablkcipher_request_ctx(req);
587 ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
588 rctx->mode &= AES_FLAGS_MODE_MASK;
589 dd->flags = (dd->flags & ~AES_FLAGS_MODE_MASK) | rctx->mode;
590 dd->ctx = ctx;
591 ctx->dd = dd;
592
593 err = atmel_aes_write_ctrl(dd);
594 if (!err) {
595 if (dd->total > ATMEL_AES_DMA_THRESHOLD)
596 err = atmel_aes_crypt_dma_start(dd);
597 else
598 err = atmel_aes_crypt_cpu_start(dd);
599 }
600 if (err) {
601 /* aes_task will not finish it, so do it here */
602 atmel_aes_finish_req(dd, err);
603 tasklet_schedule(&dd->queue_task);
604 }
605
606 return ret;
607 }
608
609 static int atmel_aes_crypt_dma_stop(struct atmel_aes_dev *dd)
610 {
611 int err = -EINVAL;
612 size_t count;
613
614 if (dd->flags & AES_FLAGS_DMA) {
615 err = 0;
616 if (dd->flags & AES_FLAGS_FAST) {
617 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
618 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
619 } else {
620 dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
621 dd->dma_size, DMA_FROM_DEVICE);
622
623 /* copy data */
624 count = atmel_aes_sg_copy(&dd->out_sg, &dd->out_offset,
625 dd->buf_out, dd->buflen, dd->dma_size, 1);
626 if (count != dd->dma_size) {
627 err = -EINVAL;
628 pr_err("not all data converted: %u\n", count);
629 }
630 }
631 }
632
633 return err;
634 }
635
636
637 static int atmel_aes_buff_init(struct atmel_aes_dev *dd)
638 {
639 int err = -ENOMEM;
640
641 dd->buf_in = (void *)__get_free_pages(GFP_KERNEL, 0);
642 dd->buf_out = (void *)__get_free_pages(GFP_KERNEL, 0);
643 dd->buflen = PAGE_SIZE;
644 dd->buflen &= ~(AES_BLOCK_SIZE - 1);
645
646 if (!dd->buf_in || !dd->buf_out) {
647 dev_err(dd->dev, "unable to alloc pages.\n");
648 goto err_alloc;
649 }
650
651 /* MAP here */
652 dd->dma_addr_in = dma_map_single(dd->dev, dd->buf_in,
653 dd->buflen, DMA_TO_DEVICE);
654 if (dma_mapping_error(dd->dev, dd->dma_addr_in)) {
655 dev_err(dd->dev, "dma %d bytes error\n", dd->buflen);
656 err = -EINVAL;
657 goto err_map_in;
658 }
659
660 dd->dma_addr_out = dma_map_single(dd->dev, dd->buf_out,
661 dd->buflen, DMA_FROM_DEVICE);
662 if (dma_mapping_error(dd->dev, dd->dma_addr_out)) {
663 dev_err(dd->dev, "dma %d bytes error\n", dd->buflen);
664 err = -EINVAL;
665 goto err_map_out;
666 }
667
668 return 0;
669
670 err_map_out:
671 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
672 DMA_TO_DEVICE);
673 err_map_in:
674 free_page((unsigned long)dd->buf_out);
675 free_page((unsigned long)dd->buf_in);
676 err_alloc:
677 if (err)
678 pr_err("error: %d\n", err);
679 return err;
680 }
681
682 static void atmel_aes_buff_cleanup(struct atmel_aes_dev *dd)
683 {
684 dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen,
685 DMA_FROM_DEVICE);
686 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
687 DMA_TO_DEVICE);
688 free_page((unsigned long)dd->buf_out);
689 free_page((unsigned long)dd->buf_in);
690 }
691
692 static int atmel_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
693 {
694 struct atmel_aes_ctx *ctx = crypto_ablkcipher_ctx(
695 crypto_ablkcipher_reqtfm(req));
696 struct atmel_aes_reqctx *rctx = ablkcipher_request_ctx(req);
697 struct atmel_aes_dev *dd;
698
699 if (mode & AES_FLAGS_CFB8) {
700 if (!IS_ALIGNED(req->nbytes, CFB8_BLOCK_SIZE)) {
701 pr_err("request size is not exact amount of CFB8 blocks\n");
702 return -EINVAL;
703 }
704 ctx->block_size = CFB8_BLOCK_SIZE;
705 } else if (mode & AES_FLAGS_CFB16) {
706 if (!IS_ALIGNED(req->nbytes, CFB16_BLOCK_SIZE)) {
707 pr_err("request size is not exact amount of CFB16 blocks\n");
708 return -EINVAL;
709 }
710 ctx->block_size = CFB16_BLOCK_SIZE;
711 } else if (mode & AES_FLAGS_CFB32) {
712 if (!IS_ALIGNED(req->nbytes, CFB32_BLOCK_SIZE)) {
713 pr_err("request size is not exact amount of CFB32 blocks\n");
714 return -EINVAL;
715 }
716 ctx->block_size = CFB32_BLOCK_SIZE;
717 } else {
718 if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE)) {
719 pr_err("request size is not exact amount of AES blocks\n");
720 return -EINVAL;
721 }
722 ctx->block_size = AES_BLOCK_SIZE;
723 }
724
725 dd = atmel_aes_find_dev(ctx);
726 if (!dd)
727 return -ENODEV;
728
729 rctx->mode = mode;
730
731 return atmel_aes_handle_queue(dd, req);
732 }
733
734 static bool atmel_aes_filter(struct dma_chan *chan, void *slave)
735 {
736 struct at_dma_slave *sl = slave;
737
738 if (sl && sl->dma_dev == chan->device->dev) {
739 chan->private = sl;
740 return true;
741 } else {
742 return false;
743 }
744 }
745
746 static int atmel_aes_dma_init(struct atmel_aes_dev *dd,
747 struct crypto_platform_data *pdata)
748 {
749 int err = -ENOMEM;
750 dma_cap_mask_t mask_in, mask_out;
751
752 if (pdata && pdata->dma_slave->txdata.dma_dev &&
753 pdata->dma_slave->rxdata.dma_dev) {
754
755 /* Try to grab 2 DMA channels */
756 dma_cap_zero(mask_in);
757 dma_cap_set(DMA_SLAVE, mask_in);
758
759 dd->dma_lch_in.chan = dma_request_channel(mask_in,
760 atmel_aes_filter, &pdata->dma_slave->rxdata);
761
762 if (!dd->dma_lch_in.chan)
763 goto err_dma_in;
764
765 dd->dma_lch_in.dma_conf.direction = DMA_MEM_TO_DEV;
766 dd->dma_lch_in.dma_conf.dst_addr = dd->phys_base +
767 AES_IDATAR(0);
768 dd->dma_lch_in.dma_conf.src_maxburst = dd->caps.max_burst_size;
769 dd->dma_lch_in.dma_conf.src_addr_width =
770 DMA_SLAVE_BUSWIDTH_4_BYTES;
771 dd->dma_lch_in.dma_conf.dst_maxburst = dd->caps.max_burst_size;
772 dd->dma_lch_in.dma_conf.dst_addr_width =
773 DMA_SLAVE_BUSWIDTH_4_BYTES;
774 dd->dma_lch_in.dma_conf.device_fc = false;
775
776 dma_cap_zero(mask_out);
777 dma_cap_set(DMA_SLAVE, mask_out);
778 dd->dma_lch_out.chan = dma_request_channel(mask_out,
779 atmel_aes_filter, &pdata->dma_slave->txdata);
780
781 if (!dd->dma_lch_out.chan)
782 goto err_dma_out;
783
784 dd->dma_lch_out.dma_conf.direction = DMA_DEV_TO_MEM;
785 dd->dma_lch_out.dma_conf.src_addr = dd->phys_base +
786 AES_ODATAR(0);
787 dd->dma_lch_out.dma_conf.src_maxburst = dd->caps.max_burst_size;
788 dd->dma_lch_out.dma_conf.src_addr_width =
789 DMA_SLAVE_BUSWIDTH_4_BYTES;
790 dd->dma_lch_out.dma_conf.dst_maxburst = dd->caps.max_burst_size;
791 dd->dma_lch_out.dma_conf.dst_addr_width =
792 DMA_SLAVE_BUSWIDTH_4_BYTES;
793 dd->dma_lch_out.dma_conf.device_fc = false;
794
795 return 0;
796 } else {
797 return -ENODEV;
798 }
799
800 err_dma_out:
801 dma_release_channel(dd->dma_lch_in.chan);
802 err_dma_in:
803 return err;
804 }
805
806 static void atmel_aes_dma_cleanup(struct atmel_aes_dev *dd)
807 {
808 dma_release_channel(dd->dma_lch_in.chan);
809 dma_release_channel(dd->dma_lch_out.chan);
810 }
811
812 static int atmel_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
813 unsigned int keylen)
814 {
815 struct atmel_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
816
817 if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
818 keylen != AES_KEYSIZE_256) {
819 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
820 return -EINVAL;
821 }
822
823 memcpy(ctx->key, key, keylen);
824 ctx->keylen = keylen;
825
826 return 0;
827 }
828
829 static int atmel_aes_ecb_encrypt(struct ablkcipher_request *req)
830 {
831 return atmel_aes_crypt(req,
832 AES_FLAGS_ENCRYPT);
833 }
834
835 static int atmel_aes_ecb_decrypt(struct ablkcipher_request *req)
836 {
837 return atmel_aes_crypt(req,
838 0);
839 }
840
841 static int atmel_aes_cbc_encrypt(struct ablkcipher_request *req)
842 {
843 return atmel_aes_crypt(req,
844 AES_FLAGS_ENCRYPT | AES_FLAGS_CBC);
845 }
846
847 static int atmel_aes_cbc_decrypt(struct ablkcipher_request *req)
848 {
849 return atmel_aes_crypt(req,
850 AES_FLAGS_CBC);
851 }
852
853 static int atmel_aes_ofb_encrypt(struct ablkcipher_request *req)
854 {
855 return atmel_aes_crypt(req,
856 AES_FLAGS_ENCRYPT | AES_FLAGS_OFB);
857 }
858
859 static int atmel_aes_ofb_decrypt(struct ablkcipher_request *req)
860 {
861 return atmel_aes_crypt(req,
862 AES_FLAGS_OFB);
863 }
864
865 static int atmel_aes_cfb_encrypt(struct ablkcipher_request *req)
866 {
867 return atmel_aes_crypt(req,
868 AES_FLAGS_ENCRYPT | AES_FLAGS_CFB | AES_FLAGS_CFB128);
869 }
870
871 static int atmel_aes_cfb_decrypt(struct ablkcipher_request *req)
872 {
873 return atmel_aes_crypt(req,
874 AES_FLAGS_CFB | AES_FLAGS_CFB128);
875 }
876
877 static int atmel_aes_cfb64_encrypt(struct ablkcipher_request *req)
878 {
879 return atmel_aes_crypt(req,
880 AES_FLAGS_ENCRYPT | AES_FLAGS_CFB | AES_FLAGS_CFB64);
881 }
882
883 static int atmel_aes_cfb64_decrypt(struct ablkcipher_request *req)
884 {
885 return atmel_aes_crypt(req,
886 AES_FLAGS_CFB | AES_FLAGS_CFB64);
887 }
888
889 static int atmel_aes_cfb32_encrypt(struct ablkcipher_request *req)
890 {
891 return atmel_aes_crypt(req,
892 AES_FLAGS_ENCRYPT | AES_FLAGS_CFB | AES_FLAGS_CFB32);
893 }
894
895 static int atmel_aes_cfb32_decrypt(struct ablkcipher_request *req)
896 {
897 return atmel_aes_crypt(req,
898 AES_FLAGS_CFB | AES_FLAGS_CFB32);
899 }
900
901 static int atmel_aes_cfb16_encrypt(struct ablkcipher_request *req)
902 {
903 return atmel_aes_crypt(req,
904 AES_FLAGS_ENCRYPT | AES_FLAGS_CFB | AES_FLAGS_CFB16);
905 }
906
907 static int atmel_aes_cfb16_decrypt(struct ablkcipher_request *req)
908 {
909 return atmel_aes_crypt(req,
910 AES_FLAGS_CFB | AES_FLAGS_CFB16);
911 }
912
913 static int atmel_aes_cfb8_encrypt(struct ablkcipher_request *req)
914 {
915 return atmel_aes_crypt(req,
916 AES_FLAGS_ENCRYPT | AES_FLAGS_CFB | AES_FLAGS_CFB8);
917 }
918
919 static int atmel_aes_cfb8_decrypt(struct ablkcipher_request *req)
920 {
921 return atmel_aes_crypt(req,
922 AES_FLAGS_CFB | AES_FLAGS_CFB8);
923 }
924
925 static int atmel_aes_ctr_encrypt(struct ablkcipher_request *req)
926 {
927 return atmel_aes_crypt(req,
928 AES_FLAGS_ENCRYPT | AES_FLAGS_CTR);
929 }
930
931 static int atmel_aes_ctr_decrypt(struct ablkcipher_request *req)
932 {
933 return atmel_aes_crypt(req,
934 AES_FLAGS_CTR);
935 }
936
937 static int atmel_aes_cra_init(struct crypto_tfm *tfm)
938 {
939 tfm->crt_ablkcipher.reqsize = sizeof(struct atmel_aes_reqctx);
940
941 return 0;
942 }
943
944 static void atmel_aes_cra_exit(struct crypto_tfm *tfm)
945 {
946 }
947
948 static struct crypto_alg aes_algs[] = {
949 {
950 .cra_name = "ecb(aes)",
951 .cra_driver_name = "atmel-ecb-aes",
952 .cra_priority = 100,
953 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
954 .cra_blocksize = AES_BLOCK_SIZE,
955 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
956 .cra_alignmask = 0xf,
957 .cra_type = &crypto_ablkcipher_type,
958 .cra_module = THIS_MODULE,
959 .cra_init = atmel_aes_cra_init,
960 .cra_exit = atmel_aes_cra_exit,
961 .cra_u.ablkcipher = {
962 .min_keysize = AES_MIN_KEY_SIZE,
963 .max_keysize = AES_MAX_KEY_SIZE,
964 .setkey = atmel_aes_setkey,
965 .encrypt = atmel_aes_ecb_encrypt,
966 .decrypt = atmel_aes_ecb_decrypt,
967 }
968 },
969 {
970 .cra_name = "cbc(aes)",
971 .cra_driver_name = "atmel-cbc-aes",
972 .cra_priority = 100,
973 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
974 .cra_blocksize = AES_BLOCK_SIZE,
975 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
976 .cra_alignmask = 0xf,
977 .cra_type = &crypto_ablkcipher_type,
978 .cra_module = THIS_MODULE,
979 .cra_init = atmel_aes_cra_init,
980 .cra_exit = atmel_aes_cra_exit,
981 .cra_u.ablkcipher = {
982 .min_keysize = AES_MIN_KEY_SIZE,
983 .max_keysize = AES_MAX_KEY_SIZE,
984 .ivsize = AES_BLOCK_SIZE,
985 .setkey = atmel_aes_setkey,
986 .encrypt = atmel_aes_cbc_encrypt,
987 .decrypt = atmel_aes_cbc_decrypt,
988 }
989 },
990 {
991 .cra_name = "ofb(aes)",
992 .cra_driver_name = "atmel-ofb-aes",
993 .cra_priority = 100,
994 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
995 .cra_blocksize = AES_BLOCK_SIZE,
996 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
997 .cra_alignmask = 0xf,
998 .cra_type = &crypto_ablkcipher_type,
999 .cra_module = THIS_MODULE,
1000 .cra_init = atmel_aes_cra_init,
1001 .cra_exit = atmel_aes_cra_exit,
1002 .cra_u.ablkcipher = {
1003 .min_keysize = AES_MIN_KEY_SIZE,
1004 .max_keysize = AES_MAX_KEY_SIZE,
1005 .ivsize = AES_BLOCK_SIZE,
1006 .setkey = atmel_aes_setkey,
1007 .encrypt = atmel_aes_ofb_encrypt,
1008 .decrypt = atmel_aes_ofb_decrypt,
1009 }
1010 },
1011 {
1012 .cra_name = "cfb(aes)",
1013 .cra_driver_name = "atmel-cfb-aes",
1014 .cra_priority = 100,
1015 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1016 .cra_blocksize = AES_BLOCK_SIZE,
1017 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1018 .cra_alignmask = 0xf,
1019 .cra_type = &crypto_ablkcipher_type,
1020 .cra_module = THIS_MODULE,
1021 .cra_init = atmel_aes_cra_init,
1022 .cra_exit = atmel_aes_cra_exit,
1023 .cra_u.ablkcipher = {
1024 .min_keysize = AES_MIN_KEY_SIZE,
1025 .max_keysize = AES_MAX_KEY_SIZE,
1026 .ivsize = AES_BLOCK_SIZE,
1027 .setkey = atmel_aes_setkey,
1028 .encrypt = atmel_aes_cfb_encrypt,
1029 .decrypt = atmel_aes_cfb_decrypt,
1030 }
1031 },
1032 {
1033 .cra_name = "cfb32(aes)",
1034 .cra_driver_name = "atmel-cfb32-aes",
1035 .cra_priority = 100,
1036 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1037 .cra_blocksize = CFB32_BLOCK_SIZE,
1038 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1039 .cra_alignmask = 0x3,
1040 .cra_type = &crypto_ablkcipher_type,
1041 .cra_module = THIS_MODULE,
1042 .cra_init = atmel_aes_cra_init,
1043 .cra_exit = atmel_aes_cra_exit,
1044 .cra_u.ablkcipher = {
1045 .min_keysize = AES_MIN_KEY_SIZE,
1046 .max_keysize = AES_MAX_KEY_SIZE,
1047 .ivsize = AES_BLOCK_SIZE,
1048 .setkey = atmel_aes_setkey,
1049 .encrypt = atmel_aes_cfb32_encrypt,
1050 .decrypt = atmel_aes_cfb32_decrypt,
1051 }
1052 },
1053 {
1054 .cra_name = "cfb16(aes)",
1055 .cra_driver_name = "atmel-cfb16-aes",
1056 .cra_priority = 100,
1057 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1058 .cra_blocksize = CFB16_BLOCK_SIZE,
1059 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1060 .cra_alignmask = 0x1,
1061 .cra_type = &crypto_ablkcipher_type,
1062 .cra_module = THIS_MODULE,
1063 .cra_init = atmel_aes_cra_init,
1064 .cra_exit = atmel_aes_cra_exit,
1065 .cra_u.ablkcipher = {
1066 .min_keysize = AES_MIN_KEY_SIZE,
1067 .max_keysize = AES_MAX_KEY_SIZE,
1068 .ivsize = AES_BLOCK_SIZE,
1069 .setkey = atmel_aes_setkey,
1070 .encrypt = atmel_aes_cfb16_encrypt,
1071 .decrypt = atmel_aes_cfb16_decrypt,
1072 }
1073 },
1074 {
1075 .cra_name = "cfb8(aes)",
1076 .cra_driver_name = "atmel-cfb8-aes",
1077 .cra_priority = 100,
1078 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1079 .cra_blocksize = CFB64_BLOCK_SIZE,
1080 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1081 .cra_alignmask = 0x0,
1082 .cra_type = &crypto_ablkcipher_type,
1083 .cra_module = THIS_MODULE,
1084 .cra_init = atmel_aes_cra_init,
1085 .cra_exit = atmel_aes_cra_exit,
1086 .cra_u.ablkcipher = {
1087 .min_keysize = AES_MIN_KEY_SIZE,
1088 .max_keysize = AES_MAX_KEY_SIZE,
1089 .ivsize = AES_BLOCK_SIZE,
1090 .setkey = atmel_aes_setkey,
1091 .encrypt = atmel_aes_cfb8_encrypt,
1092 .decrypt = atmel_aes_cfb8_decrypt,
1093 }
1094 },
1095 {
1096 .cra_name = "ctr(aes)",
1097 .cra_driver_name = "atmel-ctr-aes",
1098 .cra_priority = 100,
1099 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1100 .cra_blocksize = AES_BLOCK_SIZE,
1101 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1102 .cra_alignmask = 0xf,
1103 .cra_type = &crypto_ablkcipher_type,
1104 .cra_module = THIS_MODULE,
1105 .cra_init = atmel_aes_cra_init,
1106 .cra_exit = atmel_aes_cra_exit,
1107 .cra_u.ablkcipher = {
1108 .min_keysize = AES_MIN_KEY_SIZE,
1109 .max_keysize = AES_MAX_KEY_SIZE,
1110 .ivsize = AES_BLOCK_SIZE,
1111 .setkey = atmel_aes_setkey,
1112 .encrypt = atmel_aes_ctr_encrypt,
1113 .decrypt = atmel_aes_ctr_decrypt,
1114 }
1115 },
1116 };
1117
1118 static struct crypto_alg aes_cfb64_alg = {
1119 .cra_name = "cfb64(aes)",
1120 .cra_driver_name = "atmel-cfb64-aes",
1121 .cra_priority = 100,
1122 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1123 .cra_blocksize = CFB64_BLOCK_SIZE,
1124 .cra_ctxsize = sizeof(struct atmel_aes_ctx),
1125 .cra_alignmask = 0x7,
1126 .cra_type = &crypto_ablkcipher_type,
1127 .cra_module = THIS_MODULE,
1128 .cra_init = atmel_aes_cra_init,
1129 .cra_exit = atmel_aes_cra_exit,
1130 .cra_u.ablkcipher = {
1131 .min_keysize = AES_MIN_KEY_SIZE,
1132 .max_keysize = AES_MAX_KEY_SIZE,
1133 .ivsize = AES_BLOCK_SIZE,
1134 .setkey = atmel_aes_setkey,
1135 .encrypt = atmel_aes_cfb64_encrypt,
1136 .decrypt = atmel_aes_cfb64_decrypt,
1137 }
1138 };
1139
1140 static void atmel_aes_queue_task(unsigned long data)
1141 {
1142 struct atmel_aes_dev *dd = (struct atmel_aes_dev *)data;
1143
1144 atmel_aes_handle_queue(dd, NULL);
1145 }
1146
1147 static void atmel_aes_done_task(unsigned long data)
1148 {
1149 struct atmel_aes_dev *dd = (struct atmel_aes_dev *) data;
1150 int err;
1151
1152 if (!(dd->flags & AES_FLAGS_DMA)) {
1153 atmel_aes_read_n(dd, AES_ODATAR(0), (u32 *) dd->buf_out,
1154 dd->bufcnt >> 2);
1155
1156 if (sg_copy_from_buffer(dd->out_sg, dd->nb_out_sg,
1157 dd->buf_out, dd->bufcnt))
1158 err = 0;
1159 else
1160 err = -EINVAL;
1161
1162 goto cpu_end;
1163 }
1164
1165 err = atmel_aes_crypt_dma_stop(dd);
1166
1167 err = dd->err ? : err;
1168
1169 if (dd->total && !err) {
1170 if (dd->flags & AES_FLAGS_FAST) {
1171 dd->in_sg = sg_next(dd->in_sg);
1172 dd->out_sg = sg_next(dd->out_sg);
1173 if (!dd->in_sg || !dd->out_sg)
1174 err = -EINVAL;
1175 }
1176 if (!err)
1177 err = atmel_aes_crypt_dma_start(dd);
1178 if (!err)
1179 return; /* DMA started. Not fininishing. */
1180 }
1181
1182 cpu_end:
1183 atmel_aes_finish_req(dd, err);
1184 atmel_aes_handle_queue(dd, NULL);
1185 }
1186
1187 static irqreturn_t atmel_aes_irq(int irq, void *dev_id)
1188 {
1189 struct atmel_aes_dev *aes_dd = dev_id;
1190 u32 reg;
1191
1192 reg = atmel_aes_read(aes_dd, AES_ISR);
1193 if (reg & atmel_aes_read(aes_dd, AES_IMR)) {
1194 atmel_aes_write(aes_dd, AES_IDR, reg);
1195 if (AES_FLAGS_BUSY & aes_dd->flags)
1196 tasklet_schedule(&aes_dd->done_task);
1197 else
1198 dev_warn(aes_dd->dev, "AES interrupt when no active requests.\n");
1199 return IRQ_HANDLED;
1200 }
1201
1202 return IRQ_NONE;
1203 }
1204
1205 static void atmel_aes_unregister_algs(struct atmel_aes_dev *dd)
1206 {
1207 int i;
1208
1209 for (i = 0; i < ARRAY_SIZE(aes_algs); i++)
1210 crypto_unregister_alg(&aes_algs[i]);
1211 if (dd->caps.has_cfb64)
1212 crypto_unregister_alg(&aes_cfb64_alg);
1213 }
1214
1215 static int atmel_aes_register_algs(struct atmel_aes_dev *dd)
1216 {
1217 int err, i, j;
1218
1219 for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
1220 err = crypto_register_alg(&aes_algs[i]);
1221 if (err)
1222 goto err_aes_algs;
1223 }
1224
1225 if (dd->caps.has_cfb64) {
1226 err = crypto_register_alg(&aes_cfb64_alg);
1227 if (err)
1228 goto err_aes_cfb64_alg;
1229 }
1230
1231 return 0;
1232
1233 err_aes_cfb64_alg:
1234 i = ARRAY_SIZE(aes_algs);
1235 err_aes_algs:
1236 for (j = 0; j < i; j++)
1237 crypto_unregister_alg(&aes_algs[j]);
1238
1239 return err;
1240 }
1241
1242 static void atmel_aes_get_cap(struct atmel_aes_dev *dd)
1243 {
1244 dd->caps.has_dualbuff = 0;
1245 dd->caps.has_cfb64 = 0;
1246 dd->caps.max_burst_size = 1;
1247
1248 /* keep only major version number */
1249 switch (dd->hw_version & 0xff0) {
1250 case 0x130:
1251 dd->caps.has_dualbuff = 1;
1252 dd->caps.has_cfb64 = 1;
1253 dd->caps.max_burst_size = 4;
1254 break;
1255 case 0x120:
1256 break;
1257 default:
1258 dev_warn(dd->dev,
1259 "Unmanaged aes version, set minimum capabilities\n");
1260 break;
1261 }
1262 }
1263
1264 static int atmel_aes_probe(struct platform_device *pdev)
1265 {
1266 struct atmel_aes_dev *aes_dd;
1267 struct crypto_platform_data *pdata;
1268 struct device *dev = &pdev->dev;
1269 struct resource *aes_res;
1270 unsigned long aes_phys_size;
1271 int err;
1272
1273 pdata = pdev->dev.platform_data;
1274 if (!pdata) {
1275 err = -ENXIO;
1276 goto aes_dd_err;
1277 }
1278
1279 aes_dd = kzalloc(sizeof(struct atmel_aes_dev), GFP_KERNEL);
1280 if (aes_dd == NULL) {
1281 dev_err(dev, "unable to alloc data struct.\n");
1282 err = -ENOMEM;
1283 goto aes_dd_err;
1284 }
1285
1286 aes_dd->dev = dev;
1287
1288 platform_set_drvdata(pdev, aes_dd);
1289
1290 INIT_LIST_HEAD(&aes_dd->list);
1291
1292 tasklet_init(&aes_dd->done_task, atmel_aes_done_task,
1293 (unsigned long)aes_dd);
1294 tasklet_init(&aes_dd->queue_task, atmel_aes_queue_task,
1295 (unsigned long)aes_dd);
1296
1297 crypto_init_queue(&aes_dd->queue, ATMEL_AES_QUEUE_LENGTH);
1298
1299 aes_dd->irq = -1;
1300
1301 /* Get the base address */
1302 aes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1303 if (!aes_res) {
1304 dev_err(dev, "no MEM resource info\n");
1305 err = -ENODEV;
1306 goto res_err;
1307 }
1308 aes_dd->phys_base = aes_res->start;
1309 aes_phys_size = resource_size(aes_res);
1310
1311 /* Get the IRQ */
1312 aes_dd->irq = platform_get_irq(pdev, 0);
1313 if (aes_dd->irq < 0) {
1314 dev_err(dev, "no IRQ resource info\n");
1315 err = aes_dd->irq;
1316 goto aes_irq_err;
1317 }
1318
1319 err = request_irq(aes_dd->irq, atmel_aes_irq, IRQF_SHARED, "atmel-aes",
1320 aes_dd);
1321 if (err) {
1322 dev_err(dev, "unable to request aes irq.\n");
1323 goto aes_irq_err;
1324 }
1325
1326 /* Initializing the clock */
1327 aes_dd->iclk = clk_get(&pdev->dev, "aes_clk");
1328 if (IS_ERR(aes_dd->iclk)) {
1329 dev_err(dev, "clock intialization failed.\n");
1330 err = PTR_ERR(aes_dd->iclk);
1331 goto clk_err;
1332 }
1333
1334 aes_dd->io_base = ioremap(aes_dd->phys_base, aes_phys_size);
1335 if (!aes_dd->io_base) {
1336 dev_err(dev, "can't ioremap\n");
1337 err = -ENOMEM;
1338 goto aes_io_err;
1339 }
1340
1341 atmel_aes_hw_version_init(aes_dd);
1342
1343 atmel_aes_get_cap(aes_dd);
1344
1345 err = atmel_aes_buff_init(aes_dd);
1346 if (err)
1347 goto err_aes_buff;
1348
1349 err = atmel_aes_dma_init(aes_dd, pdata);
1350 if (err)
1351 goto err_aes_dma;
1352
1353 spin_lock(&atmel_aes.lock);
1354 list_add_tail(&aes_dd->list, &atmel_aes.dev_list);
1355 spin_unlock(&atmel_aes.lock);
1356
1357 err = atmel_aes_register_algs(aes_dd);
1358 if (err)
1359 goto err_algs;
1360
1361 dev_info(dev, "Atmel AES\n");
1362
1363 return 0;
1364
1365 err_algs:
1366 spin_lock(&atmel_aes.lock);
1367 list_del(&aes_dd->list);
1368 spin_unlock(&atmel_aes.lock);
1369 atmel_aes_dma_cleanup(aes_dd);
1370 err_aes_dma:
1371 atmel_aes_buff_cleanup(aes_dd);
1372 err_aes_buff:
1373 iounmap(aes_dd->io_base);
1374 aes_io_err:
1375 clk_put(aes_dd->iclk);
1376 clk_err:
1377 free_irq(aes_dd->irq, aes_dd);
1378 aes_irq_err:
1379 res_err:
1380 tasklet_kill(&aes_dd->done_task);
1381 tasklet_kill(&aes_dd->queue_task);
1382 kfree(aes_dd);
1383 aes_dd = NULL;
1384 aes_dd_err:
1385 dev_err(dev, "initialization failed.\n");
1386
1387 return err;
1388 }
1389
1390 static int atmel_aes_remove(struct platform_device *pdev)
1391 {
1392 static struct atmel_aes_dev *aes_dd;
1393
1394 aes_dd = platform_get_drvdata(pdev);
1395 if (!aes_dd)
1396 return -ENODEV;
1397 spin_lock(&atmel_aes.lock);
1398 list_del(&aes_dd->list);
1399 spin_unlock(&atmel_aes.lock);
1400
1401 atmel_aes_unregister_algs(aes_dd);
1402
1403 tasklet_kill(&aes_dd->done_task);
1404 tasklet_kill(&aes_dd->queue_task);
1405
1406 atmel_aes_dma_cleanup(aes_dd);
1407
1408 iounmap(aes_dd->io_base);
1409
1410 clk_put(aes_dd->iclk);
1411
1412 if (aes_dd->irq > 0)
1413 free_irq(aes_dd->irq, aes_dd);
1414
1415 kfree(aes_dd);
1416 aes_dd = NULL;
1417
1418 return 0;
1419 }
1420
1421 static struct platform_driver atmel_aes_driver = {
1422 .probe = atmel_aes_probe,
1423 .remove = atmel_aes_remove,
1424 .driver = {
1425 .name = "atmel_aes",
1426 .owner = THIS_MODULE,
1427 },
1428 };
1429
1430 module_platform_driver(atmel_aes_driver);
1431
1432 MODULE_DESCRIPTION("Atmel AES hw acceleration support.");
1433 MODULE_LICENSE("GPL v2");
1434 MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
Linus' kernel tree