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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[linux-2.6/libata-dev.git] / drivers / crypto / atmel-tdes.c
blob7c73fbb17538adaaf7550b96889c66d9b8f0b04e
1 /*
2 * Cryptographic API.
3 *
4 * Support for ATMEL DES/TDES 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 drivers.
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/des.h>
39 #include <crypto/hash.h>
40 #include <crypto/internal/hash.h>
41 #include "atmel-tdes-regs.h"
42
43 /* TDES flags */
44 #define TDES_FLAGS_MODE_MASK 0x007f
45 #define TDES_FLAGS_ENCRYPT BIT(0)
46 #define TDES_FLAGS_CBC BIT(1)
47 #define TDES_FLAGS_CFB BIT(2)
48 #define TDES_FLAGS_CFB8 BIT(3)
49 #define TDES_FLAGS_CFB16 BIT(4)
50 #define TDES_FLAGS_CFB32 BIT(5)
51 #define TDES_FLAGS_OFB BIT(6)
52
53 #define TDES_FLAGS_INIT BIT(16)
54 #define TDES_FLAGS_FAST BIT(17)
55 #define TDES_FLAGS_BUSY BIT(18)
56
57 #define ATMEL_TDES_QUEUE_LENGTH 1
58
59 #define CFB8_BLOCK_SIZE 1
60 #define CFB16_BLOCK_SIZE 2
61 #define CFB32_BLOCK_SIZE 4
62 #define CFB64_BLOCK_SIZE 8
63
64
65 struct atmel_tdes_dev;
66
67 struct atmel_tdes_ctx {
68 struct atmel_tdes_dev *dd;
69
70 int keylen;
71 u32 key[3*DES_KEY_SIZE / sizeof(u32)];
72 unsigned long flags;
73 };
74
75 struct atmel_tdes_reqctx {
76 unsigned long mode;
77 };
78
79 struct atmel_tdes_dev {
80 struct list_head list;
81 unsigned long phys_base;
82 void __iomem *io_base;
83
84 struct atmel_tdes_ctx *ctx;
85 struct device *dev;
86 struct clk *iclk;
87 int irq;
88
89 unsigned long flags;
90 int err;
91
92 spinlock_t lock;
93 struct crypto_queue queue;
94
95 struct tasklet_struct done_task;
96 struct tasklet_struct queue_task;
97
98 struct ablkcipher_request *req;
99 size_t total;
100
101 struct scatterlist *in_sg;
102 size_t in_offset;
103 struct scatterlist *out_sg;
104 size_t out_offset;
105
106 size_t buflen;
107 size_t dma_size;
108
109 void *buf_in;
110 int dma_in;
111 dma_addr_t dma_addr_in;
112
113 void *buf_out;
114 int dma_out;
115 dma_addr_t dma_addr_out;
116 };
117
118 struct atmel_tdes_drv {
119 struct list_head dev_list;
120 spinlock_t lock;
121 };
122
123 static struct atmel_tdes_drv atmel_tdes = {
124 .dev_list = LIST_HEAD_INIT(atmel_tdes.dev_list),
125 .lock = __SPIN_LOCK_UNLOCKED(atmel_tdes.lock),
126 };
127
128 static int atmel_tdes_sg_copy(struct scatterlist **sg, size_t *offset,
129 void *buf, size_t buflen, size_t total, int out)
130 {
131 unsigned int count, off = 0;
132
133 while (buflen && total) {
134 count = min((*sg)->length - *offset, total);
135 count = min(count, buflen);
136
137 if (!count)
138 return off;
139
140 scatterwalk_map_and_copy(buf + off, *sg, *offset, count, out);
141
142 off += count;
143 buflen -= count;
144 *offset += count;
145 total -= count;
146
147 if (*offset == (*sg)->length) {
148 *sg = sg_next(*sg);
149 if (*sg)
150 *offset = 0;
151 else
152 total = 0;
153 }
154 }
155
156 return off;
157 }
158
159 static inline u32 atmel_tdes_read(struct atmel_tdes_dev *dd, u32 offset)
160 {
161 return readl_relaxed(dd->io_base + offset);
162 }
163
164 static inline void atmel_tdes_write(struct atmel_tdes_dev *dd,
165 u32 offset, u32 value)
166 {
167 writel_relaxed(value, dd->io_base + offset);
168 }
169
170 static void atmel_tdes_write_n(struct atmel_tdes_dev *dd, u32 offset,
171 u32 *value, int count)
172 {
173 for (; count--; value++, offset += 4)
174 atmel_tdes_write(dd, offset, *value);
175 }
176
177 static struct atmel_tdes_dev *atmel_tdes_find_dev(struct atmel_tdes_ctx *ctx)
178 {
179 struct atmel_tdes_dev *tdes_dd = NULL;
180 struct atmel_tdes_dev *tmp;
181
182 spin_lock_bh(&atmel_tdes.lock);
183 if (!ctx->dd) {
184 list_for_each_entry(tmp, &atmel_tdes.dev_list, list) {
185 tdes_dd = tmp;
186 break;
187 }
188 ctx->dd = tdes_dd;
189 } else {
190 tdes_dd = ctx->dd;
191 }
192 spin_unlock_bh(&atmel_tdes.lock);
193
194 return tdes_dd;
195 }
196
197 static int atmel_tdes_hw_init(struct atmel_tdes_dev *dd)
198 {
199 clk_prepare_enable(dd->iclk);
200
201 if (!(dd->flags & TDES_FLAGS_INIT)) {
202 atmel_tdes_write(dd, TDES_CR, TDES_CR_SWRST);
203 dd->flags |= TDES_FLAGS_INIT;
204 dd->err = 0;
205 }
206
207 return 0;
208 }
209
210 static int atmel_tdes_write_ctrl(struct atmel_tdes_dev *dd)
211 {
212 int err;
213 u32 valcr = 0, valmr = TDES_MR_SMOD_PDC;
214
215 err = atmel_tdes_hw_init(dd);
216
217 if (err)
218 return err;
219
220 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
221
222 /* MR register must be set before IV registers */
223 if (dd->ctx->keylen > (DES_KEY_SIZE << 1)) {
224 valmr |= TDES_MR_KEYMOD_3KEY;
225 valmr |= TDES_MR_TDESMOD_TDES;
226 } else if (dd->ctx->keylen > DES_KEY_SIZE) {
227 valmr |= TDES_MR_KEYMOD_2KEY;
228 valmr |= TDES_MR_TDESMOD_TDES;
229 } else {
230 valmr |= TDES_MR_TDESMOD_DES;
231 }
232
233 if (dd->flags & TDES_FLAGS_CBC) {
234 valmr |= TDES_MR_OPMOD_CBC;
235 } else if (dd->flags & TDES_FLAGS_CFB) {
236 valmr |= TDES_MR_OPMOD_CFB;
237
238 if (dd->flags & TDES_FLAGS_CFB8)
239 valmr |= TDES_MR_CFBS_8b;
240 else if (dd->flags & TDES_FLAGS_CFB16)
241 valmr |= TDES_MR_CFBS_16b;
242 else if (dd->flags & TDES_FLAGS_CFB32)
243 valmr |= TDES_MR_CFBS_32b;
244 } else if (dd->flags & TDES_FLAGS_OFB) {
245 valmr |= TDES_MR_OPMOD_OFB;
246 }
247
248 if ((dd->flags & TDES_FLAGS_ENCRYPT) || (dd->flags & TDES_FLAGS_OFB))
249 valmr |= TDES_MR_CYPHER_ENC;
250
251 atmel_tdes_write(dd, TDES_CR, valcr);
252 atmel_tdes_write(dd, TDES_MR, valmr);
253
254 atmel_tdes_write_n(dd, TDES_KEY1W1R, dd->ctx->key,
255 dd->ctx->keylen >> 2);
256
257 if (((dd->flags & TDES_FLAGS_CBC) || (dd->flags & TDES_FLAGS_CFB) ||
258 (dd->flags & TDES_FLAGS_OFB)) && dd->req->info) {
259 atmel_tdes_write_n(dd, TDES_IV1R, dd->req->info, 2);
260 }
261
262 return 0;
263 }
264
265 static int atmel_tdes_crypt_dma_stop(struct atmel_tdes_dev *dd)
266 {
267 int err = 0;
268 size_t count;
269
270 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
271
272 if (dd->flags & TDES_FLAGS_FAST) {
273 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
274 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
275 } else {
276 dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
277 dd->dma_size, DMA_FROM_DEVICE);
278
279 /* copy data */
280 count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset,
281 dd->buf_out, dd->buflen, dd->dma_size, 1);
282 if (count != dd->dma_size) {
283 err = -EINVAL;
284 pr_err("not all data converted: %u\n", count);
285 }
286 }
287
288 return err;
289 }
290
291 static int atmel_tdes_dma_init(struct atmel_tdes_dev *dd)
292 {
293 int err = -ENOMEM;
294
295 dd->buf_in = (void *)__get_free_pages(GFP_KERNEL, 0);
296 dd->buf_out = (void *)__get_free_pages(GFP_KERNEL, 0);
297 dd->buflen = PAGE_SIZE;
298 dd->buflen &= ~(DES_BLOCK_SIZE - 1);
299
300 if (!dd->buf_in || !dd->buf_out) {
301 dev_err(dd->dev, "unable to alloc pages.\n");
302 goto err_alloc;
303 }
304
305 /* MAP here */
306 dd->dma_addr_in = dma_map_single(dd->dev, dd->buf_in,
307 dd->buflen, DMA_TO_DEVICE);
308 if (dma_mapping_error(dd->dev, dd->dma_addr_in)) {
309 dev_err(dd->dev, "dma %d bytes error\n", dd->buflen);
310 err = -EINVAL;
311 goto err_map_in;
312 }
313
314 dd->dma_addr_out = dma_map_single(dd->dev, dd->buf_out,
315 dd->buflen, DMA_FROM_DEVICE);
316 if (dma_mapping_error(dd->dev, dd->dma_addr_out)) {
317 dev_err(dd->dev, "dma %d bytes error\n", dd->buflen);
318 err = -EINVAL;
319 goto err_map_out;
320 }
321
322 return 0;
323
324 err_map_out:
325 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
326 DMA_TO_DEVICE);
327 err_map_in:
328 free_page((unsigned long)dd->buf_out);
329 free_page((unsigned long)dd->buf_in);
330 err_alloc:
331 if (err)
332 pr_err("error: %d\n", err);
333 return err;
334 }
335
336 static void atmel_tdes_dma_cleanup(struct atmel_tdes_dev *dd)
337 {
338 dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen,
339 DMA_FROM_DEVICE);
340 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
341 DMA_TO_DEVICE);
342 free_page((unsigned long)dd->buf_out);
343 free_page((unsigned long)dd->buf_in);
344 }
345
346 static int atmel_tdes_crypt_dma(struct crypto_tfm *tfm, dma_addr_t dma_addr_in,
347 dma_addr_t dma_addr_out, int length)
348 {
349 struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm);
350 struct atmel_tdes_dev *dd = ctx->dd;
351 int len32;
352
353 dd->dma_size = length;
354
355 if (!(dd->flags & TDES_FLAGS_FAST)) {
356 dma_sync_single_for_device(dd->dev, dma_addr_in, length,
357 DMA_TO_DEVICE);
358 }
359
360 if ((dd->flags & TDES_FLAGS_CFB) && (dd->flags & TDES_FLAGS_CFB8))
361 len32 = DIV_ROUND_UP(length, sizeof(u8));
362 else if ((dd->flags & TDES_FLAGS_CFB) && (dd->flags & TDES_FLAGS_CFB16))
363 len32 = DIV_ROUND_UP(length, sizeof(u16));
364 else
365 len32 = DIV_ROUND_UP(length, sizeof(u32));
366
367 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
368 atmel_tdes_write(dd, TDES_TPR, dma_addr_in);
369 atmel_tdes_write(dd, TDES_TCR, len32);
370 atmel_tdes_write(dd, TDES_RPR, dma_addr_out);
371 atmel_tdes_write(dd, TDES_RCR, len32);
372
373 /* Enable Interrupt */
374 atmel_tdes_write(dd, TDES_IER, TDES_INT_ENDRX);
375
376 /* Start DMA transfer */
377 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTEN | TDES_PTCR_RXTEN);
378
379 return 0;
380 }
381
382 static int atmel_tdes_crypt_dma_start(struct atmel_tdes_dev *dd)
383 {
384 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(
385 crypto_ablkcipher_reqtfm(dd->req));
386 int err, fast = 0, in, out;
387 size_t count;
388 dma_addr_t addr_in, addr_out;
389
390 if (sg_is_last(dd->in_sg) && sg_is_last(dd->out_sg)) {
391 /* check for alignment */
392 in = IS_ALIGNED((u32)dd->in_sg->offset, sizeof(u32));
393 out = IS_ALIGNED((u32)dd->out_sg->offset, sizeof(u32));
394
395 fast = in && out;
396 }
397
398 if (fast) {
399 count = min(dd->total, sg_dma_len(dd->in_sg));
400 count = min(count, sg_dma_len(dd->out_sg));
401
402 if (count != dd->total) {
403 pr_err("request length != buffer length\n");
404 return -EINVAL;
405 }
406
407 err = dma_map_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
408 if (!err) {
409 dev_err(dd->dev, "dma_map_sg() error\n");
410 return -EINVAL;
411 }
412
413 err = dma_map_sg(dd->dev, dd->out_sg, 1,
414 DMA_FROM_DEVICE);
415 if (!err) {
416 dev_err(dd->dev, "dma_map_sg() error\n");
417 dma_unmap_sg(dd->dev, dd->in_sg, 1,
418 DMA_TO_DEVICE);
419 return -EINVAL;
420 }
421
422 addr_in = sg_dma_address(dd->in_sg);
423 addr_out = sg_dma_address(dd->out_sg);
424
425 dd->flags |= TDES_FLAGS_FAST;
426
427 } else {
428 /* use cache buffers */
429 count = atmel_tdes_sg_copy(&dd->in_sg, &dd->in_offset,
430 dd->buf_in, dd->buflen, dd->total, 0);
431
432 addr_in = dd->dma_addr_in;
433 addr_out = dd->dma_addr_out;
434
435 dd->flags &= ~TDES_FLAGS_FAST;
436
437 }
438
439 dd->total -= count;
440
441 err = atmel_tdes_crypt_dma(tfm, addr_in, addr_out, count);
442 if (err) {
443 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
444 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_TO_DEVICE);
445 }
446
447 return err;
448 }
449
450
451 static void atmel_tdes_finish_req(struct atmel_tdes_dev *dd, int err)
452 {
453 struct ablkcipher_request *req = dd->req;
454
455 clk_disable_unprepare(dd->iclk);
456
457 dd->flags &= ~TDES_FLAGS_BUSY;
458
459 req->base.complete(&req->base, err);
460 }
461
462 static int atmel_tdes_handle_queue(struct atmel_tdes_dev *dd,
463 struct ablkcipher_request *req)
464 {
465 struct crypto_async_request *async_req, *backlog;
466 struct atmel_tdes_ctx *ctx;
467 struct atmel_tdes_reqctx *rctx;
468 unsigned long flags;
469 int err, ret = 0;
470
471 spin_lock_irqsave(&dd->lock, flags);
472 if (req)
473 ret = ablkcipher_enqueue_request(&dd->queue, req);
474 if (dd->flags & TDES_FLAGS_BUSY) {
475 spin_unlock_irqrestore(&dd->lock, flags);
476 return ret;
477 }
478 backlog = crypto_get_backlog(&dd->queue);
479 async_req = crypto_dequeue_request(&dd->queue);
480 if (async_req)
481 dd->flags |= TDES_FLAGS_BUSY;
482 spin_unlock_irqrestore(&dd->lock, flags);
483
484 if (!async_req)
485 return ret;
486
487 if (backlog)
488 backlog->complete(backlog, -EINPROGRESS);
489
490 req = ablkcipher_request_cast(async_req);
491
492 /* assign new request to device */
493 dd->req = req;
494 dd->total = req->nbytes;
495 dd->in_offset = 0;
496 dd->in_sg = req->src;
497 dd->out_offset = 0;
498 dd->out_sg = req->dst;
499
500 rctx = ablkcipher_request_ctx(req);
501 ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
502 rctx->mode &= TDES_FLAGS_MODE_MASK;
503 dd->flags = (dd->flags & ~TDES_FLAGS_MODE_MASK) | rctx->mode;
504 dd->ctx = ctx;
505 ctx->dd = dd;
506
507 err = atmel_tdes_write_ctrl(dd);
508 if (!err)
509 err = atmel_tdes_crypt_dma_start(dd);
510 if (err) {
511 /* des_task will not finish it, so do it here */
512 atmel_tdes_finish_req(dd, err);
513 tasklet_schedule(&dd->queue_task);
514 }
515
516 return ret;
517 }
518
519
520 static int atmel_tdes_crypt(struct ablkcipher_request *req, unsigned long mode)
521 {
522 struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(
523 crypto_ablkcipher_reqtfm(req));
524 struct atmel_tdes_reqctx *rctx = ablkcipher_request_ctx(req);
525 struct atmel_tdes_dev *dd;
526
527 if (mode & TDES_FLAGS_CFB8) {
528 if (!IS_ALIGNED(req->nbytes, CFB8_BLOCK_SIZE)) {
529 pr_err("request size is not exact amount of CFB8 blocks\n");
530 return -EINVAL;
531 }
532 } else if (mode & TDES_FLAGS_CFB16) {
533 if (!IS_ALIGNED(req->nbytes, CFB16_BLOCK_SIZE)) {
534 pr_err("request size is not exact amount of CFB16 blocks\n");
535 return -EINVAL;
536 }
537 } else if (mode & TDES_FLAGS_CFB32) {
538 if (!IS_ALIGNED(req->nbytes, CFB32_BLOCK_SIZE)) {
539 pr_err("request size is not exact amount of CFB32 blocks\n");
540 return -EINVAL;
541 }
542 } else if (!IS_ALIGNED(req->nbytes, DES_BLOCK_SIZE)) {
543 pr_err("request size is not exact amount of DES blocks\n");
544 return -EINVAL;
545 }
546
547 dd = atmel_tdes_find_dev(ctx);
548 if (!dd)
549 return -ENODEV;
550
551 rctx->mode = mode;
552
553 return atmel_tdes_handle_queue(dd, req);
554 }
555
556 static int atmel_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
557 unsigned int keylen)
558 {
559 u32 tmp[DES_EXPKEY_WORDS];
560 int err;
561 struct crypto_tfm *ctfm = crypto_ablkcipher_tfm(tfm);
562
563 struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
564
565 if (keylen != DES_KEY_SIZE) {
566 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
567 return -EINVAL;
568 }
569
570 err = des_ekey(tmp, key);
571 if (err == 0 && (ctfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
572 ctfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
573 return -EINVAL;
574 }
575
576 memcpy(ctx->key, key, keylen);
577 ctx->keylen = keylen;
578
579 return 0;
580 }
581
582 static int atmel_tdes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
583 unsigned int keylen)
584 {
585 struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
586 const char *alg_name;
587
588 alg_name = crypto_tfm_alg_name(crypto_ablkcipher_tfm(tfm));
589
590 /*
591 * HW bug in cfb 3-keys mode.
592 */
593 if (strstr(alg_name, "cfb") && (keylen != 2*DES_KEY_SIZE)) {
594 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
595 return -EINVAL;
596 } else if ((keylen != 2*DES_KEY_SIZE) && (keylen != 3*DES_KEY_SIZE)) {
597 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
598 return -EINVAL;
599 }
600
601 memcpy(ctx->key, key, keylen);
602 ctx->keylen = keylen;
603
604 return 0;
605 }
606
607 static int atmel_tdes_ecb_encrypt(struct ablkcipher_request *req)
608 {
609 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT);
610 }
611
612 static int atmel_tdes_ecb_decrypt(struct ablkcipher_request *req)
613 {
614 return atmel_tdes_crypt(req, 0);
615 }
616
617 static int atmel_tdes_cbc_encrypt(struct ablkcipher_request *req)
618 {
619 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CBC);
620 }
621
622 static int atmel_tdes_cbc_decrypt(struct ablkcipher_request *req)
623 {
624 return atmel_tdes_crypt(req, TDES_FLAGS_CBC);
625 }
626 static int atmel_tdes_cfb_encrypt(struct ablkcipher_request *req)
627 {
628 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB);
629 }
630
631 static int atmel_tdes_cfb_decrypt(struct ablkcipher_request *req)
632 {
633 return atmel_tdes_crypt(req, TDES_FLAGS_CFB);
634 }
635
636 static int atmel_tdes_cfb8_encrypt(struct ablkcipher_request *req)
637 {
638 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB |
639 TDES_FLAGS_CFB8);
640 }
641
642 static int atmel_tdes_cfb8_decrypt(struct ablkcipher_request *req)
643 {
644 return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB8);
645 }
646
647 static int atmel_tdes_cfb16_encrypt(struct ablkcipher_request *req)
648 {
649 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB |
650 TDES_FLAGS_CFB16);
651 }
652
653 static int atmel_tdes_cfb16_decrypt(struct ablkcipher_request *req)
654 {
655 return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB16);
656 }
657
658 static int atmel_tdes_cfb32_encrypt(struct ablkcipher_request *req)
659 {
660 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB |
661 TDES_FLAGS_CFB32);
662 }
663
664 static int atmel_tdes_cfb32_decrypt(struct ablkcipher_request *req)
665 {
666 return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB32);
667 }
668
669 static int atmel_tdes_ofb_encrypt(struct ablkcipher_request *req)
670 {
671 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_OFB);
672 }
673
674 static int atmel_tdes_ofb_decrypt(struct ablkcipher_request *req)
675 {
676 return atmel_tdes_crypt(req, TDES_FLAGS_OFB);
677 }
678
679 static int atmel_tdes_cra_init(struct crypto_tfm *tfm)
680 {
681 tfm->crt_ablkcipher.reqsize = sizeof(struct atmel_tdes_reqctx);
682
683 return 0;
684 }
685
686 static void atmel_tdes_cra_exit(struct crypto_tfm *tfm)
687 {
688 }
689
690 static struct crypto_alg tdes_algs[] = {
691 {
692 .cra_name = "ecb(des)",
693 .cra_driver_name = "atmel-ecb-des",
694 .cra_priority = 100,
695 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
696 .cra_blocksize = DES_BLOCK_SIZE,
697 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
698 .cra_alignmask = 0,
699 .cra_type = &crypto_ablkcipher_type,
700 .cra_module = THIS_MODULE,
701 .cra_init = atmel_tdes_cra_init,
702 .cra_exit = atmel_tdes_cra_exit,
703 .cra_u.ablkcipher = {
704 .min_keysize = DES_KEY_SIZE,
705 .max_keysize = DES_KEY_SIZE,
706 .setkey = atmel_des_setkey,
707 .encrypt = atmel_tdes_ecb_encrypt,
708 .decrypt = atmel_tdes_ecb_decrypt,
709 }
710 },
711 {
712 .cra_name = "cbc(des)",
713 .cra_driver_name = "atmel-cbc-des",
714 .cra_priority = 100,
715 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
716 .cra_blocksize = DES_BLOCK_SIZE,
717 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
718 .cra_alignmask = 0,
719 .cra_type = &crypto_ablkcipher_type,
720 .cra_module = THIS_MODULE,
721 .cra_init = atmel_tdes_cra_init,
722 .cra_exit = atmel_tdes_cra_exit,
723 .cra_u.ablkcipher = {
724 .min_keysize = DES_KEY_SIZE,
725 .max_keysize = DES_KEY_SIZE,
726 .ivsize = DES_BLOCK_SIZE,
727 .setkey = atmel_des_setkey,
728 .encrypt = atmel_tdes_cbc_encrypt,
729 .decrypt = atmel_tdes_cbc_decrypt,
730 }
731 },
732 {
733 .cra_name = "cfb(des)",
734 .cra_driver_name = "atmel-cfb-des",
735 .cra_priority = 100,
736 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
737 .cra_blocksize = DES_BLOCK_SIZE,
738 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
739 .cra_alignmask = 0,
740 .cra_type = &crypto_ablkcipher_type,
741 .cra_module = THIS_MODULE,
742 .cra_init = atmel_tdes_cra_init,
743 .cra_exit = atmel_tdes_cra_exit,
744 .cra_u.ablkcipher = {
745 .min_keysize = DES_KEY_SIZE,
746 .max_keysize = DES_KEY_SIZE,
747 .ivsize = DES_BLOCK_SIZE,
748 .setkey = atmel_des_setkey,
749 .encrypt = atmel_tdes_cfb_encrypt,
750 .decrypt = atmel_tdes_cfb_decrypt,
751 }
752 },
753 {
754 .cra_name = "cfb8(des)",
755 .cra_driver_name = "atmel-cfb8-des",
756 .cra_priority = 100,
757 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
758 .cra_blocksize = CFB8_BLOCK_SIZE,
759 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
760 .cra_alignmask = 0,
761 .cra_type = &crypto_ablkcipher_type,
762 .cra_module = THIS_MODULE,
763 .cra_init = atmel_tdes_cra_init,
764 .cra_exit = atmel_tdes_cra_exit,
765 .cra_u.ablkcipher = {
766 .min_keysize = DES_KEY_SIZE,
767 .max_keysize = DES_KEY_SIZE,
768 .ivsize = DES_BLOCK_SIZE,
769 .setkey = atmel_des_setkey,
770 .encrypt = atmel_tdes_cfb8_encrypt,
771 .decrypt = atmel_tdes_cfb8_decrypt,
772 }
773 },
774 {
775 .cra_name = "cfb16(des)",
776 .cra_driver_name = "atmel-cfb16-des",
777 .cra_priority = 100,
778 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
779 .cra_blocksize = CFB16_BLOCK_SIZE,
780 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
781 .cra_alignmask = 0,
782 .cra_type = &crypto_ablkcipher_type,
783 .cra_module = THIS_MODULE,
784 .cra_init = atmel_tdes_cra_init,
785 .cra_exit = atmel_tdes_cra_exit,
786 .cra_u.ablkcipher = {
787 .min_keysize = DES_KEY_SIZE,
788 .max_keysize = DES_KEY_SIZE,
789 .ivsize = DES_BLOCK_SIZE,
790 .setkey = atmel_des_setkey,
791 .encrypt = atmel_tdes_cfb16_encrypt,
792 .decrypt = atmel_tdes_cfb16_decrypt,
793 }
794 },
795 {
796 .cra_name = "cfb32(des)",
797 .cra_driver_name = "atmel-cfb32-des",
798 .cra_priority = 100,
799 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
800 .cra_blocksize = CFB32_BLOCK_SIZE,
801 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
802 .cra_alignmask = 0,
803 .cra_type = &crypto_ablkcipher_type,
804 .cra_module = THIS_MODULE,
805 .cra_init = atmel_tdes_cra_init,
806 .cra_exit = atmel_tdes_cra_exit,
807 .cra_u.ablkcipher = {
808 .min_keysize = DES_KEY_SIZE,
809 .max_keysize = DES_KEY_SIZE,
810 .ivsize = DES_BLOCK_SIZE,
811 .setkey = atmel_des_setkey,
812 .encrypt = atmel_tdes_cfb32_encrypt,
813 .decrypt = atmel_tdes_cfb32_decrypt,
814 }
815 },
816 {
817 .cra_name = "ofb(des)",
818 .cra_driver_name = "atmel-ofb-des",
819 .cra_priority = 100,
820 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
821 .cra_blocksize = DES_BLOCK_SIZE,
822 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
823 .cra_alignmask = 0,
824 .cra_type = &crypto_ablkcipher_type,
825 .cra_module = THIS_MODULE,
826 .cra_init = atmel_tdes_cra_init,
827 .cra_exit = atmel_tdes_cra_exit,
828 .cra_u.ablkcipher = {
829 .min_keysize = DES_KEY_SIZE,
830 .max_keysize = DES_KEY_SIZE,
831 .ivsize = DES_BLOCK_SIZE,
832 .setkey = atmel_des_setkey,
833 .encrypt = atmel_tdes_ofb_encrypt,
834 .decrypt = atmel_tdes_ofb_decrypt,
835 }
836 },
837 {
838 .cra_name = "ecb(des3_ede)",
839 .cra_driver_name = "atmel-ecb-tdes",
840 .cra_priority = 100,
841 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
842 .cra_blocksize = DES_BLOCK_SIZE,
843 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
844 .cra_alignmask = 0,
845 .cra_type = &crypto_ablkcipher_type,
846 .cra_module = THIS_MODULE,
847 .cra_init = atmel_tdes_cra_init,
848 .cra_exit = atmel_tdes_cra_exit,
849 .cra_u.ablkcipher = {
850 .min_keysize = 2 * DES_KEY_SIZE,
851 .max_keysize = 3 * DES_KEY_SIZE,
852 .setkey = atmel_tdes_setkey,
853 .encrypt = atmel_tdes_ecb_encrypt,
854 .decrypt = atmel_tdes_ecb_decrypt,
855 }
856 },
857 {
858 .cra_name = "cbc(des3_ede)",
859 .cra_driver_name = "atmel-cbc-tdes",
860 .cra_priority = 100,
861 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
862 .cra_blocksize = DES_BLOCK_SIZE,
863 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
864 .cra_alignmask = 0,
865 .cra_type = &crypto_ablkcipher_type,
866 .cra_module = THIS_MODULE,
867 .cra_init = atmel_tdes_cra_init,
868 .cra_exit = atmel_tdes_cra_exit,
869 .cra_u.ablkcipher = {
870 .min_keysize = 2*DES_KEY_SIZE,
871 .max_keysize = 3*DES_KEY_SIZE,
872 .ivsize = DES_BLOCK_SIZE,
873 .setkey = atmel_tdes_setkey,
874 .encrypt = atmel_tdes_cbc_encrypt,
875 .decrypt = atmel_tdes_cbc_decrypt,
876 }
877 },
878 {
879 .cra_name = "cfb(des3_ede)",
880 .cra_driver_name = "atmel-cfb-tdes",
881 .cra_priority = 100,
882 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
883 .cra_blocksize = DES_BLOCK_SIZE,
884 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
885 .cra_alignmask = 0,
886 .cra_type = &crypto_ablkcipher_type,
887 .cra_module = THIS_MODULE,
888 .cra_init = atmel_tdes_cra_init,
889 .cra_exit = atmel_tdes_cra_exit,
890 .cra_u.ablkcipher = {
891 .min_keysize = 2*DES_KEY_SIZE,
892 .max_keysize = 2*DES_KEY_SIZE,
893 .ivsize = DES_BLOCK_SIZE,
894 .setkey = atmel_tdes_setkey,
895 .encrypt = atmel_tdes_cfb_encrypt,
896 .decrypt = atmel_tdes_cfb_decrypt,
897 }
898 },
899 {
900 .cra_name = "cfb8(des3_ede)",
901 .cra_driver_name = "atmel-cfb8-tdes",
902 .cra_priority = 100,
903 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
904 .cra_blocksize = CFB8_BLOCK_SIZE,
905 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
906 .cra_alignmask = 0,
907 .cra_type = &crypto_ablkcipher_type,
908 .cra_module = THIS_MODULE,
909 .cra_init = atmel_tdes_cra_init,
910 .cra_exit = atmel_tdes_cra_exit,
911 .cra_u.ablkcipher = {
912 .min_keysize = 2*DES_KEY_SIZE,
913 .max_keysize = 2*DES_KEY_SIZE,
914 .ivsize = DES_BLOCK_SIZE,
915 .setkey = atmel_tdes_setkey,
916 .encrypt = atmel_tdes_cfb8_encrypt,
917 .decrypt = atmel_tdes_cfb8_decrypt,
918 }
919 },
920 {
921 .cra_name = "cfb16(des3_ede)",
922 .cra_driver_name = "atmel-cfb16-tdes",
923 .cra_priority = 100,
924 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
925 .cra_blocksize = CFB16_BLOCK_SIZE,
926 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
927 .cra_alignmask = 0,
928 .cra_type = &crypto_ablkcipher_type,
929 .cra_module = THIS_MODULE,
930 .cra_init = atmel_tdes_cra_init,
931 .cra_exit = atmel_tdes_cra_exit,
932 .cra_u.ablkcipher = {
933 .min_keysize = 2*DES_KEY_SIZE,
934 .max_keysize = 2*DES_KEY_SIZE,
935 .ivsize = DES_BLOCK_SIZE,
936 .setkey = atmel_tdes_setkey,
937 .encrypt = atmel_tdes_cfb16_encrypt,
938 .decrypt = atmel_tdes_cfb16_decrypt,
939 }
940 },
941 {
942 .cra_name = "cfb32(des3_ede)",
943 .cra_driver_name = "atmel-cfb32-tdes",
944 .cra_priority = 100,
945 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
946 .cra_blocksize = CFB32_BLOCK_SIZE,
947 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
948 .cra_alignmask = 0,
949 .cra_type = &crypto_ablkcipher_type,
950 .cra_module = THIS_MODULE,
951 .cra_init = atmel_tdes_cra_init,
952 .cra_exit = atmel_tdes_cra_exit,
953 .cra_u.ablkcipher = {
954 .min_keysize = 2*DES_KEY_SIZE,
955 .max_keysize = 2*DES_KEY_SIZE,
956 .ivsize = DES_BLOCK_SIZE,
957 .setkey = atmel_tdes_setkey,
958 .encrypt = atmel_tdes_cfb32_encrypt,
959 .decrypt = atmel_tdes_cfb32_decrypt,
960 }
961 },
962 {
963 .cra_name = "ofb(des3_ede)",
964 .cra_driver_name = "atmel-ofb-tdes",
965 .cra_priority = 100,
966 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
967 .cra_blocksize = DES_BLOCK_SIZE,
968 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
969 .cra_alignmask = 0,
970 .cra_type = &crypto_ablkcipher_type,
971 .cra_module = THIS_MODULE,
972 .cra_init = atmel_tdes_cra_init,
973 .cra_exit = atmel_tdes_cra_exit,
974 .cra_u.ablkcipher = {
975 .min_keysize = 2*DES_KEY_SIZE,
976 .max_keysize = 3*DES_KEY_SIZE,
977 .ivsize = DES_BLOCK_SIZE,
978 .setkey = atmel_tdes_setkey,
979 .encrypt = atmel_tdes_ofb_encrypt,
980 .decrypt = atmel_tdes_ofb_decrypt,
981 }
982 },
983 };
984
985 static void atmel_tdes_queue_task(unsigned long data)
986 {
987 struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *)data;
988
989 atmel_tdes_handle_queue(dd, NULL);
990 }
991
992 static void atmel_tdes_done_task(unsigned long data)
993 {
994 struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *) data;
995 int err;
996
997 err = atmel_tdes_crypt_dma_stop(dd);
998
999 err = dd->err ? : err;
1000
1001 if (dd->total && !err) {
1002 err = atmel_tdes_crypt_dma_start(dd);
1003 if (!err)
1004 return;
1005 }
1006
1007 atmel_tdes_finish_req(dd, err);
1008 atmel_tdes_handle_queue(dd, NULL);
1009 }
1010
1011 static irqreturn_t atmel_tdes_irq(int irq, void *dev_id)
1012 {
1013 struct atmel_tdes_dev *tdes_dd = dev_id;
1014 u32 reg;
1015
1016 reg = atmel_tdes_read(tdes_dd, TDES_ISR);
1017 if (reg & atmel_tdes_read(tdes_dd, TDES_IMR)) {
1018 atmel_tdes_write(tdes_dd, TDES_IDR, reg);
1019 if (TDES_FLAGS_BUSY & tdes_dd->flags)
1020 tasklet_schedule(&tdes_dd->done_task);
1021 else
1022 dev_warn(tdes_dd->dev, "TDES interrupt when no active requests.\n");
1023 return IRQ_HANDLED;
1024 }
1025
1026 return IRQ_NONE;
1027 }
1028
1029 static void atmel_tdes_unregister_algs(struct atmel_tdes_dev *dd)
1030 {
1031 int i;
1032
1033 for (i = 0; i < ARRAY_SIZE(tdes_algs); i++)
1034 crypto_unregister_alg(&tdes_algs[i]);
1035 }
1036
1037 static int atmel_tdes_register_algs(struct atmel_tdes_dev *dd)
1038 {
1039 int err, i, j;
1040
1041 for (i = 0; i < ARRAY_SIZE(tdes_algs); i++) {
1042 err = crypto_register_alg(&tdes_algs[i]);
1043 if (err)
1044 goto err_tdes_algs;
1045 }
1046
1047 return 0;
1048
1049 err_tdes_algs:
1050 for (j = 0; j < i; j++)
1051 crypto_unregister_alg(&tdes_algs[j]);
1052
1053 return err;
1054 }
1055
1056 static int atmel_tdes_probe(struct platform_device *pdev)
1057 {
1058 struct atmel_tdes_dev *tdes_dd;
1059 struct device *dev = &pdev->dev;
1060 struct resource *tdes_res;
1061 unsigned long tdes_phys_size;
1062 int err;
1063
1064 tdes_dd = kzalloc(sizeof(struct atmel_tdes_dev), GFP_KERNEL);
1065 if (tdes_dd == NULL) {
1066 dev_err(dev, "unable to alloc data struct.\n");
1067 err = -ENOMEM;
1068 goto tdes_dd_err;
1069 }
1070
1071 tdes_dd->dev = dev;
1072
1073 platform_set_drvdata(pdev, tdes_dd);
1074
1075 INIT_LIST_HEAD(&tdes_dd->list);
1076
1077 tasklet_init(&tdes_dd->done_task, atmel_tdes_done_task,
1078 (unsigned long)tdes_dd);
1079 tasklet_init(&tdes_dd->queue_task, atmel_tdes_queue_task,
1080 (unsigned long)tdes_dd);
1081
1082 crypto_init_queue(&tdes_dd->queue, ATMEL_TDES_QUEUE_LENGTH);
1083
1084 tdes_dd->irq = -1;
1085
1086 /* Get the base address */
1087 tdes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1088 if (!tdes_res) {
1089 dev_err(dev, "no MEM resource info\n");
1090 err = -ENODEV;
1091 goto res_err;
1092 }
1093 tdes_dd->phys_base = tdes_res->start;
1094 tdes_phys_size = resource_size(tdes_res);
1095
1096 /* Get the IRQ */
1097 tdes_dd->irq = platform_get_irq(pdev, 0);
1098 if (tdes_dd->irq < 0) {
1099 dev_err(dev, "no IRQ resource info\n");
1100 err = tdes_dd->irq;
1101 goto res_err;
1102 }
1103
1104 err = request_irq(tdes_dd->irq, atmel_tdes_irq, IRQF_SHARED,
1105 "atmel-tdes", tdes_dd);
1106 if (err) {
1107 dev_err(dev, "unable to request tdes irq.\n");
1108 goto tdes_irq_err;
1109 }
1110
1111 /* Initializing the clock */
1112 tdes_dd->iclk = clk_get(&pdev->dev, NULL);
1113 if (IS_ERR(tdes_dd->iclk)) {
1114 dev_err(dev, "clock intialization failed.\n");
1115 err = PTR_ERR(tdes_dd->iclk);
1116 goto clk_err;
1117 }
1118
1119 tdes_dd->io_base = ioremap(tdes_dd->phys_base, tdes_phys_size);
1120 if (!tdes_dd->io_base) {
1121 dev_err(dev, "can't ioremap\n");
1122 err = -ENOMEM;
1123 goto tdes_io_err;
1124 }
1125
1126 err = atmel_tdes_dma_init(tdes_dd);
1127 if (err)
1128 goto err_tdes_dma;
1129
1130 spin_lock(&atmel_tdes.lock);
1131 list_add_tail(&tdes_dd->list, &atmel_tdes.dev_list);
1132 spin_unlock(&atmel_tdes.lock);
1133
1134 err = atmel_tdes_register_algs(tdes_dd);
1135 if (err)
1136 goto err_algs;
1137
1138 dev_info(dev, "Atmel DES/TDES\n");
1139
1140 return 0;
1141
1142 err_algs:
1143 spin_lock(&atmel_tdes.lock);
1144 list_del(&tdes_dd->list);
1145 spin_unlock(&atmel_tdes.lock);
1146 atmel_tdes_dma_cleanup(tdes_dd);
1147 err_tdes_dma:
1148 iounmap(tdes_dd->io_base);
1149 tdes_io_err:
1150 clk_put(tdes_dd->iclk);
1151 clk_err:
1152 free_irq(tdes_dd->irq, tdes_dd);
1153 tdes_irq_err:
1154 res_err:
1155 tasklet_kill(&tdes_dd->done_task);
1156 tasklet_kill(&tdes_dd->queue_task);
1157 kfree(tdes_dd);
1158 tdes_dd = NULL;
1159 tdes_dd_err:
1160 dev_err(dev, "initialization failed.\n");
1161
1162 return err;
1163 }
1164
1165 static int atmel_tdes_remove(struct platform_device *pdev)
1166 {
1167 static struct atmel_tdes_dev *tdes_dd;
1168
1169 tdes_dd = platform_get_drvdata(pdev);
1170 if (!tdes_dd)
1171 return -ENODEV;
1172 spin_lock(&atmel_tdes.lock);
1173 list_del(&tdes_dd->list);
1174 spin_unlock(&atmel_tdes.lock);
1175
1176 atmel_tdes_unregister_algs(tdes_dd);
1177
1178 tasklet_kill(&tdes_dd->done_task);
1179 tasklet_kill(&tdes_dd->queue_task);
1180
1181 atmel_tdes_dma_cleanup(tdes_dd);
1182
1183 iounmap(tdes_dd->io_base);
1184
1185 clk_put(tdes_dd->iclk);
1186
1187 if (tdes_dd->irq >= 0)
1188 free_irq(tdes_dd->irq, tdes_dd);
1189
1190 kfree(tdes_dd);
1191 tdes_dd = NULL;
1192
1193 return 0;
1194 }
1195
1196 static struct platform_driver atmel_tdes_driver = {
1197 .probe = atmel_tdes_probe,
1198 .remove = atmel_tdes_remove,
1199 .driver = {
1200 .name = "atmel_tdes",
1201 .owner = THIS_MODULE,
1202 },
1203 };
1204
1205 module_platform_driver(atmel_tdes_driver);
1206
1207 MODULE_DESCRIPTION("Atmel DES/TDES hw acceleration support.");
1208 MODULE_LICENSE("GPL v2");
1209 MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
Linux 2.6 libata-dev (mirror)