]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/crypto/omap-aes.c
projects / mirror_ubuntu-artful-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
UBUNTU: Start new release
[mirror_ubuntu-artful-kernel.git] / drivers / crypto / omap-aes.c
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/engine.h>
39 #include <crypto/internal/skcipher.h>
40 #include <crypto/internal/aead.h>
41
42 #include "omap-crypto.h"
43 #include "omap-aes.h"
44
45 /* keep registered devices data here */
46 static LIST_HEAD(dev_list);
47 static DEFINE_SPINLOCK(list_lock);
48
49 #ifdef DEBUG
50 #define omap_aes_read(dd, offset) \
51 ({ \
52 int _read_ret; \
53 _read_ret = __raw_readl(dd->io_base + offset); \
54 pr_debug("omap_aes_read(" #offset "=%#x)= %#x\n", \
55 offset, _read_ret); \
56 _read_ret; \
57 })
58 #else
59 inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset)
60 {
61 return __raw_readl(dd->io_base + offset);
62 }
63 #endif
64
65 #ifdef DEBUG
66 #define omap_aes_write(dd, offset, value) \
67 do { \
68 pr_debug("omap_aes_write(" #offset "=%#x) value=%#x\n", \
69 offset, value); \
70 __raw_writel(value, dd->io_base + offset); \
71 } while (0)
72 #else
73 inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset,
74 u32 value)
75 {
76 __raw_writel(value, dd->io_base + offset);
77 }
78 #endif
79
80 static inline void omap_aes_write_mask(struct omap_aes_dev *dd, u32 offset,
81 u32 value, u32 mask)
82 {
83 u32 val;
84
85 val = omap_aes_read(dd, offset);
86 val &= ~mask;
87 val |= value;
88 omap_aes_write(dd, offset, val);
89 }
90
91 static void omap_aes_write_n(struct omap_aes_dev *dd, u32 offset,
92 u32 *value, int count)
93 {
94 for (; count--; value++, offset += 4)
95 omap_aes_write(dd, offset, *value);
96 }
97
98 static int omap_aes_hw_init(struct omap_aes_dev *dd)
99 {
100 int err;
101
102 if (!(dd->flags & FLAGS_INIT)) {
103 dd->flags |= FLAGS_INIT;
104 dd->err = 0;
105 }
106
107 err = pm_runtime_get_sync(dd->dev);
108 if (err < 0) {
109 dev_err(dd->dev, "failed to get sync: %d\n", err);
110 return err;
111 }
112
113 return 0;
114 }
115
116 void omap_aes_clear_copy_flags(struct omap_aes_dev *dd)
117 {
118 dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_IN_DATA_ST_SHIFT);
119 dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_OUT_DATA_ST_SHIFT);
120 dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_ASSOC_DATA_ST_SHIFT);
121 }
122
123 int omap_aes_write_ctrl(struct omap_aes_dev *dd)
124 {
125 struct omap_aes_reqctx *rctx;
126 unsigned int key32;
127 int i, err;
128 u32 val;
129
130 err = omap_aes_hw_init(dd);
131 if (err)
132 return err;
133
134 key32 = dd->ctx->keylen / sizeof(u32);
135
136 /* RESET the key as previous HASH keys should not get affected*/
137 if (dd->flags & FLAGS_GCM)
138 for (i = 0; i < 0x40; i = i + 4)
139 omap_aes_write(dd, i, 0x0);
140
141 for (i = 0; i < key32; i++) {
142 omap_aes_write(dd, AES_REG_KEY(dd, i),
143 __le32_to_cpu(dd->ctx->key[i]));
144 }
145
146 if ((dd->flags & (FLAGS_CBC | FLAGS_CTR)) && dd->req->info)
147 omap_aes_write_n(dd, AES_REG_IV(dd, 0), dd->req->info, 4);
148
149 if ((dd->flags & (FLAGS_GCM)) && dd->aead_req->iv) {
150 rctx = aead_request_ctx(dd->aead_req);
151 omap_aes_write_n(dd, AES_REG_IV(dd, 0), (u32 *)rctx->iv, 4);
152 }
153
154 val = FLD_VAL(((dd->ctx->keylen >> 3) - 1), 4, 3);
155 if (dd->flags & FLAGS_CBC)
156 val |= AES_REG_CTRL_CBC;
157
158 if (dd->flags & (FLAGS_CTR | FLAGS_GCM))
159 val |= AES_REG_CTRL_CTR | AES_REG_CTRL_CTR_WIDTH_128;
160
161 if (dd->flags & FLAGS_GCM)
162 val |= AES_REG_CTRL_GCM;
163
164 if (dd->flags & FLAGS_ENCRYPT)
165 val |= AES_REG_CTRL_DIRECTION;
166
167 omap_aes_write_mask(dd, AES_REG_CTRL(dd), val, AES_REG_CTRL_MASK);
168
169 return 0;
170 }
171
172 static void omap_aes_dma_trigger_omap2(struct omap_aes_dev *dd, int length)
173 {
174 u32 mask, val;
175
176 val = dd->pdata->dma_start;
177
178 if (dd->dma_lch_out != NULL)
179 val |= dd->pdata->dma_enable_out;
180 if (dd->dma_lch_in != NULL)
181 val |= dd->pdata->dma_enable_in;
182
183 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
184 dd->pdata->dma_start;
185
186 omap_aes_write_mask(dd, AES_REG_MASK(dd), val, mask);
187
188 }
189
190 static void omap_aes_dma_trigger_omap4(struct omap_aes_dev *dd, int length)
191 {
192 omap_aes_write(dd, AES_REG_LENGTH_N(0), length);
193 omap_aes_write(dd, AES_REG_LENGTH_N(1), 0);
194 if (dd->flags & FLAGS_GCM)
195 omap_aes_write(dd, AES_REG_A_LEN, dd->assoc_len);
196
197 omap_aes_dma_trigger_omap2(dd, length);
198 }
199
200 static void omap_aes_dma_stop(struct omap_aes_dev *dd)
201 {
202 u32 mask;
203
204 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
205 dd->pdata->dma_start;
206
207 omap_aes_write_mask(dd, AES_REG_MASK(dd), 0, mask);
208 }
209
210 struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_reqctx *rctx)
211 {
212 struct omap_aes_dev *dd;
213
214 spin_lock_bh(&list_lock);
215 dd = list_first_entry(&dev_list, struct omap_aes_dev, list);
216 list_move_tail(&dd->list, &dev_list);
217 rctx->dd = dd;
218 spin_unlock_bh(&list_lock);
219
220 return dd;
221 }
222
223 static void omap_aes_dma_out_callback(void *data)
224 {
225 struct omap_aes_dev *dd = data;
226
227 /* dma_lch_out - completed */
228 tasklet_schedule(&dd->done_task);
229 }
230
231 static int omap_aes_dma_init(struct omap_aes_dev *dd)
232 {
233 int err;
234
235 dd->dma_lch_out = NULL;
236 dd->dma_lch_in = NULL;
237
238 dd->dma_lch_in = dma_request_chan(dd->dev, "rx");
239 if (IS_ERR(dd->dma_lch_in)) {
240 dev_err(dd->dev, "Unable to request in DMA channel\n");
241 return PTR_ERR(dd->dma_lch_in);
242 }
243
244 dd->dma_lch_out = dma_request_chan(dd->dev, "tx");
245 if (IS_ERR(dd->dma_lch_out)) {
246 dev_err(dd->dev, "Unable to request out DMA channel\n");
247 err = PTR_ERR(dd->dma_lch_out);
248 goto err_dma_out;
249 }
250
251 return 0;
252
253 err_dma_out:
254 dma_release_channel(dd->dma_lch_in);
255
256 return err;
257 }
258
259 static void omap_aes_dma_cleanup(struct omap_aes_dev *dd)
260 {
261 if (dd->pio_only)
262 return;
263
264 dma_release_channel(dd->dma_lch_out);
265 dma_release_channel(dd->dma_lch_in);
266 }
267
268 static int omap_aes_crypt_dma(struct omap_aes_dev *dd,
269 struct scatterlist *in_sg,
270 struct scatterlist *out_sg,
271 int in_sg_len, int out_sg_len)
272 {
273 struct dma_async_tx_descriptor *tx_in, *tx_out;
274 struct dma_slave_config cfg;
275 int ret;
276
277 if (dd->pio_only) {
278 scatterwalk_start(&dd->in_walk, dd->in_sg);
279 scatterwalk_start(&dd->out_walk, dd->out_sg);
280
281 /* Enable DATAIN interrupt and let it take
282 care of the rest */
283 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
284 return 0;
285 }
286
287 dma_sync_sg_for_device(dd->dev, dd->in_sg, in_sg_len, DMA_TO_DEVICE);
288
289 memset(&cfg, 0, sizeof(cfg));
290
291 cfg.src_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
292 cfg.dst_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
293 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
294 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
295 cfg.src_maxburst = DST_MAXBURST;
296 cfg.dst_maxburst = DST_MAXBURST;
297
298 /* IN */
299 ret = dmaengine_slave_config(dd->dma_lch_in, &cfg);
300 if (ret) {
301 dev_err(dd->dev, "can't configure IN dmaengine slave: %d\n",
302 ret);
303 return ret;
304 }
305
306 tx_in = dmaengine_prep_slave_sg(dd->dma_lch_in, in_sg, in_sg_len,
307 DMA_MEM_TO_DEV,
308 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
309 if (!tx_in) {
310 dev_err(dd->dev, "IN prep_slave_sg() failed\n");
311 return -EINVAL;
312 }
313
314 /* No callback necessary */
315 tx_in->callback_param = dd;
316
317 /* OUT */
318 ret = dmaengine_slave_config(dd->dma_lch_out, &cfg);
319 if (ret) {
320 dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n",
321 ret);
322 return ret;
323 }
324
325 tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg, out_sg_len,
326 DMA_DEV_TO_MEM,
327 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
328 if (!tx_out) {
329 dev_err(dd->dev, "OUT prep_slave_sg() failed\n");
330 return -EINVAL;
331 }
332
333 if (dd->flags & FLAGS_GCM)
334 tx_out->callback = omap_aes_gcm_dma_out_callback;
335 else
336 tx_out->callback = omap_aes_dma_out_callback;
337 tx_out->callback_param = dd;
338
339 dmaengine_submit(tx_in);
340 dmaengine_submit(tx_out);
341
342 dma_async_issue_pending(dd->dma_lch_in);
343 dma_async_issue_pending(dd->dma_lch_out);
344
345 /* start DMA */
346 dd->pdata->trigger(dd, dd->total);
347
348 return 0;
349 }
350
351 int omap_aes_crypt_dma_start(struct omap_aes_dev *dd)
352 {
353 int err;
354
355 pr_debug("total: %d\n", dd->total);
356
357 if (!dd->pio_only) {
358 err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len,
359 DMA_TO_DEVICE);
360 if (!err) {
361 dev_err(dd->dev, "dma_map_sg() error\n");
362 return -EINVAL;
363 }
364
365 err = dma_map_sg(dd->dev, dd->out_sg, dd->out_sg_len,
366 DMA_FROM_DEVICE);
367 if (!err) {
368 dev_err(dd->dev, "dma_map_sg() error\n");
369 return -EINVAL;
370 }
371 }
372
373 err = omap_aes_crypt_dma(dd, dd->in_sg, dd->out_sg, dd->in_sg_len,
374 dd->out_sg_len);
375 if (err && !dd->pio_only) {
376 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
377 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
378 DMA_FROM_DEVICE);
379 }
380
381 return err;
382 }
383
384 static void omap_aes_finish_req(struct omap_aes_dev *dd, int err)
385 {
386 struct ablkcipher_request *req = dd->req;
387
388 pr_debug("err: %d\n", err);
389
390 crypto_finalize_cipher_request(dd->engine, req, err);
391
392 pm_runtime_mark_last_busy(dd->dev);
393 pm_runtime_put_autosuspend(dd->dev);
394 }
395
396 int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd)
397 {
398 pr_debug("total: %d\n", dd->total);
399
400 omap_aes_dma_stop(dd);
401
402
403 return 0;
404 }
405
406 static int omap_aes_handle_queue(struct omap_aes_dev *dd,
407 struct ablkcipher_request *req)
408 {
409 if (req)
410 return crypto_transfer_cipher_request_to_engine(dd->engine, req);
411
412 return 0;
413 }
414
415 static int omap_aes_prepare_req(struct crypto_engine *engine,
416 struct ablkcipher_request *req)
417 {
418 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
419 crypto_ablkcipher_reqtfm(req));
420 struct omap_aes_reqctx *rctx = ablkcipher_request_ctx(req);
421 struct omap_aes_dev *dd = rctx->dd;
422 int ret;
423 u16 flags;
424
425 if (!dd)
426 return -ENODEV;
427
428 /* assign new request to device */
429 dd->req = req;
430 dd->total = req->nbytes;
431 dd->total_save = req->nbytes;
432 dd->in_sg = req->src;
433 dd->out_sg = req->dst;
434 dd->orig_out = req->dst;
435
436 flags = OMAP_CRYPTO_COPY_DATA;
437 if (req->src == req->dst)
438 flags |= OMAP_CRYPTO_FORCE_COPY;
439
440 ret = omap_crypto_align_sg(&dd->in_sg, dd->total, AES_BLOCK_SIZE,
441 dd->in_sgl, flags,
442 FLAGS_IN_DATA_ST_SHIFT, &dd->flags);
443 if (ret)
444 return ret;
445
446 ret = omap_crypto_align_sg(&dd->out_sg, dd->total, AES_BLOCK_SIZE,
447 &dd->out_sgl, 0,
448 FLAGS_OUT_DATA_ST_SHIFT, &dd->flags);
449 if (ret)
450 return ret;
451
452 dd->in_sg_len = sg_nents_for_len(dd->in_sg, dd->total);
453 if (dd->in_sg_len < 0)
454 return dd->in_sg_len;
455
456 dd->out_sg_len = sg_nents_for_len(dd->out_sg, dd->total);
457 if (dd->out_sg_len < 0)
458 return dd->out_sg_len;
459
460 rctx->mode &= FLAGS_MODE_MASK;
461 dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
462
463 dd->ctx = ctx;
464 rctx->dd = dd;
465
466 return omap_aes_write_ctrl(dd);
467 }
468
469 static int omap_aes_crypt_req(struct crypto_engine *engine,
470 struct ablkcipher_request *req)
471 {
472 struct omap_aes_reqctx *rctx = ablkcipher_request_ctx(req);
473 struct omap_aes_dev *dd = rctx->dd;
474
475 if (!dd)
476 return -ENODEV;
477
478 return omap_aes_crypt_dma_start(dd);
479 }
480
481 static void omap_aes_done_task(unsigned long data)
482 {
483 struct omap_aes_dev *dd = (struct omap_aes_dev *)data;
484
485 pr_debug("enter done_task\n");
486
487 if (!dd->pio_only) {
488 dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len,
489 DMA_FROM_DEVICE);
490 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
491 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
492 DMA_FROM_DEVICE);
493 omap_aes_crypt_dma_stop(dd);
494 }
495
496 omap_crypto_cleanup(dd->in_sgl, NULL, 0, dd->total_save,
497 FLAGS_IN_DATA_ST_SHIFT, dd->flags);
498
499 omap_crypto_cleanup(&dd->out_sgl, dd->orig_out, 0, dd->total_save,
500 FLAGS_OUT_DATA_ST_SHIFT, dd->flags);
501
502 omap_aes_finish_req(dd, 0);
503
504 pr_debug("exit\n");
505 }
506
507 static int omap_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
508 {
509 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
510 crypto_ablkcipher_reqtfm(req));
511 struct omap_aes_reqctx *rctx = ablkcipher_request_ctx(req);
512 struct omap_aes_dev *dd;
513 int ret;
514
515 pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->nbytes,
516 !!(mode & FLAGS_ENCRYPT),
517 !!(mode & FLAGS_CBC));
518
519 if (req->nbytes < 200) {
520 SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback);
521
522 skcipher_request_set_tfm(subreq, ctx->fallback);
523 skcipher_request_set_callback(subreq, req->base.flags, NULL,
524 NULL);
525 skcipher_request_set_crypt(subreq, req->src, req->dst,
526 req->nbytes, req->info);
527
528 if (mode & FLAGS_ENCRYPT)
529 ret = crypto_skcipher_encrypt(subreq);
530 else
531 ret = crypto_skcipher_decrypt(subreq);
532
533 skcipher_request_zero(subreq);
534 return ret;
535 }
536 dd = omap_aes_find_dev(rctx);
537 if (!dd)
538 return -ENODEV;
539
540 rctx->mode = mode;
541
542 return omap_aes_handle_queue(dd, req);
543 }
544
545 /* ********************** ALG API ************************************ */
546
547 static int omap_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
548 unsigned int keylen)
549 {
550 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
551 int ret;
552
553 if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
554 keylen != AES_KEYSIZE_256)
555 return -EINVAL;
556
557 pr_debug("enter, keylen: %d\n", keylen);
558
559 memcpy(ctx->key, key, keylen);
560 ctx->keylen = keylen;
561
562 crypto_skcipher_clear_flags(ctx->fallback, CRYPTO_TFM_REQ_MASK);
563 crypto_skcipher_set_flags(ctx->fallback, tfm->base.crt_flags &
564 CRYPTO_TFM_REQ_MASK);
565
566 ret = crypto_skcipher_setkey(ctx->fallback, key, keylen);
567 if (!ret)
568 return 0;
569
570 return 0;
571 }
572
573 static int omap_aes_ecb_encrypt(struct ablkcipher_request *req)
574 {
575 return omap_aes_crypt(req, FLAGS_ENCRYPT);
576 }
577
578 static int omap_aes_ecb_decrypt(struct ablkcipher_request *req)
579 {
580 return omap_aes_crypt(req, 0);
581 }
582
583 static int omap_aes_cbc_encrypt(struct ablkcipher_request *req)
584 {
585 return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
586 }
587
588 static int omap_aes_cbc_decrypt(struct ablkcipher_request *req)
589 {
590 return omap_aes_crypt(req, FLAGS_CBC);
591 }
592
593 static int omap_aes_ctr_encrypt(struct ablkcipher_request *req)
594 {
595 return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CTR);
596 }
597
598 static int omap_aes_ctr_decrypt(struct ablkcipher_request *req)
599 {
600 return omap_aes_crypt(req, FLAGS_CTR);
601 }
602
603 static int omap_aes_cra_init(struct crypto_tfm *tfm)
604 {
605 const char *name = crypto_tfm_alg_name(tfm);
606 const u32 flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK;
607 struct omap_aes_ctx *ctx = crypto_tfm_ctx(tfm);
608 struct crypto_skcipher *blk;
609
610 blk = crypto_alloc_skcipher(name, 0, flags);
611 if (IS_ERR(blk))
612 return PTR_ERR(blk);
613
614 ctx->fallback = blk;
615
616 tfm->crt_ablkcipher.reqsize = sizeof(struct omap_aes_reqctx);
617
618 return 0;
619 }
620
621 static int omap_aes_gcm_cra_init(struct crypto_aead *tfm)
622 {
623 struct omap_aes_dev *dd = NULL;
624 struct omap_aes_ctx *ctx = crypto_aead_ctx(tfm);
625 int err;
626
627 /* Find AES device, currently picks the first device */
628 spin_lock_bh(&list_lock);
629 list_for_each_entry(dd, &dev_list, list) {
630 break;
631 }
632 spin_unlock_bh(&list_lock);
633
634 err = pm_runtime_get_sync(dd->dev);
635 if (err < 0) {
636 dev_err(dd->dev, "%s: failed to get_sync(%d)\n",
637 __func__, err);
638 return err;
639 }
640
641 tfm->reqsize = sizeof(struct omap_aes_reqctx);
642 ctx->ctr = crypto_alloc_skcipher("ecb(aes)", 0, 0);
643 if (IS_ERR(ctx->ctr)) {
644 pr_warn("could not load aes driver for encrypting IV\n");
645 return PTR_ERR(ctx->ctr);
646 }
647
648 return 0;
649 }
650
651 static void omap_aes_cra_exit(struct crypto_tfm *tfm)
652 {
653 struct omap_aes_ctx *ctx = crypto_tfm_ctx(tfm);
654
655 if (ctx->fallback)
656 crypto_free_skcipher(ctx->fallback);
657
658 ctx->fallback = NULL;
659 }
660
661 static void omap_aes_gcm_cra_exit(struct crypto_aead *tfm)
662 {
663 struct omap_aes_ctx *ctx = crypto_aead_ctx(tfm);
664
665 omap_aes_cra_exit(crypto_aead_tfm(tfm));
666
667 if (ctx->ctr)
668 crypto_free_skcipher(ctx->ctr);
669 }
670
671 /* ********************** ALGS ************************************ */
672
673 static struct crypto_alg algs_ecb_cbc[] = {
674 {
675 .cra_name = "ecb(aes)",
676 .cra_driver_name = "ecb-aes-omap",
677 .cra_priority = 300,
678 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
679 CRYPTO_ALG_KERN_DRIVER_ONLY |
680 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
681 .cra_blocksize = AES_BLOCK_SIZE,
682 .cra_ctxsize = sizeof(struct omap_aes_ctx),
683 .cra_alignmask = 0,
684 .cra_type = &crypto_ablkcipher_type,
685 .cra_module = THIS_MODULE,
686 .cra_init = omap_aes_cra_init,
687 .cra_exit = omap_aes_cra_exit,
688 .cra_u.ablkcipher = {
689 .min_keysize = AES_MIN_KEY_SIZE,
690 .max_keysize = AES_MAX_KEY_SIZE,
691 .setkey = omap_aes_setkey,
692 .encrypt = omap_aes_ecb_encrypt,
693 .decrypt = omap_aes_ecb_decrypt,
694 }
695 },
696 {
697 .cra_name = "cbc(aes)",
698 .cra_driver_name = "cbc-aes-omap",
699 .cra_priority = 300,
700 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
701 CRYPTO_ALG_KERN_DRIVER_ONLY |
702 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
703 .cra_blocksize = AES_BLOCK_SIZE,
704 .cra_ctxsize = sizeof(struct omap_aes_ctx),
705 .cra_alignmask = 0,
706 .cra_type = &crypto_ablkcipher_type,
707 .cra_module = THIS_MODULE,
708 .cra_init = omap_aes_cra_init,
709 .cra_exit = omap_aes_cra_exit,
710 .cra_u.ablkcipher = {
711 .min_keysize = AES_MIN_KEY_SIZE,
712 .max_keysize = AES_MAX_KEY_SIZE,
713 .ivsize = AES_BLOCK_SIZE,
714 .setkey = omap_aes_setkey,
715 .encrypt = omap_aes_cbc_encrypt,
716 .decrypt = omap_aes_cbc_decrypt,
717 }
718 }
719 };
720
721 static struct crypto_alg algs_ctr[] = {
722 {
723 .cra_name = "ctr(aes)",
724 .cra_driver_name = "ctr-aes-omap",
725 .cra_priority = 300,
726 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
727 CRYPTO_ALG_KERN_DRIVER_ONLY |
728 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
729 .cra_blocksize = AES_BLOCK_SIZE,
730 .cra_ctxsize = sizeof(struct omap_aes_ctx),
731 .cra_alignmask = 0,
732 .cra_type = &crypto_ablkcipher_type,
733 .cra_module = THIS_MODULE,
734 .cra_init = omap_aes_cra_init,
735 .cra_exit = omap_aes_cra_exit,
736 .cra_u.ablkcipher = {
737 .min_keysize = AES_MIN_KEY_SIZE,
738 .max_keysize = AES_MAX_KEY_SIZE,
739 .geniv = "eseqiv",
740 .ivsize = AES_BLOCK_SIZE,
741 .setkey = omap_aes_setkey,
742 .encrypt = omap_aes_ctr_encrypt,
743 .decrypt = omap_aes_ctr_decrypt,
744 }
745 } ,
746 };
747
748 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc[] = {
749 {
750 .algs_list = algs_ecb_cbc,
751 .size = ARRAY_SIZE(algs_ecb_cbc),
752 },
753 };
754
755 static struct aead_alg algs_aead_gcm[] = {
756 {
757 .base = {
758 .cra_name = "gcm(aes)",
759 .cra_driver_name = "gcm-aes-omap",
760 .cra_priority = 300,
761 .cra_flags = CRYPTO_ALG_ASYNC |
762 CRYPTO_ALG_KERN_DRIVER_ONLY,
763 .cra_blocksize = 1,
764 .cra_ctxsize = sizeof(struct omap_aes_ctx),
765 .cra_alignmask = 0xf,
766 .cra_module = THIS_MODULE,
767 },
768 .init = omap_aes_gcm_cra_init,
769 .exit = omap_aes_gcm_cra_exit,
770 .ivsize = 12,
771 .maxauthsize = AES_BLOCK_SIZE,
772 .setkey = omap_aes_gcm_setkey,
773 .encrypt = omap_aes_gcm_encrypt,
774 .decrypt = omap_aes_gcm_decrypt,
775 },
776 {
777 .base = {
778 .cra_name = "rfc4106(gcm(aes))",
779 .cra_driver_name = "rfc4106-gcm-aes-omap",
780 .cra_priority = 300,
781 .cra_flags = CRYPTO_ALG_ASYNC |
782 CRYPTO_ALG_KERN_DRIVER_ONLY,
783 .cra_blocksize = 1,
784 .cra_ctxsize = sizeof(struct omap_aes_ctx),
785 .cra_alignmask = 0xf,
786 .cra_module = THIS_MODULE,
787 },
788 .init = omap_aes_gcm_cra_init,
789 .exit = omap_aes_gcm_cra_exit,
790 .maxauthsize = AES_BLOCK_SIZE,
791 .ivsize = 8,
792 .setkey = omap_aes_4106gcm_setkey,
793 .encrypt = omap_aes_4106gcm_encrypt,
794 .decrypt = omap_aes_4106gcm_decrypt,
795 },
796 };
797
798 static struct omap_aes_aead_algs omap_aes_aead_info = {
799 .algs_list = algs_aead_gcm,
800 .size = ARRAY_SIZE(algs_aead_gcm),
801 };
802
803 static const struct omap_aes_pdata omap_aes_pdata_omap2 = {
804 .algs_info = omap_aes_algs_info_ecb_cbc,
805 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc),
806 .trigger = omap_aes_dma_trigger_omap2,
807 .key_ofs = 0x1c,
808 .iv_ofs = 0x20,
809 .ctrl_ofs = 0x30,
810 .data_ofs = 0x34,
811 .rev_ofs = 0x44,
812 .mask_ofs = 0x48,
813 .dma_enable_in = BIT(2),
814 .dma_enable_out = BIT(3),
815 .dma_start = BIT(5),
816 .major_mask = 0xf0,
817 .major_shift = 4,
818 .minor_mask = 0x0f,
819 .minor_shift = 0,
820 };
821
822 #ifdef CONFIG_OF
823 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc_ctr[] = {
824 {
825 .algs_list = algs_ecb_cbc,
826 .size = ARRAY_SIZE(algs_ecb_cbc),
827 },
828 {
829 .algs_list = algs_ctr,
830 .size = ARRAY_SIZE(algs_ctr),
831 },
832 };
833
834 static const struct omap_aes_pdata omap_aes_pdata_omap3 = {
835 .algs_info = omap_aes_algs_info_ecb_cbc_ctr,
836 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
837 .trigger = omap_aes_dma_trigger_omap2,
838 .key_ofs = 0x1c,
839 .iv_ofs = 0x20,
840 .ctrl_ofs = 0x30,
841 .data_ofs = 0x34,
842 .rev_ofs = 0x44,
843 .mask_ofs = 0x48,
844 .dma_enable_in = BIT(2),
845 .dma_enable_out = BIT(3),
846 .dma_start = BIT(5),
847 .major_mask = 0xf0,
848 .major_shift = 4,
849 .minor_mask = 0x0f,
850 .minor_shift = 0,
851 };
852
853 static const struct omap_aes_pdata omap_aes_pdata_omap4 = {
854 .algs_info = omap_aes_algs_info_ecb_cbc_ctr,
855 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
856 .aead_algs_info = &omap_aes_aead_info,
857 .trigger = omap_aes_dma_trigger_omap4,
858 .key_ofs = 0x3c,
859 .iv_ofs = 0x40,
860 .ctrl_ofs = 0x50,
861 .data_ofs = 0x60,
862 .rev_ofs = 0x80,
863 .mask_ofs = 0x84,
864 .irq_status_ofs = 0x8c,
865 .irq_enable_ofs = 0x90,
866 .dma_enable_in = BIT(5),
867 .dma_enable_out = BIT(6),
868 .major_mask = 0x0700,
869 .major_shift = 8,
870 .minor_mask = 0x003f,
871 .minor_shift = 0,
872 };
873
874 static irqreturn_t omap_aes_irq(int irq, void *dev_id)
875 {
876 struct omap_aes_dev *dd = dev_id;
877 u32 status, i;
878 u32 *src, *dst;
879
880 status = omap_aes_read(dd, AES_REG_IRQ_STATUS(dd));
881 if (status & AES_REG_IRQ_DATA_IN) {
882 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
883
884 BUG_ON(!dd->in_sg);
885
886 BUG_ON(_calc_walked(in) > dd->in_sg->length);
887
888 src = sg_virt(dd->in_sg) + _calc_walked(in);
889
890 for (i = 0; i < AES_BLOCK_WORDS; i++) {
891 omap_aes_write(dd, AES_REG_DATA_N(dd, i), *src);
892
893 scatterwalk_advance(&dd->in_walk, 4);
894 if (dd->in_sg->length == _calc_walked(in)) {
895 dd->in_sg = sg_next(dd->in_sg);
896 if (dd->in_sg) {
897 scatterwalk_start(&dd->in_walk,
898 dd->in_sg);
899 src = sg_virt(dd->in_sg) +
900 _calc_walked(in);
901 }
902 } else {
903 src++;
904 }
905 }
906
907 /* Clear IRQ status */
908 status &= ~AES_REG_IRQ_DATA_IN;
909 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
910
911 /* Enable DATA_OUT interrupt */
912 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x4);
913
914 } else if (status & AES_REG_IRQ_DATA_OUT) {
915 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
916
917 BUG_ON(!dd->out_sg);
918
919 BUG_ON(_calc_walked(out) > dd->out_sg->length);
920
921 dst = sg_virt(dd->out_sg) + _calc_walked(out);
922
923 for (i = 0; i < AES_BLOCK_WORDS; i++) {
924 *dst = omap_aes_read(dd, AES_REG_DATA_N(dd, i));
925 scatterwalk_advance(&dd->out_walk, 4);
926 if (dd->out_sg->length == _calc_walked(out)) {
927 dd->out_sg = sg_next(dd->out_sg);
928 if (dd->out_sg) {
929 scatterwalk_start(&dd->out_walk,
930 dd->out_sg);
931 dst = sg_virt(dd->out_sg) +
932 _calc_walked(out);
933 }
934 } else {
935 dst++;
936 }
937 }
938
939 dd->total -= min_t(size_t, AES_BLOCK_SIZE, dd->total);
940
941 /* Clear IRQ status */
942 status &= ~AES_REG_IRQ_DATA_OUT;
943 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
944
945 if (!dd->total)
946 /* All bytes read! */
947 tasklet_schedule(&dd->done_task);
948 else
949 /* Enable DATA_IN interrupt for next block */
950 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
951 }
952
953 return IRQ_HANDLED;
954 }
955
956 static const struct of_device_id omap_aes_of_match[] = {
957 {
958 .compatible = "ti,omap2-aes",
959 .data = &omap_aes_pdata_omap2,
960 },
961 {
962 .compatible = "ti,omap3-aes",
963 .data = &omap_aes_pdata_omap3,
964 },
965 {
966 .compatible = "ti,omap4-aes",
967 .data = &omap_aes_pdata_omap4,
968 },
969 {},
970 };
971 MODULE_DEVICE_TABLE(of, omap_aes_of_match);
972
973 static int omap_aes_get_res_of(struct omap_aes_dev *dd,
974 struct device *dev, struct resource *res)
975 {
976 struct device_node *node = dev->of_node;
977 const struct of_device_id *match;
978 int err = 0;
979
980 match = of_match_device(of_match_ptr(omap_aes_of_match), dev);
981 if (!match) {
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 dd->pdata = match->data;
995
996 err:
997 return err;
998 }
999 #else
1000 static const struct of_device_id omap_aes_of_match[] = {
1001 {},
1002 };
1003
1004 static int omap_aes_get_res_of(struct omap_aes_dev *dd,
1005 struct device *dev, struct resource *res)
1006 {
1007 return -EINVAL;
1008 }
1009 #endif
1010
1011 static int omap_aes_get_res_pdev(struct omap_aes_dev *dd,
1012 struct platform_device *pdev, struct resource *res)
1013 {
1014 struct device *dev = &pdev->dev;
1015 struct resource *r;
1016 int err = 0;
1017
1018 /* Get the base address */
1019 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1020 if (!r) {
1021 dev_err(dev, "no MEM resource info\n");
1022 err = -ENODEV;
1023 goto err;
1024 }
1025 memcpy(res, r, sizeof(*res));
1026
1027 /* Only OMAP2/3 can be non-DT */
1028 dd->pdata = &omap_aes_pdata_omap2;
1029
1030 err:
1031 return err;
1032 }
1033
1034 static int omap_aes_probe(struct platform_device *pdev)
1035 {
1036 struct device *dev = &pdev->dev;
1037 struct omap_aes_dev *dd;
1038 struct crypto_alg *algp;
1039 struct aead_alg *aalg;
1040 struct resource res;
1041 int err = -ENOMEM, i, j, irq = -1;
1042 u32 reg;
1043
1044 dd = devm_kzalloc(dev, sizeof(struct omap_aes_dev), GFP_KERNEL);
1045 if (dd == NULL) {
1046 dev_err(dev, "unable to alloc data struct.\n");
1047 goto err_data;
1048 }
1049 dd->dev = dev;
1050 platform_set_drvdata(pdev, dd);
1051
1052 aead_init_queue(&dd->aead_queue, OMAP_AES_QUEUE_LENGTH);
1053
1054 err = (dev->of_node) ? omap_aes_get_res_of(dd, dev, &res) :
1055 omap_aes_get_res_pdev(dd, pdev, &res);
1056 if (err)
1057 goto err_res;
1058
1059 dd->io_base = devm_ioremap_resource(dev, &res);
1060 if (IS_ERR(dd->io_base)) {
1061 err = PTR_ERR(dd->io_base);
1062 goto err_res;
1063 }
1064 dd->phys_base = res.start;
1065
1066 pm_runtime_use_autosuspend(dev);
1067 pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY);
1068
1069 pm_runtime_enable(dev);
1070 err = pm_runtime_get_sync(dev);
1071 if (err < 0) {
1072 dev_err(dev, "%s: failed to get_sync(%d)\n",
1073 __func__, err);
1074 goto err_res;
1075 }
1076
1077 omap_aes_dma_stop(dd);
1078
1079 reg = omap_aes_read(dd, AES_REG_REV(dd));
1080
1081 pm_runtime_put_sync(dev);
1082
1083 dev_info(dev, "OMAP AES hw accel rev: %u.%u\n",
1084 (reg & dd->pdata->major_mask) >> dd->pdata->major_shift,
1085 (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
1086
1087 tasklet_init(&dd->done_task, omap_aes_done_task, (unsigned long)dd);
1088
1089 err = omap_aes_dma_init(dd);
1090 if (err == -EPROBE_DEFER) {
1091 goto err_irq;
1092 } else if (err && AES_REG_IRQ_STATUS(dd) && AES_REG_IRQ_ENABLE(dd)) {
1093 dd->pio_only = 1;
1094
1095 irq = platform_get_irq(pdev, 0);
1096 if (irq < 0) {
1097 dev_err(dev, "can't get IRQ resource\n");
1098 goto err_irq;
1099 }
1100
1101 err = devm_request_irq(dev, irq, omap_aes_irq, 0,
1102 dev_name(dev), dd);
1103 if (err) {
1104 dev_err(dev, "Unable to grab omap-aes IRQ\n");
1105 goto err_irq;
1106 }
1107 }
1108
1109 spin_lock_init(&dd->lock);
1110
1111 INIT_LIST_HEAD(&dd->list);
1112 spin_lock(&list_lock);
1113 list_add_tail(&dd->list, &dev_list);
1114 spin_unlock(&list_lock);
1115
1116 /* Initialize crypto engine */
1117 dd->engine = crypto_engine_alloc_init(dev, 1);
1118 if (!dd->engine) {
1119 err = -ENOMEM;
1120 goto err_engine;
1121 }
1122
1123 dd->engine->prepare_cipher_request = omap_aes_prepare_req;
1124 dd->engine->cipher_one_request = omap_aes_crypt_req;
1125 err = crypto_engine_start(dd->engine);
1126 if (err)
1127 goto err_engine;
1128
1129 for (i = 0; i < dd->pdata->algs_info_size; i++) {
1130 if (!dd->pdata->algs_info[i].registered) {
1131 for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
1132 algp = &dd->pdata->algs_info[i].algs_list[j];
1133
1134 pr_debug("reg alg: %s\n", algp->cra_name);
1135 INIT_LIST_HEAD(&algp->cra_list);
1136
1137 err = crypto_register_alg(algp);
1138 if (err)
1139 goto err_algs;
1140
1141 dd->pdata->algs_info[i].registered++;
1142 }
1143 }
1144 }
1145
1146 if (dd->pdata->aead_algs_info &&
1147 !dd->pdata->aead_algs_info->registered) {
1148 for (i = 0; i < dd->pdata->aead_algs_info->size; i++) {
1149 aalg = &dd->pdata->aead_algs_info->algs_list[i];
1150 algp = &aalg->base;
1151
1152 pr_debug("reg alg: %s\n", algp->cra_name);
1153 INIT_LIST_HEAD(&algp->cra_list);
1154
1155 err = crypto_register_aead(aalg);
1156 if (err)
1157 goto err_aead_algs;
1158
1159 dd->pdata->aead_algs_info->registered++;
1160 }
1161 }
1162
1163 return 0;
1164 err_aead_algs:
1165 for (i = dd->pdata->aead_algs_info->registered - 1; i >= 0; i--) {
1166 aalg = &dd->pdata->aead_algs_info->algs_list[i];
1167 crypto_unregister_aead(aalg);
1168 }
1169 err_algs:
1170 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1171 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1172 crypto_unregister_alg(
1173 &dd->pdata->algs_info[i].algs_list[j]);
1174
1175 err_engine:
1176 if (dd->engine)
1177 crypto_engine_exit(dd->engine);
1178
1179 omap_aes_dma_cleanup(dd);
1180 err_irq:
1181 tasklet_kill(&dd->done_task);
1182 pm_runtime_disable(dev);
1183 err_res:
1184 dd = NULL;
1185 err_data:
1186 dev_err(dev, "initialization failed.\n");
1187 return err;
1188 }
1189
1190 static int omap_aes_remove(struct platform_device *pdev)
1191 {
1192 struct omap_aes_dev *dd = platform_get_drvdata(pdev);
1193 struct aead_alg *aalg;
1194 int i, j;
1195
1196 if (!dd)
1197 return -ENODEV;
1198
1199 spin_lock(&list_lock);
1200 list_del(&dd->list);
1201 spin_unlock(&list_lock);
1202
1203 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1204 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1205 crypto_unregister_alg(
1206 &dd->pdata->algs_info[i].algs_list[j]);
1207
1208 for (i = dd->pdata->aead_algs_info->size - 1; i >= 0; i--) {
1209 aalg = &dd->pdata->aead_algs_info->algs_list[i];
1210 crypto_unregister_aead(aalg);
1211 }
1212
1213 crypto_engine_exit(dd->engine);
1214
1215 tasklet_kill(&dd->done_task);
1216 omap_aes_dma_cleanup(dd);
1217 pm_runtime_disable(dd->dev);
1218 dd = NULL;
1219
1220 return 0;
1221 }
1222
1223 #ifdef CONFIG_PM_SLEEP
1224 static int omap_aes_suspend(struct device *dev)
1225 {
1226 pm_runtime_put_sync(dev);
1227 return 0;
1228 }
1229
1230 static int omap_aes_resume(struct device *dev)
1231 {
1232 pm_runtime_get_sync(dev);
1233 return 0;
1234 }
1235 #endif
1236
1237 static SIMPLE_DEV_PM_OPS(omap_aes_pm_ops, omap_aes_suspend, omap_aes_resume);
1238
1239 static struct platform_driver omap_aes_driver = {
1240 .probe = omap_aes_probe,
1241 .remove = omap_aes_remove,
1242 .driver = {
1243 .name = "omap-aes",
1244 .pm = &omap_aes_pm_ops,
1245 .of_match_table = omap_aes_of_match,
1246 },
1247 };
1248
1249 module_platform_driver(omap_aes_driver);
1250
1251 MODULE_DESCRIPTION("OMAP AES hw acceleration support.");
1252 MODULE_LICENSE("GPL v2");
1253 MODULE_AUTHOR("Dmitry Kasatkin");
1254
Ubuntu Artful kernel mirror