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Linux 3.12.39
[linux/fpc-iii.git] / drivers / crypto / atmel-tdes.c
blob4a99564a08e68d6577be82f42d3eb4762281235c
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 <linux/platform_data/crypto-atmel.h>
42 #include "atmel-tdes-regs.h"
43
44 /* TDES flags */
45 #define TDES_FLAGS_MODE_MASK 0x00ff
46 #define TDES_FLAGS_ENCRYPT BIT(0)
47 #define TDES_FLAGS_CBC BIT(1)
48 #define TDES_FLAGS_CFB BIT(2)
49 #define TDES_FLAGS_CFB8 BIT(3)
50 #define TDES_FLAGS_CFB16 BIT(4)
51 #define TDES_FLAGS_CFB32 BIT(5)
52 #define TDES_FLAGS_CFB64 BIT(6)
53 #define TDES_FLAGS_OFB BIT(7)
54
55 #define TDES_FLAGS_INIT BIT(16)
56 #define TDES_FLAGS_FAST BIT(17)
57 #define TDES_FLAGS_BUSY BIT(18)
58 #define TDES_FLAGS_DMA BIT(19)
59
60 #define ATMEL_TDES_QUEUE_LENGTH 50
61
62 #define CFB8_BLOCK_SIZE 1
63 #define CFB16_BLOCK_SIZE 2
64 #define CFB32_BLOCK_SIZE 4
65
66 struct atmel_tdes_caps {
67 bool has_dma;
68 u32 has_cfb_3keys;
69 };
70
71 struct atmel_tdes_dev;
72
73 struct atmel_tdes_ctx {
74 struct atmel_tdes_dev *dd;
75
76 int keylen;
77 u32 key[3*DES_KEY_SIZE / sizeof(u32)];
78 unsigned long flags;
79
80 u16 block_size;
81 };
82
83 struct atmel_tdes_reqctx {
84 unsigned long mode;
85 };
86
87 struct atmel_tdes_dma {
88 struct dma_chan *chan;
89 struct dma_slave_config dma_conf;
90 };
91
92 struct atmel_tdes_dev {
93 struct list_head list;
94 unsigned long phys_base;
95 void __iomem *io_base;
96
97 struct atmel_tdes_ctx *ctx;
98 struct device *dev;
99 struct clk *iclk;
100 int irq;
101
102 unsigned long flags;
103 int err;
104
105 spinlock_t lock;
106 struct crypto_queue queue;
107
108 struct tasklet_struct done_task;
109 struct tasklet_struct queue_task;
110
111 struct ablkcipher_request *req;
112 size_t total;
113
114 struct scatterlist *in_sg;
115 unsigned int nb_in_sg;
116 size_t in_offset;
117 struct scatterlist *out_sg;
118 unsigned int nb_out_sg;
119 size_t out_offset;
120
121 size_t buflen;
122 size_t dma_size;
123
124 void *buf_in;
125 int dma_in;
126 dma_addr_t dma_addr_in;
127 struct atmel_tdes_dma dma_lch_in;
128
129 void *buf_out;
130 int dma_out;
131 dma_addr_t dma_addr_out;
132 struct atmel_tdes_dma dma_lch_out;
133
134 struct atmel_tdes_caps caps;
135
136 u32 hw_version;
137 };
138
139 struct atmel_tdes_drv {
140 struct list_head dev_list;
141 spinlock_t lock;
142 };
143
144 static struct atmel_tdes_drv atmel_tdes = {
145 .dev_list = LIST_HEAD_INIT(atmel_tdes.dev_list),
146 .lock = __SPIN_LOCK_UNLOCKED(atmel_tdes.lock),
147 };
148
149 static int atmel_tdes_sg_copy(struct scatterlist **sg, size_t *offset,
150 void *buf, size_t buflen, size_t total, int out)
151 {
152 unsigned int count, off = 0;
153
154 while (buflen && total) {
155 count = min((*sg)->length - *offset, total);
156 count = min(count, buflen);
157
158 if (!count)
159 return off;
160
161 scatterwalk_map_and_copy(buf + off, *sg, *offset, count, out);
162
163 off += count;
164 buflen -= count;
165 *offset += count;
166 total -= count;
167
168 if (*offset == (*sg)->length) {
169 *sg = sg_next(*sg);
170 if (*sg)
171 *offset = 0;
172 else
173 total = 0;
174 }
175 }
176
177 return off;
178 }
179
180 static inline u32 atmel_tdes_read(struct atmel_tdes_dev *dd, u32 offset)
181 {
182 return readl_relaxed(dd->io_base + offset);
183 }
184
185 static inline void atmel_tdes_write(struct atmel_tdes_dev *dd,
186 u32 offset, u32 value)
187 {
188 writel_relaxed(value, dd->io_base + offset);
189 }
190
191 static void atmel_tdes_write_n(struct atmel_tdes_dev *dd, u32 offset,
192 u32 *value, int count)
193 {
194 for (; count--; value++, offset += 4)
195 atmel_tdes_write(dd, offset, *value);
196 }
197
198 static struct atmel_tdes_dev *atmel_tdes_find_dev(struct atmel_tdes_ctx *ctx)
199 {
200 struct atmel_tdes_dev *tdes_dd = NULL;
201 struct atmel_tdes_dev *tmp;
202
203 spin_lock_bh(&atmel_tdes.lock);
204 if (!ctx->dd) {
205 list_for_each_entry(tmp, &atmel_tdes.dev_list, list) {
206 tdes_dd = tmp;
207 break;
208 }
209 ctx->dd = tdes_dd;
210 } else {
211 tdes_dd = ctx->dd;
212 }
213 spin_unlock_bh(&atmel_tdes.lock);
214
215 return tdes_dd;
216 }
217
218 static int atmel_tdes_hw_init(struct atmel_tdes_dev *dd)
219 {
220 clk_prepare_enable(dd->iclk);
221
222 if (!(dd->flags & TDES_FLAGS_INIT)) {
223 atmel_tdes_write(dd, TDES_CR, TDES_CR_SWRST);
224 dd->flags |= TDES_FLAGS_INIT;
225 dd->err = 0;
226 }
227
228 return 0;
229 }
230
231 static inline unsigned int atmel_tdes_get_version(struct atmel_tdes_dev *dd)
232 {
233 return atmel_tdes_read(dd, TDES_HW_VERSION) & 0x00000fff;
234 }
235
236 static void atmel_tdes_hw_version_init(struct atmel_tdes_dev *dd)
237 {
238 atmel_tdes_hw_init(dd);
239
240 dd->hw_version = atmel_tdes_get_version(dd);
241
242 dev_info(dd->dev,
243 "version: 0x%x\n", dd->hw_version);
244
245 clk_disable_unprepare(dd->iclk);
246 }
247
248 static void atmel_tdes_dma_callback(void *data)
249 {
250 struct atmel_tdes_dev *dd = data;
251
252 /* dma_lch_out - completed */
253 tasklet_schedule(&dd->done_task);
254 }
255
256 static int atmel_tdes_write_ctrl(struct atmel_tdes_dev *dd)
257 {
258 int err;
259 u32 valcr = 0, valmr = TDES_MR_SMOD_PDC;
260
261 err = atmel_tdes_hw_init(dd);
262
263 if (err)
264 return err;
265
266 if (!dd->caps.has_dma)
267 atmel_tdes_write(dd, TDES_PTCR,
268 TDES_PTCR_TXTDIS | TDES_PTCR_RXTDIS);
269
270 /* MR register must be set before IV registers */
271 if (dd->ctx->keylen > (DES_KEY_SIZE << 1)) {
272 valmr |= TDES_MR_KEYMOD_3KEY;
273 valmr |= TDES_MR_TDESMOD_TDES;
274 } else if (dd->ctx->keylen > DES_KEY_SIZE) {
275 valmr |= TDES_MR_KEYMOD_2KEY;
276 valmr |= TDES_MR_TDESMOD_TDES;
277 } else {
278 valmr |= TDES_MR_TDESMOD_DES;
279 }
280
281 if (dd->flags & TDES_FLAGS_CBC) {
282 valmr |= TDES_MR_OPMOD_CBC;
283 } else if (dd->flags & TDES_FLAGS_CFB) {
284 valmr |= TDES_MR_OPMOD_CFB;
285
286 if (dd->flags & TDES_FLAGS_CFB8)
287 valmr |= TDES_MR_CFBS_8b;
288 else if (dd->flags & TDES_FLAGS_CFB16)
289 valmr |= TDES_MR_CFBS_16b;
290 else if (dd->flags & TDES_FLAGS_CFB32)
291 valmr |= TDES_MR_CFBS_32b;
292 else if (dd->flags & TDES_FLAGS_CFB64)
293 valmr |= TDES_MR_CFBS_64b;
294 } else if (dd->flags & TDES_FLAGS_OFB) {
295 valmr |= TDES_MR_OPMOD_OFB;
296 }
297
298 if ((dd->flags & TDES_FLAGS_ENCRYPT) || (dd->flags & TDES_FLAGS_OFB))
299 valmr |= TDES_MR_CYPHER_ENC;
300
301 atmel_tdes_write(dd, TDES_CR, valcr);
302 atmel_tdes_write(dd, TDES_MR, valmr);
303
304 atmel_tdes_write_n(dd, TDES_KEY1W1R, dd->ctx->key,
305 dd->ctx->keylen >> 2);
306
307 if (((dd->flags & TDES_FLAGS_CBC) || (dd->flags & TDES_FLAGS_CFB) ||
308 (dd->flags & TDES_FLAGS_OFB)) && dd->req->info) {
309 atmel_tdes_write_n(dd, TDES_IV1R, dd->req->info, 2);
310 }
311
312 return 0;
313 }
314
315 static int atmel_tdes_crypt_pdc_stop(struct atmel_tdes_dev *dd)
316 {
317 int err = 0;
318 size_t count;
319
320 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
321
322 if (dd->flags & TDES_FLAGS_FAST) {
323 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
324 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
325 } else {
326 dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
327 dd->dma_size, DMA_FROM_DEVICE);
328
329 /* copy data */
330 count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset,
331 dd->buf_out, dd->buflen, dd->dma_size, 1);
332 if (count != dd->dma_size) {
333 err = -EINVAL;
334 pr_err("not all data converted: %u\n", count);
335 }
336 }
337
338 return err;
339 }
340
341 static int atmel_tdes_buff_init(struct atmel_tdes_dev *dd)
342 {
343 int err = -ENOMEM;
344
345 dd->buf_in = (void *)__get_free_pages(GFP_KERNEL, 0);
346 dd->buf_out = (void *)__get_free_pages(GFP_KERNEL, 0);
347 dd->buflen = PAGE_SIZE;
348 dd->buflen &= ~(DES_BLOCK_SIZE - 1);
349
350 if (!dd->buf_in || !dd->buf_out) {
351 dev_err(dd->dev, "unable to alloc pages.\n");
352 goto err_alloc;
353 }
354
355 /* MAP here */
356 dd->dma_addr_in = dma_map_single(dd->dev, dd->buf_in,
357 dd->buflen, DMA_TO_DEVICE);
358 if (dma_mapping_error(dd->dev, dd->dma_addr_in)) {
359 dev_err(dd->dev, "dma %d bytes error\n", dd->buflen);
360 err = -EINVAL;
361 goto err_map_in;
362 }
363
364 dd->dma_addr_out = dma_map_single(dd->dev, dd->buf_out,
365 dd->buflen, DMA_FROM_DEVICE);
366 if (dma_mapping_error(dd->dev, dd->dma_addr_out)) {
367 dev_err(dd->dev, "dma %d bytes error\n", dd->buflen);
368 err = -EINVAL;
369 goto err_map_out;
370 }
371
372 return 0;
373
374 err_map_out:
375 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
376 DMA_TO_DEVICE);
377 err_map_in:
378 free_page((unsigned long)dd->buf_out);
379 free_page((unsigned long)dd->buf_in);
380 err_alloc:
381 if (err)
382 pr_err("error: %d\n", err);
383 return err;
384 }
385
386 static void atmel_tdes_buff_cleanup(struct atmel_tdes_dev *dd)
387 {
388 dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen,
389 DMA_FROM_DEVICE);
390 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
391 DMA_TO_DEVICE);
392 free_page((unsigned long)dd->buf_out);
393 free_page((unsigned long)dd->buf_in);
394 }
395
396 static int atmel_tdes_crypt_pdc(struct crypto_tfm *tfm, dma_addr_t dma_addr_in,
397 dma_addr_t dma_addr_out, int length)
398 {
399 struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm);
400 struct atmel_tdes_dev *dd = ctx->dd;
401 int len32;
402
403 dd->dma_size = length;
404
405 if (!(dd->flags & TDES_FLAGS_FAST)) {
406 dma_sync_single_for_device(dd->dev, dma_addr_in, length,
407 DMA_TO_DEVICE);
408 }
409
410 if ((dd->flags & TDES_FLAGS_CFB) && (dd->flags & TDES_FLAGS_CFB8))
411 len32 = DIV_ROUND_UP(length, sizeof(u8));
412 else if ((dd->flags & TDES_FLAGS_CFB) && (dd->flags & TDES_FLAGS_CFB16))
413 len32 = DIV_ROUND_UP(length, sizeof(u16));
414 else
415 len32 = DIV_ROUND_UP(length, sizeof(u32));
416
417 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
418 atmel_tdes_write(dd, TDES_TPR, dma_addr_in);
419 atmel_tdes_write(dd, TDES_TCR, len32);
420 atmel_tdes_write(dd, TDES_RPR, dma_addr_out);
421 atmel_tdes_write(dd, TDES_RCR, len32);
422
423 /* Enable Interrupt */
424 atmel_tdes_write(dd, TDES_IER, TDES_INT_ENDRX);
425
426 /* Start DMA transfer */
427 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTEN | TDES_PTCR_RXTEN);
428
429 return 0;
430 }
431
432 static int atmel_tdes_crypt_dma(struct crypto_tfm *tfm, dma_addr_t dma_addr_in,
433 dma_addr_t dma_addr_out, int length)
434 {
435 struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm);
436 struct atmel_tdes_dev *dd = ctx->dd;
437 struct scatterlist sg[2];
438 struct dma_async_tx_descriptor *in_desc, *out_desc;
439
440 dd->dma_size = length;
441
442 if (!(dd->flags & TDES_FLAGS_FAST)) {
443 dma_sync_single_for_device(dd->dev, dma_addr_in, length,
444 DMA_TO_DEVICE);
445 }
446
447 if (dd->flags & TDES_FLAGS_CFB8) {
448 dd->dma_lch_in.dma_conf.dst_addr_width =
449 DMA_SLAVE_BUSWIDTH_1_BYTE;
450 dd->dma_lch_out.dma_conf.src_addr_width =
451 DMA_SLAVE_BUSWIDTH_1_BYTE;
452 } else if (dd->flags & TDES_FLAGS_CFB16) {
453 dd->dma_lch_in.dma_conf.dst_addr_width =
454 DMA_SLAVE_BUSWIDTH_2_BYTES;
455 dd->dma_lch_out.dma_conf.src_addr_width =
456 DMA_SLAVE_BUSWIDTH_2_BYTES;
457 } else {
458 dd->dma_lch_in.dma_conf.dst_addr_width =
459 DMA_SLAVE_BUSWIDTH_4_BYTES;
460 dd->dma_lch_out.dma_conf.src_addr_width =
461 DMA_SLAVE_BUSWIDTH_4_BYTES;
462 }
463
464 dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf);
465 dmaengine_slave_config(dd->dma_lch_out.chan, &dd->dma_lch_out.dma_conf);
466
467 dd->flags |= TDES_FLAGS_DMA;
468
469 sg_init_table(&sg[0], 1);
470 sg_dma_address(&sg[0]) = dma_addr_in;
471 sg_dma_len(&sg[0]) = length;
472
473 sg_init_table(&sg[1], 1);
474 sg_dma_address(&sg[1]) = dma_addr_out;
475 sg_dma_len(&sg[1]) = length;
476
477 in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, &sg[0],
478 1, DMA_MEM_TO_DEV,
479 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
480 if (!in_desc)
481 return -EINVAL;
482
483 out_desc = dmaengine_prep_slave_sg(dd->dma_lch_out.chan, &sg[1],
484 1, DMA_DEV_TO_MEM,
485 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
486 if (!out_desc)
487 return -EINVAL;
488
489 out_desc->callback = atmel_tdes_dma_callback;
490 out_desc->callback_param = dd;
491
492 dmaengine_submit(out_desc);
493 dma_async_issue_pending(dd->dma_lch_out.chan);
494
495 dmaengine_submit(in_desc);
496 dma_async_issue_pending(dd->dma_lch_in.chan);
497
498 return 0;
499 }
500
501 static int atmel_tdes_crypt_start(struct atmel_tdes_dev *dd)
502 {
503 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(
504 crypto_ablkcipher_reqtfm(dd->req));
505 int err, fast = 0, in, out;
506 size_t count;
507 dma_addr_t addr_in, addr_out;
508
509 if ((!dd->in_offset) && (!dd->out_offset)) {
510 /* check for alignment */
511 in = IS_ALIGNED((u32)dd->in_sg->offset, sizeof(u32)) &&
512 IS_ALIGNED(dd->in_sg->length, dd->ctx->block_size);
513 out = IS_ALIGNED((u32)dd->out_sg->offset, sizeof(u32)) &&
514 IS_ALIGNED(dd->out_sg->length, dd->ctx->block_size);
515 fast = in && out;
516
517 if (sg_dma_len(dd->in_sg) != sg_dma_len(dd->out_sg))
518 fast = 0;
519 }
520
521
522 if (fast) {
523 count = min(dd->total, sg_dma_len(dd->in_sg));
524 count = min(count, sg_dma_len(dd->out_sg));
525
526 err = dma_map_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
527 if (!err) {
528 dev_err(dd->dev, "dma_map_sg() error\n");
529 return -EINVAL;
530 }
531
532 err = dma_map_sg(dd->dev, dd->out_sg, 1,
533 DMA_FROM_DEVICE);
534 if (!err) {
535 dev_err(dd->dev, "dma_map_sg() error\n");
536 dma_unmap_sg(dd->dev, dd->in_sg, 1,
537 DMA_TO_DEVICE);
538 return -EINVAL;
539 }
540
541 addr_in = sg_dma_address(dd->in_sg);
542 addr_out = sg_dma_address(dd->out_sg);
543
544 dd->flags |= TDES_FLAGS_FAST;
545
546 } else {
547 /* use cache buffers */
548 count = atmel_tdes_sg_copy(&dd->in_sg, &dd->in_offset,
549 dd->buf_in, dd->buflen, dd->total, 0);
550
551 addr_in = dd->dma_addr_in;
552 addr_out = dd->dma_addr_out;
553
554 dd->flags &= ~TDES_FLAGS_FAST;
555 }
556
557 dd->total -= count;
558
559 if (dd->caps.has_dma)
560 err = atmel_tdes_crypt_dma(tfm, addr_in, addr_out, count);
561 else
562 err = atmel_tdes_crypt_pdc(tfm, addr_in, addr_out, count);
563
564 if (err && (dd->flags & TDES_FLAGS_FAST)) {
565 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
566 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_TO_DEVICE);
567 }
568
569 return err;
570 }
571
572 static void atmel_tdes_finish_req(struct atmel_tdes_dev *dd, int err)
573 {
574 struct ablkcipher_request *req = dd->req;
575
576 clk_disable_unprepare(dd->iclk);
577
578 dd->flags &= ~TDES_FLAGS_BUSY;
579
580 req->base.complete(&req->base, err);
581 }
582
583 static int atmel_tdes_handle_queue(struct atmel_tdes_dev *dd,
584 struct ablkcipher_request *req)
585 {
586 struct crypto_async_request *async_req, *backlog;
587 struct atmel_tdes_ctx *ctx;
588 struct atmel_tdes_reqctx *rctx;
589 unsigned long flags;
590 int err, ret = 0;
591
592 spin_lock_irqsave(&dd->lock, flags);
593 if (req)
594 ret = ablkcipher_enqueue_request(&dd->queue, req);
595 if (dd->flags & TDES_FLAGS_BUSY) {
596 spin_unlock_irqrestore(&dd->lock, flags);
597 return ret;
598 }
599 backlog = crypto_get_backlog(&dd->queue);
600 async_req = crypto_dequeue_request(&dd->queue);
601 if (async_req)
602 dd->flags |= TDES_FLAGS_BUSY;
603 spin_unlock_irqrestore(&dd->lock, flags);
604
605 if (!async_req)
606 return ret;
607
608 if (backlog)
609 backlog->complete(backlog, -EINPROGRESS);
610
611 req = ablkcipher_request_cast(async_req);
612
613 /* assign new request to device */
614 dd->req = req;
615 dd->total = req->nbytes;
616 dd->in_offset = 0;
617 dd->in_sg = req->src;
618 dd->out_offset = 0;
619 dd->out_sg = req->dst;
620
621 rctx = ablkcipher_request_ctx(req);
622 ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
623 rctx->mode &= TDES_FLAGS_MODE_MASK;
624 dd->flags = (dd->flags & ~TDES_FLAGS_MODE_MASK) | rctx->mode;
625 dd->ctx = ctx;
626 ctx->dd = dd;
627
628 err = atmel_tdes_write_ctrl(dd);
629 if (!err)
630 err = atmel_tdes_crypt_start(dd);
631 if (err) {
632 /* des_task will not finish it, so do it here */
633 atmel_tdes_finish_req(dd, err);
634 tasklet_schedule(&dd->queue_task);
635 }
636
637 return ret;
638 }
639
640 static int atmel_tdes_crypt_dma_stop(struct atmel_tdes_dev *dd)
641 {
642 int err = -EINVAL;
643 size_t count;
644
645 if (dd->flags & TDES_FLAGS_DMA) {
646 err = 0;
647 if (dd->flags & TDES_FLAGS_FAST) {
648 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
649 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
650 } else {
651 dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
652 dd->dma_size, DMA_FROM_DEVICE);
653
654 /* copy data */
655 count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset,
656 dd->buf_out, dd->buflen, dd->dma_size, 1);
657 if (count != dd->dma_size) {
658 err = -EINVAL;
659 pr_err("not all data converted: %u\n", count);
660 }
661 }
662 }
663 return err;
664 }
665
666 static int atmel_tdes_crypt(struct ablkcipher_request *req, unsigned long mode)
667 {
668 struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(
669 crypto_ablkcipher_reqtfm(req));
670 struct atmel_tdes_reqctx *rctx = ablkcipher_request_ctx(req);
671
672 if (mode & TDES_FLAGS_CFB8) {
673 if (!IS_ALIGNED(req->nbytes, CFB8_BLOCK_SIZE)) {
674 pr_err("request size is not exact amount of CFB8 blocks\n");
675 return -EINVAL;
676 }
677 ctx->block_size = CFB8_BLOCK_SIZE;
678 } else if (mode & TDES_FLAGS_CFB16) {
679 if (!IS_ALIGNED(req->nbytes, CFB16_BLOCK_SIZE)) {
680 pr_err("request size is not exact amount of CFB16 blocks\n");
681 return -EINVAL;
682 }
683 ctx->block_size = CFB16_BLOCK_SIZE;
684 } else if (mode & TDES_FLAGS_CFB32) {
685 if (!IS_ALIGNED(req->nbytes, CFB32_BLOCK_SIZE)) {
686 pr_err("request size is not exact amount of CFB32 blocks\n");
687 return -EINVAL;
688 }
689 ctx->block_size = CFB32_BLOCK_SIZE;
690 } else {
691 if (!IS_ALIGNED(req->nbytes, DES_BLOCK_SIZE)) {
692 pr_err("request size is not exact amount of DES blocks\n");
693 return -EINVAL;
694 }
695 ctx->block_size = DES_BLOCK_SIZE;
696 }
697
698 rctx->mode = mode;
699
700 return atmel_tdes_handle_queue(ctx->dd, req);
701 }
702
703 static bool atmel_tdes_filter(struct dma_chan *chan, void *slave)
704 {
705 struct at_dma_slave *sl = slave;
706
707 if (sl && sl->dma_dev == chan->device->dev) {
708 chan->private = sl;
709 return true;
710 } else {
711 return false;
712 }
713 }
714
715 static int atmel_tdes_dma_init(struct atmel_tdes_dev *dd,
716 struct crypto_platform_data *pdata)
717 {
718 int err = -ENOMEM;
719 dma_cap_mask_t mask_in, mask_out;
720
721 if (pdata && pdata->dma_slave->txdata.dma_dev &&
722 pdata->dma_slave->rxdata.dma_dev) {
723
724 /* Try to grab 2 DMA channels */
725 dma_cap_zero(mask_in);
726 dma_cap_set(DMA_SLAVE, mask_in);
727
728 dd->dma_lch_in.chan = dma_request_channel(mask_in,
729 atmel_tdes_filter, &pdata->dma_slave->rxdata);
730
731 if (!dd->dma_lch_in.chan)
732 goto err_dma_in;
733
734 dd->dma_lch_in.dma_conf.direction = DMA_MEM_TO_DEV;
735 dd->dma_lch_in.dma_conf.dst_addr = dd->phys_base +
736 TDES_IDATA1R;
737 dd->dma_lch_in.dma_conf.src_maxburst = 1;
738 dd->dma_lch_in.dma_conf.src_addr_width =
739 DMA_SLAVE_BUSWIDTH_4_BYTES;
740 dd->dma_lch_in.dma_conf.dst_maxburst = 1;
741 dd->dma_lch_in.dma_conf.dst_addr_width =
742 DMA_SLAVE_BUSWIDTH_4_BYTES;
743 dd->dma_lch_in.dma_conf.device_fc = false;
744
745 dma_cap_zero(mask_out);
746 dma_cap_set(DMA_SLAVE, mask_out);
747 dd->dma_lch_out.chan = dma_request_channel(mask_out,
748 atmel_tdes_filter, &pdata->dma_slave->txdata);
749
750 if (!dd->dma_lch_out.chan)
751 goto err_dma_out;
752
753 dd->dma_lch_out.dma_conf.direction = DMA_DEV_TO_MEM;
754 dd->dma_lch_out.dma_conf.src_addr = dd->phys_base +
755 TDES_ODATA1R;
756 dd->dma_lch_out.dma_conf.src_maxburst = 1;
757 dd->dma_lch_out.dma_conf.src_addr_width =
758 DMA_SLAVE_BUSWIDTH_4_BYTES;
759 dd->dma_lch_out.dma_conf.dst_maxburst = 1;
760 dd->dma_lch_out.dma_conf.dst_addr_width =
761 DMA_SLAVE_BUSWIDTH_4_BYTES;
762 dd->dma_lch_out.dma_conf.device_fc = false;
763
764 return 0;
765 } else {
766 return -ENODEV;
767 }
768
769 err_dma_out:
770 dma_release_channel(dd->dma_lch_in.chan);
771 err_dma_in:
772 return err;
773 }
774
775 static void atmel_tdes_dma_cleanup(struct atmel_tdes_dev *dd)
776 {
777 dma_release_channel(dd->dma_lch_in.chan);
778 dma_release_channel(dd->dma_lch_out.chan);
779 }
780
781 static int atmel_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
782 unsigned int keylen)
783 {
784 u32 tmp[DES_EXPKEY_WORDS];
785 int err;
786 struct crypto_tfm *ctfm = crypto_ablkcipher_tfm(tfm);
787
788 struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
789
790 if (keylen != DES_KEY_SIZE) {
791 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
792 return -EINVAL;
793 }
794
795 err = des_ekey(tmp, key);
796 if (err == 0 && (ctfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
797 ctfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
798 return -EINVAL;
799 }
800
801 memcpy(ctx->key, key, keylen);
802 ctx->keylen = keylen;
803
804 return 0;
805 }
806
807 static int atmel_tdes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
808 unsigned int keylen)
809 {
810 struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
811 const char *alg_name;
812
813 alg_name = crypto_tfm_alg_name(crypto_ablkcipher_tfm(tfm));
814
815 /*
816 * HW bug in cfb 3-keys mode.
817 */
818 if (!ctx->dd->caps.has_cfb_3keys && strstr(alg_name, "cfb")
819 && (keylen != 2*DES_KEY_SIZE)) {
820 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
821 return -EINVAL;
822 } else if ((keylen != 2*DES_KEY_SIZE) && (keylen != 3*DES_KEY_SIZE)) {
823 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
824 return -EINVAL;
825 }
826
827 memcpy(ctx->key, key, keylen);
828 ctx->keylen = keylen;
829
830 return 0;
831 }
832
833 static int atmel_tdes_ecb_encrypt(struct ablkcipher_request *req)
834 {
835 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT);
836 }
837
838 static int atmel_tdes_ecb_decrypt(struct ablkcipher_request *req)
839 {
840 return atmel_tdes_crypt(req, 0);
841 }
842
843 static int atmel_tdes_cbc_encrypt(struct ablkcipher_request *req)
844 {
845 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CBC);
846 }
847
848 static int atmel_tdes_cbc_decrypt(struct ablkcipher_request *req)
849 {
850 return atmel_tdes_crypt(req, TDES_FLAGS_CBC);
851 }
852 static int atmel_tdes_cfb_encrypt(struct ablkcipher_request *req)
853 {
854 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB);
855 }
856
857 static int atmel_tdes_cfb_decrypt(struct ablkcipher_request *req)
858 {
859 return atmel_tdes_crypt(req, TDES_FLAGS_CFB);
860 }
861
862 static int atmel_tdes_cfb8_encrypt(struct ablkcipher_request *req)
863 {
864 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB |
865 TDES_FLAGS_CFB8);
866 }
867
868 static int atmel_tdes_cfb8_decrypt(struct ablkcipher_request *req)
869 {
870 return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB8);
871 }
872
873 static int atmel_tdes_cfb16_encrypt(struct ablkcipher_request *req)
874 {
875 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB |
876 TDES_FLAGS_CFB16);
877 }
878
879 static int atmel_tdes_cfb16_decrypt(struct ablkcipher_request *req)
880 {
881 return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB16);
882 }
883
884 static int atmel_tdes_cfb32_encrypt(struct ablkcipher_request *req)
885 {
886 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB |
887 TDES_FLAGS_CFB32);
888 }
889
890 static int atmel_tdes_cfb32_decrypt(struct ablkcipher_request *req)
891 {
892 return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB32);
893 }
894
895 static int atmel_tdes_ofb_encrypt(struct ablkcipher_request *req)
896 {
897 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_OFB);
898 }
899
900 static int atmel_tdes_ofb_decrypt(struct ablkcipher_request *req)
901 {
902 return atmel_tdes_crypt(req, TDES_FLAGS_OFB);
903 }
904
905 static int atmel_tdes_cra_init(struct crypto_tfm *tfm)
906 {
907 struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm);
908 struct atmel_tdes_dev *dd;
909
910 tfm->crt_ablkcipher.reqsize = sizeof(struct atmel_tdes_reqctx);
911
912 dd = atmel_tdes_find_dev(ctx);
913 if (!dd)
914 return -ENODEV;
915
916 return 0;
917 }
918
919 static void atmel_tdes_cra_exit(struct crypto_tfm *tfm)
920 {
921 }
922
923 static struct crypto_alg tdes_algs[] = {
924 {
925 .cra_name = "ecb(des)",
926 .cra_driver_name = "atmel-ecb-des",
927 .cra_priority = 100,
928 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
929 .cra_blocksize = DES_BLOCK_SIZE,
930 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
931 .cra_alignmask = 0x7,
932 .cra_type = &crypto_ablkcipher_type,
933 .cra_module = THIS_MODULE,
934 .cra_init = atmel_tdes_cra_init,
935 .cra_exit = atmel_tdes_cra_exit,
936 .cra_u.ablkcipher = {
937 .min_keysize = DES_KEY_SIZE,
938 .max_keysize = DES_KEY_SIZE,
939 .setkey = atmel_des_setkey,
940 .encrypt = atmel_tdes_ecb_encrypt,
941 .decrypt = atmel_tdes_ecb_decrypt,
942 }
943 },
944 {
945 .cra_name = "cbc(des)",
946 .cra_driver_name = "atmel-cbc-des",
947 .cra_priority = 100,
948 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
949 .cra_blocksize = DES_BLOCK_SIZE,
950 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
951 .cra_alignmask = 0x7,
952 .cra_type = &crypto_ablkcipher_type,
953 .cra_module = THIS_MODULE,
954 .cra_init = atmel_tdes_cra_init,
955 .cra_exit = atmel_tdes_cra_exit,
956 .cra_u.ablkcipher = {
957 .min_keysize = DES_KEY_SIZE,
958 .max_keysize = DES_KEY_SIZE,
959 .ivsize = DES_BLOCK_SIZE,
960 .setkey = atmel_des_setkey,
961 .encrypt = atmel_tdes_cbc_encrypt,
962 .decrypt = atmel_tdes_cbc_decrypt,
963 }
964 },
965 {
966 .cra_name = "cfb(des)",
967 .cra_driver_name = "atmel-cfb-des",
968 .cra_priority = 100,
969 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
970 .cra_blocksize = DES_BLOCK_SIZE,
971 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
972 .cra_alignmask = 0x7,
973 .cra_type = &crypto_ablkcipher_type,
974 .cra_module = THIS_MODULE,
975 .cra_init = atmel_tdes_cra_init,
976 .cra_exit = atmel_tdes_cra_exit,
977 .cra_u.ablkcipher = {
978 .min_keysize = DES_KEY_SIZE,
979 .max_keysize = DES_KEY_SIZE,
980 .ivsize = DES_BLOCK_SIZE,
981 .setkey = atmel_des_setkey,
982 .encrypt = atmel_tdes_cfb_encrypt,
983 .decrypt = atmel_tdes_cfb_decrypt,
984 }
985 },
986 {
987 .cra_name = "cfb8(des)",
988 .cra_driver_name = "atmel-cfb8-des",
989 .cra_priority = 100,
990 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
991 .cra_blocksize = CFB8_BLOCK_SIZE,
992 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
993 .cra_alignmask = 0,
994 .cra_type = &crypto_ablkcipher_type,
995 .cra_module = THIS_MODULE,
996 .cra_init = atmel_tdes_cra_init,
997 .cra_exit = atmel_tdes_cra_exit,
998 .cra_u.ablkcipher = {
999 .min_keysize = DES_KEY_SIZE,
1000 .max_keysize = DES_KEY_SIZE,
1001 .ivsize = DES_BLOCK_SIZE,
1002 .setkey = atmel_des_setkey,
1003 .encrypt = atmel_tdes_cfb8_encrypt,
1004 .decrypt = atmel_tdes_cfb8_decrypt,
1005 }
1006 },
1007 {
1008 .cra_name = "cfb16(des)",
1009 .cra_driver_name = "atmel-cfb16-des",
1010 .cra_priority = 100,
1011 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1012 .cra_blocksize = CFB16_BLOCK_SIZE,
1013 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1014 .cra_alignmask = 0x1,
1015 .cra_type = &crypto_ablkcipher_type,
1016 .cra_module = THIS_MODULE,
1017 .cra_init = atmel_tdes_cra_init,
1018 .cra_exit = atmel_tdes_cra_exit,
1019 .cra_u.ablkcipher = {
1020 .min_keysize = DES_KEY_SIZE,
1021 .max_keysize = DES_KEY_SIZE,
1022 .ivsize = DES_BLOCK_SIZE,
1023 .setkey = atmel_des_setkey,
1024 .encrypt = atmel_tdes_cfb16_encrypt,
1025 .decrypt = atmel_tdes_cfb16_decrypt,
1026 }
1027 },
1028 {
1029 .cra_name = "cfb32(des)",
1030 .cra_driver_name = "atmel-cfb32-des",
1031 .cra_priority = 100,
1032 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1033 .cra_blocksize = CFB32_BLOCK_SIZE,
1034 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1035 .cra_alignmask = 0x3,
1036 .cra_type = &crypto_ablkcipher_type,
1037 .cra_module = THIS_MODULE,
1038 .cra_init = atmel_tdes_cra_init,
1039 .cra_exit = atmel_tdes_cra_exit,
1040 .cra_u.ablkcipher = {
1041 .min_keysize = DES_KEY_SIZE,
1042 .max_keysize = DES_KEY_SIZE,
1043 .ivsize = DES_BLOCK_SIZE,
1044 .setkey = atmel_des_setkey,
1045 .encrypt = atmel_tdes_cfb32_encrypt,
1046 .decrypt = atmel_tdes_cfb32_decrypt,
1047 }
1048 },
1049 {
1050 .cra_name = "ofb(des)",
1051 .cra_driver_name = "atmel-ofb-des",
1052 .cra_priority = 100,
1053 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1054 .cra_blocksize = DES_BLOCK_SIZE,
1055 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1056 .cra_alignmask = 0x7,
1057 .cra_type = &crypto_ablkcipher_type,
1058 .cra_module = THIS_MODULE,
1059 .cra_init = atmel_tdes_cra_init,
1060 .cra_exit = atmel_tdes_cra_exit,
1061 .cra_u.ablkcipher = {
1062 .min_keysize = DES_KEY_SIZE,
1063 .max_keysize = DES_KEY_SIZE,
1064 .ivsize = DES_BLOCK_SIZE,
1065 .setkey = atmel_des_setkey,
1066 .encrypt = atmel_tdes_ofb_encrypt,
1067 .decrypt = atmel_tdes_ofb_decrypt,
1068 }
1069 },
1070 {
1071 .cra_name = "ecb(des3_ede)",
1072 .cra_driver_name = "atmel-ecb-tdes",
1073 .cra_priority = 100,
1074 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1075 .cra_blocksize = DES_BLOCK_SIZE,
1076 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1077 .cra_alignmask = 0x7,
1078 .cra_type = &crypto_ablkcipher_type,
1079 .cra_module = THIS_MODULE,
1080 .cra_init = atmel_tdes_cra_init,
1081 .cra_exit = atmel_tdes_cra_exit,
1082 .cra_u.ablkcipher = {
1083 .min_keysize = 2 * DES_KEY_SIZE,
1084 .max_keysize = 3 * DES_KEY_SIZE,
1085 .setkey = atmel_tdes_setkey,
1086 .encrypt = atmel_tdes_ecb_encrypt,
1087 .decrypt = atmel_tdes_ecb_decrypt,
1088 }
1089 },
1090 {
1091 .cra_name = "cbc(des3_ede)",
1092 .cra_driver_name = "atmel-cbc-tdes",
1093 .cra_priority = 100,
1094 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1095 .cra_blocksize = DES_BLOCK_SIZE,
1096 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1097 .cra_alignmask = 0x7,
1098 .cra_type = &crypto_ablkcipher_type,
1099 .cra_module = THIS_MODULE,
1100 .cra_init = atmel_tdes_cra_init,
1101 .cra_exit = atmel_tdes_cra_exit,
1102 .cra_u.ablkcipher = {
1103 .min_keysize = 2*DES_KEY_SIZE,
1104 .max_keysize = 3*DES_KEY_SIZE,
1105 .ivsize = DES_BLOCK_SIZE,
1106 .setkey = atmel_tdes_setkey,
1107 .encrypt = atmel_tdes_cbc_encrypt,
1108 .decrypt = atmel_tdes_cbc_decrypt,
1109 }
1110 },
1111 {
1112 .cra_name = "cfb(des3_ede)",
1113 .cra_driver_name = "atmel-cfb-tdes",
1114 .cra_priority = 100,
1115 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1116 .cra_blocksize = DES_BLOCK_SIZE,
1117 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1118 .cra_alignmask = 0x7,
1119 .cra_type = &crypto_ablkcipher_type,
1120 .cra_module = THIS_MODULE,
1121 .cra_init = atmel_tdes_cra_init,
1122 .cra_exit = atmel_tdes_cra_exit,
1123 .cra_u.ablkcipher = {
1124 .min_keysize = 2*DES_KEY_SIZE,
1125 .max_keysize = 2*DES_KEY_SIZE,
1126 .ivsize = DES_BLOCK_SIZE,
1127 .setkey = atmel_tdes_setkey,
1128 .encrypt = atmel_tdes_cfb_encrypt,
1129 .decrypt = atmel_tdes_cfb_decrypt,
1130 }
1131 },
1132 {
1133 .cra_name = "cfb8(des3_ede)",
1134 .cra_driver_name = "atmel-cfb8-tdes",
1135 .cra_priority = 100,
1136 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1137 .cra_blocksize = CFB8_BLOCK_SIZE,
1138 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1139 .cra_alignmask = 0,
1140 .cra_type = &crypto_ablkcipher_type,
1141 .cra_module = THIS_MODULE,
1142 .cra_init = atmel_tdes_cra_init,
1143 .cra_exit = atmel_tdes_cra_exit,
1144 .cra_u.ablkcipher = {
1145 .min_keysize = 2*DES_KEY_SIZE,
1146 .max_keysize = 2*DES_KEY_SIZE,
1147 .ivsize = DES_BLOCK_SIZE,
1148 .setkey = atmel_tdes_setkey,
1149 .encrypt = atmel_tdes_cfb8_encrypt,
1150 .decrypt = atmel_tdes_cfb8_decrypt,
1151 }
1152 },
1153 {
1154 .cra_name = "cfb16(des3_ede)",
1155 .cra_driver_name = "atmel-cfb16-tdes",
1156 .cra_priority = 100,
1157 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1158 .cra_blocksize = CFB16_BLOCK_SIZE,
1159 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1160 .cra_alignmask = 0x1,
1161 .cra_type = &crypto_ablkcipher_type,
1162 .cra_module = THIS_MODULE,
1163 .cra_init = atmel_tdes_cra_init,
1164 .cra_exit = atmel_tdes_cra_exit,
1165 .cra_u.ablkcipher = {
1166 .min_keysize = 2*DES_KEY_SIZE,
1167 .max_keysize = 2*DES_KEY_SIZE,
1168 .ivsize = DES_BLOCK_SIZE,
1169 .setkey = atmel_tdes_setkey,
1170 .encrypt = atmel_tdes_cfb16_encrypt,
1171 .decrypt = atmel_tdes_cfb16_decrypt,
1172 }
1173 },
1174 {
1175 .cra_name = "cfb32(des3_ede)",
1176 .cra_driver_name = "atmel-cfb32-tdes",
1177 .cra_priority = 100,
1178 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1179 .cra_blocksize = CFB32_BLOCK_SIZE,
1180 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1181 .cra_alignmask = 0x3,
1182 .cra_type = &crypto_ablkcipher_type,
1183 .cra_module = THIS_MODULE,
1184 .cra_init = atmel_tdes_cra_init,
1185 .cra_exit = atmel_tdes_cra_exit,
1186 .cra_u.ablkcipher = {
1187 .min_keysize = 2*DES_KEY_SIZE,
1188 .max_keysize = 2*DES_KEY_SIZE,
1189 .ivsize = DES_BLOCK_SIZE,
1190 .setkey = atmel_tdes_setkey,
1191 .encrypt = atmel_tdes_cfb32_encrypt,
1192 .decrypt = atmel_tdes_cfb32_decrypt,
1193 }
1194 },
1195 {
1196 .cra_name = "ofb(des3_ede)",
1197 .cra_driver_name = "atmel-ofb-tdes",
1198 .cra_priority = 100,
1199 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1200 .cra_blocksize = DES_BLOCK_SIZE,
1201 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1202 .cra_alignmask = 0x7,
1203 .cra_type = &crypto_ablkcipher_type,
1204 .cra_module = THIS_MODULE,
1205 .cra_init = atmel_tdes_cra_init,
1206 .cra_exit = atmel_tdes_cra_exit,
1207 .cra_u.ablkcipher = {
1208 .min_keysize = 2*DES_KEY_SIZE,
1209 .max_keysize = 3*DES_KEY_SIZE,
1210 .ivsize = DES_BLOCK_SIZE,
1211 .setkey = atmel_tdes_setkey,
1212 .encrypt = atmel_tdes_ofb_encrypt,
1213 .decrypt = atmel_tdes_ofb_decrypt,
1214 }
1215 },
1216 };
1217
1218 static void atmel_tdes_queue_task(unsigned long data)
1219 {
1220 struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *)data;
1221
1222 atmel_tdes_handle_queue(dd, NULL);
1223 }
1224
1225 static void atmel_tdes_done_task(unsigned long data)
1226 {
1227 struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *) data;
1228 int err;
1229
1230 if (!(dd->flags & TDES_FLAGS_DMA))
1231 err = atmel_tdes_crypt_pdc_stop(dd);
1232 else
1233 err = atmel_tdes_crypt_dma_stop(dd);
1234
1235 err = dd->err ? : err;
1236
1237 if (dd->total && !err) {
1238 if (dd->flags & TDES_FLAGS_FAST) {
1239 dd->in_sg = sg_next(dd->in_sg);
1240 dd->out_sg = sg_next(dd->out_sg);
1241 if (!dd->in_sg || !dd->out_sg)
1242 err = -EINVAL;
1243 }
1244 if (!err)
1245 err = atmel_tdes_crypt_start(dd);
1246 if (!err)
1247 return; /* DMA started. Not fininishing. */
1248 }
1249
1250 atmel_tdes_finish_req(dd, err);
1251 atmel_tdes_handle_queue(dd, NULL);
1252 }
1253
1254 static irqreturn_t atmel_tdes_irq(int irq, void *dev_id)
1255 {
1256 struct atmel_tdes_dev *tdes_dd = dev_id;
1257 u32 reg;
1258
1259 reg = atmel_tdes_read(tdes_dd, TDES_ISR);
1260 if (reg & atmel_tdes_read(tdes_dd, TDES_IMR)) {
1261 atmel_tdes_write(tdes_dd, TDES_IDR, reg);
1262 if (TDES_FLAGS_BUSY & tdes_dd->flags)
1263 tasklet_schedule(&tdes_dd->done_task);
1264 else
1265 dev_warn(tdes_dd->dev, "TDES interrupt when no active requests.\n");
1266 return IRQ_HANDLED;
1267 }
1268
1269 return IRQ_NONE;
1270 }
1271
1272 static void atmel_tdes_unregister_algs(struct atmel_tdes_dev *dd)
1273 {
1274 int i;
1275
1276 for (i = 0; i < ARRAY_SIZE(tdes_algs); i++)
1277 crypto_unregister_alg(&tdes_algs[i]);
1278 }
1279
1280 static int atmel_tdes_register_algs(struct atmel_tdes_dev *dd)
1281 {
1282 int err, i, j;
1283
1284 for (i = 0; i < ARRAY_SIZE(tdes_algs); i++) {
1285 err = crypto_register_alg(&tdes_algs[i]);
1286 if (err)
1287 goto err_tdes_algs;
1288 }
1289
1290 return 0;
1291
1292 err_tdes_algs:
1293 for (j = 0; j < i; j++)
1294 crypto_unregister_alg(&tdes_algs[j]);
1295
1296 return err;
1297 }
1298
1299 static void atmel_tdes_get_cap(struct atmel_tdes_dev *dd)
1300 {
1301
1302 dd->caps.has_dma = 0;
1303 dd->caps.has_cfb_3keys = 0;
1304
1305 /* keep only major version number */
1306 switch (dd->hw_version & 0xf00) {
1307 case 0x700:
1308 dd->caps.has_dma = 1;
1309 dd->caps.has_cfb_3keys = 1;
1310 break;
1311 case 0x600:
1312 break;
1313 default:
1314 dev_warn(dd->dev,
1315 "Unmanaged tdes version, set minimum capabilities\n");
1316 break;
1317 }
1318 }
1319
1320 static int atmel_tdes_probe(struct platform_device *pdev)
1321 {
1322 struct atmel_tdes_dev *tdes_dd;
1323 struct crypto_platform_data *pdata;
1324 struct device *dev = &pdev->dev;
1325 struct resource *tdes_res;
1326 unsigned long tdes_phys_size;
1327 int err;
1328
1329 tdes_dd = kzalloc(sizeof(struct atmel_tdes_dev), GFP_KERNEL);
1330 if (tdes_dd == NULL) {
1331 dev_err(dev, "unable to alloc data struct.\n");
1332 err = -ENOMEM;
1333 goto tdes_dd_err;
1334 }
1335
1336 tdes_dd->dev = dev;
1337
1338 platform_set_drvdata(pdev, tdes_dd);
1339
1340 INIT_LIST_HEAD(&tdes_dd->list);
1341
1342 tasklet_init(&tdes_dd->done_task, atmel_tdes_done_task,
1343 (unsigned long)tdes_dd);
1344 tasklet_init(&tdes_dd->queue_task, atmel_tdes_queue_task,
1345 (unsigned long)tdes_dd);
1346
1347 crypto_init_queue(&tdes_dd->queue, ATMEL_TDES_QUEUE_LENGTH);
1348
1349 tdes_dd->irq = -1;
1350
1351 /* Get the base address */
1352 tdes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1353 if (!tdes_res) {
1354 dev_err(dev, "no MEM resource info\n");
1355 err = -ENODEV;
1356 goto res_err;
1357 }
1358 tdes_dd->phys_base = tdes_res->start;
1359 tdes_phys_size = resource_size(tdes_res);
1360
1361 /* Get the IRQ */
1362 tdes_dd->irq = platform_get_irq(pdev, 0);
1363 if (tdes_dd->irq < 0) {
1364 dev_err(dev, "no IRQ resource info\n");
1365 err = tdes_dd->irq;
1366 goto res_err;
1367 }
1368
1369 err = request_irq(tdes_dd->irq, atmel_tdes_irq, IRQF_SHARED,
1370 "atmel-tdes", tdes_dd);
1371 if (err) {
1372 dev_err(dev, "unable to request tdes irq.\n");
1373 goto tdes_irq_err;
1374 }
1375
1376 /* Initializing the clock */
1377 tdes_dd->iclk = clk_get(&pdev->dev, "tdes_clk");
1378 if (IS_ERR(tdes_dd->iclk)) {
1379 dev_err(dev, "clock intialization failed.\n");
1380 err = PTR_ERR(tdes_dd->iclk);
1381 goto clk_err;
1382 }
1383
1384 tdes_dd->io_base = ioremap(tdes_dd->phys_base, tdes_phys_size);
1385 if (!tdes_dd->io_base) {
1386 dev_err(dev, "can't ioremap\n");
1387 err = -ENOMEM;
1388 goto tdes_io_err;
1389 }
1390
1391 atmel_tdes_hw_version_init(tdes_dd);
1392
1393 atmel_tdes_get_cap(tdes_dd);
1394
1395 err = atmel_tdes_buff_init(tdes_dd);
1396 if (err)
1397 goto err_tdes_buff;
1398
1399 if (tdes_dd->caps.has_dma) {
1400 pdata = pdev->dev.platform_data;
1401 if (!pdata) {
1402 dev_err(&pdev->dev, "platform data not available\n");
1403 err = -ENXIO;
1404 goto err_pdata;
1405 }
1406 err = atmel_tdes_dma_init(tdes_dd, pdata);
1407 if (err)
1408 goto err_tdes_dma;
1409 }
1410
1411 spin_lock(&atmel_tdes.lock);
1412 list_add_tail(&tdes_dd->list, &atmel_tdes.dev_list);
1413 spin_unlock(&atmel_tdes.lock);
1414
1415 err = atmel_tdes_register_algs(tdes_dd);
1416 if (err)
1417 goto err_algs;
1418
1419 dev_info(dev, "Atmel DES/TDES\n");
1420
1421 return 0;
1422
1423 err_algs:
1424 spin_lock(&atmel_tdes.lock);
1425 list_del(&tdes_dd->list);
1426 spin_unlock(&atmel_tdes.lock);
1427 if (tdes_dd->caps.has_dma)
1428 atmel_tdes_dma_cleanup(tdes_dd);
1429 err_tdes_dma:
1430 err_pdata:
1431 atmel_tdes_buff_cleanup(tdes_dd);
1432 err_tdes_buff:
1433 iounmap(tdes_dd->io_base);
1434 tdes_io_err:
1435 clk_put(tdes_dd->iclk);
1436 clk_err:
1437 free_irq(tdes_dd->irq, tdes_dd);
1438 tdes_irq_err:
1439 res_err:
1440 tasklet_kill(&tdes_dd->done_task);
1441 tasklet_kill(&tdes_dd->queue_task);
1442 kfree(tdes_dd);
1443 tdes_dd = NULL;
1444 tdes_dd_err:
1445 dev_err(dev, "initialization failed.\n");
1446
1447 return err;
1448 }
1449
1450 static int atmel_tdes_remove(struct platform_device *pdev)
1451 {
1452 static struct atmel_tdes_dev *tdes_dd;
1453
1454 tdes_dd = platform_get_drvdata(pdev);
1455 if (!tdes_dd)
1456 return -ENODEV;
1457 spin_lock(&atmel_tdes.lock);
1458 list_del(&tdes_dd->list);
1459 spin_unlock(&atmel_tdes.lock);
1460
1461 atmel_tdes_unregister_algs(tdes_dd);
1462
1463 tasklet_kill(&tdes_dd->done_task);
1464 tasklet_kill(&tdes_dd->queue_task);
1465
1466 if (tdes_dd->caps.has_dma)
1467 atmel_tdes_dma_cleanup(tdes_dd);
1468
1469 atmel_tdes_buff_cleanup(tdes_dd);
1470
1471 iounmap(tdes_dd->io_base);
1472
1473 clk_put(tdes_dd->iclk);
1474
1475 if (tdes_dd->irq >= 0)
1476 free_irq(tdes_dd->irq, tdes_dd);
1477
1478 kfree(tdes_dd);
1479 tdes_dd = NULL;
1480
1481 return 0;
1482 }
1483
1484 static struct platform_driver atmel_tdes_driver = {
1485 .probe = atmel_tdes_probe,
1486 .remove = atmel_tdes_remove,
1487 .driver = {
1488 .name = "atmel_tdes",
1489 .owner = THIS_MODULE,
1490 },
1491 };
1492
1493 module_platform_driver(atmel_tdes_driver);
1494
1495 MODULE_DESCRIPTION("Atmel DES/TDES hw acceleration support.");
1496 MODULE_LICENSE("GPL v2");
1497 MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
Linux with added FPC-III support