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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 / omap-aes.c
blobfbec0a2e76ddc7fc3d904de43ccbe5dd3ba5fced
1 /*
2 * Cryptographic API.
3 *
4 * Support for OMAP AES HW acceleration.
5 *
6 * Copyright (c) 2010 Nokia Corporation
7 * Author: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
8 * Copyright (c) 2011 Texas Instruments Incorporated
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as published
12 * by the Free Software Foundation.
13 *
14 */
15
16 #define pr_fmt(fmt) "%20s: " fmt, __func__
17 #define prn(num) pr_debug(#num "=%d\n", num)
18 #define prx(num) pr_debug(#num "=%x\n", num)
19
20 #include <linux/err.h>
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/errno.h>
24 #include <linux/kernel.h>
25 #include <linux/platform_device.h>
26 #include <linux/scatterlist.h>
27 #include <linux/dma-mapping.h>
28 #include <linux/dmaengine.h>
29 #include <linux/pm_runtime.h>
30 #include <linux/of.h>
31 #include <linux/of_device.h>
32 #include <linux/of_address.h>
33 #include <linux/io.h>
34 #include <linux/crypto.h>
35 #include <linux/interrupt.h>
36 #include <crypto/scatterwalk.h>
37 #include <crypto/aes.h>
38 #include <crypto/gcm.h>
39 #include <crypto/engine.h>
40 #include <crypto/internal/skcipher.h>
41 #include <crypto/internal/aead.h>
42
43 #include "omap-crypto.h"
44 #include "omap-aes.h"
45
46 /* keep registered devices data here */
47 static LIST_HEAD(dev_list);
48 static DEFINE_SPINLOCK(list_lock);
49
50 #ifdef DEBUG
51 #define omap_aes_read(dd, offset) \
52 ({ \
53 int _read_ret; \
54 _read_ret = __raw_readl(dd->io_base + offset); \
55 pr_debug("omap_aes_read(" #offset "=%#x)= %#x\n", \
56 offset, _read_ret); \
57 _read_ret; \
58 })
59 #else
60 inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset)
61 {
62 return __raw_readl(dd->io_base + offset);
63 }
64 #endif
65
66 #ifdef DEBUG
67 #define omap_aes_write(dd, offset, value) \
68 do { \
69 pr_debug("omap_aes_write(" #offset "=%#x) value=%#x\n", \
70 offset, value); \
71 __raw_writel(value, dd->io_base + offset); \
72 } while (0)
73 #else
74 inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset,
75 u32 value)
76 {
77 __raw_writel(value, dd->io_base + offset);
78 }
79 #endif
80
81 static inline void omap_aes_write_mask(struct omap_aes_dev *dd, u32 offset,
82 u32 value, u32 mask)
83 {
84 u32 val;
85
86 val = omap_aes_read(dd, offset);
87 val &= ~mask;
88 val |= value;
89 omap_aes_write(dd, offset, val);
90 }
91
92 static void omap_aes_write_n(struct omap_aes_dev *dd, u32 offset,
93 u32 *value, int count)
94 {
95 for (; count--; value++, offset += 4)
96 omap_aes_write(dd, offset, *value);
97 }
98
99 static int omap_aes_hw_init(struct omap_aes_dev *dd)
100 {
101 int err;
102
103 if (!(dd->flags & FLAGS_INIT)) {
104 dd->flags |= FLAGS_INIT;
105 dd->err = 0;
106 }
107
108 err = pm_runtime_get_sync(dd->dev);
109 if (err < 0) {
110 dev_err(dd->dev, "failed to get sync: %d\n", err);
111 return err;
112 }
113
114 return 0;
115 }
116
117 void omap_aes_clear_copy_flags(struct omap_aes_dev *dd)
118 {
119 dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_IN_DATA_ST_SHIFT);
120 dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_OUT_DATA_ST_SHIFT);
121 dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_ASSOC_DATA_ST_SHIFT);
122 }
123
124 int omap_aes_write_ctrl(struct omap_aes_dev *dd)
125 {
126 struct omap_aes_reqctx *rctx;
127 unsigned int key32;
128 int i, err;
129 u32 val;
130
131 err = omap_aes_hw_init(dd);
132 if (err)
133 return err;
134
135 key32 = dd->ctx->keylen / sizeof(u32);
136
137 /* RESET the key as previous HASH keys should not get affected*/
138 if (dd->flags & FLAGS_GCM)
139 for (i = 0; i < 0x40; i = i + 4)
140 omap_aes_write(dd, i, 0x0);
141
142 for (i = 0; i < key32; i++) {
143 omap_aes_write(dd, AES_REG_KEY(dd, i),
144 __le32_to_cpu(dd->ctx->key[i]));
145 }
146
147 if ((dd->flags & (FLAGS_CBC | FLAGS_CTR)) && dd->req->info)
148 omap_aes_write_n(dd, AES_REG_IV(dd, 0), dd->req->info, 4);
149
150 if ((dd->flags & (FLAGS_GCM)) && dd->aead_req->iv) {
151 rctx = aead_request_ctx(dd->aead_req);
152 omap_aes_write_n(dd, AES_REG_IV(dd, 0), (u32 *)rctx->iv, 4);
153 }
154
155 val = FLD_VAL(((dd->ctx->keylen >> 3) - 1), 4, 3);
156 if (dd->flags & FLAGS_CBC)
157 val |= AES_REG_CTRL_CBC;
158
159 if (dd->flags & (FLAGS_CTR | FLAGS_GCM))
160 val |= AES_REG_CTRL_CTR | AES_REG_CTRL_CTR_WIDTH_128;
161
162 if (dd->flags & FLAGS_GCM)
163 val |= AES_REG_CTRL_GCM;
164
165 if (dd->flags & FLAGS_ENCRYPT)
166 val |= AES_REG_CTRL_DIRECTION;
167
168 omap_aes_write_mask(dd, AES_REG_CTRL(dd), val, AES_REG_CTRL_MASK);
169
170 return 0;
171 }
172
173 static void omap_aes_dma_trigger_omap2(struct omap_aes_dev *dd, int length)
174 {
175 u32 mask, val;
176
177 val = dd->pdata->dma_start;
178
179 if (dd->dma_lch_out != NULL)
180 val |= dd->pdata->dma_enable_out;
181 if (dd->dma_lch_in != NULL)
182 val |= dd->pdata->dma_enable_in;
183
184 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
185 dd->pdata->dma_start;
186
187 omap_aes_write_mask(dd, AES_REG_MASK(dd), val, mask);
188
189 }
190
191 static void omap_aes_dma_trigger_omap4(struct omap_aes_dev *dd, int length)
192 {
193 omap_aes_write(dd, AES_REG_LENGTH_N(0), length);
194 omap_aes_write(dd, AES_REG_LENGTH_N(1), 0);
195 if (dd->flags & FLAGS_GCM)
196 omap_aes_write(dd, AES_REG_A_LEN, dd->assoc_len);
197
198 omap_aes_dma_trigger_omap2(dd, length);
199 }
200
201 static void omap_aes_dma_stop(struct omap_aes_dev *dd)
202 {
203 u32 mask;
204
205 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
206 dd->pdata->dma_start;
207
208 omap_aes_write_mask(dd, AES_REG_MASK(dd), 0, mask);
209 }
210
211 struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_reqctx *rctx)
212 {
213 struct omap_aes_dev *dd;
214
215 spin_lock_bh(&list_lock);
216 dd = list_first_entry(&dev_list, struct omap_aes_dev, list);
217 list_move_tail(&dd->list, &dev_list);
218 rctx->dd = dd;
219 spin_unlock_bh(&list_lock);
220
221 return dd;
222 }
223
224 static void omap_aes_dma_out_callback(void *data)
225 {
226 struct omap_aes_dev *dd = data;
227
228 /* dma_lch_out - completed */
229 tasklet_schedule(&dd->done_task);
230 }
231
232 static int omap_aes_dma_init(struct omap_aes_dev *dd)
233 {
234 int err;
235
236 dd->dma_lch_out = NULL;
237 dd->dma_lch_in = NULL;
238
239 dd->dma_lch_in = dma_request_chan(dd->dev, "rx");
240 if (IS_ERR(dd->dma_lch_in)) {
241 dev_err(dd->dev, "Unable to request in DMA channel\n");
242 return PTR_ERR(dd->dma_lch_in);
243 }
244
245 dd->dma_lch_out = dma_request_chan(dd->dev, "tx");
246 if (IS_ERR(dd->dma_lch_out)) {
247 dev_err(dd->dev, "Unable to request out DMA channel\n");
248 err = PTR_ERR(dd->dma_lch_out);
249 goto err_dma_out;
250 }
251
252 return 0;
253
254 err_dma_out:
255 dma_release_channel(dd->dma_lch_in);
256
257 return err;
258 }
259
260 static void omap_aes_dma_cleanup(struct omap_aes_dev *dd)
261 {
262 if (dd->pio_only)
263 return;
264
265 dma_release_channel(dd->dma_lch_out);
266 dma_release_channel(dd->dma_lch_in);
267 }
268
269 static int omap_aes_crypt_dma(struct omap_aes_dev *dd,
270 struct scatterlist *in_sg,
271 struct scatterlist *out_sg,
272 int in_sg_len, int out_sg_len)
273 {
274 struct dma_async_tx_descriptor *tx_in, *tx_out;
275 struct dma_slave_config cfg;
276 int ret;
277
278 if (dd->pio_only) {
279 scatterwalk_start(&dd->in_walk, dd->in_sg);
280 scatterwalk_start(&dd->out_walk, dd->out_sg);
281
282 /* Enable DATAIN interrupt and let it take
283 care of the rest */
284 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
285 return 0;
286 }
287
288 dma_sync_sg_for_device(dd->dev, dd->in_sg, in_sg_len, DMA_TO_DEVICE);
289
290 memset(&cfg, 0, sizeof(cfg));
291
292 cfg.src_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
293 cfg.dst_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
294 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
295 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
296 cfg.src_maxburst = DST_MAXBURST;
297 cfg.dst_maxburst = DST_MAXBURST;
298
299 /* IN */
300 ret = dmaengine_slave_config(dd->dma_lch_in, &cfg);
301 if (ret) {
302 dev_err(dd->dev, "can't configure IN dmaengine slave: %d\n",
303 ret);
304 return ret;
305 }
306
307 tx_in = dmaengine_prep_slave_sg(dd->dma_lch_in, in_sg, in_sg_len,
308 DMA_MEM_TO_DEV,
309 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
310 if (!tx_in) {
311 dev_err(dd->dev, "IN prep_slave_sg() failed\n");
312 return -EINVAL;
313 }
314
315 /* No callback necessary */
316 tx_in->callback_param = dd;
317
318 /* OUT */
319 ret = dmaengine_slave_config(dd->dma_lch_out, &cfg);
320 if (ret) {
321 dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n",
322 ret);
323 return ret;
324 }
325
326 tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg, out_sg_len,
327 DMA_DEV_TO_MEM,
328 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
329 if (!tx_out) {
330 dev_err(dd->dev, "OUT prep_slave_sg() failed\n");
331 return -EINVAL;
332 }
333
334 if (dd->flags & FLAGS_GCM)
335 tx_out->callback = omap_aes_gcm_dma_out_callback;
336 else
337 tx_out->callback = omap_aes_dma_out_callback;
338 tx_out->callback_param = dd;
339
340 dmaengine_submit(tx_in);
341 dmaengine_submit(tx_out);
342
343 dma_async_issue_pending(dd->dma_lch_in);
344 dma_async_issue_pending(dd->dma_lch_out);
345
346 /* start DMA */
347 dd->pdata->trigger(dd, dd->total);
348
349 return 0;
350 }
351
352 int omap_aes_crypt_dma_start(struct omap_aes_dev *dd)
353 {
354 int err;
355
356 pr_debug("total: %d\n", dd->total);
357
358 if (!dd->pio_only) {
359 err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len,
360 DMA_TO_DEVICE);
361 if (!err) {
362 dev_err(dd->dev, "dma_map_sg() error\n");
363 return -EINVAL;
364 }
365
366 err = dma_map_sg(dd->dev, dd->out_sg, dd->out_sg_len,
367 DMA_FROM_DEVICE);
368 if (!err) {
369 dev_err(dd->dev, "dma_map_sg() error\n");
370 return -EINVAL;
371 }
372 }
373
374 err = omap_aes_crypt_dma(dd, dd->in_sg, dd->out_sg, dd->in_sg_len,
375 dd->out_sg_len);
376 if (err && !dd->pio_only) {
377 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
378 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
379 DMA_FROM_DEVICE);
380 }
381
382 return err;
383 }
384
385 static void omap_aes_finish_req(struct omap_aes_dev *dd, int err)
386 {
387 struct ablkcipher_request *req = dd->req;
388
389 pr_debug("err: %d\n", err);
390
391 crypto_finalize_cipher_request(dd->engine, req, err);
392
393 pm_runtime_mark_last_busy(dd->dev);
394 pm_runtime_put_autosuspend(dd->dev);
395 }
396
397 int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd)
398 {
399 pr_debug("total: %d\n", dd->total);
400
401 omap_aes_dma_stop(dd);
402
403
404 return 0;
405 }
406
407 static int omap_aes_handle_queue(struct omap_aes_dev *dd,
408 struct ablkcipher_request *req)
409 {
410 if (req)
411 return crypto_transfer_cipher_request_to_engine(dd->engine, req);
412
413 return 0;
414 }
415
416 static int omap_aes_prepare_req(struct crypto_engine *engine,
417 struct ablkcipher_request *req)
418 {
419 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
420 crypto_ablkcipher_reqtfm(req));
421 struct omap_aes_reqctx *rctx = ablkcipher_request_ctx(req);
422 struct omap_aes_dev *dd = rctx->dd;
423 int ret;
424 u16 flags;
425
426 if (!dd)
427 return -ENODEV;
428
429 /* assign new request to device */
430 dd->req = req;
431 dd->total = req->nbytes;
432 dd->total_save = req->nbytes;
433 dd->in_sg = req->src;
434 dd->out_sg = req->dst;
435 dd->orig_out = req->dst;
436
437 flags = OMAP_CRYPTO_COPY_DATA;
438 if (req->src == req->dst)
439 flags |= OMAP_CRYPTO_FORCE_COPY;
440
441 ret = omap_crypto_align_sg(&dd->in_sg, dd->total, AES_BLOCK_SIZE,
442 dd->in_sgl, flags,
443 FLAGS_IN_DATA_ST_SHIFT, &dd->flags);
444 if (ret)
445 return ret;
446
447 ret = omap_crypto_align_sg(&dd->out_sg, dd->total, AES_BLOCK_SIZE,
448 &dd->out_sgl, 0,
449 FLAGS_OUT_DATA_ST_SHIFT, &dd->flags);
450 if (ret)
451 return ret;
452
453 dd->in_sg_len = sg_nents_for_len(dd->in_sg, dd->total);
454 if (dd->in_sg_len < 0)
455 return dd->in_sg_len;
456
457 dd->out_sg_len = sg_nents_for_len(dd->out_sg, dd->total);
458 if (dd->out_sg_len < 0)
459 return dd->out_sg_len;
460
461 rctx->mode &= FLAGS_MODE_MASK;
462 dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
463
464 dd->ctx = ctx;
465 rctx->dd = dd;
466
467 return omap_aes_write_ctrl(dd);
468 }
469
470 static int omap_aes_crypt_req(struct crypto_engine *engine,
471 struct ablkcipher_request *req)
472 {
473 struct omap_aes_reqctx *rctx = ablkcipher_request_ctx(req);
474 struct omap_aes_dev *dd = rctx->dd;
475
476 if (!dd)
477 return -ENODEV;
478
479 return omap_aes_crypt_dma_start(dd);
480 }
481
482 static void omap_aes_done_task(unsigned long data)
483 {
484 struct omap_aes_dev *dd = (struct omap_aes_dev *)data;
485
486 pr_debug("enter done_task\n");
487
488 if (!dd->pio_only) {
489 dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len,
490 DMA_FROM_DEVICE);
491 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
492 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
493 DMA_FROM_DEVICE);
494 omap_aes_crypt_dma_stop(dd);
495 }
496
497 omap_crypto_cleanup(dd->in_sgl, NULL, 0, dd->total_save,
498 FLAGS_IN_DATA_ST_SHIFT, dd->flags);
499
500 omap_crypto_cleanup(&dd->out_sgl, dd->orig_out, 0, dd->total_save,
501 FLAGS_OUT_DATA_ST_SHIFT, dd->flags);
502
503 omap_aes_finish_req(dd, 0);
504
505 pr_debug("exit\n");
506 }
507
508 static int omap_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
509 {
510 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
511 crypto_ablkcipher_reqtfm(req));
512 struct omap_aes_reqctx *rctx = ablkcipher_request_ctx(req);
513 struct omap_aes_dev *dd;
514 int ret;
515
516 pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->nbytes,
517 !!(mode & FLAGS_ENCRYPT),
518 !!(mode & FLAGS_CBC));
519
520 if (req->nbytes < 200) {
521 SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback);
522
523 skcipher_request_set_tfm(subreq, ctx->fallback);
524 skcipher_request_set_callback(subreq, req->base.flags, NULL,
525 NULL);
526 skcipher_request_set_crypt(subreq, req->src, req->dst,
527 req->nbytes, req->info);
528
529 if (mode & FLAGS_ENCRYPT)
530 ret = crypto_skcipher_encrypt(subreq);
531 else
532 ret = crypto_skcipher_decrypt(subreq);
533
534 skcipher_request_zero(subreq);
535 return ret;
536 }
537 dd = omap_aes_find_dev(rctx);
538 if (!dd)
539 return -ENODEV;
540
541 rctx->mode = mode;
542
543 return omap_aes_handle_queue(dd, req);
544 }
545
546 /* ********************** ALG API ************************************ */
547
548 static int omap_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
549 unsigned int keylen)
550 {
551 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
552 int ret;
553
554 if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
555 keylen != AES_KEYSIZE_256)
556 return -EINVAL;
557
558 pr_debug("enter, keylen: %d\n", keylen);
559
560 memcpy(ctx->key, key, keylen);
561 ctx->keylen = keylen;
562
563 crypto_skcipher_clear_flags(ctx->fallback, CRYPTO_TFM_REQ_MASK);
564 crypto_skcipher_set_flags(ctx->fallback, tfm->base.crt_flags &
565 CRYPTO_TFM_REQ_MASK);
566
567 ret = crypto_skcipher_setkey(ctx->fallback, key, keylen);
568 if (!ret)
569 return 0;
570
571 return 0;
572 }
573
574 static int omap_aes_ecb_encrypt(struct ablkcipher_request *req)
575 {
576 return omap_aes_crypt(req, FLAGS_ENCRYPT);
577 }
578
579 static int omap_aes_ecb_decrypt(struct ablkcipher_request *req)
580 {
581 return omap_aes_crypt(req, 0);
582 }
583
584 static int omap_aes_cbc_encrypt(struct ablkcipher_request *req)
585 {
586 return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
587 }
588
589 static int omap_aes_cbc_decrypt(struct ablkcipher_request *req)
590 {
591 return omap_aes_crypt(req, FLAGS_CBC);
592 }
593
594 static int omap_aes_ctr_encrypt(struct ablkcipher_request *req)
595 {
596 return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CTR);
597 }
598
599 static int omap_aes_ctr_decrypt(struct ablkcipher_request *req)
600 {
601 return omap_aes_crypt(req, FLAGS_CTR);
602 }
603
604 static int omap_aes_cra_init(struct crypto_tfm *tfm)
605 {
606 const char *name = crypto_tfm_alg_name(tfm);
607 const u32 flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK;
608 struct omap_aes_ctx *ctx = crypto_tfm_ctx(tfm);
609 struct crypto_skcipher *blk;
610
611 blk = crypto_alloc_skcipher(name, 0, flags);
612 if (IS_ERR(blk))
613 return PTR_ERR(blk);
614
615 ctx->fallback = blk;
616
617 tfm->crt_ablkcipher.reqsize = sizeof(struct omap_aes_reqctx);
618
619 return 0;
620 }
621
622 static int omap_aes_gcm_cra_init(struct crypto_aead *tfm)
623 {
624 struct omap_aes_dev *dd = NULL;
625 struct omap_aes_ctx *ctx = crypto_aead_ctx(tfm);
626 int err;
627
628 /* Find AES device, currently picks the first device */
629 spin_lock_bh(&list_lock);
630 list_for_each_entry(dd, &dev_list, list) {
631 break;
632 }
633 spin_unlock_bh(&list_lock);
634
635 err = pm_runtime_get_sync(dd->dev);
636 if (err < 0) {
637 dev_err(dd->dev, "%s: failed to get_sync(%d)\n",
638 __func__, err);
639 return err;
640 }
641
642 tfm->reqsize = sizeof(struct omap_aes_reqctx);
643 ctx->ctr = crypto_alloc_skcipher("ecb(aes)", 0, 0);
644 if (IS_ERR(ctx->ctr)) {
645 pr_warn("could not load aes driver for encrypting IV\n");
646 return PTR_ERR(ctx->ctr);
647 }
648
649 return 0;
650 }
651
652 static void omap_aes_cra_exit(struct crypto_tfm *tfm)
653 {
654 struct omap_aes_ctx *ctx = crypto_tfm_ctx(tfm);
655
656 if (ctx->fallback)
657 crypto_free_skcipher(ctx->fallback);
658
659 ctx->fallback = NULL;
660 }
661
662 static void omap_aes_gcm_cra_exit(struct crypto_aead *tfm)
663 {
664 struct omap_aes_ctx *ctx = crypto_aead_ctx(tfm);
665
666 omap_aes_cra_exit(crypto_aead_tfm(tfm));
667
668 if (ctx->ctr)
669 crypto_free_skcipher(ctx->ctr);
670 }
671
672 /* ********************** ALGS ************************************ */
673
674 static struct crypto_alg algs_ecb_cbc[] = {
675 {
676 .cra_name = "ecb(aes)",
677 .cra_driver_name = "ecb-aes-omap",
678 .cra_priority = 300,
679 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
680 CRYPTO_ALG_KERN_DRIVER_ONLY |
681 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
682 .cra_blocksize = AES_BLOCK_SIZE,
683 .cra_ctxsize = sizeof(struct omap_aes_ctx),
684 .cra_alignmask = 0,
685 .cra_type = &crypto_ablkcipher_type,
686 .cra_module = THIS_MODULE,
687 .cra_init = omap_aes_cra_init,
688 .cra_exit = omap_aes_cra_exit,
689 .cra_u.ablkcipher = {
690 .min_keysize = AES_MIN_KEY_SIZE,
691 .max_keysize = AES_MAX_KEY_SIZE,
692 .setkey = omap_aes_setkey,
693 .encrypt = omap_aes_ecb_encrypt,
694 .decrypt = omap_aes_ecb_decrypt,
695 }
696 },
697 {
698 .cra_name = "cbc(aes)",
699 .cra_driver_name = "cbc-aes-omap",
700 .cra_priority = 300,
701 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
702 CRYPTO_ALG_KERN_DRIVER_ONLY |
703 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
704 .cra_blocksize = AES_BLOCK_SIZE,
705 .cra_ctxsize = sizeof(struct omap_aes_ctx),
706 .cra_alignmask = 0,
707 .cra_type = &crypto_ablkcipher_type,
708 .cra_module = THIS_MODULE,
709 .cra_init = omap_aes_cra_init,
710 .cra_exit = omap_aes_cra_exit,
711 .cra_u.ablkcipher = {
712 .min_keysize = AES_MIN_KEY_SIZE,
713 .max_keysize = AES_MAX_KEY_SIZE,
714 .ivsize = AES_BLOCK_SIZE,
715 .setkey = omap_aes_setkey,
716 .encrypt = omap_aes_cbc_encrypt,
717 .decrypt = omap_aes_cbc_decrypt,
718 }
719 }
720 };
721
722 static struct crypto_alg algs_ctr[] = {
723 {
724 .cra_name = "ctr(aes)",
725 .cra_driver_name = "ctr-aes-omap",
726 .cra_priority = 300,
727 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
728 CRYPTO_ALG_KERN_DRIVER_ONLY |
729 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
730 .cra_blocksize = AES_BLOCK_SIZE,
731 .cra_ctxsize = sizeof(struct omap_aes_ctx),
732 .cra_alignmask = 0,
733 .cra_type = &crypto_ablkcipher_type,
734 .cra_module = THIS_MODULE,
735 .cra_init = omap_aes_cra_init,
736 .cra_exit = omap_aes_cra_exit,
737 .cra_u.ablkcipher = {
738 .min_keysize = AES_MIN_KEY_SIZE,
739 .max_keysize = AES_MAX_KEY_SIZE,
740 .geniv = "eseqiv",
741 .ivsize = AES_BLOCK_SIZE,
742 .setkey = omap_aes_setkey,
743 .encrypt = omap_aes_ctr_encrypt,
744 .decrypt = omap_aes_ctr_decrypt,
745 }
746 } ,
747 };
748
749 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc[] = {
750 {
751 .algs_list = algs_ecb_cbc,
752 .size = ARRAY_SIZE(algs_ecb_cbc),
753 },
754 };
755
756 static struct aead_alg algs_aead_gcm[] = {
757 {
758 .base = {
759 .cra_name = "gcm(aes)",
760 .cra_driver_name = "gcm-aes-omap",
761 .cra_priority = 300,
762 .cra_flags = CRYPTO_ALG_ASYNC |
763 CRYPTO_ALG_KERN_DRIVER_ONLY,
764 .cra_blocksize = 1,
765 .cra_ctxsize = sizeof(struct omap_aes_ctx),
766 .cra_alignmask = 0xf,
767 .cra_module = THIS_MODULE,
768 },
769 .init = omap_aes_gcm_cra_init,
770 .exit = omap_aes_gcm_cra_exit,
771 .ivsize = GCM_AES_IV_SIZE,
772 .maxauthsize = AES_BLOCK_SIZE,
773 .setkey = omap_aes_gcm_setkey,
774 .encrypt = omap_aes_gcm_encrypt,
775 .decrypt = omap_aes_gcm_decrypt,
776 },
777 {
778 .base = {
779 .cra_name = "rfc4106(gcm(aes))",
780 .cra_driver_name = "rfc4106-gcm-aes-omap",
781 .cra_priority = 300,
782 .cra_flags = CRYPTO_ALG_ASYNC |
783 CRYPTO_ALG_KERN_DRIVER_ONLY,
784 .cra_blocksize = 1,
785 .cra_ctxsize = sizeof(struct omap_aes_ctx),
786 .cra_alignmask = 0xf,
787 .cra_module = THIS_MODULE,
788 },
789 .init = omap_aes_gcm_cra_init,
790 .exit = omap_aes_gcm_cra_exit,
791 .maxauthsize = AES_BLOCK_SIZE,
792 .ivsize = GCM_RFC4106_IV_SIZE,
793 .setkey = omap_aes_4106gcm_setkey,
794 .encrypt = omap_aes_4106gcm_encrypt,
795 .decrypt = omap_aes_4106gcm_decrypt,
796 },
797 };
798
799 static struct omap_aes_aead_algs omap_aes_aead_info = {
800 .algs_list = algs_aead_gcm,
801 .size = ARRAY_SIZE(algs_aead_gcm),
802 };
803
804 static const struct omap_aes_pdata omap_aes_pdata_omap2 = {
805 .algs_info = omap_aes_algs_info_ecb_cbc,
806 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc),
807 .trigger = omap_aes_dma_trigger_omap2,
808 .key_ofs = 0x1c,
809 .iv_ofs = 0x20,
810 .ctrl_ofs = 0x30,
811 .data_ofs = 0x34,
812 .rev_ofs = 0x44,
813 .mask_ofs = 0x48,
814 .dma_enable_in = BIT(2),
815 .dma_enable_out = BIT(3),
816 .dma_start = BIT(5),
817 .major_mask = 0xf0,
818 .major_shift = 4,
819 .minor_mask = 0x0f,
820 .minor_shift = 0,
821 };
822
823 #ifdef CONFIG_OF
824 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc_ctr[] = {
825 {
826 .algs_list = algs_ecb_cbc,
827 .size = ARRAY_SIZE(algs_ecb_cbc),
828 },
829 {
830 .algs_list = algs_ctr,
831 .size = ARRAY_SIZE(algs_ctr),
832 },
833 };
834
835 static const struct omap_aes_pdata omap_aes_pdata_omap3 = {
836 .algs_info = omap_aes_algs_info_ecb_cbc_ctr,
837 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
838 .trigger = omap_aes_dma_trigger_omap2,
839 .key_ofs = 0x1c,
840 .iv_ofs = 0x20,
841 .ctrl_ofs = 0x30,
842 .data_ofs = 0x34,
843 .rev_ofs = 0x44,
844 .mask_ofs = 0x48,
845 .dma_enable_in = BIT(2),
846 .dma_enable_out = BIT(3),
847 .dma_start = BIT(5),
848 .major_mask = 0xf0,
849 .major_shift = 4,
850 .minor_mask = 0x0f,
851 .minor_shift = 0,
852 };
853
854 static const struct omap_aes_pdata omap_aes_pdata_omap4 = {
855 .algs_info = omap_aes_algs_info_ecb_cbc_ctr,
856 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
857 .aead_algs_info = &omap_aes_aead_info,
858 .trigger = omap_aes_dma_trigger_omap4,
859 .key_ofs = 0x3c,
860 .iv_ofs = 0x40,
861 .ctrl_ofs = 0x50,
862 .data_ofs = 0x60,
863 .rev_ofs = 0x80,
864 .mask_ofs = 0x84,
865 .irq_status_ofs = 0x8c,
866 .irq_enable_ofs = 0x90,
867 .dma_enable_in = BIT(5),
868 .dma_enable_out = BIT(6),
869 .major_mask = 0x0700,
870 .major_shift = 8,
871 .minor_mask = 0x003f,
872 .minor_shift = 0,
873 };
874
875 static irqreturn_t omap_aes_irq(int irq, void *dev_id)
876 {
877 struct omap_aes_dev *dd = dev_id;
878 u32 status, i;
879 u32 *src, *dst;
880
881 status = omap_aes_read(dd, AES_REG_IRQ_STATUS(dd));
882 if (status & AES_REG_IRQ_DATA_IN) {
883 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
884
885 BUG_ON(!dd->in_sg);
886
887 BUG_ON(_calc_walked(in) > dd->in_sg->length);
888
889 src = sg_virt(dd->in_sg) + _calc_walked(in);
890
891 for (i = 0; i < AES_BLOCK_WORDS; i++) {
892 omap_aes_write(dd, AES_REG_DATA_N(dd, i), *src);
893
894 scatterwalk_advance(&dd->in_walk, 4);
895 if (dd->in_sg->length == _calc_walked(in)) {
896 dd->in_sg = sg_next(dd->in_sg);
897 if (dd->in_sg) {
898 scatterwalk_start(&dd->in_walk,
899 dd->in_sg);
900 src = sg_virt(dd->in_sg) +
901 _calc_walked(in);
902 }
903 } else {
904 src++;
905 }
906 }
907
908 /* Clear IRQ status */
909 status &= ~AES_REG_IRQ_DATA_IN;
910 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
911
912 /* Enable DATA_OUT interrupt */
913 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x4);
914
915 } else if (status & AES_REG_IRQ_DATA_OUT) {
916 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
917
918 BUG_ON(!dd->out_sg);
919
920 BUG_ON(_calc_walked(out) > dd->out_sg->length);
921
922 dst = sg_virt(dd->out_sg) + _calc_walked(out);
923
924 for (i = 0; i < AES_BLOCK_WORDS; i++) {
925 *dst = omap_aes_read(dd, AES_REG_DATA_N(dd, i));
926 scatterwalk_advance(&dd->out_walk, 4);
927 if (dd->out_sg->length == _calc_walked(out)) {
928 dd->out_sg = sg_next(dd->out_sg);
929 if (dd->out_sg) {
930 scatterwalk_start(&dd->out_walk,
931 dd->out_sg);
932 dst = sg_virt(dd->out_sg) +
933 _calc_walked(out);
934 }
935 } else {
936 dst++;
937 }
938 }
939
940 dd->total -= min_t(size_t, AES_BLOCK_SIZE, dd->total);
941
942 /* Clear IRQ status */
943 status &= ~AES_REG_IRQ_DATA_OUT;
944 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
945
946 if (!dd->total)
947 /* All bytes read! */
948 tasklet_schedule(&dd->done_task);
949 else
950 /* Enable DATA_IN interrupt for next block */
951 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
952 }
953
954 return IRQ_HANDLED;
955 }
956
957 static const struct of_device_id omap_aes_of_match[] = {
958 {
959 .compatible = "ti,omap2-aes",
960 .data = &omap_aes_pdata_omap2,
961 },
962 {
963 .compatible = "ti,omap3-aes",
964 .data = &omap_aes_pdata_omap3,
965 },
966 {
967 .compatible = "ti,omap4-aes",
968 .data = &omap_aes_pdata_omap4,
969 },
970 {},
971 };
972 MODULE_DEVICE_TABLE(of, omap_aes_of_match);
973
974 static int omap_aes_get_res_of(struct omap_aes_dev *dd,
975 struct device *dev, struct resource *res)
976 {
977 struct device_node *node = dev->of_node;
978 int err = 0;
979
980 dd->pdata = of_device_get_match_data(dev);
981 if (!dd->pdata) {
982 dev_err(dev, "no compatible OF match\n");
983 err = -EINVAL;
984 goto err;
985 }
986
987 err = of_address_to_resource(node, 0, res);
988 if (err < 0) {
989 dev_err(dev, "can't translate OF node address\n");
990 err = -EINVAL;
991 goto err;
992 }
993
994 err:
995 return err;
996 }
997 #else
998 static const struct of_device_id omap_aes_of_match[] = {
999 {},
1000 };
1001
1002 static int omap_aes_get_res_of(struct omap_aes_dev *dd,
1003 struct device *dev, struct resource *res)
1004 {
1005 return -EINVAL;
1006 }
1007 #endif
1008
1009 static int omap_aes_get_res_pdev(struct omap_aes_dev *dd,
1010 struct platform_device *pdev, struct resource *res)
1011 {
1012 struct device *dev = &pdev->dev;
1013 struct resource *r;
1014 int err = 0;
1015
1016 /* Get the base address */
1017 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1018 if (!r) {
1019 dev_err(dev, "no MEM resource info\n");
1020 err = -ENODEV;
1021 goto err;
1022 }
1023 memcpy(res, r, sizeof(*res));
1024
1025 /* Only OMAP2/3 can be non-DT */
1026 dd->pdata = &omap_aes_pdata_omap2;
1027
1028 err:
1029 return err;
1030 }
1031
1032 static int omap_aes_probe(struct platform_device *pdev)
1033 {
1034 struct device *dev = &pdev->dev;
1035 struct omap_aes_dev *dd;
1036 struct crypto_alg *algp;
1037 struct aead_alg *aalg;
1038 struct resource res;
1039 int err = -ENOMEM, i, j, irq = -1;
1040 u32 reg;
1041
1042 dd = devm_kzalloc(dev, sizeof(struct omap_aes_dev), GFP_KERNEL);
1043 if (dd == NULL) {
1044 dev_err(dev, "unable to alloc data struct.\n");
1045 goto err_data;
1046 }
1047 dd->dev = dev;
1048 platform_set_drvdata(pdev, dd);
1049
1050 aead_init_queue(&dd->aead_queue, OMAP_AES_QUEUE_LENGTH);
1051
1052 err = (dev->of_node) ? omap_aes_get_res_of(dd, dev, &res) :
1053 omap_aes_get_res_pdev(dd, pdev, &res);
1054 if (err)
1055 goto err_res;
1056
1057 dd->io_base = devm_ioremap_resource(dev, &res);
1058 if (IS_ERR(dd->io_base)) {
1059 err = PTR_ERR(dd->io_base);
1060 goto err_res;
1061 }
1062 dd->phys_base = res.start;
1063
1064 pm_runtime_use_autosuspend(dev);
1065 pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY);
1066
1067 pm_runtime_enable(dev);
1068 err = pm_runtime_get_sync(dev);
1069 if (err < 0) {
1070 dev_err(dev, "%s: failed to get_sync(%d)\n",
1071 __func__, err);
1072 goto err_res;
1073 }
1074
1075 omap_aes_dma_stop(dd);
1076
1077 reg = omap_aes_read(dd, AES_REG_REV(dd));
1078
1079 pm_runtime_put_sync(dev);
1080
1081 dev_info(dev, "OMAP AES hw accel rev: %u.%u\n",
1082 (reg & dd->pdata->major_mask) >> dd->pdata->major_shift,
1083 (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
1084
1085 tasklet_init(&dd->done_task, omap_aes_done_task, (unsigned long)dd);
1086
1087 err = omap_aes_dma_init(dd);
1088 if (err == -EPROBE_DEFER) {
1089 goto err_irq;
1090 } else if (err && AES_REG_IRQ_STATUS(dd) && AES_REG_IRQ_ENABLE(dd)) {
1091 dd->pio_only = 1;
1092
1093 irq = platform_get_irq(pdev, 0);
1094 if (irq < 0) {
1095 dev_err(dev, "can't get IRQ resource\n");
1096 err = irq;
1097 goto err_irq;
1098 }
1099
1100 err = devm_request_irq(dev, irq, omap_aes_irq, 0,
1101 dev_name(dev), dd);
1102 if (err) {
1103 dev_err(dev, "Unable to grab omap-aes IRQ\n");
1104 goto err_irq;
1105 }
1106 }
1107
1108 spin_lock_init(&dd->lock);
1109
1110 INIT_LIST_HEAD(&dd->list);
1111 spin_lock(&list_lock);
1112 list_add_tail(&dd->list, &dev_list);
1113 spin_unlock(&list_lock);
1114
1115 /* Initialize crypto engine */
1116 dd->engine = crypto_engine_alloc_init(dev, 1);
1117 if (!dd->engine) {
1118 err = -ENOMEM;
1119 goto err_engine;
1120 }
1121
1122 dd->engine->prepare_cipher_request = omap_aes_prepare_req;
1123 dd->engine->cipher_one_request = omap_aes_crypt_req;
1124 err = crypto_engine_start(dd->engine);
1125 if (err)
1126 goto err_engine;
1127
1128 for (i = 0; i < dd->pdata->algs_info_size; i++) {
1129 if (!dd->pdata->algs_info[i].registered) {
1130 for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
1131 algp = &dd->pdata->algs_info[i].algs_list[j];
1132
1133 pr_debug("reg alg: %s\n", algp->cra_name);
1134 INIT_LIST_HEAD(&algp->cra_list);
1135
1136 err = crypto_register_alg(algp);
1137 if (err)
1138 goto err_algs;
1139
1140 dd->pdata->algs_info[i].registered++;
1141 }
1142 }
1143 }
1144
1145 if (dd->pdata->aead_algs_info &&
1146 !dd->pdata->aead_algs_info->registered) {
1147 for (i = 0; i < dd->pdata->aead_algs_info->size; i++) {
1148 aalg = &dd->pdata->aead_algs_info->algs_list[i];
1149 algp = &aalg->base;
1150
1151 pr_debug("reg alg: %s\n", algp->cra_name);
1152 INIT_LIST_HEAD(&algp->cra_list);
1153
1154 err = crypto_register_aead(aalg);
1155 if (err)
1156 goto err_aead_algs;
1157
1158 dd->pdata->aead_algs_info->registered++;
1159 }
1160 }
1161
1162 return 0;
1163 err_aead_algs:
1164 for (i = dd->pdata->aead_algs_info->registered - 1; i >= 0; i--) {
1165 aalg = &dd->pdata->aead_algs_info->algs_list[i];
1166 crypto_unregister_aead(aalg);
1167 }
1168 err_algs:
1169 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1170 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1171 crypto_unregister_alg(
1172 &dd->pdata->algs_info[i].algs_list[j]);
1173
1174 err_engine:
1175 if (dd->engine)
1176 crypto_engine_exit(dd->engine);
1177
1178 omap_aes_dma_cleanup(dd);
1179 err_irq:
1180 tasklet_kill(&dd->done_task);
1181 pm_runtime_disable(dev);
1182 err_res:
1183 dd = NULL;
1184 err_data:
1185 dev_err(dev, "initialization failed.\n");
1186 return err;
1187 }
1188
1189 static int omap_aes_remove(struct platform_device *pdev)
1190 {
1191 struct omap_aes_dev *dd = platform_get_drvdata(pdev);
1192 struct aead_alg *aalg;
1193 int i, j;
1194
1195 if (!dd)
1196 return -ENODEV;
1197
1198 spin_lock(&list_lock);
1199 list_del(&dd->list);
1200 spin_unlock(&list_lock);
1201
1202 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1203 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1204 crypto_unregister_alg(
1205 &dd->pdata->algs_info[i].algs_list[j]);
1206
1207 for (i = dd->pdata->aead_algs_info->size - 1; i >= 0; i--) {
1208 aalg = &dd->pdata->aead_algs_info->algs_list[i];
1209 crypto_unregister_aead(aalg);
1210 }
1211
1212 crypto_engine_exit(dd->engine);
1213
1214 tasklet_kill(&dd->done_task);
1215 omap_aes_dma_cleanup(dd);
1216 pm_runtime_disable(dd->dev);
1217 dd = NULL;
1218
1219 return 0;
1220 }
1221
1222 #ifdef CONFIG_PM_SLEEP
1223 static int omap_aes_suspend(struct device *dev)
1224 {
1225 pm_runtime_put_sync(dev);
1226 return 0;
1227 }
1228
1229 static int omap_aes_resume(struct device *dev)
1230 {
1231 pm_runtime_get_sync(dev);
1232 return 0;
1233 }
1234 #endif
1235
1236 static SIMPLE_DEV_PM_OPS(omap_aes_pm_ops, omap_aes_suspend, omap_aes_resume);
1237
1238 static struct platform_driver omap_aes_driver = {
1239 .probe = omap_aes_probe,
1240 .remove = omap_aes_remove,
1241 .driver = {
1242 .name = "omap-aes",
1243 .pm = &omap_aes_pm_ops,
1244 .of_match_table = omap_aes_of_match,
1245 },
1246 };
1247
1248 module_platform_driver(omap_aes_driver);
1249
1250 MODULE_DESCRIPTION("OMAP AES hw acceleration support.");
1251 MODULE_LICENSE("GPL v2");
1252 MODULE_AUTHOR("Dmitry Kasatkin");
1253
CRIS linux kernel tree