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14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/err.h>
18#include <linux/clk.h>
19#include <linux/io.h>
20#include <linux/hw_random.h>
21#include <linux/platform_device.h>
22
23#include <linux/device.h>
24#include <linux/dmaengine.h>
25#include <linux/init.h>
26#include <linux/errno.h>
27#include <linux/interrupt.h>
28#include <linux/irq.h>
29#include <linux/scatterlist.h>
30#include <linux/dma-mapping.h>
31#include <linux/of_device.h>
32#include <linux/delay.h>
33#include <linux/crypto.h>
34#include <crypto/scatterwalk.h>
35#include <crypto/algapi.h>
36#include <crypto/internal/des.h>
37#include <crypto/internal/skcipher.h>
38#include "atmel-tdes-regs.h"
39
40#define ATMEL_TDES_PRIORITY 300
41
42
43
44#define TDES_FLAGS_ENCRYPT TDES_MR_CYPHER_ENC
45#define TDES_FLAGS_OPMODE_MASK (TDES_MR_OPMOD_MASK | TDES_MR_CFBS_MASK)
46#define TDES_FLAGS_ECB TDES_MR_OPMOD_ECB
47#define TDES_FLAGS_CBC TDES_MR_OPMOD_CBC
48#define TDES_FLAGS_OFB TDES_MR_OPMOD_OFB
49#define TDES_FLAGS_CFB64 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_64b)
50#define TDES_FLAGS_CFB32 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_32b)
51#define TDES_FLAGS_CFB16 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_16b)
52#define TDES_FLAGS_CFB8 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_8b)
53
54#define TDES_FLAGS_MODE_MASK (TDES_FLAGS_OPMODE_MASK | TDES_FLAGS_ENCRYPT)
55
56#define TDES_FLAGS_INIT BIT(3)
57#define TDES_FLAGS_FAST BIT(4)
58#define TDES_FLAGS_BUSY BIT(5)
59#define TDES_FLAGS_DMA BIT(6)
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
67struct atmel_tdes_caps {
68 bool has_dma;
69 u32 has_cfb_3keys;
70};
71
72struct atmel_tdes_dev;
73
74struct atmel_tdes_ctx {
75 struct atmel_tdes_dev *dd;
76
77 int keylen;
78 u32 key[DES3_EDE_KEY_SIZE / sizeof(u32)];
79 unsigned long flags;
80
81 u16 block_size;
82};
83
84struct atmel_tdes_reqctx {
85 unsigned long mode;
86 u8 lastc[DES_BLOCK_SIZE];
87};
88
89struct atmel_tdes_dma {
90 struct dma_chan *chan;
91 struct dma_slave_config dma_conf;
92};
93
94struct atmel_tdes_dev {
95 struct list_head list;
96 unsigned long phys_base;
97 void __iomem *io_base;
98
99 struct atmel_tdes_ctx *ctx;
100 struct device *dev;
101 struct clk *iclk;
102 int irq;
103
104 unsigned long flags;
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 skcipher_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
140struct atmel_tdes_drv {
141 struct list_head dev_list;
142 spinlock_t lock;
143};
144
145static 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
150static 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
181static inline u32 atmel_tdes_read(struct atmel_tdes_dev *dd, u32 offset)
182{
183 return readl_relaxed(dd->io_base + offset);
184}
185
186static 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
192static void atmel_tdes_write_n(struct atmel_tdes_dev *dd, u32 offset,
193 const u32 *value, int count)
194{
195 for (; count--; value++, offset += 4)
196 atmel_tdes_write(dd, offset, *value);
197}
198
199static 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
219static 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 }
231
232 return 0;
233}
234
235static inline unsigned int atmel_tdes_get_version(struct atmel_tdes_dev *dd)
236{
237 return atmel_tdes_read(dd, TDES_HW_VERSION) & 0x00000fff;
238}
239
240static int atmel_tdes_hw_version_init(struct atmel_tdes_dev *dd)
241{
242 int err;
243
244 err = atmel_tdes_hw_init(dd);
245 if (err)
246 return err;
247
248 dd->hw_version = atmel_tdes_get_version(dd);
249
250 dev_info(dd->dev,
251 "version: 0x%x\n", dd->hw_version);
252
253 clk_disable_unprepare(dd->iclk);
254
255 return 0;
256}
257
258static void atmel_tdes_dma_callback(void *data)
259{
260 struct atmel_tdes_dev *dd = data;
261
262
263 tasklet_schedule(&dd->done_task);
264}
265
266static int atmel_tdes_write_ctrl(struct atmel_tdes_dev *dd)
267{
268 int err;
269 u32 valmr = TDES_MR_SMOD_PDC;
270
271 err = atmel_tdes_hw_init(dd);
272
273 if (err)
274 return err;
275
276 if (!dd->caps.has_dma)
277 atmel_tdes_write(dd, TDES_PTCR,
278 TDES_PTCR_TXTDIS | TDES_PTCR_RXTDIS);
279
280
281 if (dd->ctx->keylen > (DES_KEY_SIZE << 1)) {
282 valmr |= TDES_MR_KEYMOD_3KEY;
283 valmr |= TDES_MR_TDESMOD_TDES;
284 } else if (dd->ctx->keylen > DES_KEY_SIZE) {
285 valmr |= TDES_MR_KEYMOD_2KEY;
286 valmr |= TDES_MR_TDESMOD_TDES;
287 } else {
288 valmr |= TDES_MR_TDESMOD_DES;
289 }
290
291 valmr |= dd->flags & TDES_FLAGS_MODE_MASK;
292
293 atmel_tdes_write(dd, TDES_MR, valmr);
294
295 atmel_tdes_write_n(dd, TDES_KEY1W1R, dd->ctx->key,
296 dd->ctx->keylen >> 2);
297
298 if (dd->req->iv && (valmr & TDES_MR_OPMOD_MASK) != TDES_MR_OPMOD_ECB)
299 atmel_tdes_write_n(dd, TDES_IV1R, (void *)dd->req->iv, 2);
300
301 return 0;
302}
303
304static int atmel_tdes_crypt_pdc_stop(struct atmel_tdes_dev *dd)
305{
306 int err = 0;
307 size_t count;
308
309 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
310
311 if (dd->flags & TDES_FLAGS_FAST) {
312 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
313 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
314 } else {
315 dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
316 dd->dma_size, DMA_FROM_DEVICE);
317
318
319 count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset,
320 dd->buf_out, dd->buflen, dd->dma_size, 1);
321 if (count != dd->dma_size) {
322 err = -EINVAL;
323 pr_err("not all data converted: %zu\n", count);
324 }
325 }
326
327 return err;
328}
329
330static int atmel_tdes_buff_init(struct atmel_tdes_dev *dd)
331{
332 int err = -ENOMEM;
333
334 dd->buf_in = (void *)__get_free_pages(GFP_KERNEL, 0);
335 dd->buf_out = (void *)__get_free_pages(GFP_KERNEL, 0);
336 dd->buflen = PAGE_SIZE;
337 dd->buflen &= ~(DES_BLOCK_SIZE - 1);
338
339 if (!dd->buf_in || !dd->buf_out) {
340 dev_err(dd->dev, "unable to alloc pages.\n");
341 goto err_alloc;
342 }
343
344
345 dd->dma_addr_in = dma_map_single(dd->dev, dd->buf_in,
346 dd->buflen, DMA_TO_DEVICE);
347 if (dma_mapping_error(dd->dev, dd->dma_addr_in)) {
348 dev_err(dd->dev, "dma %zd bytes error\n", dd->buflen);
349 err = -EINVAL;
350 goto err_map_in;
351 }
352
353 dd->dma_addr_out = dma_map_single(dd->dev, dd->buf_out,
354 dd->buflen, DMA_FROM_DEVICE);
355 if (dma_mapping_error(dd->dev, dd->dma_addr_out)) {
356 dev_err(dd->dev, "dma %zd bytes error\n", dd->buflen);
357 err = -EINVAL;
358 goto err_map_out;
359 }
360
361 return 0;
362
363err_map_out:
364 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
365 DMA_TO_DEVICE);
366err_map_in:
367err_alloc:
368 free_page((unsigned long)dd->buf_out);
369 free_page((unsigned long)dd->buf_in);
370 if (err)
371 pr_err("error: %d\n", err);
372 return err;
373}
374
375static void atmel_tdes_buff_cleanup(struct atmel_tdes_dev *dd)
376{
377 dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen,
378 DMA_FROM_DEVICE);
379 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
380 DMA_TO_DEVICE);
381 free_page((unsigned long)dd->buf_out);
382 free_page((unsigned long)dd->buf_in);
383}
384
385static int atmel_tdes_crypt_pdc(struct atmel_tdes_dev *dd,
386 dma_addr_t dma_addr_in,
387 dma_addr_t dma_addr_out, int length)
388{
389 struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(dd->req);
390 int len32;
391
392 dd->dma_size = length;
393
394 if (!(dd->flags & TDES_FLAGS_FAST)) {
395 dma_sync_single_for_device(dd->dev, dma_addr_in, length,
396 DMA_TO_DEVICE);
397 }
398
399 switch (rctx->mode & TDES_FLAGS_OPMODE_MASK) {
400 case TDES_FLAGS_CFB8:
401 len32 = DIV_ROUND_UP(length, sizeof(u8));
402 break;
403
404 case TDES_FLAGS_CFB16:
405 len32 = DIV_ROUND_UP(length, sizeof(u16));
406 break;
407
408 default:
409 len32 = DIV_ROUND_UP(length, sizeof(u32));
410 break;
411 }
412
413 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
414 atmel_tdes_write(dd, TDES_TPR, dma_addr_in);
415 atmel_tdes_write(dd, TDES_TCR, len32);
416 atmel_tdes_write(dd, TDES_RPR, dma_addr_out);
417 atmel_tdes_write(dd, TDES_RCR, len32);
418
419
420 atmel_tdes_write(dd, TDES_IER, TDES_INT_ENDRX);
421
422
423 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTEN | TDES_PTCR_RXTEN);
424
425 return 0;
426}
427
428static int atmel_tdes_crypt_dma(struct atmel_tdes_dev *dd,
429 dma_addr_t dma_addr_in,
430 dma_addr_t dma_addr_out, int length)
431{
432 struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(dd->req);
433 struct scatterlist sg[2];
434 struct dma_async_tx_descriptor *in_desc, *out_desc;
435 enum dma_slave_buswidth addr_width;
436
437 dd->dma_size = length;
438
439 if (!(dd->flags & TDES_FLAGS_FAST)) {
440 dma_sync_single_for_device(dd->dev, dma_addr_in, length,
441 DMA_TO_DEVICE);
442 }
443
444 switch (rctx->mode & TDES_FLAGS_OPMODE_MASK) {
445 case TDES_FLAGS_CFB8:
446 addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
447 break;
448
449 case TDES_FLAGS_CFB16:
450 addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
451 break;
452
453 default:
454 addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
455 break;
456 }
457
458 dd->dma_lch_in.dma_conf.dst_addr_width = addr_width;
459 dd->dma_lch_out.dma_conf.src_addr_width = addr_width;
460
461 dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf);
462 dmaengine_slave_config(dd->dma_lch_out.chan, &dd->dma_lch_out.dma_conf);
463
464 dd->flags |= TDES_FLAGS_DMA;
465
466 sg_init_table(&sg[0], 1);
467 sg_dma_address(&sg[0]) = dma_addr_in;
468 sg_dma_len(&sg[0]) = length;
469
470 sg_init_table(&sg[1], 1);
471 sg_dma_address(&sg[1]) = dma_addr_out;
472 sg_dma_len(&sg[1]) = length;
473
474 in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, &sg[0],
475 1, DMA_MEM_TO_DEV,
476 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
477 if (!in_desc)
478 return -EINVAL;
479
480 out_desc = dmaengine_prep_slave_sg(dd->dma_lch_out.chan, &sg[1],
481 1, DMA_DEV_TO_MEM,
482 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
483 if (!out_desc)
484 return -EINVAL;
485
486 out_desc->callback = atmel_tdes_dma_callback;
487 out_desc->callback_param = dd;
488
489 dmaengine_submit(out_desc);
490 dma_async_issue_pending(dd->dma_lch_out.chan);
491
492 dmaengine_submit(in_desc);
493 dma_async_issue_pending(dd->dma_lch_in.chan);
494
495 return 0;
496}
497
498static int atmel_tdes_crypt_start(struct atmel_tdes_dev *dd)
499{
500 int err, fast = 0, in, out;
501 size_t count;
502 dma_addr_t addr_in, addr_out;
503
504 if ((!dd->in_offset) && (!dd->out_offset)) {
505
506 in = IS_ALIGNED((u32)dd->in_sg->offset, sizeof(u32)) &&
507 IS_ALIGNED(dd->in_sg->length, dd->ctx->block_size);
508 out = IS_ALIGNED((u32)dd->out_sg->offset, sizeof(u32)) &&
509 IS_ALIGNED(dd->out_sg->length, dd->ctx->block_size);
510 fast = in && out;
511
512 if (sg_dma_len(dd->in_sg) != sg_dma_len(dd->out_sg))
513 fast = 0;
514 }
515
516
517 if (fast) {
518 count = min_t(size_t, dd->total, sg_dma_len(dd->in_sg));
519 count = min_t(size_t, count, sg_dma_len(dd->out_sg));
520
521 err = dma_map_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
522 if (!err) {
523 dev_err(dd->dev, "dma_map_sg() error\n");
524 return -EINVAL;
525 }
526
527 err = dma_map_sg(dd->dev, dd->out_sg, 1,
528 DMA_FROM_DEVICE);
529 if (!err) {
530 dev_err(dd->dev, "dma_map_sg() error\n");
531 dma_unmap_sg(dd->dev, dd->in_sg, 1,
532 DMA_TO_DEVICE);
533 return -EINVAL;
534 }
535
536 addr_in = sg_dma_address(dd->in_sg);
537 addr_out = sg_dma_address(dd->out_sg);
538
539 dd->flags |= TDES_FLAGS_FAST;
540
541 } else {
542
543 count = atmel_tdes_sg_copy(&dd->in_sg, &dd->in_offset,
544 dd->buf_in, dd->buflen, dd->total, 0);
545
546 addr_in = dd->dma_addr_in;
547 addr_out = dd->dma_addr_out;
548
549 dd->flags &= ~TDES_FLAGS_FAST;
550 }
551
552 dd->total -= count;
553
554 if (dd->caps.has_dma)
555 err = atmel_tdes_crypt_dma(dd, addr_in, addr_out, count);
556 else
557 err = atmel_tdes_crypt_pdc(dd, addr_in, addr_out, count);
558
559 if (err && (dd->flags & TDES_FLAGS_FAST)) {
560 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
561 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_TO_DEVICE);
562 }
563
564 return err;
565}
566
567static void
568atmel_tdes_set_iv_as_last_ciphertext_block(struct atmel_tdes_dev *dd)
569{
570 struct skcipher_request *req = dd->req;
571 struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(req);
572 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
573 unsigned int ivsize = crypto_skcipher_ivsize(skcipher);
574
575 if (req->cryptlen < ivsize)
576 return;
577
578 if (rctx->mode & TDES_FLAGS_ENCRYPT) {
579 scatterwalk_map_and_copy(req->iv, req->dst,
580 req->cryptlen - ivsize, ivsize, 0);
581 } else {
582 if (req->src == req->dst)
583 memcpy(req->iv, rctx->lastc, ivsize);
584 else
585 scatterwalk_map_and_copy(req->iv, req->src,
586 req->cryptlen - ivsize,
587 ivsize, 0);
588 }
589}
590
591static void atmel_tdes_finish_req(struct atmel_tdes_dev *dd, int err)
592{
593 struct skcipher_request *req = dd->req;
594 struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(req);
595
596 clk_disable_unprepare(dd->iclk);
597
598 dd->flags &= ~TDES_FLAGS_BUSY;
599
600 if (!err && (rctx->mode & TDES_FLAGS_OPMODE_MASK) != TDES_FLAGS_ECB)
601 atmel_tdes_set_iv_as_last_ciphertext_block(dd);
602
603 req->base.complete(&req->base, err);
604}
605
606static int atmel_tdes_handle_queue(struct atmel_tdes_dev *dd,
607 struct skcipher_request *req)
608{
609 struct crypto_async_request *async_req, *backlog;
610 struct atmel_tdes_ctx *ctx;
611 struct atmel_tdes_reqctx *rctx;
612 unsigned long flags;
613 int err, ret = 0;
614
615 spin_lock_irqsave(&dd->lock, flags);
616 if (req)
617 ret = crypto_enqueue_request(&dd->queue, &req->base);
618 if (dd->flags & TDES_FLAGS_BUSY) {
619 spin_unlock_irqrestore(&dd->lock, flags);
620 return ret;
621 }
622 backlog = crypto_get_backlog(&dd->queue);
623 async_req = crypto_dequeue_request(&dd->queue);
624 if (async_req)
625 dd->flags |= TDES_FLAGS_BUSY;
626 spin_unlock_irqrestore(&dd->lock, flags);
627
628 if (!async_req)
629 return ret;
630
631 if (backlog)
632 backlog->complete(backlog, -EINPROGRESS);
633
634 req = skcipher_request_cast(async_req);
635
636
637 dd->req = req;
638 dd->total = req->cryptlen;
639 dd->in_offset = 0;
640 dd->in_sg = req->src;
641 dd->out_offset = 0;
642 dd->out_sg = req->dst;
643
644 rctx = skcipher_request_ctx(req);
645 ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
646 rctx->mode &= TDES_FLAGS_MODE_MASK;
647 dd->flags = (dd->flags & ~TDES_FLAGS_MODE_MASK) | rctx->mode;
648 dd->ctx = ctx;
649 ctx->dd = dd;
650
651 err = atmel_tdes_write_ctrl(dd);
652 if (!err)
653 err = atmel_tdes_crypt_start(dd);
654 if (err) {
655
656 atmel_tdes_finish_req(dd, err);
657 tasklet_schedule(&dd->queue_task);
658 }
659
660 return ret;
661}
662
663static int atmel_tdes_crypt_dma_stop(struct atmel_tdes_dev *dd)
664{
665 int err = -EINVAL;
666 size_t count;
667
668 if (dd->flags & TDES_FLAGS_DMA) {
669 err = 0;
670 if (dd->flags & TDES_FLAGS_FAST) {
671 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
672 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
673 } else {
674 dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
675 dd->dma_size, DMA_FROM_DEVICE);
676
677
678 count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset,
679 dd->buf_out, dd->buflen, dd->dma_size, 1);
680 if (count != dd->dma_size) {
681 err = -EINVAL;
682 pr_err("not all data converted: %zu\n", count);
683 }
684 }
685 }
686 return err;
687}
688
689static int atmel_tdes_crypt(struct skcipher_request *req, unsigned long mode)
690{
691 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
692 struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(skcipher);
693 struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(req);
694
695 switch (mode & TDES_FLAGS_OPMODE_MASK) {
696 case TDES_FLAGS_CFB8:
697 if (!IS_ALIGNED(req->cryptlen, CFB8_BLOCK_SIZE)) {
698 pr_err("request size is not exact amount of CFB8 blocks\n");
699 return -EINVAL;
700 }
701 ctx->block_size = CFB8_BLOCK_SIZE;
702 break;
703
704 case TDES_FLAGS_CFB16:
705 if (!IS_ALIGNED(req->cryptlen, CFB16_BLOCK_SIZE)) {
706 pr_err("request size is not exact amount of CFB16 blocks\n");
707 return -EINVAL;
708 }
709 ctx->block_size = CFB16_BLOCK_SIZE;
710 break;
711
712 case TDES_FLAGS_CFB32:
713 if (!IS_ALIGNED(req->cryptlen, CFB32_BLOCK_SIZE)) {
714 pr_err("request size is not exact amount of CFB32 blocks\n");
715 return -EINVAL;
716 }
717 ctx->block_size = CFB32_BLOCK_SIZE;
718 break;
719
720 default:
721 if (!IS_ALIGNED(req->cryptlen, DES_BLOCK_SIZE)) {
722 pr_err("request size is not exact amount of DES blocks\n");
723 return -EINVAL;
724 }
725 ctx->block_size = DES_BLOCK_SIZE;
726 break;
727 }
728
729 rctx->mode = mode;
730
731 if ((mode & TDES_FLAGS_OPMODE_MASK) != TDES_FLAGS_ECB &&
732 !(mode & TDES_FLAGS_ENCRYPT) && req->src == req->dst) {
733 unsigned int ivsize = crypto_skcipher_ivsize(skcipher);
734
735 if (req->cryptlen >= ivsize)
736 scatterwalk_map_and_copy(rctx->lastc, req->src,
737 req->cryptlen - ivsize,
738 ivsize, 0);
739 }
740
741 return atmel_tdes_handle_queue(ctx->dd, req);
742}
743
744static int atmel_tdes_dma_init(struct atmel_tdes_dev *dd)
745{
746 int ret;
747
748
749 dd->dma_lch_in.chan = dma_request_chan(dd->dev, "tx");
750 if (IS_ERR(dd->dma_lch_in.chan)) {
751 ret = PTR_ERR(dd->dma_lch_in.chan);
752 goto err_dma_in;
753 }
754
755 dd->dma_lch_in.dma_conf.dst_addr = dd->phys_base +
756 TDES_IDATA1R;
757 dd->dma_lch_in.dma_conf.src_maxburst = 1;
758 dd->dma_lch_in.dma_conf.src_addr_width =
759 DMA_SLAVE_BUSWIDTH_4_BYTES;
760 dd->dma_lch_in.dma_conf.dst_maxburst = 1;
761 dd->dma_lch_in.dma_conf.dst_addr_width =
762 DMA_SLAVE_BUSWIDTH_4_BYTES;
763 dd->dma_lch_in.dma_conf.device_fc = false;
764
765 dd->dma_lch_out.chan = dma_request_chan(dd->dev, "rx");
766 if (IS_ERR(dd->dma_lch_out.chan)) {
767 ret = PTR_ERR(dd->dma_lch_out.chan);
768 goto err_dma_out;
769 }
770
771 dd->dma_lch_out.dma_conf.src_addr = dd->phys_base +
772 TDES_ODATA1R;
773 dd->dma_lch_out.dma_conf.src_maxburst = 1;
774 dd->dma_lch_out.dma_conf.src_addr_width =
775 DMA_SLAVE_BUSWIDTH_4_BYTES;
776 dd->dma_lch_out.dma_conf.dst_maxburst = 1;
777 dd->dma_lch_out.dma_conf.dst_addr_width =
778 DMA_SLAVE_BUSWIDTH_4_BYTES;
779 dd->dma_lch_out.dma_conf.device_fc = false;
780
781 return 0;
782
783err_dma_out:
784 dma_release_channel(dd->dma_lch_in.chan);
785err_dma_in:
786 dev_err(dd->dev, "no DMA channel available\n");
787 return ret;
788}
789
790static void atmel_tdes_dma_cleanup(struct atmel_tdes_dev *dd)
791{
792 dma_release_channel(dd->dma_lch_in.chan);
793 dma_release_channel(dd->dma_lch_out.chan);
794}
795
796static int atmel_des_setkey(struct crypto_skcipher *tfm, const u8 *key,
797 unsigned int keylen)
798{
799 struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(tfm);
800 int err;
801
802 err = verify_skcipher_des_key(tfm, key);
803 if (err)
804 return err;
805
806 memcpy(ctx->key, key, keylen);
807 ctx->keylen = keylen;
808
809 return 0;
810}
811
812static int atmel_tdes_setkey(struct crypto_skcipher *tfm, const u8 *key,
813 unsigned int keylen)
814{
815 struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(tfm);
816 int err;
817
818 err = verify_skcipher_des3_key(tfm, key);
819 if (err)
820 return err;
821
822 memcpy(ctx->key, key, keylen);
823 ctx->keylen = keylen;
824
825 return 0;
826}
827
828static int atmel_tdes_ecb_encrypt(struct skcipher_request *req)
829{
830 return atmel_tdes_crypt(req, TDES_FLAGS_ECB | TDES_FLAGS_ENCRYPT);
831}
832
833static int atmel_tdes_ecb_decrypt(struct skcipher_request *req)
834{
835 return atmel_tdes_crypt(req, TDES_FLAGS_ECB);
836}
837
838static int atmel_tdes_cbc_encrypt(struct skcipher_request *req)
839{
840 return atmel_tdes_crypt(req, TDES_FLAGS_CBC | TDES_FLAGS_ENCRYPT);
841}
842
843static int atmel_tdes_cbc_decrypt(struct skcipher_request *req)
844{
845 return atmel_tdes_crypt(req, TDES_FLAGS_CBC);
846}
847static int atmel_tdes_cfb_encrypt(struct skcipher_request *req)
848{
849 return atmel_tdes_crypt(req, TDES_FLAGS_CFB64 | TDES_FLAGS_ENCRYPT);
850}
851
852static int atmel_tdes_cfb_decrypt(struct skcipher_request *req)
853{
854 return atmel_tdes_crypt(req, TDES_FLAGS_CFB64);
855}
856
857static int atmel_tdes_cfb8_encrypt(struct skcipher_request *req)
858{
859 return atmel_tdes_crypt(req, TDES_FLAGS_CFB8 | TDES_FLAGS_ENCRYPT);
860}
861
862static int atmel_tdes_cfb8_decrypt(struct skcipher_request *req)
863{
864 return atmel_tdes_crypt(req, TDES_FLAGS_CFB8);
865}
866
867static int atmel_tdes_cfb16_encrypt(struct skcipher_request *req)
868{
869 return atmel_tdes_crypt(req, TDES_FLAGS_CFB16 | TDES_FLAGS_ENCRYPT);
870}
871
872static int atmel_tdes_cfb16_decrypt(struct skcipher_request *req)
873{
874 return atmel_tdes_crypt(req, TDES_FLAGS_CFB16);
875}
876
877static int atmel_tdes_cfb32_encrypt(struct skcipher_request *req)
878{
879 return atmel_tdes_crypt(req, TDES_FLAGS_CFB32 | TDES_FLAGS_ENCRYPT);
880}
881
882static int atmel_tdes_cfb32_decrypt(struct skcipher_request *req)
883{
884 return atmel_tdes_crypt(req, TDES_FLAGS_CFB32);
885}
886
887static int atmel_tdes_ofb_encrypt(struct skcipher_request *req)
888{
889 return atmel_tdes_crypt(req, TDES_FLAGS_OFB | TDES_FLAGS_ENCRYPT);
890}
891
892static int atmel_tdes_ofb_decrypt(struct skcipher_request *req)
893{
894 return atmel_tdes_crypt(req, TDES_FLAGS_OFB);
895}
896
897static int atmel_tdes_init_tfm(struct crypto_skcipher *tfm)
898{
899 struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(tfm);
900 struct atmel_tdes_dev *dd;
901
902 crypto_skcipher_set_reqsize(tfm, sizeof(struct atmel_tdes_reqctx));
903
904 dd = atmel_tdes_find_dev(ctx);
905 if (!dd)
906 return -ENODEV;
907
908 return 0;
909}
910
911static void atmel_tdes_skcipher_alg_init(struct skcipher_alg *alg)
912{
913 alg->base.cra_priority = ATMEL_TDES_PRIORITY;
914 alg->base.cra_flags = CRYPTO_ALG_ASYNC;
915 alg->base.cra_ctxsize = sizeof(struct atmel_tdes_ctx),
916 alg->base.cra_module = THIS_MODULE;
917
918 alg->init = atmel_tdes_init_tfm;
919}
920
921static struct skcipher_alg tdes_algs[] = {
922{
923 .base.cra_name = "ecb(des)",
924 .base.cra_driver_name = "atmel-ecb-des",
925 .base.cra_blocksize = DES_BLOCK_SIZE,
926 .base.cra_alignmask = 0x7,
927
928 .min_keysize = DES_KEY_SIZE,
929 .max_keysize = DES_KEY_SIZE,
930 .setkey = atmel_des_setkey,
931 .encrypt = atmel_tdes_ecb_encrypt,
932 .decrypt = atmel_tdes_ecb_decrypt,
933},
934{
935 .base.cra_name = "cbc(des)",
936 .base.cra_driver_name = "atmel-cbc-des",
937 .base.cra_blocksize = DES_BLOCK_SIZE,
938 .base.cra_alignmask = 0x7,
939
940 .min_keysize = DES_KEY_SIZE,
941 .max_keysize = DES_KEY_SIZE,
942 .ivsize = DES_BLOCK_SIZE,
943 .setkey = atmel_des_setkey,
944 .encrypt = atmel_tdes_cbc_encrypt,
945 .decrypt = atmel_tdes_cbc_decrypt,
946},
947{
948 .base.cra_name = "cfb(des)",
949 .base.cra_driver_name = "atmel-cfb-des",
950 .base.cra_blocksize = DES_BLOCK_SIZE,
951 .base.cra_alignmask = 0x7,
952
953 .min_keysize = DES_KEY_SIZE,
954 .max_keysize = DES_KEY_SIZE,
955 .ivsize = DES_BLOCK_SIZE,
956 .setkey = atmel_des_setkey,
957 .encrypt = atmel_tdes_cfb_encrypt,
958 .decrypt = atmel_tdes_cfb_decrypt,
959},
960{
961 .base.cra_name = "cfb8(des)",
962 .base.cra_driver_name = "atmel-cfb8-des",
963 .base.cra_blocksize = CFB8_BLOCK_SIZE,
964 .base.cra_alignmask = 0,
965
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_cfb8_encrypt,
971 .decrypt = atmel_tdes_cfb8_decrypt,
972},
973{
974 .base.cra_name = "cfb16(des)",
975 .base.cra_driver_name = "atmel-cfb16-des",
976 .base.cra_blocksize = CFB16_BLOCK_SIZE,
977 .base.cra_alignmask = 0x1,
978
979 .min_keysize = DES_KEY_SIZE,
980 .max_keysize = DES_KEY_SIZE,
981 .ivsize = DES_BLOCK_SIZE,
982 .setkey = atmel_des_setkey,
983 .encrypt = atmel_tdes_cfb16_encrypt,
984 .decrypt = atmel_tdes_cfb16_decrypt,
985},
986{
987 .base.cra_name = "cfb32(des)",
988 .base.cra_driver_name = "atmel-cfb32-des",
989 .base.cra_blocksize = CFB32_BLOCK_SIZE,
990 .base.cra_alignmask = 0x3,
991
992 .min_keysize = DES_KEY_SIZE,
993 .max_keysize = DES_KEY_SIZE,
994 .ivsize = DES_BLOCK_SIZE,
995 .setkey = atmel_des_setkey,
996 .encrypt = atmel_tdes_cfb32_encrypt,
997 .decrypt = atmel_tdes_cfb32_decrypt,
998},
999{
1000 .base.cra_name = "ofb(des)",
1001 .base.cra_driver_name = "atmel-ofb-des",
1002 .base.cra_blocksize = DES_BLOCK_SIZE,
1003 .base.cra_alignmask = 0x7,
1004
1005 .min_keysize = DES_KEY_SIZE,
1006 .max_keysize = DES_KEY_SIZE,
1007 .ivsize = DES_BLOCK_SIZE,
1008 .setkey = atmel_des_setkey,
1009 .encrypt = atmel_tdes_ofb_encrypt,
1010 .decrypt = atmel_tdes_ofb_decrypt,
1011},
1012{
1013 .base.cra_name = "ecb(des3_ede)",
1014 .base.cra_driver_name = "atmel-ecb-tdes",
1015 .base.cra_blocksize = DES_BLOCK_SIZE,
1016 .base.cra_alignmask = 0x7,
1017
1018 .min_keysize = DES3_EDE_KEY_SIZE,
1019 .max_keysize = DES3_EDE_KEY_SIZE,
1020 .setkey = atmel_tdes_setkey,
1021 .encrypt = atmel_tdes_ecb_encrypt,
1022 .decrypt = atmel_tdes_ecb_decrypt,
1023},
1024{
1025 .base.cra_name = "cbc(des3_ede)",
1026 .base.cra_driver_name = "atmel-cbc-tdes",
1027 .base.cra_blocksize = DES_BLOCK_SIZE,
1028 .base.cra_alignmask = 0x7,
1029
1030 .min_keysize = DES3_EDE_KEY_SIZE,
1031 .max_keysize = DES3_EDE_KEY_SIZE,
1032 .setkey = atmel_tdes_setkey,
1033 .encrypt = atmel_tdes_cbc_encrypt,
1034 .decrypt = atmel_tdes_cbc_decrypt,
1035 .ivsize = DES_BLOCK_SIZE,
1036},
1037{
1038 .base.cra_name = "ofb(des3_ede)",
1039 .base.cra_driver_name = "atmel-ofb-tdes",
1040 .base.cra_blocksize = DES_BLOCK_SIZE,
1041 .base.cra_alignmask = 0x7,
1042
1043 .min_keysize = DES3_EDE_KEY_SIZE,
1044 .max_keysize = DES3_EDE_KEY_SIZE,
1045 .setkey = atmel_tdes_setkey,
1046 .encrypt = atmel_tdes_ofb_encrypt,
1047 .decrypt = atmel_tdes_ofb_decrypt,
1048 .ivsize = DES_BLOCK_SIZE,
1049},
1050};
1051
1052static void atmel_tdes_queue_task(unsigned long data)
1053{
1054 struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *)data;
1055
1056 atmel_tdes_handle_queue(dd, NULL);
1057}
1058
1059static void atmel_tdes_done_task(unsigned long data)
1060{
1061 struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *) data;
1062 int err;
1063
1064 if (!(dd->flags & TDES_FLAGS_DMA))
1065 err = atmel_tdes_crypt_pdc_stop(dd);
1066 else
1067 err = atmel_tdes_crypt_dma_stop(dd);
1068
1069 if (dd->total && !err) {
1070 if (dd->flags & TDES_FLAGS_FAST) {
1071 dd->in_sg = sg_next(dd->in_sg);
1072 dd->out_sg = sg_next(dd->out_sg);
1073 if (!dd->in_sg || !dd->out_sg)
1074 err = -EINVAL;
1075 }
1076 if (!err)
1077 err = atmel_tdes_crypt_start(dd);
1078 if (!err)
1079 return;
1080 }
1081
1082 atmel_tdes_finish_req(dd, err);
1083 atmel_tdes_handle_queue(dd, NULL);
1084}
1085
1086static irqreturn_t atmel_tdes_irq(int irq, void *dev_id)
1087{
1088 struct atmel_tdes_dev *tdes_dd = dev_id;
1089 u32 reg;
1090
1091 reg = atmel_tdes_read(tdes_dd, TDES_ISR);
1092 if (reg & atmel_tdes_read(tdes_dd, TDES_IMR)) {
1093 atmel_tdes_write(tdes_dd, TDES_IDR, reg);
1094 if (TDES_FLAGS_BUSY & tdes_dd->flags)
1095 tasklet_schedule(&tdes_dd->done_task);
1096 else
1097 dev_warn(tdes_dd->dev, "TDES interrupt when no active requests.\n");
1098 return IRQ_HANDLED;
1099 }
1100
1101 return IRQ_NONE;
1102}
1103
1104static void atmel_tdes_unregister_algs(struct atmel_tdes_dev *dd)
1105{
1106 int i;
1107
1108 for (i = 0; i < ARRAY_SIZE(tdes_algs); i++)
1109 crypto_unregister_skcipher(&tdes_algs[i]);
1110}
1111
1112static int atmel_tdes_register_algs(struct atmel_tdes_dev *dd)
1113{
1114 int err, i, j;
1115
1116 for (i = 0; i < ARRAY_SIZE(tdes_algs); i++) {
1117 atmel_tdes_skcipher_alg_init(&tdes_algs[i]);
1118
1119 err = crypto_register_skcipher(&tdes_algs[i]);
1120 if (err)
1121 goto err_tdes_algs;
1122 }
1123
1124 return 0;
1125
1126err_tdes_algs:
1127 for (j = 0; j < i; j++)
1128 crypto_unregister_skcipher(&tdes_algs[j]);
1129
1130 return err;
1131}
1132
1133static void atmel_tdes_get_cap(struct atmel_tdes_dev *dd)
1134{
1135
1136 dd->caps.has_dma = 0;
1137 dd->caps.has_cfb_3keys = 0;
1138
1139
1140 switch (dd->hw_version & 0xf00) {
1141 case 0x700:
1142 dd->caps.has_dma = 1;
1143 dd->caps.has_cfb_3keys = 1;
1144 break;
1145 case 0x600:
1146 break;
1147 default:
1148 dev_warn(dd->dev,
1149 "Unmanaged tdes version, set minimum capabilities\n");
1150 break;
1151 }
1152}
1153
1154#if defined(CONFIG_OF)
1155static const struct of_device_id atmel_tdes_dt_ids[] = {
1156 { .compatible = "atmel,at91sam9g46-tdes" },
1157 { }
1158};
1159MODULE_DEVICE_TABLE(of, atmel_tdes_dt_ids);
1160#endif
1161
1162static int atmel_tdes_probe(struct platform_device *pdev)
1163{
1164 struct atmel_tdes_dev *tdes_dd;
1165 struct device *dev = &pdev->dev;
1166 struct resource *tdes_res;
1167 int err;
1168
1169 tdes_dd = devm_kmalloc(&pdev->dev, sizeof(*tdes_dd), GFP_KERNEL);
1170 if (!tdes_dd)
1171 return -ENOMEM;
1172
1173 tdes_dd->dev = dev;
1174
1175 platform_set_drvdata(pdev, tdes_dd);
1176
1177 INIT_LIST_HEAD(&tdes_dd->list);
1178 spin_lock_init(&tdes_dd->lock);
1179
1180 tasklet_init(&tdes_dd->done_task, atmel_tdes_done_task,
1181 (unsigned long)tdes_dd);
1182 tasklet_init(&tdes_dd->queue_task, atmel_tdes_queue_task,
1183 (unsigned long)tdes_dd);
1184
1185 crypto_init_queue(&tdes_dd->queue, ATMEL_TDES_QUEUE_LENGTH);
1186
1187
1188 tdes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1189 if (!tdes_res) {
1190 dev_err(dev, "no MEM resource info\n");
1191 err = -ENODEV;
1192 goto err_tasklet_kill;
1193 }
1194 tdes_dd->phys_base = tdes_res->start;
1195
1196
1197 tdes_dd->irq = platform_get_irq(pdev, 0);
1198 if (tdes_dd->irq < 0) {
1199 err = tdes_dd->irq;
1200 goto err_tasklet_kill;
1201 }
1202
1203 err = devm_request_irq(&pdev->dev, tdes_dd->irq, atmel_tdes_irq,
1204 IRQF_SHARED, "atmel-tdes", tdes_dd);
1205 if (err) {
1206 dev_err(dev, "unable to request tdes irq.\n");
1207 goto err_tasklet_kill;
1208 }
1209
1210
1211 tdes_dd->iclk = devm_clk_get(&pdev->dev, "tdes_clk");
1212 if (IS_ERR(tdes_dd->iclk)) {
1213 dev_err(dev, "clock initialization failed.\n");
1214 err = PTR_ERR(tdes_dd->iclk);
1215 goto err_tasklet_kill;
1216 }
1217
1218 tdes_dd->io_base = devm_ioremap_resource(&pdev->dev, tdes_res);
1219 if (IS_ERR(tdes_dd->io_base)) {
1220 dev_err(dev, "can't ioremap\n");
1221 err = PTR_ERR(tdes_dd->io_base);
1222 goto err_tasklet_kill;
1223 }
1224
1225 err = atmel_tdes_hw_version_init(tdes_dd);
1226 if (err)
1227 goto err_tasklet_kill;
1228
1229 atmel_tdes_get_cap(tdes_dd);
1230
1231 err = atmel_tdes_buff_init(tdes_dd);
1232 if (err)
1233 goto err_tasklet_kill;
1234
1235 if (tdes_dd->caps.has_dma) {
1236 err = atmel_tdes_dma_init(tdes_dd);
1237 if (err)
1238 goto err_buff_cleanup;
1239
1240 dev_info(dev, "using %s, %s for DMA transfers\n",
1241 dma_chan_name(tdes_dd->dma_lch_in.chan),
1242 dma_chan_name(tdes_dd->dma_lch_out.chan));
1243 }
1244
1245 spin_lock(&atmel_tdes.lock);
1246 list_add_tail(&tdes_dd->list, &atmel_tdes.dev_list);
1247 spin_unlock(&atmel_tdes.lock);
1248
1249 err = atmel_tdes_register_algs(tdes_dd);
1250 if (err)
1251 goto err_algs;
1252
1253 dev_info(dev, "Atmel DES/TDES\n");
1254
1255 return 0;
1256
1257err_algs:
1258 spin_lock(&atmel_tdes.lock);
1259 list_del(&tdes_dd->list);
1260 spin_unlock(&atmel_tdes.lock);
1261 if (tdes_dd->caps.has_dma)
1262 atmel_tdes_dma_cleanup(tdes_dd);
1263err_buff_cleanup:
1264 atmel_tdes_buff_cleanup(tdes_dd);
1265err_tasklet_kill:
1266 tasklet_kill(&tdes_dd->done_task);
1267 tasklet_kill(&tdes_dd->queue_task);
1268
1269 return err;
1270}
1271
1272static int atmel_tdes_remove(struct platform_device *pdev)
1273{
1274 struct atmel_tdes_dev *tdes_dd;
1275
1276 tdes_dd = platform_get_drvdata(pdev);
1277 if (!tdes_dd)
1278 return -ENODEV;
1279 spin_lock(&atmel_tdes.lock);
1280 list_del(&tdes_dd->list);
1281 spin_unlock(&atmel_tdes.lock);
1282
1283 atmel_tdes_unregister_algs(tdes_dd);
1284
1285 tasklet_kill(&tdes_dd->done_task);
1286 tasklet_kill(&tdes_dd->queue_task);
1287
1288 if (tdes_dd->caps.has_dma)
1289 atmel_tdes_dma_cleanup(tdes_dd);
1290
1291 atmel_tdes_buff_cleanup(tdes_dd);
1292
1293 return 0;
1294}
1295
1296static struct platform_driver atmel_tdes_driver = {
1297 .probe = atmel_tdes_probe,
1298 .remove = atmel_tdes_remove,
1299 .driver = {
1300 .name = "atmel_tdes",
1301 .of_match_table = of_match_ptr(atmel_tdes_dt_ids),
1302 },
1303};
1304
1305module_platform_driver(atmel_tdes_driver);
1306
1307MODULE_DESCRIPTION("Atmel DES/TDES hw acceleration support.");
1308MODULE_LICENSE("GPL v2");
1309MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
1310
