1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Cryptographic API.
4 *
5 * Support for ATMEL DES/TDES HW acceleration.
6 *
7 * Copyright (c) 2012 Eukréa Electromatique - ATMEL
8 * Author: Nicolas Royer <nicolas@eukrea.com>
9 *
10 * Some ideas are from omap-aes.c drivers.
11 */
12
13
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/init.h>
25 #include <linux/errno.h>
26 #include <linux/interrupt.h>
27 #include <linux/irq.h>
28 #include <linux/scatterlist.h>
29 #include <linux/dma-mapping.h>
30 #include <linux/of_device.h>
31 #include <linux/delay.h>
32 #include <linux/crypto.h>
33 #include <linux/cryptohash.h>
34 #include <crypto/scatterwalk.h>
35 #include <crypto/algapi.h>
36 #include <crypto/internal/des.h>
37 #include <crypto/hash.h>
38 #include <crypto/internal/hash.h>
39 #include <linux/platform_data/crypto-atmel.h>
40 #include "atmel-tdes-regs.h"
41
42 /* TDES flags */
43 #define TDES_FLAGS_MODE_MASK 0x00ff
44 #define TDES_FLAGS_ENCRYPT BIT(0)
45 #define TDES_FLAGS_CBC BIT(1)
46 #define TDES_FLAGS_CFB BIT(2)
47 #define TDES_FLAGS_CFB8 BIT(3)
48 #define TDES_FLAGS_CFB16 BIT(4)
49 #define TDES_FLAGS_CFB32 BIT(5)
50 #define TDES_FLAGS_CFB64 BIT(6)
51 #define TDES_FLAGS_OFB BIT(7)
52
53 #define TDES_FLAGS_INIT BIT(16)
54 #define TDES_FLAGS_FAST BIT(17)
55 #define TDES_FLAGS_BUSY BIT(18)
56 #define TDES_FLAGS_DMA BIT(19)
57
58 #define ATMEL_TDES_QUEUE_LENGTH 50
59
60 #define CFB8_BLOCK_SIZE 1
61 #define CFB16_BLOCK_SIZE 2
62 #define CFB32_BLOCK_SIZE 4
63
64 struct atmel_tdes_caps {
65 bool has_dma;
66 u32 has_cfb_3keys;
67 };
68
69 struct atmel_tdes_dev;
70
71 struct atmel_tdes_ctx {
72 struct atmel_tdes_dev *dd;
73
74 int keylen;
75 u32 key[3*DES_KEY_SIZE / sizeof(u32)];
76 unsigned long flags;
77
78 u16 block_size;
79 };
80
81 struct atmel_tdes_reqctx {
82 unsigned long mode;
83 };
84
85 struct atmel_tdes_dma {
86 struct dma_chan *chan;
87 struct dma_slave_config dma_conf;
88 };
89
90 struct atmel_tdes_dev {
91 struct list_head list;
92 unsigned long phys_base;
93 void __iomem *io_base;
94
95 struct atmel_tdes_ctx *ctx;
96 struct device *dev;
97 struct clk *iclk;
98 int irq;
99
100 unsigned long flags;
101 int err;
102
103 spinlock_t lock;
104 struct crypto_queue queue;
105
106 struct tasklet_struct done_task;
107 struct tasklet_struct queue_task;
108
109 struct ablkcipher_request *req;
110 size_t total;
111
112 struct scatterlist *in_sg;
113 unsigned int nb_in_sg;
114 size_t in_offset;
115 struct scatterlist *out_sg;
116 unsigned int nb_out_sg;
117 size_t out_offset;
118
119 size_t buflen;
120 size_t dma_size;
121
122 void *buf_in;
123 int dma_in;
124 dma_addr_t dma_addr_in;
125 struct atmel_tdes_dma dma_lch_in;
126
127 void *buf_out;
128 int dma_out;
129 dma_addr_t dma_addr_out;
130 struct atmel_tdes_dma dma_lch_out;
131
132 struct atmel_tdes_caps caps;
133
134 u32 hw_version;
135 };
136
137 struct atmel_tdes_drv {
138 struct list_head dev_list;
139 spinlock_t lock;
140 };
141
142 static struct atmel_tdes_drv atmel_tdes = {
143 .dev_list = LIST_HEAD_INIT(atmel_tdes.dev_list),
144 .lock = __SPIN_LOCK_UNLOCKED(atmel_tdes.lock),
145 };
146
atmel_tdes_sg_copy(struct scatterlist ** sg,size_t * offset,void * buf,size_t buflen,size_t total,int out)147 static int atmel_tdes_sg_copy(struct scatterlist **sg, size_t *offset,
148 void *buf, size_t buflen, size_t total, int out)
149 {
150 size_t count, off = 0;
151
152 while (buflen && total) {
153 count = min((*sg)->length - *offset, total);
154 count = min(count, buflen);
155
156 if (!count)
157 return off;
158
159 scatterwalk_map_and_copy(buf + off, *sg, *offset, count, out);
160
161 off += count;
162 buflen -= count;
163 *offset += count;
164 total -= count;
165
166 if (*offset == (*sg)->length) {
167 *sg = sg_next(*sg);
168 if (*sg)
169 *offset = 0;
170 else
171 total = 0;
172 }
173 }
174
175 return off;
176 }
177
atmel_tdes_read(struct atmel_tdes_dev * dd,u32 offset)178 static inline u32 atmel_tdes_read(struct atmel_tdes_dev *dd, u32 offset)
179 {
180 return readl_relaxed(dd->io_base + offset);
181 }
182
atmel_tdes_write(struct atmel_tdes_dev * dd,u32 offset,u32 value)183 static inline void atmel_tdes_write(struct atmel_tdes_dev *dd,
184 u32 offset, u32 value)
185 {
186 writel_relaxed(value, dd->io_base + offset);
187 }
188
atmel_tdes_write_n(struct atmel_tdes_dev * dd,u32 offset,u32 * value,int count)189 static void atmel_tdes_write_n(struct atmel_tdes_dev *dd, u32 offset,
190 u32 *value, int count)
191 {
192 for (; count--; value++, offset += 4)
193 atmel_tdes_write(dd, offset, *value);
194 }
195
atmel_tdes_find_dev(struct atmel_tdes_ctx * ctx)196 static struct atmel_tdes_dev *atmel_tdes_find_dev(struct atmel_tdes_ctx *ctx)
197 {
198 struct atmel_tdes_dev *tdes_dd = NULL;
199 struct atmel_tdes_dev *tmp;
200
201 spin_lock_bh(&atmel_tdes.lock);
202 if (!ctx->dd) {
203 list_for_each_entry(tmp, &atmel_tdes.dev_list, list) {
204 tdes_dd = tmp;
205 break;
206 }
207 ctx->dd = tdes_dd;
208 } else {
209 tdes_dd = ctx->dd;
210 }
211 spin_unlock_bh(&atmel_tdes.lock);
212
213 return tdes_dd;
214 }
215
atmel_tdes_hw_init(struct atmel_tdes_dev * dd)216 static int atmel_tdes_hw_init(struct atmel_tdes_dev *dd)
217 {
218 int err;
219
220 err = clk_prepare_enable(dd->iclk);
221 if (err)
222 return err;
223
224 if (!(dd->flags & TDES_FLAGS_INIT)) {
225 atmel_tdes_write(dd, TDES_CR, TDES_CR_SWRST);
226 dd->flags |= TDES_FLAGS_INIT;
227 dd->err = 0;
228 }
229
230 return 0;
231 }
232
atmel_tdes_get_version(struct atmel_tdes_dev * dd)233 static inline unsigned int atmel_tdes_get_version(struct atmel_tdes_dev *dd)
234 {
235 return atmel_tdes_read(dd, TDES_HW_VERSION) & 0x00000fff;
236 }
237
atmel_tdes_hw_version_init(struct atmel_tdes_dev * dd)238 static void atmel_tdes_hw_version_init(struct atmel_tdes_dev *dd)
239 {
240 atmel_tdes_hw_init(dd);
241
242 dd->hw_version = atmel_tdes_get_version(dd);
243
244 dev_info(dd->dev,
245 "version: 0x%x\n", dd->hw_version);
246
247 clk_disable_unprepare(dd->iclk);
248 }
249
atmel_tdes_dma_callback(void * data)250 static void atmel_tdes_dma_callback(void *data)
251 {
252 struct atmel_tdes_dev *dd = data;
253
254 /* dma_lch_out - completed */
255 tasklet_schedule(&dd->done_task);
256 }
257
atmel_tdes_write_ctrl(struct atmel_tdes_dev * dd)258 static int atmel_tdes_write_ctrl(struct atmel_tdes_dev *dd)
259 {
260 int err;
261 u32 valcr = 0, valmr = TDES_MR_SMOD_PDC;
262
263 err = atmel_tdes_hw_init(dd);
264
265 if (err)
266 return err;
267
268 if (!dd->caps.has_dma)
269 atmel_tdes_write(dd, TDES_PTCR,
270 TDES_PTCR_TXTDIS | TDES_PTCR_RXTDIS);
271
272 /* MR register must be set before IV registers */
273 if (dd->ctx->keylen > (DES_KEY_SIZE << 1)) {
274 valmr |= TDES_MR_KEYMOD_3KEY;
275 valmr |= TDES_MR_TDESMOD_TDES;
276 } else if (dd->ctx->keylen > DES_KEY_SIZE) {
277 valmr |= TDES_MR_KEYMOD_2KEY;
278 valmr |= TDES_MR_TDESMOD_TDES;
279 } else {
280 valmr |= TDES_MR_TDESMOD_DES;
281 }
282
283 if (dd->flags & TDES_FLAGS_CBC) {
284 valmr |= TDES_MR_OPMOD_CBC;
285 } else if (dd->flags & TDES_FLAGS_CFB) {
286 valmr |= TDES_MR_OPMOD_CFB;
287
288 if (dd->flags & TDES_FLAGS_CFB8)
289 valmr |= TDES_MR_CFBS_8b;
290 else if (dd->flags & TDES_FLAGS_CFB16)
291 valmr |= TDES_MR_CFBS_16b;
292 else if (dd->flags & TDES_FLAGS_CFB32)
293 valmr |= TDES_MR_CFBS_32b;
294 else if (dd->flags & TDES_FLAGS_CFB64)
295 valmr |= TDES_MR_CFBS_64b;
296 } else if (dd->flags & TDES_FLAGS_OFB) {
297 valmr |= TDES_MR_OPMOD_OFB;
298 }
299
300 if ((dd->flags & TDES_FLAGS_ENCRYPT) || (dd->flags & TDES_FLAGS_OFB))
301 valmr |= TDES_MR_CYPHER_ENC;
302
303 atmel_tdes_write(dd, TDES_CR, valcr);
304 atmel_tdes_write(dd, TDES_MR, valmr);
305
306 atmel_tdes_write_n(dd, TDES_KEY1W1R, dd->ctx->key,
307 dd->ctx->keylen >> 2);
308
309 if (((dd->flags & TDES_FLAGS_CBC) || (dd->flags & TDES_FLAGS_CFB) ||
310 (dd->flags & TDES_FLAGS_OFB)) && dd->req->info) {
311 atmel_tdes_write_n(dd, TDES_IV1R, dd->req->info, 2);
312 }
313
314 return 0;
315 }
316
atmel_tdes_crypt_pdc_stop(struct atmel_tdes_dev * dd)317 static int atmel_tdes_crypt_pdc_stop(struct atmel_tdes_dev *dd)
318 {
319 int err = 0;
320 size_t count;
321
322 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
323
324 if (dd->flags & TDES_FLAGS_FAST) {
325 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
326 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
327 } else {
328 dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
329 dd->dma_size, DMA_FROM_DEVICE);
330
331 /* copy data */
332 count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset,
333 dd->buf_out, dd->buflen, dd->dma_size, 1);
334 if (count != dd->dma_size) {
335 err = -EINVAL;
336 pr_err("not all data converted: %zu\n", count);
337 }
338 }
339
340 return err;
341 }
342
atmel_tdes_buff_init(struct atmel_tdes_dev * dd)343 static int atmel_tdes_buff_init(struct atmel_tdes_dev *dd)
344 {
345 int err = -ENOMEM;
346
347 dd->buf_in = (void *)__get_free_pages(GFP_KERNEL, 0);
348 dd->buf_out = (void *)__get_free_pages(GFP_KERNEL, 0);
349 dd->buflen = PAGE_SIZE;
350 dd->buflen &= ~(DES_BLOCK_SIZE - 1);
351
352 if (!dd->buf_in || !dd->buf_out) {
353 dev_err(dd->dev, "unable to alloc pages.\n");
354 goto err_alloc;
355 }
356
357 /* MAP here */
358 dd->dma_addr_in = dma_map_single(dd->dev, dd->buf_in,
359 dd->buflen, DMA_TO_DEVICE);
360 if (dma_mapping_error(dd->dev, dd->dma_addr_in)) {
361 dev_err(dd->dev, "dma %zd bytes error\n", dd->buflen);
362 err = -EINVAL;
363 goto err_map_in;
364 }
365
366 dd->dma_addr_out = dma_map_single(dd->dev, dd->buf_out,
367 dd->buflen, DMA_FROM_DEVICE);
368 if (dma_mapping_error(dd->dev, dd->dma_addr_out)) {
369 dev_err(dd->dev, "dma %zd bytes error\n", dd->buflen);
370 err = -EINVAL;
371 goto err_map_out;
372 }
373
374 return 0;
375
376 err_map_out:
377 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
378 DMA_TO_DEVICE);
379 err_map_in:
380 err_alloc:
381 free_page((unsigned long)dd->buf_out);
382 free_page((unsigned long)dd->buf_in);
383 if (err)
384 pr_err("error: %d\n", err);
385 return err;
386 }
387
atmel_tdes_buff_cleanup(struct atmel_tdes_dev * dd)388 static void atmel_tdes_buff_cleanup(struct atmel_tdes_dev *dd)
389 {
390 dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen,
391 DMA_FROM_DEVICE);
392 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
393 DMA_TO_DEVICE);
394 free_page((unsigned long)dd->buf_out);
395 free_page((unsigned long)dd->buf_in);
396 }
397
atmel_tdes_crypt_pdc(struct crypto_tfm * tfm,dma_addr_t dma_addr_in,dma_addr_t dma_addr_out,int length)398 static int atmel_tdes_crypt_pdc(struct crypto_tfm *tfm, dma_addr_t dma_addr_in,
399 dma_addr_t dma_addr_out, int length)
400 {
401 struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm);
402 struct atmel_tdes_dev *dd = ctx->dd;
403 int len32;
404
405 dd->dma_size = length;
406
407 if (!(dd->flags & TDES_FLAGS_FAST)) {
408 dma_sync_single_for_device(dd->dev, dma_addr_in, length,
409 DMA_TO_DEVICE);
410 }
411
412 if ((dd->flags & TDES_FLAGS_CFB) && (dd->flags & TDES_FLAGS_CFB8))
413 len32 = DIV_ROUND_UP(length, sizeof(u8));
414 else if ((dd->flags & TDES_FLAGS_CFB) && (dd->flags & TDES_FLAGS_CFB16))
415 len32 = DIV_ROUND_UP(length, sizeof(u16));
416 else
417 len32 = DIV_ROUND_UP(length, sizeof(u32));
418
419 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
420 atmel_tdes_write(dd, TDES_TPR, dma_addr_in);
421 atmel_tdes_write(dd, TDES_TCR, len32);
422 atmel_tdes_write(dd, TDES_RPR, dma_addr_out);
423 atmel_tdes_write(dd, TDES_RCR, len32);
424
425 /* Enable Interrupt */
426 atmel_tdes_write(dd, TDES_IER, TDES_INT_ENDRX);
427
428 /* Start DMA transfer */
429 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTEN | TDES_PTCR_RXTEN);
430
431 return 0;
432 }
433
atmel_tdes_crypt_dma(struct crypto_tfm * tfm,dma_addr_t dma_addr_in,dma_addr_t dma_addr_out,int length)434 static int atmel_tdes_crypt_dma(struct crypto_tfm *tfm, dma_addr_t dma_addr_in,
435 dma_addr_t dma_addr_out, int length)
436 {
437 struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm);
438 struct atmel_tdes_dev *dd = ctx->dd;
439 struct scatterlist sg[2];
440 struct dma_async_tx_descriptor *in_desc, *out_desc;
441
442 dd->dma_size = length;
443
444 if (!(dd->flags & TDES_FLAGS_FAST)) {
445 dma_sync_single_for_device(dd->dev, dma_addr_in, length,
446 DMA_TO_DEVICE);
447 }
448
449 if (dd->flags & TDES_FLAGS_CFB8) {
450 dd->dma_lch_in.dma_conf.dst_addr_width =
451 DMA_SLAVE_BUSWIDTH_1_BYTE;
452 dd->dma_lch_out.dma_conf.src_addr_width =
453 DMA_SLAVE_BUSWIDTH_1_BYTE;
454 } else if (dd->flags & TDES_FLAGS_CFB16) {
455 dd->dma_lch_in.dma_conf.dst_addr_width =
456 DMA_SLAVE_BUSWIDTH_2_BYTES;
457 dd->dma_lch_out.dma_conf.src_addr_width =
458 DMA_SLAVE_BUSWIDTH_2_BYTES;
459 } else {
460 dd->dma_lch_in.dma_conf.dst_addr_width =
461 DMA_SLAVE_BUSWIDTH_4_BYTES;
462 dd->dma_lch_out.dma_conf.src_addr_width =
463 DMA_SLAVE_BUSWIDTH_4_BYTES;
464 }
465
466 dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf);
467 dmaengine_slave_config(dd->dma_lch_out.chan, &dd->dma_lch_out.dma_conf);
468
469 dd->flags |= TDES_FLAGS_DMA;
470
471 sg_init_table(&sg[0], 1);
472 sg_dma_address(&sg[0]) = dma_addr_in;
473 sg_dma_len(&sg[0]) = length;
474
475 sg_init_table(&sg[1], 1);
476 sg_dma_address(&sg[1]) = dma_addr_out;
477 sg_dma_len(&sg[1]) = length;
478
479 in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, &sg[0],
480 1, DMA_MEM_TO_DEV,
481 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
482 if (!in_desc)
483 return -EINVAL;
484
485 out_desc = dmaengine_prep_slave_sg(dd->dma_lch_out.chan, &sg[1],
486 1, DMA_DEV_TO_MEM,
487 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
488 if (!out_desc)
489 return -EINVAL;
490
491 out_desc->callback = atmel_tdes_dma_callback;
492 out_desc->callback_param = dd;
493
494 dmaengine_submit(out_desc);
495 dma_async_issue_pending(dd->dma_lch_out.chan);
496
497 dmaengine_submit(in_desc);
498 dma_async_issue_pending(dd->dma_lch_in.chan);
499
500 return 0;
501 }
502
atmel_tdes_crypt_start(struct atmel_tdes_dev * dd)503 static int atmel_tdes_crypt_start(struct atmel_tdes_dev *dd)
504 {
505 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(
506 crypto_ablkcipher_reqtfm(dd->req));
507 int err, fast = 0, in, out;
508 size_t count;
509 dma_addr_t addr_in, addr_out;
510
511 if ((!dd->in_offset) && (!dd->out_offset)) {
512 /* check for alignment */
513 in = IS_ALIGNED((u32)dd->in_sg->offset, sizeof(u32)) &&
514 IS_ALIGNED(dd->in_sg->length, dd->ctx->block_size);
515 out = IS_ALIGNED((u32)dd->out_sg->offset, sizeof(u32)) &&
516 IS_ALIGNED(dd->out_sg->length, dd->ctx->block_size);
517 fast = in && out;
518
519 if (sg_dma_len(dd->in_sg) != sg_dma_len(dd->out_sg))
520 fast = 0;
521 }
522
523
524 if (fast) {
525 count = min_t(size_t, dd->total, sg_dma_len(dd->in_sg));
526 count = min_t(size_t, count, sg_dma_len(dd->out_sg));
527
528 err = dma_map_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
529 if (!err) {
530 dev_err(dd->dev, "dma_map_sg() error\n");
531 return -EINVAL;
532 }
533
534 err = dma_map_sg(dd->dev, dd->out_sg, 1,
535 DMA_FROM_DEVICE);
536 if (!err) {
537 dev_err(dd->dev, "dma_map_sg() error\n");
538 dma_unmap_sg(dd->dev, dd->in_sg, 1,
539 DMA_TO_DEVICE);
540 return -EINVAL;
541 }
542
543 addr_in = sg_dma_address(dd->in_sg);
544 addr_out = sg_dma_address(dd->out_sg);
545
546 dd->flags |= TDES_FLAGS_FAST;
547
548 } else {
549 /* use cache buffers */
550 count = atmel_tdes_sg_copy(&dd->in_sg, &dd->in_offset,
551 dd->buf_in, dd->buflen, dd->total, 0);
552
553 addr_in = dd->dma_addr_in;
554 addr_out = dd->dma_addr_out;
555
556 dd->flags &= ~TDES_FLAGS_FAST;
557 }
558
559 dd->total -= count;
560
561 if (dd->caps.has_dma)
562 err = atmel_tdes_crypt_dma(tfm, addr_in, addr_out, count);
563 else
564 err = atmel_tdes_crypt_pdc(tfm, addr_in, addr_out, count);
565
566 if (err && (dd->flags & TDES_FLAGS_FAST)) {
567 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
568 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_TO_DEVICE);
569 }
570
571 return err;
572 }
573
atmel_tdes_finish_req(struct atmel_tdes_dev * dd,int err)574 static void atmel_tdes_finish_req(struct atmel_tdes_dev *dd, int err)
575 {
576 struct ablkcipher_request *req = dd->req;
577
578 clk_disable_unprepare(dd->iclk);
579
580 dd->flags &= ~TDES_FLAGS_BUSY;
581
582 req->base.complete(&req->base, err);
583 }
584
atmel_tdes_handle_queue(struct atmel_tdes_dev * dd,struct ablkcipher_request * req)585 static int atmel_tdes_handle_queue(struct atmel_tdes_dev *dd,
586 struct ablkcipher_request *req)
587 {
588 struct crypto_async_request *async_req, *backlog;
589 struct atmel_tdes_ctx *ctx;
590 struct atmel_tdes_reqctx *rctx;
591 unsigned long flags;
592 int err, ret = 0;
593
594 spin_lock_irqsave(&dd->lock, flags);
595 if (req)
596 ret = ablkcipher_enqueue_request(&dd->queue, req);
597 if (dd->flags & TDES_FLAGS_BUSY) {
598 spin_unlock_irqrestore(&dd->lock, flags);
599 return ret;
600 }
601 backlog = crypto_get_backlog(&dd->queue);
602 async_req = crypto_dequeue_request(&dd->queue);
603 if (async_req)
604 dd->flags |= TDES_FLAGS_BUSY;
605 spin_unlock_irqrestore(&dd->lock, flags);
606
607 if (!async_req)
608 return ret;
609
610 if (backlog)
611 backlog->complete(backlog, -EINPROGRESS);
612
613 req = ablkcipher_request_cast(async_req);
614
615 /* assign new request to device */
616 dd->req = req;
617 dd->total = req->nbytes;
618 dd->in_offset = 0;
619 dd->in_sg = req->src;
620 dd->out_offset = 0;
621 dd->out_sg = req->dst;
622
623 rctx = ablkcipher_request_ctx(req);
624 ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
625 rctx->mode &= TDES_FLAGS_MODE_MASK;
626 dd->flags = (dd->flags & ~TDES_FLAGS_MODE_MASK) | rctx->mode;
627 dd->ctx = ctx;
628 ctx->dd = dd;
629
630 err = atmel_tdes_write_ctrl(dd);
631 if (!err)
632 err = atmel_tdes_crypt_start(dd);
633 if (err) {
634 /* des_task will not finish it, so do it here */
635 atmel_tdes_finish_req(dd, err);
636 tasklet_schedule(&dd->queue_task);
637 }
638
639 return ret;
640 }
641
atmel_tdes_crypt_dma_stop(struct atmel_tdes_dev * dd)642 static int atmel_tdes_crypt_dma_stop(struct atmel_tdes_dev *dd)
643 {
644 int err = -EINVAL;
645 size_t count;
646
647 if (dd->flags & TDES_FLAGS_DMA) {
648 err = 0;
649 if (dd->flags & TDES_FLAGS_FAST) {
650 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
651 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
652 } else {
653 dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
654 dd->dma_size, DMA_FROM_DEVICE);
655
656 /* copy data */
657 count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset,
658 dd->buf_out, dd->buflen, dd->dma_size, 1);
659 if (count != dd->dma_size) {
660 err = -EINVAL;
661 pr_err("not all data converted: %zu\n", count);
662 }
663 }
664 }
665 return err;
666 }
667
atmel_tdes_crypt(struct ablkcipher_request * req,unsigned long mode)668 static int atmel_tdes_crypt(struct ablkcipher_request *req, unsigned long mode)
669 {
670 struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(
671 crypto_ablkcipher_reqtfm(req));
672 struct atmel_tdes_reqctx *rctx = ablkcipher_request_ctx(req);
673
674 if (mode & TDES_FLAGS_CFB8) {
675 if (!IS_ALIGNED(req->nbytes, CFB8_BLOCK_SIZE)) {
676 pr_err("request size is not exact amount of CFB8 blocks\n");
677 return -EINVAL;
678 }
679 ctx->block_size = CFB8_BLOCK_SIZE;
680 } else if (mode & TDES_FLAGS_CFB16) {
681 if (!IS_ALIGNED(req->nbytes, CFB16_BLOCK_SIZE)) {
682 pr_err("request size is not exact amount of CFB16 blocks\n");
683 return -EINVAL;
684 }
685 ctx->block_size = CFB16_BLOCK_SIZE;
686 } else if (mode & TDES_FLAGS_CFB32) {
687 if (!IS_ALIGNED(req->nbytes, CFB32_BLOCK_SIZE)) {
688 pr_err("request size is not exact amount of CFB32 blocks\n");
689 return -EINVAL;
690 }
691 ctx->block_size = CFB32_BLOCK_SIZE;
692 } else {
693 if (!IS_ALIGNED(req->nbytes, DES_BLOCK_SIZE)) {
694 pr_err("request size is not exact amount of DES blocks\n");
695 return -EINVAL;
696 }
697 ctx->block_size = DES_BLOCK_SIZE;
698 }
699
700 rctx->mode = mode;
701
702 return atmel_tdes_handle_queue(ctx->dd, req);
703 }
704
atmel_tdes_filter(struct dma_chan * chan,void * slave)705 static bool atmel_tdes_filter(struct dma_chan *chan, void *slave)
706 {
707 struct at_dma_slave *sl = slave;
708
709 if (sl && sl->dma_dev == chan->device->dev) {
710 chan->private = sl;
711 return true;
712 } else {
713 return false;
714 }
715 }
716
atmel_tdes_dma_init(struct atmel_tdes_dev * dd,struct crypto_platform_data * pdata)717 static int atmel_tdes_dma_init(struct atmel_tdes_dev *dd,
718 struct crypto_platform_data *pdata)
719 {
720 dma_cap_mask_t mask;
721
722 dma_cap_zero(mask);
723 dma_cap_set(DMA_SLAVE, mask);
724
725 /* Try to grab 2 DMA channels */
726 dd->dma_lch_in.chan = dma_request_slave_channel_compat(mask,
727 atmel_tdes_filter, &pdata->dma_slave->rxdata, dd->dev, "tx");
728 if (!dd->dma_lch_in.chan)
729 goto err_dma_in;
730
731 dd->dma_lch_in.dma_conf.direction = DMA_MEM_TO_DEV;
732 dd->dma_lch_in.dma_conf.dst_addr = dd->phys_base +
733 TDES_IDATA1R;
734 dd->dma_lch_in.dma_conf.src_maxburst = 1;
735 dd->dma_lch_in.dma_conf.src_addr_width =
736 DMA_SLAVE_BUSWIDTH_4_BYTES;
737 dd->dma_lch_in.dma_conf.dst_maxburst = 1;
738 dd->dma_lch_in.dma_conf.dst_addr_width =
739 DMA_SLAVE_BUSWIDTH_4_BYTES;
740 dd->dma_lch_in.dma_conf.device_fc = false;
741
742 dd->dma_lch_out.chan = dma_request_slave_channel_compat(mask,
743 atmel_tdes_filter, &pdata->dma_slave->txdata, dd->dev, "rx");
744 if (!dd->dma_lch_out.chan)
745 goto err_dma_out;
746
747 dd->dma_lch_out.dma_conf.direction = DMA_DEV_TO_MEM;
748 dd->dma_lch_out.dma_conf.src_addr = dd->phys_base +
749 TDES_ODATA1R;
750 dd->dma_lch_out.dma_conf.src_maxburst = 1;
751 dd->dma_lch_out.dma_conf.src_addr_width =
752 DMA_SLAVE_BUSWIDTH_4_BYTES;
753 dd->dma_lch_out.dma_conf.dst_maxburst = 1;
754 dd->dma_lch_out.dma_conf.dst_addr_width =
755 DMA_SLAVE_BUSWIDTH_4_BYTES;
756 dd->dma_lch_out.dma_conf.device_fc = false;
757
758 return 0;
759
760 err_dma_out:
761 dma_release_channel(dd->dma_lch_in.chan);
762 err_dma_in:
763 dev_warn(dd->dev, "no DMA channel available\n");
764 return -ENODEV;
765 }
766
atmel_tdes_dma_cleanup(struct atmel_tdes_dev * dd)767 static void atmel_tdes_dma_cleanup(struct atmel_tdes_dev *dd)
768 {
769 dma_release_channel(dd->dma_lch_in.chan);
770 dma_release_channel(dd->dma_lch_out.chan);
771 }
772
atmel_des_setkey(struct crypto_ablkcipher * tfm,const u8 * key,unsigned int keylen)773 static int atmel_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
774 unsigned int keylen)
775 {
776 struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
777 int err;
778
779 err = verify_ablkcipher_des_key(tfm, key);
780 if (err)
781 return err;
782
783 memcpy(ctx->key, key, keylen);
784 ctx->keylen = keylen;
785
786 return 0;
787 }
788
atmel_tdes_setkey(struct crypto_ablkcipher * tfm,const u8 * key,unsigned int keylen)789 static int atmel_tdes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
790 unsigned int keylen)
791 {
792 struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
793 int err;
794
795 err = verify_ablkcipher_des3_key(tfm, key);
796 if (err)
797 return err;
798
799 memcpy(ctx->key, key, keylen);
800 ctx->keylen = keylen;
801
802 return 0;
803 }
804
atmel_tdes_ecb_encrypt(struct ablkcipher_request * req)805 static int atmel_tdes_ecb_encrypt(struct ablkcipher_request *req)
806 {
807 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT);
808 }
809
atmel_tdes_ecb_decrypt(struct ablkcipher_request * req)810 static int atmel_tdes_ecb_decrypt(struct ablkcipher_request *req)
811 {
812 return atmel_tdes_crypt(req, 0);
813 }
814
atmel_tdes_cbc_encrypt(struct ablkcipher_request * req)815 static int atmel_tdes_cbc_encrypt(struct ablkcipher_request *req)
816 {
817 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CBC);
818 }
819
atmel_tdes_cbc_decrypt(struct ablkcipher_request * req)820 static int atmel_tdes_cbc_decrypt(struct ablkcipher_request *req)
821 {
822 return atmel_tdes_crypt(req, TDES_FLAGS_CBC);
823 }
atmel_tdes_cfb_encrypt(struct ablkcipher_request * req)824 static int atmel_tdes_cfb_encrypt(struct ablkcipher_request *req)
825 {
826 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB);
827 }
828
atmel_tdes_cfb_decrypt(struct ablkcipher_request * req)829 static int atmel_tdes_cfb_decrypt(struct ablkcipher_request *req)
830 {
831 return atmel_tdes_crypt(req, TDES_FLAGS_CFB);
832 }
833
atmel_tdes_cfb8_encrypt(struct ablkcipher_request * req)834 static int atmel_tdes_cfb8_encrypt(struct ablkcipher_request *req)
835 {
836 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB |
837 TDES_FLAGS_CFB8);
838 }
839
atmel_tdes_cfb8_decrypt(struct ablkcipher_request * req)840 static int atmel_tdes_cfb8_decrypt(struct ablkcipher_request *req)
841 {
842 return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB8);
843 }
844
atmel_tdes_cfb16_encrypt(struct ablkcipher_request * req)845 static int atmel_tdes_cfb16_encrypt(struct ablkcipher_request *req)
846 {
847 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB |
848 TDES_FLAGS_CFB16);
849 }
850
atmel_tdes_cfb16_decrypt(struct ablkcipher_request * req)851 static int atmel_tdes_cfb16_decrypt(struct ablkcipher_request *req)
852 {
853 return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB16);
854 }
855
atmel_tdes_cfb32_encrypt(struct ablkcipher_request * req)856 static int atmel_tdes_cfb32_encrypt(struct ablkcipher_request *req)
857 {
858 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB |
859 TDES_FLAGS_CFB32);
860 }
861
atmel_tdes_cfb32_decrypt(struct ablkcipher_request * req)862 static int atmel_tdes_cfb32_decrypt(struct ablkcipher_request *req)
863 {
864 return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB32);
865 }
866
atmel_tdes_ofb_encrypt(struct ablkcipher_request * req)867 static int atmel_tdes_ofb_encrypt(struct ablkcipher_request *req)
868 {
869 return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_OFB);
870 }
871
atmel_tdes_ofb_decrypt(struct ablkcipher_request * req)872 static int atmel_tdes_ofb_decrypt(struct ablkcipher_request *req)
873 {
874 return atmel_tdes_crypt(req, TDES_FLAGS_OFB);
875 }
876
atmel_tdes_cra_init(struct crypto_tfm * tfm)877 static int atmel_tdes_cra_init(struct crypto_tfm *tfm)
878 {
879 struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm);
880 struct atmel_tdes_dev *dd;
881
882 tfm->crt_ablkcipher.reqsize = sizeof(struct atmel_tdes_reqctx);
883
884 dd = atmel_tdes_find_dev(ctx);
885 if (!dd)
886 return -ENODEV;
887
888 return 0;
889 }
890
891 static struct crypto_alg tdes_algs[] = {
892 {
893 .cra_name = "ecb(des)",
894 .cra_driver_name = "atmel-ecb-des",
895 .cra_priority = 100,
896 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
897 .cra_blocksize = DES_BLOCK_SIZE,
898 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
899 .cra_alignmask = 0x7,
900 .cra_type = &crypto_ablkcipher_type,
901 .cra_module = THIS_MODULE,
902 .cra_init = atmel_tdes_cra_init,
903 .cra_u.ablkcipher = {
904 .min_keysize = DES_KEY_SIZE,
905 .max_keysize = DES_KEY_SIZE,
906 .setkey = atmel_des_setkey,
907 .encrypt = atmel_tdes_ecb_encrypt,
908 .decrypt = atmel_tdes_ecb_decrypt,
909 }
910 },
911 {
912 .cra_name = "cbc(des)",
913 .cra_driver_name = "atmel-cbc-des",
914 .cra_priority = 100,
915 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
916 .cra_blocksize = DES_BLOCK_SIZE,
917 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
918 .cra_alignmask = 0x7,
919 .cra_type = &crypto_ablkcipher_type,
920 .cra_module = THIS_MODULE,
921 .cra_init = atmel_tdes_cra_init,
922 .cra_u.ablkcipher = {
923 .min_keysize = DES_KEY_SIZE,
924 .max_keysize = DES_KEY_SIZE,
925 .ivsize = DES_BLOCK_SIZE,
926 .setkey = atmel_des_setkey,
927 .encrypt = atmel_tdes_cbc_encrypt,
928 .decrypt = atmel_tdes_cbc_decrypt,
929 }
930 },
931 {
932 .cra_name = "cfb(des)",
933 .cra_driver_name = "atmel-cfb-des",
934 .cra_priority = 100,
935 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
936 .cra_blocksize = DES_BLOCK_SIZE,
937 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
938 .cra_alignmask = 0x7,
939 .cra_type = &crypto_ablkcipher_type,
940 .cra_module = THIS_MODULE,
941 .cra_init = atmel_tdes_cra_init,
942 .cra_u.ablkcipher = {
943 .min_keysize = DES_KEY_SIZE,
944 .max_keysize = DES_KEY_SIZE,
945 .ivsize = DES_BLOCK_SIZE,
946 .setkey = atmel_des_setkey,
947 .encrypt = atmel_tdes_cfb_encrypt,
948 .decrypt = atmel_tdes_cfb_decrypt,
949 }
950 },
951 {
952 .cra_name = "cfb8(des)",
953 .cra_driver_name = "atmel-cfb8-des",
954 .cra_priority = 100,
955 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
956 .cra_blocksize = CFB8_BLOCK_SIZE,
957 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
958 .cra_alignmask = 0,
959 .cra_type = &crypto_ablkcipher_type,
960 .cra_module = THIS_MODULE,
961 .cra_init = atmel_tdes_cra_init,
962 .cra_u.ablkcipher = {
963 .min_keysize = DES_KEY_SIZE,
964 .max_keysize = DES_KEY_SIZE,
965 .ivsize = DES_BLOCK_SIZE,
966 .setkey = atmel_des_setkey,
967 .encrypt = atmel_tdes_cfb8_encrypt,
968 .decrypt = atmel_tdes_cfb8_decrypt,
969 }
970 },
971 {
972 .cra_name = "cfb16(des)",
973 .cra_driver_name = "atmel-cfb16-des",
974 .cra_priority = 100,
975 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
976 .cra_blocksize = CFB16_BLOCK_SIZE,
977 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
978 .cra_alignmask = 0x1,
979 .cra_type = &crypto_ablkcipher_type,
980 .cra_module = THIS_MODULE,
981 .cra_init = atmel_tdes_cra_init,
982 .cra_u.ablkcipher = {
983 .min_keysize = DES_KEY_SIZE,
984 .max_keysize = DES_KEY_SIZE,
985 .ivsize = DES_BLOCK_SIZE,
986 .setkey = atmel_des_setkey,
987 .encrypt = atmel_tdes_cfb16_encrypt,
988 .decrypt = atmel_tdes_cfb16_decrypt,
989 }
990 },
991 {
992 .cra_name = "cfb32(des)",
993 .cra_driver_name = "atmel-cfb32-des",
994 .cra_priority = 100,
995 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
996 .cra_blocksize = CFB32_BLOCK_SIZE,
997 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
998 .cra_alignmask = 0x3,
999 .cra_type = &crypto_ablkcipher_type,
1000 .cra_module = THIS_MODULE,
1001 .cra_init = atmel_tdes_cra_init,
1002 .cra_u.ablkcipher = {
1003 .min_keysize = DES_KEY_SIZE,
1004 .max_keysize = DES_KEY_SIZE,
1005 .ivsize = DES_BLOCK_SIZE,
1006 .setkey = atmel_des_setkey,
1007 .encrypt = atmel_tdes_cfb32_encrypt,
1008 .decrypt = atmel_tdes_cfb32_decrypt,
1009 }
1010 },
1011 {
1012 .cra_name = "ofb(des)",
1013 .cra_driver_name = "atmel-ofb-des",
1014 .cra_priority = 100,
1015 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1016 .cra_blocksize = DES_BLOCK_SIZE,
1017 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1018 .cra_alignmask = 0x7,
1019 .cra_type = &crypto_ablkcipher_type,
1020 .cra_module = THIS_MODULE,
1021 .cra_init = atmel_tdes_cra_init,
1022 .cra_u.ablkcipher = {
1023 .min_keysize = DES_KEY_SIZE,
1024 .max_keysize = DES_KEY_SIZE,
1025 .ivsize = DES_BLOCK_SIZE,
1026 .setkey = atmel_des_setkey,
1027 .encrypt = atmel_tdes_ofb_encrypt,
1028 .decrypt = atmel_tdes_ofb_decrypt,
1029 }
1030 },
1031 {
1032 .cra_name = "ecb(des3_ede)",
1033 .cra_driver_name = "atmel-ecb-tdes",
1034 .cra_priority = 100,
1035 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1036 .cra_blocksize = DES_BLOCK_SIZE,
1037 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1038 .cra_alignmask = 0x7,
1039 .cra_type = &crypto_ablkcipher_type,
1040 .cra_module = THIS_MODULE,
1041 .cra_init = atmel_tdes_cra_init,
1042 .cra_u.ablkcipher = {
1043 .min_keysize = 3 * DES_KEY_SIZE,
1044 .max_keysize = 3 * DES_KEY_SIZE,
1045 .setkey = atmel_tdes_setkey,
1046 .encrypt = atmel_tdes_ecb_encrypt,
1047 .decrypt = atmel_tdes_ecb_decrypt,
1048 }
1049 },
1050 {
1051 .cra_name = "cbc(des3_ede)",
1052 .cra_driver_name = "atmel-cbc-tdes",
1053 .cra_priority = 100,
1054 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1055 .cra_blocksize = DES_BLOCK_SIZE,
1056 .cra_ctxsize = sizeof(struct atmel_tdes_ctx),
1057 .cra_alignmask = 0x7,
1058 .cra_type = &crypto_ablkcipher_type,
1059 .cra_module = THIS_MODULE,
1060 .cra_init = atmel_tdes_cra_init,
1061 .cra_u.ablkcipher = {
1062 .min_keysize = 3*DES_KEY_SIZE,
1063 .max_keysize = 3*DES_KEY_SIZE,
1064 .ivsize = DES_BLOCK_SIZE,
1065 .setkey = atmel_tdes_setkey,
1066 .encrypt = atmel_tdes_cbc_encrypt,
1067 .decrypt = atmel_tdes_cbc_decrypt,
1068 }
1069 },
1070 {
1071 .cra_name = "ofb(des3_ede)",
1072 .cra_driver_name = "atmel-ofb-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_u.ablkcipher = {
1082 .min_keysize = 3*DES_KEY_SIZE,
1083 .max_keysize = 3*DES_KEY_SIZE,
1084 .ivsize = DES_BLOCK_SIZE,
1085 .setkey = atmel_tdes_setkey,
1086 .encrypt = atmel_tdes_ofb_encrypt,
1087 .decrypt = atmel_tdes_ofb_decrypt,
1088 }
1089 },
1090 };
1091
atmel_tdes_queue_task(unsigned long data)1092 static void atmel_tdes_queue_task(unsigned long data)
1093 {
1094 struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *)data;
1095
1096 atmel_tdes_handle_queue(dd, NULL);
1097 }
1098
atmel_tdes_done_task(unsigned long data)1099 static void atmel_tdes_done_task(unsigned long data)
1100 {
1101 struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *) data;
1102 int err;
1103
1104 if (!(dd->flags & TDES_FLAGS_DMA))
1105 err = atmel_tdes_crypt_pdc_stop(dd);
1106 else
1107 err = atmel_tdes_crypt_dma_stop(dd);
1108
1109 err = dd->err ? : err;
1110
1111 if (dd->total && !err) {
1112 if (dd->flags & TDES_FLAGS_FAST) {
1113 dd->in_sg = sg_next(dd->in_sg);
1114 dd->out_sg = sg_next(dd->out_sg);
1115 if (!dd->in_sg || !dd->out_sg)
1116 err = -EINVAL;
1117 }
1118 if (!err)
1119 err = atmel_tdes_crypt_start(dd);
1120 if (!err)
1121 return; /* DMA started. Not fininishing. */
1122 }
1123
1124 atmel_tdes_finish_req(dd, err);
1125 atmel_tdes_handle_queue(dd, NULL);
1126 }
1127
atmel_tdes_irq(int irq,void * dev_id)1128 static irqreturn_t atmel_tdes_irq(int irq, void *dev_id)
1129 {
1130 struct atmel_tdes_dev *tdes_dd = dev_id;
1131 u32 reg;
1132
1133 reg = atmel_tdes_read(tdes_dd, TDES_ISR);
1134 if (reg & atmel_tdes_read(tdes_dd, TDES_IMR)) {
1135 atmel_tdes_write(tdes_dd, TDES_IDR, reg);
1136 if (TDES_FLAGS_BUSY & tdes_dd->flags)
1137 tasklet_schedule(&tdes_dd->done_task);
1138 else
1139 dev_warn(tdes_dd->dev, "TDES interrupt when no active requests.\n");
1140 return IRQ_HANDLED;
1141 }
1142
1143 return IRQ_NONE;
1144 }
1145
atmel_tdes_unregister_algs(struct atmel_tdes_dev * dd)1146 static void atmel_tdes_unregister_algs(struct atmel_tdes_dev *dd)
1147 {
1148 int i;
1149
1150 for (i = 0; i < ARRAY_SIZE(tdes_algs); i++)
1151 crypto_unregister_alg(&tdes_algs[i]);
1152 }
1153
atmel_tdes_register_algs(struct atmel_tdes_dev * dd)1154 static int atmel_tdes_register_algs(struct atmel_tdes_dev *dd)
1155 {
1156 int err, i, j;
1157
1158 for (i = 0; i < ARRAY_SIZE(tdes_algs); i++) {
1159 err = crypto_register_alg(&tdes_algs[i]);
1160 if (err)
1161 goto err_tdes_algs;
1162 }
1163
1164 return 0;
1165
1166 err_tdes_algs:
1167 for (j = 0; j < i; j++)
1168 crypto_unregister_alg(&tdes_algs[j]);
1169
1170 return err;
1171 }
1172
atmel_tdes_get_cap(struct atmel_tdes_dev * dd)1173 static void atmel_tdes_get_cap(struct atmel_tdes_dev *dd)
1174 {
1175
1176 dd->caps.has_dma = 0;
1177 dd->caps.has_cfb_3keys = 0;
1178
1179 /* keep only major version number */
1180 switch (dd->hw_version & 0xf00) {
1181 case 0x700:
1182 dd->caps.has_dma = 1;
1183 dd->caps.has_cfb_3keys = 1;
1184 break;
1185 case 0x600:
1186 break;
1187 default:
1188 dev_warn(dd->dev,
1189 "Unmanaged tdes version, set minimum capabilities\n");
1190 break;
1191 }
1192 }
1193
1194 #if defined(CONFIG_OF)
1195 static const struct of_device_id atmel_tdes_dt_ids[] = {
1196 { .compatible = "atmel,at91sam9g46-tdes" },
1197 { /* sentinel */ }
1198 };
1199 MODULE_DEVICE_TABLE(of, atmel_tdes_dt_ids);
1200
atmel_tdes_of_init(struct platform_device * pdev)1201 static struct crypto_platform_data *atmel_tdes_of_init(struct platform_device *pdev)
1202 {
1203 struct device_node *np = pdev->dev.of_node;
1204 struct crypto_platform_data *pdata;
1205
1206 if (!np) {
1207 dev_err(&pdev->dev, "device node not found\n");
1208 return ERR_PTR(-EINVAL);
1209 }
1210
1211 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
1212 if (!pdata)
1213 return ERR_PTR(-ENOMEM);
1214
1215 pdata->dma_slave = devm_kzalloc(&pdev->dev,
1216 sizeof(*(pdata->dma_slave)),
1217 GFP_KERNEL);
1218 if (!pdata->dma_slave)
1219 return ERR_PTR(-ENOMEM);
1220
1221 return pdata;
1222 }
1223 #else /* CONFIG_OF */
atmel_tdes_of_init(struct platform_device * pdev)1224 static inline struct crypto_platform_data *atmel_tdes_of_init(struct platform_device *pdev)
1225 {
1226 return ERR_PTR(-EINVAL);
1227 }
1228 #endif
1229
atmel_tdes_probe(struct platform_device * pdev)1230 static int atmel_tdes_probe(struct platform_device *pdev)
1231 {
1232 struct atmel_tdes_dev *tdes_dd;
1233 struct crypto_platform_data *pdata;
1234 struct device *dev = &pdev->dev;
1235 struct resource *tdes_res;
1236 int err;
1237
1238 tdes_dd = devm_kmalloc(&pdev->dev, sizeof(*tdes_dd), GFP_KERNEL);
1239 if (tdes_dd == NULL) {
1240 err = -ENOMEM;
1241 goto tdes_dd_err;
1242 }
1243
1244 tdes_dd->dev = dev;
1245
1246 platform_set_drvdata(pdev, tdes_dd);
1247
1248 INIT_LIST_HEAD(&tdes_dd->list);
1249 spin_lock_init(&tdes_dd->lock);
1250
1251 tasklet_init(&tdes_dd->done_task, atmel_tdes_done_task,
1252 (unsigned long)tdes_dd);
1253 tasklet_init(&tdes_dd->queue_task, atmel_tdes_queue_task,
1254 (unsigned long)tdes_dd);
1255
1256 crypto_init_queue(&tdes_dd->queue, ATMEL_TDES_QUEUE_LENGTH);
1257
1258 /* Get the base address */
1259 tdes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1260 if (!tdes_res) {
1261 dev_err(dev, "no MEM resource info\n");
1262 err = -ENODEV;
1263 goto res_err;
1264 }
1265 tdes_dd->phys_base = tdes_res->start;
1266
1267 /* Get the IRQ */
1268 tdes_dd->irq = platform_get_irq(pdev, 0);
1269 if (tdes_dd->irq < 0) {
1270 err = tdes_dd->irq;
1271 goto res_err;
1272 }
1273
1274 err = devm_request_irq(&pdev->dev, tdes_dd->irq, atmel_tdes_irq,
1275 IRQF_SHARED, "atmel-tdes", tdes_dd);
1276 if (err) {
1277 dev_err(dev, "unable to request tdes irq.\n");
1278 goto res_err;
1279 }
1280
1281 /* Initializing the clock */
1282 tdes_dd->iclk = devm_clk_get(&pdev->dev, "tdes_clk");
1283 if (IS_ERR(tdes_dd->iclk)) {
1284 dev_err(dev, "clock initialization failed.\n");
1285 err = PTR_ERR(tdes_dd->iclk);
1286 goto res_err;
1287 }
1288
1289 tdes_dd->io_base = devm_ioremap_resource(&pdev->dev, tdes_res);
1290 if (IS_ERR(tdes_dd->io_base)) {
1291 dev_err(dev, "can't ioremap\n");
1292 err = PTR_ERR(tdes_dd->io_base);
1293 goto res_err;
1294 }
1295
1296 atmel_tdes_hw_version_init(tdes_dd);
1297
1298 atmel_tdes_get_cap(tdes_dd);
1299
1300 err = atmel_tdes_buff_init(tdes_dd);
1301 if (err)
1302 goto err_tdes_buff;
1303
1304 if (tdes_dd->caps.has_dma) {
1305 pdata = pdev->dev.platform_data;
1306 if (!pdata) {
1307 pdata = atmel_tdes_of_init(pdev);
1308 if (IS_ERR(pdata)) {
1309 dev_err(&pdev->dev, "platform data not available\n");
1310 err = PTR_ERR(pdata);
1311 goto err_pdata;
1312 }
1313 }
1314 if (!pdata->dma_slave) {
1315 err = -ENXIO;
1316 goto err_pdata;
1317 }
1318 err = atmel_tdes_dma_init(tdes_dd, pdata);
1319 if (err)
1320 goto err_tdes_dma;
1321
1322 dev_info(dev, "using %s, %s for DMA transfers\n",
1323 dma_chan_name(tdes_dd->dma_lch_in.chan),
1324 dma_chan_name(tdes_dd->dma_lch_out.chan));
1325 }
1326
1327 spin_lock(&atmel_tdes.lock);
1328 list_add_tail(&tdes_dd->list, &atmel_tdes.dev_list);
1329 spin_unlock(&atmel_tdes.lock);
1330
1331 err = atmel_tdes_register_algs(tdes_dd);
1332 if (err)
1333 goto err_algs;
1334
1335 dev_info(dev, "Atmel DES/TDES\n");
1336
1337 return 0;
1338
1339 err_algs:
1340 spin_lock(&atmel_tdes.lock);
1341 list_del(&tdes_dd->list);
1342 spin_unlock(&atmel_tdes.lock);
1343 if (tdes_dd->caps.has_dma)
1344 atmel_tdes_dma_cleanup(tdes_dd);
1345 err_tdes_dma:
1346 err_pdata:
1347 atmel_tdes_buff_cleanup(tdes_dd);
1348 err_tdes_buff:
1349 res_err:
1350 tasklet_kill(&tdes_dd->done_task);
1351 tasklet_kill(&tdes_dd->queue_task);
1352 tdes_dd_err:
1353 dev_err(dev, "initialization failed.\n");
1354
1355 return err;
1356 }
1357
atmel_tdes_remove(struct platform_device * pdev)1358 static int atmel_tdes_remove(struct platform_device *pdev)
1359 {
1360 struct atmel_tdes_dev *tdes_dd;
1361
1362 tdes_dd = platform_get_drvdata(pdev);
1363 if (!tdes_dd)
1364 return -ENODEV;
1365 spin_lock(&atmel_tdes.lock);
1366 list_del(&tdes_dd->list);
1367 spin_unlock(&atmel_tdes.lock);
1368
1369 atmel_tdes_unregister_algs(tdes_dd);
1370
1371 tasklet_kill(&tdes_dd->done_task);
1372 tasklet_kill(&tdes_dd->queue_task);
1373
1374 if (tdes_dd->caps.has_dma)
1375 atmel_tdes_dma_cleanup(tdes_dd);
1376
1377 atmel_tdes_buff_cleanup(tdes_dd);
1378
1379 return 0;
1380 }
1381
1382 static struct platform_driver atmel_tdes_driver = {
1383 .probe = atmel_tdes_probe,
1384 .remove = atmel_tdes_remove,
1385 .driver = {
1386 .name = "atmel_tdes",
1387 .of_match_table = of_match_ptr(atmel_tdes_dt_ids),
1388 },
1389 };
1390
1391 module_platform_driver(atmel_tdes_driver);
1392
1393 MODULE_DESCRIPTION("Atmel DES/TDES hw acceleration support.");
1394 MODULE_LICENSE("GPL v2");
1395 MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
1396
