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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / crypto / atmel-tdes.c
blob592124f8382b6575d5200cbbd24a7d8e9c7a2eca
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/of_device.h>
34 #include <linux/delay.h>
35 #include <linux/crypto.h>
36 #include <linux/cryptohash.h>
37 #include <crypto/scatterwalk.h>
38 #include <crypto/algapi.h>
39 #include <crypto/des.h>
40 #include <crypto/hash.h>
41 #include <crypto/internal/hash.h>
42 #include <linux/platform_data/crypto-atmel.h>
43 #include "atmel-tdes-regs.h"
44
45 /* TDES flags */
46 #define TDES_FLAGS_MODE_MASK 0x00ff
47 #define TDES_FLAGS_ENCRYPT BIT(0)
48 #define TDES_FLAGS_CBC BIT(1)
49 #define TDES_FLAGS_CFB BIT(2)
50 #define TDES_FLAGS_CFB8 BIT(3)
51 #define TDES_FLAGS_CFB16 BIT(4)
52 #define TDES_FLAGS_CFB32 BIT(5)
53 #define TDES_FLAGS_CFB64 BIT(6)
54 #define TDES_FLAGS_OFB BIT(7)
55
56 #define TDES_FLAGS_INIT BIT(16)
57 #define TDES_FLAGS_FAST BIT(17)
58 #define TDES_FLAGS_BUSY BIT(18)
59 #define TDES_FLAGS_DMA BIT(19)
60
61 #define ATMEL_TDES_QUEUE_LENGTH 50
62
63 #define CFB8_BLOCK_SIZE 1
64 #define CFB16_BLOCK_SIZE 2
65 #define CFB32_BLOCK_SIZE 4
66
67 struct atmel_tdes_caps {
68 bool has_dma;
69 u32 has_cfb_3keys;
70 };
71
72 struct atmel_tdes_dev;
73
74 struct atmel_tdes_ctx {
75 struct atmel_tdes_dev *dd;
76
77 int keylen;
78 u32 key[3*DES_KEY_SIZE / sizeof(u32)];
79 unsigned long flags;
80
81 u16 block_size;
82 };
83
84 struct atmel_tdes_reqctx {
85 unsigned long mode;
86 };
87
88 struct atmel_tdes_dma {
89 struct dma_chan *chan;
90 struct dma_slave_config dma_conf;
91 };
92
93 struct atmel_tdes_dev {
94 struct list_head list;
95 unsigned long phys_base;
96 void __iomem *io_base;
97
98 struct atmel_tdes_ctx *ctx;
99 struct device *dev;
100 struct clk *iclk;
101 int irq;
102
103 unsigned long flags;
104 int err;
105
106 spinlock_t lock;
107 struct crypto_queue queue;
108
109 struct tasklet_struct done_task;
110 struct tasklet_struct queue_task;
111
112 struct ablkcipher_request *req;
113 size_t total;
114
115 struct scatterlist *in_sg;
116 unsigned int nb_in_sg;
117 size_t in_offset;
118 struct scatterlist *out_sg;
119 unsigned int nb_out_sg;
120 size_t out_offset;
121
122 size_t buflen;
123 size_t dma_size;
124
125 void *buf_in;
126 int dma_in;
127 dma_addr_t dma_addr_in;
128 struct atmel_tdes_dma dma_lch_in;
129
130 void *buf_out;
131 int dma_out;
132 dma_addr_t dma_addr_out;
133 struct atmel_tdes_dma dma_lch_out;
134
135 struct atmel_tdes_caps caps;
136
137 u32 hw_version;
138 };
139
140 struct atmel_tdes_drv {
141 struct list_head dev_list;
142 spinlock_t lock;
143 };
144
145 static struct atmel_tdes_drv atmel_tdes = {
146 .dev_list = LIST_HEAD_INIT(atmel_tdes.dev_list),
147 .lock = __SPIN_LOCK_UNLOCKED(atmel_tdes.lock),
148 };
149
150 static int atmel_tdes_sg_copy(struct scatterlist **sg, size_t *offset,
151 void *buf, size_t buflen, size_t total, int out)
152 {
153 size_t count, off = 0;
154
155 while (buflen && total) {
156 count = min((*sg)->length - *offset, total);
157 count = min(count, buflen);
158
159 if (!count)
160 return off;
161
162 scatterwalk_map_and_copy(buf + off, *sg, *offset, count, out);
163
164 off += count;
165 buflen -= count;
166 *offset += count;
167 total -= count;
168
169 if (*offset == (*sg)->length) {
170 *sg = sg_next(*sg);
171 if (*sg)
172 *offset = 0;
173 else
174 total = 0;
175 }
176 }
177
178 return off;
179 }
180
181 static inline u32 atmel_tdes_read(struct atmel_tdes_dev *dd, u32 offset)
182 {
183 return readl_relaxed(dd->io_base + offset);
184 }
185
186 static inline void atmel_tdes_write(struct atmel_tdes_dev *dd,
187 u32 offset, u32 value)
188 {
189 writel_relaxed(value, dd->io_base + offset);
190 }
191
192 static void atmel_tdes_write_n(struct atmel_tdes_dev *dd, u32 offset,
193 u32 *value, int count)
194 {
195 for (; count--; value++, offset += 4)
196 atmel_tdes_write(dd, offset, *value);
197 }
198
199 static struct atmel_tdes_dev *atmel_tdes_find_dev(struct atmel_tdes_ctx *ctx)
200 {
201 struct atmel_tdes_dev *tdes_dd = NULL;
202 struct atmel_tdes_dev *tmp;
203
204 spin_lock_bh(&atmel_tdes.lock);
205 if (!ctx->dd) {
206 list_for_each_entry(tmp, &atmel_tdes.dev_list, list) {
207 tdes_dd = tmp;
208 break;
209 }
210 ctx->dd = tdes_dd;
211 } else {
212 tdes_dd = ctx->dd;
213 }
214 spin_unlock_bh(&atmel_tdes.lock);
215
216 return tdes_dd;
217 }
218
219 static int atmel_tdes_hw_init(struct atmel_tdes_dev *dd)
220 {
221 int err;
222
223 err = clk_prepare_enable(dd->iclk);
224 if (err)
225 return err;
226
227 if (!(dd->flags & TDES_FLAGS_INIT)) {
228 atmel_tdes_write(dd, TDES_CR, TDES_CR_SWRST);
229 dd->flags |= TDES_FLAGS_INIT;
230 dd->err = 0;
231 }
232
233 return 0;
234 }
235
236 static inline unsigned int atmel_tdes_get_version(struct atmel_tdes_dev *dd)
237 {
238 return atmel_tdes_read(dd, TDES_HW_VERSION) & 0x00000fff;
239 }
240
241 static void atmel_tdes_hw_version_init(struct atmel_tdes_dev *dd)
242 {
243 atmel_tdes_hw_init(dd);
244
245 dd->hw_version = atmel_tdes_get_version(dd);
246
247 dev_info(dd->dev,
248 "version: 0x%x\n", dd->hw_version);
249
250 clk_disable_unprepare(dd->iclk);
251 }
252
253 static void atmel_tdes_dma_callback(void *data)
254 {
255 struct atmel_tdes_dev *dd = data;
256
257 /* dma_lch_out - completed */
258 tasklet_schedule(&dd->done_task);
259 }
260
261 static int atmel_tdes_write_ctrl(struct atmel_tdes_dev *dd)
262 {
263 int err;
264 u32 valcr = 0, valmr = TDES_MR_SMOD_PDC;
265
266 err = atmel_tdes_hw_init(dd);
267
268 if (err)
269 return err;
270
271 if (!dd->caps.has_dma)
272 atmel_tdes_write(dd, TDES_PTCR,
273 TDES_PTCR_TXTDIS | TDES_PTCR_RXTDIS);
274
275 /* MR register must be set before IV registers */
276 if (dd->ctx->keylen > (DES_KEY_SIZE << 1)) {
277 valmr |= TDES_MR_KEYMOD_3KEY;
278 valmr |= TDES_MR_TDESMOD_TDES;
279 } else if (dd->ctx->keylen > DES_KEY_SIZE) {
280 valmr |= TDES_MR_KEYMOD_2KEY;
281 valmr |= TDES_MR_TDESMOD_TDES;
282 } else {
283 valmr |= TDES_MR_TDESMOD_DES;
284 }
285
286 if (dd->flags & TDES_FLAGS_CBC) {
287 valmr |= TDES_MR_OPMOD_CBC;
288 } else if (dd->flags & TDES_FLAGS_CFB) {
289 valmr |= TDES_MR_OPMOD_CFB;
290
291 if (dd->flags & TDES_FLAGS_CFB8)
292 valmr |= TDES_MR_CFBS_8b;
293 else if (dd->flags & TDES_FLAGS_CFB16)
294 valmr |= TDES_MR_CFBS_16b;
295 else if (dd->flags & TDES_FLAGS_CFB32)
296 valmr |= TDES_MR_CFBS_32b;
297 else if (dd->flags & TDES_FLAGS_CFB64)
298 valmr |= TDES_MR_CFBS_64b;
299 } else if (dd->flags & TDES_FLAGS_OFB) {
300 valmr |= TDES_MR_OPMOD_OFB;
301 }
302
303 if ((dd->flags & TDES_FLAGS_ENCRYPT) || (dd->flags & TDES_FLAGS_OFB))
304 valmr |= TDES_MR_CYPHER_ENC;
305
306 atmel_tdes_write(dd, TDES_CR, valcr);
307 atmel_tdes_write(dd, TDES_MR, valmr);
308
309 atmel_tdes_write_n(dd, TDES_KEY1W1R, dd->ctx->key,
310 dd->ctx->keylen >> 2);
311
312 if (((dd->flags & TDES_FLAGS_CBC) || (dd->flags & TDES_FLAGS_CFB) ||
313 (dd->flags & TDES_FLAGS_OFB)) && dd->req->info) {
314 atmel_tdes_write_n(dd, TDES_IV1R, dd->req->info, 2);
315 }
316
317 return 0;
318 }
319
320 static int atmel_tdes_crypt_pdc_stop(struct atmel_tdes_dev *dd)
321 {
322 int err = 0;
323 size_t count;
324
325 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
326
327 if (dd->flags & TDES_FLAGS_FAST) {
328 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
329 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
330 } else {
331 dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
332 dd->dma_size, DMA_FROM_DEVICE);
333
334 /* copy data */
335 count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset,
336 dd->buf_out, dd->buflen, dd->dma_size, 1);
337 if (count != dd->dma_size) {
338 err = -EINVAL;
339 pr_err("not all data converted: %zu\n", count);
340 }
341 }
342
343 return err;
344 }
345
346 static int atmel_tdes_buff_init(struct atmel_tdes_dev *dd)
347 {
348 int err = -ENOMEM;
349
350 dd->buf_in = (void *)__get_free_pages(GFP_KERNEL, 0);
351 dd->buf_out = (void *)__get_free_pages(GFP_KERNEL, 0);
352 dd->buflen = PAGE_SIZE;
353 dd->buflen &= ~(DES_BLOCK_SIZE - 1);
354
355 if (!dd->buf_in || !dd->buf_out) {
356 dev_err(dd->dev, "unable to alloc pages.\n");
357 goto err_alloc;
358 }
359
360 /* MAP here */
361 dd->dma_addr_in = dma_map_single(dd->dev, dd->buf_in,
362 dd->buflen, DMA_TO_DEVICE);
363 if (dma_mapping_error(dd->dev, dd->dma_addr_in)) {
364 dev_err(dd->dev, "dma %zd bytes error\n", dd->buflen);
365 err = -EINVAL;
366 goto err_map_in;
367 }
368
369 dd->dma_addr_out = dma_map_single(dd->dev, dd->buf_out,
370 dd->buflen, DMA_FROM_DEVICE);
371 if (dma_mapping_error(dd->dev, dd->dma_addr_out)) {
372 dev_err(dd->dev, "dma %zd bytes error\n", dd->buflen);
373 err = -EINVAL;
374 goto err_map_out;
375 }
376
377 return 0;
378
379 err_map_out:
380 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
381 DMA_TO_DEVICE);
382 err_map_in:
383 err_alloc:
384 free_page((unsigned long)dd->buf_out);
385 free_page((unsigned long)dd->buf_in);
386 if (err)
387 pr_err("error: %d\n", err);
388 return err;
389 }
390
391 static void atmel_tdes_buff_cleanup(struct atmel_tdes_dev *dd)
392 {
393 dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen,
394 DMA_FROM_DEVICE);
395 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
396 DMA_TO_DEVICE);
397 free_page((unsigned long)dd->buf_out);
398 free_page((unsigned long)dd->buf_in);
399 }
400
401 static int atmel_tdes_crypt_pdc(struct crypto_tfm *tfm, dma_addr_t dma_addr_in,
402 dma_addr_t dma_addr_out, int length)
403 {
404 struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm);
405 struct atmel_tdes_dev *dd = ctx->dd;
406 int len32;
407
408 dd->dma_size = length;
409
410 if (!(dd->flags & TDES_FLAGS_FAST)) {
411 dma_sync_single_for_device(dd->dev, dma_addr_in, length,
412 DMA_TO_DEVICE);
413 }
414
415 if ((dd->flags & TDES_FLAGS_CFB) && (dd->flags & TDES_FLAGS_CFB8))
416 len32 = DIV_ROUND_UP(length, sizeof(u8));
417 else if ((dd->flags & TDES_FLAGS_CFB) && (dd->flags & TDES_FLAGS_CFB16))
418 len32 = DIV_ROUND_UP(length, sizeof(u16));
419 else
420 len32 = DIV_ROUND_UP(length, sizeof(u32));
421
422 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
423 atmel_tdes_write(dd, TDES_TPR, dma_addr_in);
424 atmel_tdes_write(dd, TDES_TCR, len32);
425 atmel_tdes_write(dd, TDES_RPR, dma_addr_out);
426 atmel_tdes_write(dd, TDES_RCR, len32);
427
428 /* Enable Interrupt */
429 atmel_tdes_write(dd, TDES_IER, TDES_INT_ENDRX);
430
431 /* Start DMA transfer */
432 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTEN | TDES_PTCR_RXTEN);
433
434 return 0;
435 }
436
437 static int atmel_tdes_crypt_dma(struct crypto_tfm *tfm, dma_addr_t dma_addr_in,
438 dma_addr_t dma_addr_out, int length)
439 {
440 struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm);
441 struct atmel_tdes_dev *dd = ctx->dd;
442 struct scatterlist sg[2];
443 struct dma_async_tx_descriptor *in_desc, *out_desc;
444
445 dd->dma_size = length;
446
447 if (!(dd->flags & TDES_FLAGS_FAST)) {
448 dma_sync_single_for_device(dd->dev, dma_addr_in, length,
449 DMA_TO_DEVICE);
450 }
451
452 if (dd->flags & TDES_FLAGS_CFB8) {
453 dd->dma_lch_in.dma_conf.dst_addr_width =
454 DMA_SLAVE_BUSWIDTH_1_BYTE;
455 dd->dma_lch_out.dma_conf.src_addr_width =
456 DMA_SLAVE_BUSWIDTH_1_BYTE;
457 } else if (dd->flags & TDES_FLAGS_CFB16) {
458 dd->dma_lch_in.dma_conf.dst_addr_width =
459 DMA_SLAVE_BUSWIDTH_2_BYTES;
460 dd->dma_lch_out.dma_conf.src_addr_width =
461 DMA_SLAVE_BUSWIDTH_2_BYTES;
462 } else {
463 dd->dma_lch_in.dma_conf.dst_addr_width =
464 DMA_SLAVE_BUSWIDTH_4_BYTES;
465 dd->dma_lch_out.dma_conf.src_addr_width =
466 DMA_SLAVE_BUSWIDTH_4_BYTES;
467 }
468
469 dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf);
470 dmaengine_slave_config(dd->dma_lch_out.chan, &dd->dma_lch_out.dma_conf);
471
472 dd->flags |= TDES_FLAGS_DMA;
473
474 sg_init_table(&sg[0], 1);
475 sg_dma_address(&sg[0]) = dma_addr_in;
476 sg_dma_len(&sg[0]) = length;
477
478 sg_init_table(&sg[1], 1);
479 sg_dma_address(&sg[1]) = dma_addr_out;
480 sg_dma_len(&sg[1]) = length;
481
482 in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, &sg[0],
483 1, DMA_MEM_TO_DEV,
484 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
485 if (!in_desc)
486 return -EINVAL;
487
488 out_desc = dmaengine_prep_slave_sg(dd->dma_lch_out.chan, &sg[1],
489 1, DMA_DEV_TO_MEM,
490 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
491 if (!out_desc)
492 return -EINVAL;
493
494 out_desc->callback = atmel_tdes_dma_callback;
495 out_desc->callback_param = dd;
496
497 dmaengine_submit(out_desc);
498 dma_async_issue_pending(dd->dma_lch_out.chan);
499
500 dmaengine_submit(in_desc);
501 dma_async_issue_pending(dd->dma_lch_in.chan);
502
503 return 0;
504 }
505
506 static int atmel_tdes_crypt_start(struct atmel_tdes_dev *dd)
507 {
508 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(
509 crypto_ablkcipher_reqtfm(dd->req));
510 int err, fast = 0, in, out;
511 size_t count;
512 dma_addr_t addr_in, addr_out;
513
514 if ((!dd->in_offset) && (!dd->out_offset)) {
515 /* check for alignment */
516 in = IS_ALIGNED((u32)dd->in_sg->offset, sizeof(u32)) &&
517 IS_ALIGNED(dd->in_sg->length, dd->ctx->block_size);
518 out = IS_ALIGNED((u32)dd->out_sg->offset, sizeof(u32)) &&
519 IS_ALIGNED(dd->out_sg->length, dd->ctx->block_size);
520 fast = in && out;
521
522 if (sg_dma_len(dd->in_sg) != sg_dma_len(dd->out_sg))
523 fast = 0;
524 }
525
526
527 if (fast) {
528 count = min_t(size_t, dd->total, sg_dma_len(dd->in_sg));
529 count = min_t(size_t, count, sg_dma_len(dd->out_sg));
530
531 err = dma_map_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
532 if (!err) {
533 dev_err(dd->dev, "dma_map_sg() error\n");
534 return -EINVAL;
535 }
536
537 err = dma_map_sg(dd->dev, dd->out_sg, 1,
538 DMA_FROM_DEVICE);
539 if (!err) {
540 dev_err(dd->dev, "dma_map_sg() error\n");
541 dma_unmap_sg(dd->dev, dd->in_sg, 1,
542 DMA_TO_DEVICE);
543 return -EINVAL;
544 }
545
546 addr_in = sg_dma_address(dd->in_sg);
547 addr_out = sg_dma_address(dd->out_sg);
548
549 dd->flags |= TDES_FLAGS_FAST;
550
551 } else {
552 /* use cache buffers */
553 count = atmel_tdes_sg_copy(&dd->in_sg, &dd->in_offset,
554 dd->buf_in, dd->buflen, dd->total, 0);
555
556 addr_in = dd->dma_addr_in;
557 addr_out = dd->dma_addr_out;
558
559 dd->flags &= ~TDES_FLAGS_FAST;
560 }
561
562 dd->total -= count;
563
564 if (dd->caps.has_dma)
565 err = atmel_tdes_crypt_dma(tfm, addr_in, addr_out, count);
566 else
567 err = atmel_tdes_crypt_pdc(tfm, addr_in, addr_out, count);
568
569 if (err && (dd->flags & TDES_FLAGS_FAST)) {
570 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
571 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_TO_DEVICE);
572 }
573
574 return err;
575 }
576
577 static void atmel_tdes_finish_req(struct atmel_tdes_dev *dd, int err)
578 {
579 struct ablkcipher_request *req = dd->req;
580
581 clk_disable_unprepare(dd->iclk);
582
583 dd->flags &= ~TDES_FLAGS_BUSY;
584
585 req->base.complete(&req->base, err);
586 }
587
588 static int atmel_tdes_handle_queue(struct atmel_tdes_dev *dd,
589 struct ablkcipher_request *req)
590 {
591 struct crypto_async_request *async_req, *backlog;
592 struct atmel_tdes_ctx *ctx;
593 struct atmel_tdes_reqctx *rctx;
594 unsigned long flags;
595 int err, ret = 0;
596
597 spin_lock_irqsave(&dd->lock, flags);
598 if (req)
599 ret = ablkcipher_enqueue_request(&dd->queue, req);
600 if (dd->flags & TDES_FLAGS_BUSY) {
601 spin_unlock_irqrestore(&dd->lock, flags);
602 return ret;
603 }
604 backlog = crypto_get_backlog(&dd->queue);
605 async_req = crypto_dequeue_request(&dd->queue);
606 if (async_req)
607 dd->flags |= TDES_FLAGS_BUSY;
608 spin_unlock_irqrestore(&dd->lock, flags);
609
610 if (!async_req)
611 return ret;
612
613 if (backlog)
614 backlog->complete(backlog, -EINPROGRESS);
615
616 req = ablkcipher_request_cast(async_req);
617
618 /* assign new request to device */
619 dd->req = req;
620 dd->total = req->nbytes;
621 dd->in_offset = 0;
622 dd->in_sg = req->src;
623 dd->out_offset = 0;
624 dd->out_sg = req->dst;
625
626 rctx = ablkcipher_request_ctx(req);
627 ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
628 rctx->mode &= TDES_FLAGS_MODE_MASK;
629 dd->flags = (dd->flags & ~TDES_FLAGS_MODE_MASK) | rctx->mode;
630 dd->ctx = ctx;
631 ctx->dd = dd;
632
633 err = atmel_tdes_write_ctrl(dd);
634 if (!err)
635 err = atmel_tdes_crypt_start(dd);
636 if (err) {
637 /* des_task will not finish it, so do it here */
638 atmel_tdes_finish_req(dd, err);
639 tasklet_schedule(&dd->queue_task);
640 }
641
642 return ret;
643 }
644
645 static int atmel_tdes_crypt_dma_stop(struct atmel_tdes_dev *dd)
646 {
647 int err = -EINVAL;
648 size_t count;
649
650 if (dd->flags & TDES_FLAGS_DMA) {
651 err = 0;
652 if (dd->flags & TDES_FLAGS_FAST) {
653 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
654 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
655 } else {
656 dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
657 dd->dma_size, DMA_FROM_DEVICE);
658
659 /* copy data */
660 count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset,
661 dd->buf_out, dd->buflen, dd->dma_size, 1);
662 if (count != dd->dma_size) {
663 err = -EINVAL;
664 pr_err("not all data converted: %zu\n", count);
665 }
666 }
667 }
668 return err;
669 }
670
671 static int atmel_tdes_crypt(struct ablkcipher_request *req, unsigned long mode)
672 {
673 struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(
674 crypto_ablkcipher_reqtfm(req));
675 struct atmel_tdes_reqctx *rctx = ablkcipher_request_ctx(req);
676
677 if (mode & TDES_FLAGS_CFB8) {
678 if (!IS_ALIGNED(req->nbytes, CFB8_BLOCK_SIZE)) {
679 pr_err("request size is not exact amount of CFB8 blocks\n");
680 return -EINVAL;
681 }
682 ctx->block_size = CFB8_BLOCK_SIZE;
683 } else if (mode & TDES_FLAGS_CFB16) {
684 if (!IS_ALIGNED(req->nbytes, CFB16_BLOCK_SIZE)) {
685 pr_err("request size is not exact amount of CFB16 blocks\n");
686 return -EINVAL;
687 }
688 ctx->block_size = CFB16_BLOCK_SIZE;
689 } else if (mode & TDES_FLAGS_CFB32) {
690 if (!IS_ALIGNED(req->nbytes, CFB32_BLOCK_SIZE)) {
691 pr_err("request size is not exact amount of CFB32 blocks\n");
692 return -EINVAL;
693 }
694 ctx->block_size = CFB32_BLOCK_SIZE;
695 } else {
696 if (!IS_ALIGNED(req->nbytes, DES_BLOCK_SIZE)) {
697 pr_err("request size is not exact amount of DES blocks\n");
698 return -EINVAL;
699 }
700 ctx->block_size = DES_BLOCK_SIZE;
701 }
702
703 rctx->mode = mode;
704
705 return atmel_tdes_handle_queue(ctx->dd, req);
706 }
707
708 static bool atmel_tdes_filter(struct dma_chan *chan, void *slave)
709 {
710 struct at_dma_slave *sl = slave;
711
712 if (sl && sl->dma_dev == chan->device->dev) {
713 chan->private = sl;
714 return true;
715 } else {
716 return false;
717 }
718 }
719
720 static int atmel_tdes_dma_init(struct atmel_tdes_dev *dd,
721 struct crypto_platform_data *pdata)
722 {
723 dma_cap_mask_t mask;
724
725 dma_cap_zero(mask);
726 dma_cap_set(DMA_SLAVE, mask);
727
728 /* Try to grab 2 DMA channels */
729 dd->dma_lch_in.chan = dma_request_slave_channel_compat(mask,
730 atmel_tdes_filter, &pdata->dma_slave->rxdata, dd->dev, "tx");
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 dd->dma_lch_out.chan = dma_request_slave_channel_compat(mask,
746 atmel_tdes_filter, &pdata->dma_slave->txdata, dd->dev, "rx");
747 if (!dd->dma_lch_out.chan)
748 goto err_dma_out;
749
750 dd->dma_lch_out.dma_conf.direction = DMA_DEV_TO_MEM;
751 dd->dma_lch_out.dma_conf.src_addr = dd->phys_base +
752 TDES_ODATA1R;
753 dd->dma_lch_out.dma_conf.src_maxburst = 1;
754 dd->dma_lch_out.dma_conf.src_addr_width =
755 DMA_SLAVE_BUSWIDTH_4_BYTES;
756 dd->dma_lch_out.dma_conf.dst_maxburst = 1;
757 dd->dma_lch_out.dma_conf.dst_addr_width =
758 DMA_SLAVE_BUSWIDTH_4_BYTES;
759 dd->dma_lch_out.dma_conf.device_fc = false;
760
761 return 0;
762
763 err_dma_out:
764 dma_release_channel(dd->dma_lch_in.chan);
765 err_dma_in:
766 dev_warn(dd->dev, "no DMA channel available\n");
767 return -ENODEV;
768 }
769
770 static void atmel_tdes_dma_cleanup(struct atmel_tdes_dev *dd)
771 {
772 dma_release_channel(dd->dma_lch_in.chan);
773 dma_release_channel(dd->dma_lch_out.chan);
774 }
775
776 static int atmel_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
777 unsigned int keylen)
778 {
779 u32 tmp[DES_EXPKEY_WORDS];
780 int err;
781 struct crypto_tfm *ctfm = crypto_ablkcipher_tfm(tfm);
782
783 struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
784
785 if (keylen != DES_KEY_SIZE) {
786 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
787 return -EINVAL;
788 }
789
790 err = des_ekey(tmp, key);
791 if (err == 0 && (ctfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
792 ctfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
793 return -EINVAL;
794 }
795
796 memcpy(ctx->key, key, keylen);
797 ctx->keylen = keylen;
798
799 return 0;
800 }
801
802 static int atmel_tdes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
803 unsigned int keylen)
804 {
805 struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
806 const char *alg_name;
807
808 alg_name = crypto_tfm_alg_name(crypto_ablkcipher_tfm(tfm));
809
810 /*
811 * HW bug in cfb 3-keys mode.
812 */
813 if (!ctx->dd->caps.has_cfb_3keys && strstr(alg_name, "cfb")
814 && (keylen != 2*DES_KEY_SIZE)) {
815 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
816 return -EINVAL;
817 } else if ((keylen != 2*DES_KEY_SIZE) && (keylen != 3*DES_KEY_SIZE)) {
818 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
819 return -EINVAL;
820 }
821
822 memcpy(ctx->key, key, keylen);
823 ctx->keylen = keylen;
824
825 return 0;
826 }
827
828 static int atmel_tdes_ecb_encrypt(struct ablkcipher_request *req)
829 {
830 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT);
831 }
832
833 static int atmel_tdes_ecb_decrypt(struct ablkcipher_request *req)
834 {
835 return atmel_tdes_crypt(req, 0);
836 }
837
838 static int atmel_tdes_cbc_encrypt(struct ablkcipher_request *req)
839 {
840 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CBC);
841 }
842
843 static int atmel_tdes_cbc_decrypt(struct ablkcipher_request *req)
844 {
845 return atmel_tdes_crypt(req, TDES_FLAGS_CBC);
846 }
847 static int atmel_tdes_cfb_encrypt(struct ablkcipher_request *req)
848 {
849 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB);
850 }
851
852 static int atmel_tdes_cfb_decrypt(struct ablkcipher_request *req)
853 {
854 return atmel_tdes_crypt(req, TDES_FLAGS_CFB);
855 }
856
857 static int atmel_tdes_cfb8_encrypt(struct ablkcipher_request *req)
858 {
859 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB |
860 TDES_FLAGS_CFB8);
861 }
862
863 static int atmel_tdes_cfb8_decrypt(struct ablkcipher_request *req)
864 {
865 return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB8);
866 }
867
868 static int atmel_tdes_cfb16_encrypt(struct ablkcipher_request *req)
869 {
870 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB |
871 TDES_FLAGS_CFB16);
872 }
873
874 static int atmel_tdes_cfb16_decrypt(struct ablkcipher_request *req)
875 {
876 return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB16);
877 }
878
879 static int atmel_tdes_cfb32_encrypt(struct ablkcipher_request *req)
880 {
881 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB |
882 TDES_FLAGS_CFB32);
883 }
884
885 static int atmel_tdes_cfb32_decrypt(struct ablkcipher_request *req)
886 {
887 return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB32);
888 }
889
890 static int atmel_tdes_ofb_encrypt(struct ablkcipher_request *req)
891 {
892 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_OFB);
893 }
894
895 static int atmel_tdes_ofb_decrypt(struct ablkcipher_request *req)
896 {
897 return atmel_tdes_crypt(req, TDES_FLAGS_OFB);
898 }
899
900 static int atmel_tdes_cra_init(struct crypto_tfm *tfm)
901 {
902 struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm);
903 struct atmel_tdes_dev *dd;
904
905 tfm->crt_ablkcipher.reqsize = sizeof(struct atmel_tdes_reqctx);
906
907 dd = atmel_tdes_find_dev(ctx);
908 if (!dd)
909 return -ENODEV;
910
911 return 0;
912 }
913
914 static struct crypto_alg tdes_algs[] = {
915 {
916 .cra_name = "ecb(des)",
917 .cra_driver_name = "atmel-ecb-des",
918 .cra_priority = 100,
919 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
920 .cra_blocksize = DES_BLOCK_SIZE,
921 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
922 .cra_alignmask = 0x7,
923 .cra_type = &crypto_ablkcipher_type,
924 .cra_module = THIS_MODULE,
925 .cra_init = atmel_tdes_cra_init,
926 .cra_u.ablkcipher = {
927 .min_keysize = DES_KEY_SIZE,
928 .max_keysize = DES_KEY_SIZE,
929 .setkey = atmel_des_setkey,
930 .encrypt = atmel_tdes_ecb_encrypt,
931 .decrypt = atmel_tdes_ecb_decrypt,
932 }
933 },
934 {
935 .cra_name = "cbc(des)",
936 .cra_driver_name = "atmel-cbc-des",
937 .cra_priority = 100,
938 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
939 .cra_blocksize = DES_BLOCK_SIZE,
940 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
941 .cra_alignmask = 0x7,
942 .cra_type = &crypto_ablkcipher_type,
943 .cra_module = THIS_MODULE,
944 .cra_init = atmel_tdes_cra_init,
945 .cra_u.ablkcipher = {
946 .min_keysize = DES_KEY_SIZE,
947 .max_keysize = DES_KEY_SIZE,
948 .ivsize = DES_BLOCK_SIZE,
949 .setkey = atmel_des_setkey,
950 .encrypt = atmel_tdes_cbc_encrypt,
951 .decrypt = atmel_tdes_cbc_decrypt,
952 }
953 },
954 {
955 .cra_name = "cfb(des)",
956 .cra_driver_name = "atmel-cfb-des",
957 .cra_priority = 100,
958 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
959 .cra_blocksize = DES_BLOCK_SIZE,
960 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
961 .cra_alignmask = 0x7,
962 .cra_type = &crypto_ablkcipher_type,
963 .cra_module = THIS_MODULE,
964 .cra_init = atmel_tdes_cra_init,
965 .cra_u.ablkcipher = {
966 .min_keysize = DES_KEY_SIZE,
967 .max_keysize = DES_KEY_SIZE,
968 .ivsize = DES_BLOCK_SIZE,
969 .setkey = atmel_des_setkey,
970 .encrypt = atmel_tdes_cfb_encrypt,
971 .decrypt = atmel_tdes_cfb_decrypt,
972 }
973 },
974 {
975 .cra_name = "cfb8(des)",
976 .cra_driver_name = "atmel-cfb8-des",
977 .cra_priority = 100,
978 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
979 .cra_blocksize = CFB8_BLOCK_SIZE,
980 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
981 .cra_alignmask = 0,
982 .cra_type = &crypto_ablkcipher_type,
983 .cra_module = THIS_MODULE,
984 .cra_init = atmel_tdes_cra_init,
985 .cra_u.ablkcipher = {
986 .min_keysize = DES_KEY_SIZE,
987 .max_keysize = DES_KEY_SIZE,
988 .ivsize = DES_BLOCK_SIZE,
989 .setkey = atmel_des_setkey,
990 .encrypt = atmel_tdes_cfb8_encrypt,
991 .decrypt = atmel_tdes_cfb8_decrypt,
992 }
993 },
994 {
995 .cra_name = "cfb16(des)",
996 .cra_driver_name = "atmel-cfb16-des",
997 .cra_priority = 100,
998 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
999 .cra_blocksize = CFB16_BLOCK_SIZE,
1000 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1001 .cra_alignmask = 0x1,
1002 .cra_type = &crypto_ablkcipher_type,
1003 .cra_module = THIS_MODULE,
1004 .cra_init = atmel_tdes_cra_init,
1005 .cra_u.ablkcipher = {
1006 .min_keysize = DES_KEY_SIZE,
1007 .max_keysize = DES_KEY_SIZE,
1008 .ivsize = DES_BLOCK_SIZE,
1009 .setkey = atmel_des_setkey,
1010 .encrypt = atmel_tdes_cfb16_encrypt,
1011 .decrypt = atmel_tdes_cfb16_decrypt,
1012 }
1013 },
1014 {
1015 .cra_name = "cfb32(des)",
1016 .cra_driver_name = "atmel-cfb32-des",
1017 .cra_priority = 100,
1018 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1019 .cra_blocksize = CFB32_BLOCK_SIZE,
1020 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1021 .cra_alignmask = 0x3,
1022 .cra_type = &crypto_ablkcipher_type,
1023 .cra_module = THIS_MODULE,
1024 .cra_init = atmel_tdes_cra_init,
1025 .cra_u.ablkcipher = {
1026 .min_keysize = DES_KEY_SIZE,
1027 .max_keysize = DES_KEY_SIZE,
1028 .ivsize = DES_BLOCK_SIZE,
1029 .setkey = atmel_des_setkey,
1030 .encrypt = atmel_tdes_cfb32_encrypt,
1031 .decrypt = atmel_tdes_cfb32_decrypt,
1032 }
1033 },
1034 {
1035 .cra_name = "ofb(des)",
1036 .cra_driver_name = "atmel-ofb-des",
1037 .cra_priority = 100,
1038 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1039 .cra_blocksize = DES_BLOCK_SIZE,
1040 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1041 .cra_alignmask = 0x7,
1042 .cra_type = &crypto_ablkcipher_type,
1043 .cra_module = THIS_MODULE,
1044 .cra_init = atmel_tdes_cra_init,
1045 .cra_u.ablkcipher = {
1046 .min_keysize = DES_KEY_SIZE,
1047 .max_keysize = DES_KEY_SIZE,
1048 .ivsize = DES_BLOCK_SIZE,
1049 .setkey = atmel_des_setkey,
1050 .encrypt = atmel_tdes_ofb_encrypt,
1051 .decrypt = atmel_tdes_ofb_decrypt,
1052 }
1053 },
1054 {
1055 .cra_name = "ecb(des3_ede)",
1056 .cra_driver_name = "atmel-ecb-tdes",
1057 .cra_priority = 100,
1058 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1059 .cra_blocksize = DES_BLOCK_SIZE,
1060 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1061 .cra_alignmask = 0x7,
1062 .cra_type = &crypto_ablkcipher_type,
1063 .cra_module = THIS_MODULE,
1064 .cra_init = atmel_tdes_cra_init,
1065 .cra_u.ablkcipher = {
1066 .min_keysize = 2 * DES_KEY_SIZE,
1067 .max_keysize = 3 * DES_KEY_SIZE,
1068 .setkey = atmel_tdes_setkey,
1069 .encrypt = atmel_tdes_ecb_encrypt,
1070 .decrypt = atmel_tdes_ecb_decrypt,
1071 }
1072 },
1073 {
1074 .cra_name = "cbc(des3_ede)",
1075 .cra_driver_name = "atmel-cbc-tdes",
1076 .cra_priority = 100,
1077 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1078 .cra_blocksize = DES_BLOCK_SIZE,
1079 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1080 .cra_alignmask = 0x7,
1081 .cra_type = &crypto_ablkcipher_type,
1082 .cra_module = THIS_MODULE,
1083 .cra_init = atmel_tdes_cra_init,
1084 .cra_u.ablkcipher = {
1085 .min_keysize = 2*DES_KEY_SIZE,
1086 .max_keysize = 3*DES_KEY_SIZE,
1087 .ivsize = DES_BLOCK_SIZE,
1088 .setkey = atmel_tdes_setkey,
1089 .encrypt = atmel_tdes_cbc_encrypt,
1090 .decrypt = atmel_tdes_cbc_decrypt,
1091 }
1092 },
1093 {
1094 .cra_name = "cfb(des3_ede)",
1095 .cra_driver_name = "atmel-cfb-tdes",
1096 .cra_priority = 100,
1097 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1098 .cra_blocksize = DES_BLOCK_SIZE,
1099 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1100 .cra_alignmask = 0x7,
1101 .cra_type = &crypto_ablkcipher_type,
1102 .cra_module = THIS_MODULE,
1103 .cra_init = atmel_tdes_cra_init,
1104 .cra_u.ablkcipher = {
1105 .min_keysize = 2*DES_KEY_SIZE,
1106 .max_keysize = 2*DES_KEY_SIZE,
1107 .ivsize = DES_BLOCK_SIZE,
1108 .setkey = atmel_tdes_setkey,
1109 .encrypt = atmel_tdes_cfb_encrypt,
1110 .decrypt = atmel_tdes_cfb_decrypt,
1111 }
1112 },
1113 {
1114 .cra_name = "cfb8(des3_ede)",
1115 .cra_driver_name = "atmel-cfb8-tdes",
1116 .cra_priority = 100,
1117 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1118 .cra_blocksize = CFB8_BLOCK_SIZE,
1119 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1120 .cra_alignmask = 0,
1121 .cra_type = &crypto_ablkcipher_type,
1122 .cra_module = THIS_MODULE,
1123 .cra_init = atmel_tdes_cra_init,
1124 .cra_u.ablkcipher = {
1125 .min_keysize = 2*DES_KEY_SIZE,
1126 .max_keysize = 2*DES_KEY_SIZE,
1127 .ivsize = DES_BLOCK_SIZE,
1128 .setkey = atmel_tdes_setkey,
1129 .encrypt = atmel_tdes_cfb8_encrypt,
1130 .decrypt = atmel_tdes_cfb8_decrypt,
1131 }
1132 },
1133 {
1134 .cra_name = "cfb16(des3_ede)",
1135 .cra_driver_name = "atmel-cfb16-tdes",
1136 .cra_priority = 100,
1137 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1138 .cra_blocksize = CFB16_BLOCK_SIZE,
1139 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1140 .cra_alignmask = 0x1,
1141 .cra_type = &crypto_ablkcipher_type,
1142 .cra_module = THIS_MODULE,
1143 .cra_init = atmel_tdes_cra_init,
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_cfb16_encrypt,
1150 .decrypt = atmel_tdes_cfb16_decrypt,
1151 }
1152 },
1153 {
1154 .cra_name = "cfb32(des3_ede)",
1155 .cra_driver_name = "atmel-cfb32-tdes",
1156 .cra_priority = 100,
1157 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1158 .cra_blocksize = CFB32_BLOCK_SIZE,
1159 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1160 .cra_alignmask = 0x3,
1161 .cra_type = &crypto_ablkcipher_type,
1162 .cra_module = THIS_MODULE,
1163 .cra_init = atmel_tdes_cra_init,
1164 .cra_u.ablkcipher = {
1165 .min_keysize = 2*DES_KEY_SIZE,
1166 .max_keysize = 2*DES_KEY_SIZE,
1167 .ivsize = DES_BLOCK_SIZE,
1168 .setkey = atmel_tdes_setkey,
1169 .encrypt = atmel_tdes_cfb32_encrypt,
1170 .decrypt = atmel_tdes_cfb32_decrypt,
1171 }
1172 },
1173 {
1174 .cra_name = "ofb(des3_ede)",
1175 .cra_driver_name = "atmel-ofb-tdes",
1176 .cra_priority = 100,
1177 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1178 .cra_blocksize = DES_BLOCK_SIZE,
1179 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1180 .cra_alignmask = 0x7,
1181 .cra_type = &crypto_ablkcipher_type,
1182 .cra_module = THIS_MODULE,
1183 .cra_init = atmel_tdes_cra_init,
1184 .cra_u.ablkcipher = {
1185 .min_keysize = 2*DES_KEY_SIZE,
1186 .max_keysize = 3*DES_KEY_SIZE,
1187 .ivsize = DES_BLOCK_SIZE,
1188 .setkey = atmel_tdes_setkey,
1189 .encrypt = atmel_tdes_ofb_encrypt,
1190 .decrypt = atmel_tdes_ofb_decrypt,
1191 }
1192 },
1193 };
1194
1195 static void atmel_tdes_queue_task(unsigned long data)
1196 {
1197 struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *)data;
1198
1199 atmel_tdes_handle_queue(dd, NULL);
1200 }
1201
1202 static void atmel_tdes_done_task(unsigned long data)
1203 {
1204 struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *) data;
1205 int err;
1206
1207 if (!(dd->flags & TDES_FLAGS_DMA))
1208 err = atmel_tdes_crypt_pdc_stop(dd);
1209 else
1210 err = atmel_tdes_crypt_dma_stop(dd);
1211
1212 err = dd->err ? : err;
1213
1214 if (dd->total && !err) {
1215 if (dd->flags & TDES_FLAGS_FAST) {
1216 dd->in_sg = sg_next(dd->in_sg);
1217 dd->out_sg = sg_next(dd->out_sg);
1218 if (!dd->in_sg || !dd->out_sg)
1219 err = -EINVAL;
1220 }
1221 if (!err)
1222 err = atmel_tdes_crypt_start(dd);
1223 if (!err)
1224 return; /* DMA started. Not fininishing. */
1225 }
1226
1227 atmel_tdes_finish_req(dd, err);
1228 atmel_tdes_handle_queue(dd, NULL);
1229 }
1230
1231 static irqreturn_t atmel_tdes_irq(int irq, void *dev_id)
1232 {
1233 struct atmel_tdes_dev *tdes_dd = dev_id;
1234 u32 reg;
1235
1236 reg = atmel_tdes_read(tdes_dd, TDES_ISR);
1237 if (reg & atmel_tdes_read(tdes_dd, TDES_IMR)) {
1238 atmel_tdes_write(tdes_dd, TDES_IDR, reg);
1239 if (TDES_FLAGS_BUSY & tdes_dd->flags)
1240 tasklet_schedule(&tdes_dd->done_task);
1241 else
1242 dev_warn(tdes_dd->dev, "TDES interrupt when no active requests.\n");
1243 return IRQ_HANDLED;
1244 }
1245
1246 return IRQ_NONE;
1247 }
1248
1249 static void atmel_tdes_unregister_algs(struct atmel_tdes_dev *dd)
1250 {
1251 int i;
1252
1253 for (i = 0; i < ARRAY_SIZE(tdes_algs); i++)
1254 crypto_unregister_alg(&tdes_algs[i]);
1255 }
1256
1257 static int atmel_tdes_register_algs(struct atmel_tdes_dev *dd)
1258 {
1259 int err, i, j;
1260
1261 for (i = 0; i < ARRAY_SIZE(tdes_algs); i++) {
1262 err = crypto_register_alg(&tdes_algs[i]);
1263 if (err)
1264 goto err_tdes_algs;
1265 }
1266
1267 return 0;
1268
1269 err_tdes_algs:
1270 for (j = 0; j < i; j++)
1271 crypto_unregister_alg(&tdes_algs[j]);
1272
1273 return err;
1274 }
1275
1276 static void atmel_tdes_get_cap(struct atmel_tdes_dev *dd)
1277 {
1278
1279 dd->caps.has_dma = 0;
1280 dd->caps.has_cfb_3keys = 0;
1281
1282 /* keep only major version number */
1283 switch (dd->hw_version & 0xf00) {
1284 case 0x700:
1285 dd->caps.has_dma = 1;
1286 dd->caps.has_cfb_3keys = 1;
1287 break;
1288 case 0x600:
1289 break;
1290 default:
1291 dev_warn(dd->dev,
1292 "Unmanaged tdes version, set minimum capabilities\n");
1293 break;
1294 }
1295 }
1296
1297 #if defined(CONFIG_OF)
1298 static const struct of_device_id atmel_tdes_dt_ids[] = {
1299 { .compatible = "atmel,at91sam9g46-tdes" },
1300 { /* sentinel */ }
1301 };
1302 MODULE_DEVICE_TABLE(of, atmel_tdes_dt_ids);
1303
1304 static struct crypto_platform_data *atmel_tdes_of_init(struct platform_device *pdev)
1305 {
1306 struct device_node *np = pdev->dev.of_node;
1307 struct crypto_platform_data *pdata;
1308
1309 if (!np) {
1310 dev_err(&pdev->dev, "device node not found\n");
1311 return ERR_PTR(-EINVAL);
1312 }
1313
1314 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
1315 if (!pdata) {
1316 dev_err(&pdev->dev, "could not allocate memory for pdata\n");
1317 return ERR_PTR(-ENOMEM);
1318 }
1319
1320 pdata->dma_slave = devm_kzalloc(&pdev->dev,
1321 sizeof(*(pdata->dma_slave)),
1322 GFP_KERNEL);
1323 if (!pdata->dma_slave) {
1324 dev_err(&pdev->dev, "could not allocate memory for dma_slave\n");
1325 return ERR_PTR(-ENOMEM);
1326 }
1327
1328 return pdata;
1329 }
1330 #else /* CONFIG_OF */
1331 static inline struct crypto_platform_data *atmel_tdes_of_init(struct platform_device *pdev)
1332 {
1333 return ERR_PTR(-EINVAL);
1334 }
1335 #endif
1336
1337 static int atmel_tdes_probe(struct platform_device *pdev)
1338 {
1339 struct atmel_tdes_dev *tdes_dd;
1340 struct crypto_platform_data *pdata;
1341 struct device *dev = &pdev->dev;
1342 struct resource *tdes_res;
1343 int err;
1344
1345 tdes_dd = devm_kmalloc(&pdev->dev, sizeof(*tdes_dd), GFP_KERNEL);
1346 if (tdes_dd == NULL) {
1347 dev_err(dev, "unable to alloc data struct.\n");
1348 err = -ENOMEM;
1349 goto tdes_dd_err;
1350 }
1351
1352 tdes_dd->dev = dev;
1353
1354 platform_set_drvdata(pdev, tdes_dd);
1355
1356 INIT_LIST_HEAD(&tdes_dd->list);
1357 spin_lock_init(&tdes_dd->lock);
1358
1359 tasklet_init(&tdes_dd->done_task, atmel_tdes_done_task,
1360 (unsigned long)tdes_dd);
1361 tasklet_init(&tdes_dd->queue_task, atmel_tdes_queue_task,
1362 (unsigned long)tdes_dd);
1363
1364 crypto_init_queue(&tdes_dd->queue, ATMEL_TDES_QUEUE_LENGTH);
1365
1366 /* Get the base address */
1367 tdes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1368 if (!tdes_res) {
1369 dev_err(dev, "no MEM resource info\n");
1370 err = -ENODEV;
1371 goto res_err;
1372 }
1373 tdes_dd->phys_base = tdes_res->start;
1374
1375 /* Get the IRQ */
1376 tdes_dd->irq = platform_get_irq(pdev, 0);
1377 if (tdes_dd->irq < 0) {
1378 dev_err(dev, "no IRQ resource info\n");
1379 err = tdes_dd->irq;
1380 goto res_err;
1381 }
1382
1383 err = devm_request_irq(&pdev->dev, tdes_dd->irq, atmel_tdes_irq,
1384 IRQF_SHARED, "atmel-tdes", tdes_dd);
1385 if (err) {
1386 dev_err(dev, "unable to request tdes irq.\n");
1387 goto res_err;
1388 }
1389
1390 /* Initializing the clock */
1391 tdes_dd->iclk = devm_clk_get(&pdev->dev, "tdes_clk");
1392 if (IS_ERR(tdes_dd->iclk)) {
1393 dev_err(dev, "clock initialization failed.\n");
1394 err = PTR_ERR(tdes_dd->iclk);
1395 goto res_err;
1396 }
1397
1398 tdes_dd->io_base = devm_ioremap_resource(&pdev->dev, tdes_res);
1399 if (IS_ERR(tdes_dd->io_base)) {
1400 dev_err(dev, "can't ioremap\n");
1401 err = PTR_ERR(tdes_dd->io_base);
1402 goto res_err;
1403 }
1404
1405 atmel_tdes_hw_version_init(tdes_dd);
1406
1407 atmel_tdes_get_cap(tdes_dd);
1408
1409 err = atmel_tdes_buff_init(tdes_dd);
1410 if (err)
1411 goto err_tdes_buff;
1412
1413 if (tdes_dd->caps.has_dma) {
1414 pdata = pdev->dev.platform_data;
1415 if (!pdata) {
1416 pdata = atmel_tdes_of_init(pdev);
1417 if (IS_ERR(pdata)) {
1418 dev_err(&pdev->dev, "platform data not available\n");
1419 err = PTR_ERR(pdata);
1420 goto err_pdata;
1421 }
1422 }
1423 if (!pdata->dma_slave) {
1424 err = -ENXIO;
1425 goto err_pdata;
1426 }
1427 err = atmel_tdes_dma_init(tdes_dd, pdata);
1428 if (err)
1429 goto err_tdes_dma;
1430
1431 dev_info(dev, "using %s, %s for DMA transfers\n",
1432 dma_chan_name(tdes_dd->dma_lch_in.chan),
1433 dma_chan_name(tdes_dd->dma_lch_out.chan));
1434 }
1435
1436 spin_lock(&atmel_tdes.lock);
1437 list_add_tail(&tdes_dd->list, &atmel_tdes.dev_list);
1438 spin_unlock(&atmel_tdes.lock);
1439
1440 err = atmel_tdes_register_algs(tdes_dd);
1441 if (err)
1442 goto err_algs;
1443
1444 dev_info(dev, "Atmel DES/TDES\n");
1445
1446 return 0;
1447
1448 err_algs:
1449 spin_lock(&atmel_tdes.lock);
1450 list_del(&tdes_dd->list);
1451 spin_unlock(&atmel_tdes.lock);
1452 if (tdes_dd->caps.has_dma)
1453 atmel_tdes_dma_cleanup(tdes_dd);
1454 err_tdes_dma:
1455 err_pdata:
1456 atmel_tdes_buff_cleanup(tdes_dd);
1457 err_tdes_buff:
1458 res_err:
1459 tasklet_kill(&tdes_dd->done_task);
1460 tasklet_kill(&tdes_dd->queue_task);
1461 tdes_dd_err:
1462 dev_err(dev, "initialization failed.\n");
1463
1464 return err;
1465 }
1466
1467 static int atmel_tdes_remove(struct platform_device *pdev)
1468 {
1469 struct atmel_tdes_dev *tdes_dd;
1470
1471 tdes_dd = platform_get_drvdata(pdev);
1472 if (!tdes_dd)
1473 return -ENODEV;
1474 spin_lock(&atmel_tdes.lock);
1475 list_del(&tdes_dd->list);
1476 spin_unlock(&atmel_tdes.lock);
1477
1478 atmel_tdes_unregister_algs(tdes_dd);
1479
1480 tasklet_kill(&tdes_dd->done_task);
1481 tasklet_kill(&tdes_dd->queue_task);
1482
1483 if (tdes_dd->caps.has_dma)
1484 atmel_tdes_dma_cleanup(tdes_dd);
1485
1486 atmel_tdes_buff_cleanup(tdes_dd);
1487
1488 return 0;
1489 }
1490
1491 static struct platform_driver atmel_tdes_driver = {
1492 .probe = atmel_tdes_probe,
1493 .remove = atmel_tdes_remove,
1494 .driver = {
1495 .name = "atmel_tdes",
1496 .of_match_table = of_match_ptr(atmel_tdes_dt_ids),
1497 },
1498 };
1499
1500 module_platform_driver(atmel_tdes_driver);
1501
1502 MODULE_DESCRIPTION("Atmel DES/TDES hw acceleration support.");
1503 MODULE_LICENSE("GPL v2");
1504 MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
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