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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Cryptographic API.
4 *
5 * Support for OMAP AES HW acceleration.
6 *
7 * Copyright (c) 2010 Nokia Corporation
8 * Author: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
9 * Copyright (c) 2011 Texas Instruments Incorporated
10 */
11
12#define pr_fmt(fmt) "%20s: " fmt, __func__
13#define prn(num) pr_debug(#num "=%d\n", num)
14#define prx(num) pr_debug(#num "=%x\n", num)
15
16#include <linux/err.h>
17#include <linux/module.h>
18#include <linux/init.h>
19#include <linux/errno.h>
20#include <linux/kernel.h>
21#include <linux/platform_device.h>
22#include <linux/scatterlist.h>
23#include <linux/dma-mapping.h>
24#include <linux/dmaengine.h>
25#include <linux/pm_runtime.h>
26#include <linux/of.h>
27#include <linux/of_device.h>
28#include <linux/of_address.h>
29#include <linux/io.h>
30#include <linux/crypto.h>
31#include <linux/interrupt.h>
32#include <crypto/scatterwalk.h>
33#include <crypto/aes.h>
34#include <crypto/gcm.h>
35#include <crypto/engine.h>
36#include <crypto/internal/skcipher.h>
37#include <crypto/internal/aead.h>
38
39#include "omap-crypto.h"
40#include "omap-aes.h"
41
42/* keep registered devices data here */
43static LIST_HEAD(dev_list);
44static DEFINE_SPINLOCK(list_lock);
45
46static int aes_fallback_sz = 200;
47
48#ifdef DEBUG
49#define omap_aes_read(dd, offset) \
50({ \
51 int _read_ret; \
52 _read_ret = __raw_readl(dd->io_base + offset); \
53 pr_debug("omap_aes_read(" #offset "=%#x)= %#x\n", \
54 offset, _read_ret); \
55 _read_ret; \
56})
57#else
58inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset)
59{
60 return __raw_readl(dd->io_base + offset);
61}
62#endif
63
64#ifdef DEBUG
65#define omap_aes_write(dd, offset, value) \
66 do { \
67 pr_debug("omap_aes_write(" #offset "=%#x) value=%#x\n", \
68 offset, value); \
69 __raw_writel(value, dd->io_base + offset); \
70 } while (0)
71#else
72inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset,
73 u32 value)
74{
75 __raw_writel(value, dd->io_base + offset);
76}
77#endif
78
79static inline void omap_aes_write_mask(struct omap_aes_dev *dd, u32 offset,
80 u32 value, u32 mask)
81{
82 u32 val;
83
84 val = omap_aes_read(dd, offset);
85 val &= ~mask;
86 val |= value;
87 omap_aes_write(dd, offset, val);
88}
89
90static void omap_aes_write_n(struct omap_aes_dev *dd, u32 offset,
91 u32 *value, int count)
92{
93 for (; count--; value++, offset += 4)
94 omap_aes_write(dd, offset, *value);
95}
96
97static int omap_aes_hw_init(struct omap_aes_dev *dd)
98{
99 int err;
100
101 if (!(dd->flags & FLAGS_INIT)) {
102 dd->flags |= FLAGS_INIT;
103 dd->err = 0;
104 }
105
106 err = pm_runtime_get_sync(dd->dev);
107 if (err < 0) {
108 dev_err(dd->dev, "failed to get sync: %d\n", err);
109 return err;
110 }
111
112 return 0;
113}
114
115void omap_aes_clear_copy_flags(struct omap_aes_dev *dd)
116{
117 dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_IN_DATA_ST_SHIFT);
118 dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_OUT_DATA_ST_SHIFT);
119 dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_ASSOC_DATA_ST_SHIFT);
120}
121
122int omap_aes_write_ctrl(struct omap_aes_dev *dd)
123{
124 struct omap_aes_reqctx *rctx;
125 unsigned int key32;
126 int i, err;
127 u32 val;
128
129 err = omap_aes_hw_init(dd);
130 if (err)
131 return err;
132
133 key32 = dd->ctx->keylen / sizeof(u32);
134
135 /* RESET the key as previous HASH keys should not get affected*/
136 if (dd->flags & FLAGS_GCM)
137 for (i = 0; i < 0x40; i = i + 4)
138 omap_aes_write(dd, i, 0x0);
139
140 for (i = 0; i < key32; i++) {
141 omap_aes_write(dd, AES_REG_KEY(dd, i),
142 (__force u32)cpu_to_le32(dd->ctx->key[i]));
143 }
144
145 if ((dd->flags & (FLAGS_CBC | FLAGS_CTR)) && dd->req->iv)
146 omap_aes_write_n(dd, AES_REG_IV(dd, 0), (void *)dd->req->iv, 4);
147
148 if ((dd->flags & (FLAGS_GCM)) && dd->aead_req->iv) {
149 rctx = aead_request_ctx(dd->aead_req);
150 omap_aes_write_n(dd, AES_REG_IV(dd, 0), (u32 *)rctx->iv, 4);
151 }
152
153 val = FLD_VAL(((dd->ctx->keylen >> 3) - 1), 4, 3);
154 if (dd->flags & FLAGS_CBC)
155 val |= AES_REG_CTRL_CBC;
156
157 if (dd->flags & (FLAGS_CTR | FLAGS_GCM))
158 val |= AES_REG_CTRL_CTR | AES_REG_CTRL_CTR_WIDTH_128;
159
160 if (dd->flags & FLAGS_GCM)
161 val |= AES_REG_CTRL_GCM;
162
163 if (dd->flags & FLAGS_ENCRYPT)
164 val |= AES_REG_CTRL_DIRECTION;
165
166 omap_aes_write_mask(dd, AES_REG_CTRL(dd), val, AES_REG_CTRL_MASK);
167
168 return 0;
169}
170
171static void omap_aes_dma_trigger_omap2(struct omap_aes_dev *dd, int length)
172{
173 u32 mask, val;
174
175 val = dd->pdata->dma_start;
176
177 if (dd->dma_lch_out != NULL)
178 val |= dd->pdata->dma_enable_out;
179 if (dd->dma_lch_in != NULL)
180 val |= dd->pdata->dma_enable_in;
181
182 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
183 dd->pdata->dma_start;
184
185 omap_aes_write_mask(dd, AES_REG_MASK(dd), val, mask);
186
187}
188
189static void omap_aes_dma_trigger_omap4(struct omap_aes_dev *dd, int length)
190{
191 omap_aes_write(dd, AES_REG_LENGTH_N(0), length);
192 omap_aes_write(dd, AES_REG_LENGTH_N(1), 0);
193 if (dd->flags & FLAGS_GCM)
194 omap_aes_write(dd, AES_REG_A_LEN, dd->assoc_len);
195
196 omap_aes_dma_trigger_omap2(dd, length);
197}
198
199static void omap_aes_dma_stop(struct omap_aes_dev *dd)
200{
201 u32 mask;
202
203 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
204 dd->pdata->dma_start;
205
206 omap_aes_write_mask(dd, AES_REG_MASK(dd), 0, mask);
207}
208
209struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_reqctx *rctx)
210{
211 struct omap_aes_dev *dd;
212
213 spin_lock_bh(&list_lock);
214 dd = list_first_entry(&dev_list, struct omap_aes_dev, list);
215 list_move_tail(&dd->list, &dev_list);
216 rctx->dd = dd;
217 spin_unlock_bh(&list_lock);
218
219 return dd;
220}
221
222static void omap_aes_dma_out_callback(void *data)
223{
224 struct omap_aes_dev *dd = data;
225
226 /* dma_lch_out - completed */
227 tasklet_schedule(&dd->done_task);
228}
229
230static int omap_aes_dma_init(struct omap_aes_dev *dd)
231{
232 int err;
233
234 dd->dma_lch_out = NULL;
235 dd->dma_lch_in = NULL;
236
237 dd->dma_lch_in = dma_request_chan(dd->dev, "rx");
238 if (IS_ERR(dd->dma_lch_in)) {
239 dev_err(dd->dev, "Unable to request in DMA channel\n");
240 return PTR_ERR(dd->dma_lch_in);
241 }
242
243 dd->dma_lch_out = dma_request_chan(dd->dev, "tx");
244 if (IS_ERR(dd->dma_lch_out)) {
245 dev_err(dd->dev, "Unable to request out DMA channel\n");
246 err = PTR_ERR(dd->dma_lch_out);
247 goto err_dma_out;
248 }
249
250 return 0;
251
252err_dma_out:
253 dma_release_channel(dd->dma_lch_in);
254
255 return err;
256}
257
258static void omap_aes_dma_cleanup(struct omap_aes_dev *dd)
259{
260 if (dd->pio_only)
261 return;
262
263 dma_release_channel(dd->dma_lch_out);
264 dma_release_channel(dd->dma_lch_in);
265}
266
267static int omap_aes_crypt_dma(struct omap_aes_dev *dd,
268 struct scatterlist *in_sg,
269 struct scatterlist *out_sg,
270 int in_sg_len, int out_sg_len)
271{
272 struct dma_async_tx_descriptor *tx_in, *tx_out = NULL, *cb_desc;
273 struct dma_slave_config cfg;
274 int ret;
275
276 if (dd->pio_only) {
277 scatterwalk_start(&dd->in_walk, dd->in_sg);
278 if (out_sg_len)
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 tx_in->callback = NULL;
317
318 /* OUT */
319 if (out_sg_len) {
320 ret = dmaengine_slave_config(dd->dma_lch_out, &cfg);
321 if (ret) {
322 dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n",
323 ret);
324 return ret;
325 }
326
327 tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg,
328 out_sg_len,
329 DMA_DEV_TO_MEM,
330 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
331 if (!tx_out) {
332 dev_err(dd->dev, "OUT prep_slave_sg() failed\n");
333 return -EINVAL;
334 }
335
336 cb_desc = tx_out;
337 } else {
338 cb_desc = tx_in;
339 }
340
341 if (dd->flags & FLAGS_GCM)
342 cb_desc->callback = omap_aes_gcm_dma_out_callback;
343 else
344 cb_desc->callback = omap_aes_dma_out_callback;
345 cb_desc->callback_param = dd;
346
347
348 dmaengine_submit(tx_in);
349 if (tx_out)
350 dmaengine_submit(tx_out);
351
352 dma_async_issue_pending(dd->dma_lch_in);
353 if (out_sg_len)
354 dma_async_issue_pending(dd->dma_lch_out);
355
356 /* start DMA */
357 dd->pdata->trigger(dd, dd->total);
358
359 return 0;
360}
361
362int omap_aes_crypt_dma_start(struct omap_aes_dev *dd)
363{
364 int err;
365
366 pr_debug("total: %zu\n", dd->total);
367
368 if (!dd->pio_only) {
369 err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len,
370 DMA_TO_DEVICE);
371 if (!err) {
372 dev_err(dd->dev, "dma_map_sg() error\n");
373 return -EINVAL;
374 }
375
376 if (dd->out_sg_len) {
377 err = dma_map_sg(dd->dev, dd->out_sg, dd->out_sg_len,
378 DMA_FROM_DEVICE);
379 if (!err) {
380 dev_err(dd->dev, "dma_map_sg() error\n");
381 return -EINVAL;
382 }
383 }
384 }
385
386 err = omap_aes_crypt_dma(dd, dd->in_sg, dd->out_sg, dd->in_sg_len,
387 dd->out_sg_len);
388 if (err && !dd->pio_only) {
389 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
390 if (dd->out_sg_len)
391 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
392 DMA_FROM_DEVICE);
393 }
394
395 return err;
396}
397
398static void omap_aes_finish_req(struct omap_aes_dev *dd, int err)
399{
400 struct skcipher_request *req = dd->req;
401
402 pr_debug("err: %d\n", err);
403
404 crypto_finalize_skcipher_request(dd->engine, req, err);
405
406 pm_runtime_mark_last_busy(dd->dev);
407 pm_runtime_put_autosuspend(dd->dev);
408}
409
410int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd)
411{
412 pr_debug("total: %zu\n", dd->total);
413
414 omap_aes_dma_stop(dd);
415
416
417 return 0;
418}
419
420static int omap_aes_handle_queue(struct omap_aes_dev *dd,
421 struct skcipher_request *req)
422{
423 if (req)
424 return crypto_transfer_skcipher_request_to_engine(dd->engine, req);
425
426 return 0;
427}
428
429static int omap_aes_prepare_req(struct crypto_engine *engine,
430 void *areq)
431{
432 struct skcipher_request *req = container_of(areq, struct skcipher_request, base);
433 struct omap_aes_ctx *ctx = crypto_skcipher_ctx(
434 crypto_skcipher_reqtfm(req));
435 struct omap_aes_reqctx *rctx = skcipher_request_ctx(req);
436 struct omap_aes_dev *dd = rctx->dd;
437 int ret;
438 u16 flags;
439
440 if (!dd)
441 return -ENODEV;
442
443 /* assign new request to device */
444 dd->req = req;
445 dd->total = req->cryptlen;
446 dd->total_save = req->cryptlen;
447 dd->in_sg = req->src;
448 dd->out_sg = req->dst;
449 dd->orig_out = req->dst;
450
451 flags = OMAP_CRYPTO_COPY_DATA;
452 if (req->src == req->dst)
453 flags |= OMAP_CRYPTO_FORCE_COPY;
454
455 ret = omap_crypto_align_sg(&dd->in_sg, dd->total, AES_BLOCK_SIZE,
456 dd->in_sgl, flags,
457 FLAGS_IN_DATA_ST_SHIFT, &dd->flags);
458 if (ret)
459 return ret;
460
461 ret = omap_crypto_align_sg(&dd->out_sg, dd->total, AES_BLOCK_SIZE,
462 &dd->out_sgl, 0,
463 FLAGS_OUT_DATA_ST_SHIFT, &dd->flags);
464 if (ret)
465 return ret;
466
467 dd->in_sg_len = sg_nents_for_len(dd->in_sg, dd->total);
468 if (dd->in_sg_len < 0)
469 return dd->in_sg_len;
470
471 dd->out_sg_len = sg_nents_for_len(dd->out_sg, dd->total);
472 if (dd->out_sg_len < 0)
473 return dd->out_sg_len;
474
475 rctx->mode &= FLAGS_MODE_MASK;
476 dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
477
478 dd->ctx = ctx;
479 rctx->dd = dd;
480
481 return omap_aes_write_ctrl(dd);
482}
483
484static int omap_aes_crypt_req(struct crypto_engine *engine,
485 void *areq)
486{
487 struct skcipher_request *req = container_of(areq, struct skcipher_request, base);
488 struct omap_aes_reqctx *rctx = skcipher_request_ctx(req);
489 struct omap_aes_dev *dd = rctx->dd;
490
491 if (!dd)
492 return -ENODEV;
493
494 return omap_aes_crypt_dma_start(dd);
495}
496
497static void omap_aes_copy_ivout(struct omap_aes_dev *dd, u8 *ivbuf)
498{
499 int i;
500
501 for (i = 0; i < 4; i++)
502 ((u32 *)ivbuf)[i] = omap_aes_read(dd, AES_REG_IV(dd, i));
503}
504
505static void omap_aes_done_task(unsigned long data)
506{
507 struct omap_aes_dev *dd = (struct omap_aes_dev *)data;
508
509 pr_debug("enter done_task\n");
510
511 if (!dd->pio_only) {
512 dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len,
513 DMA_FROM_DEVICE);
514 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
515 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
516 DMA_FROM_DEVICE);
517 omap_aes_crypt_dma_stop(dd);
518 }
519
520 omap_crypto_cleanup(dd->in_sg, NULL, 0, dd->total_save,
521 FLAGS_IN_DATA_ST_SHIFT, dd->flags);
522
523 omap_crypto_cleanup(dd->out_sg, dd->orig_out, 0, dd->total_save,
524 FLAGS_OUT_DATA_ST_SHIFT, dd->flags);
525
526 /* Update IV output */
527 if (dd->flags & (FLAGS_CBC | FLAGS_CTR))
528 omap_aes_copy_ivout(dd, dd->req->iv);
529
530 omap_aes_finish_req(dd, 0);
531
532 pr_debug("exit\n");
533}
534
535static int omap_aes_crypt(struct skcipher_request *req, unsigned long mode)
536{
537 struct omap_aes_ctx *ctx = crypto_skcipher_ctx(
538 crypto_skcipher_reqtfm(req));
539 struct omap_aes_reqctx *rctx = skcipher_request_ctx(req);
540 struct omap_aes_dev *dd;
541 int ret;
542
543 if ((req->cryptlen % AES_BLOCK_SIZE) && !(mode & FLAGS_CTR))
544 return -EINVAL;
545
546 pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->cryptlen,
547 !!(mode & FLAGS_ENCRYPT),
548 !!(mode & FLAGS_CBC));
549
550 if (req->cryptlen < aes_fallback_sz) {
551 skcipher_request_set_tfm(&rctx->fallback_req, ctx->fallback);
552 skcipher_request_set_callback(&rctx->fallback_req,
553 req->base.flags,
554 req->base.complete,
555 req->base.data);
556 skcipher_request_set_crypt(&rctx->fallback_req, req->src,
557 req->dst, req->cryptlen, req->iv);
558
559 if (mode & FLAGS_ENCRYPT)
560 ret = crypto_skcipher_encrypt(&rctx->fallback_req);
561 else
562 ret = crypto_skcipher_decrypt(&rctx->fallback_req);
563 return ret;
564 }
565 dd = omap_aes_find_dev(rctx);
566 if (!dd)
567 return -ENODEV;
568
569 rctx->mode = mode;
570
571 return omap_aes_handle_queue(dd, req);
572}
573
574/* ********************** ALG API ************************************ */
575
576static int omap_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
577 unsigned int keylen)
578{
579 struct omap_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
580 int ret;
581
582 if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
583 keylen != AES_KEYSIZE_256)
584 return -EINVAL;
585
586 pr_debug("enter, keylen: %d\n", keylen);
587
588 memcpy(ctx->key, key, keylen);
589 ctx->keylen = keylen;
590
591 crypto_skcipher_clear_flags(ctx->fallback, CRYPTO_TFM_REQ_MASK);
592 crypto_skcipher_set_flags(ctx->fallback, tfm->base.crt_flags &
593 CRYPTO_TFM_REQ_MASK);
594
595 ret = crypto_skcipher_setkey(ctx->fallback, key, keylen);
596 if (!ret)
597 return 0;
598
599 return 0;
600}
601
602static int omap_aes_ecb_encrypt(struct skcipher_request *req)
603{
604 return omap_aes_crypt(req, FLAGS_ENCRYPT);
605}
606
607static int omap_aes_ecb_decrypt(struct skcipher_request *req)
608{
609 return omap_aes_crypt(req, 0);
610}
611
612static int omap_aes_cbc_encrypt(struct skcipher_request *req)
613{
614 return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
615}
616
617static int omap_aes_cbc_decrypt(struct skcipher_request *req)
618{
619 return omap_aes_crypt(req, FLAGS_CBC);
620}
621
622static int omap_aes_ctr_encrypt(struct skcipher_request *req)
623{
624 return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CTR);
625}
626
627static int omap_aes_ctr_decrypt(struct skcipher_request *req)
628{
629 return omap_aes_crypt(req, FLAGS_CTR);
630}
631
632static int omap_aes_prepare_req(struct crypto_engine *engine,
633 void *req);
634static int omap_aes_crypt_req(struct crypto_engine *engine,
635 void *req);
636
637static int omap_aes_init_tfm(struct crypto_skcipher *tfm)
638{
639 const char *name = crypto_tfm_alg_name(&tfm->base);
640 struct omap_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
641 struct crypto_skcipher *blk;
642
643 blk = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
644 if (IS_ERR(blk))
645 return PTR_ERR(blk);
646
647 ctx->fallback = blk;
648
649 crypto_skcipher_set_reqsize(tfm, sizeof(struct omap_aes_reqctx) +
650 crypto_skcipher_reqsize(blk));
651
652 ctx->enginectx.op.prepare_request = omap_aes_prepare_req;
653 ctx->enginectx.op.unprepare_request = NULL;
654 ctx->enginectx.op.do_one_request = omap_aes_crypt_req;
655
656 return 0;
657}
658
659static void omap_aes_exit_tfm(struct crypto_skcipher *tfm)
660{
661 struct omap_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
662
663 if (ctx->fallback)
664 crypto_free_skcipher(ctx->fallback);
665
666 ctx->fallback = NULL;
667}
668
669/* ********************** ALGS ************************************ */
670
671static struct skcipher_alg algs_ecb_cbc[] = {
672{
673 .base.cra_name = "ecb(aes)",
674 .base.cra_driver_name = "ecb-aes-omap",
675 .base.cra_priority = 300,
676 .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |
677 CRYPTO_ALG_ASYNC |
678 CRYPTO_ALG_NEED_FALLBACK,
679 .base.cra_blocksize = AES_BLOCK_SIZE,
680 .base.cra_ctxsize = sizeof(struct omap_aes_ctx),
681 .base.cra_module = THIS_MODULE,
682
683 .min_keysize = AES_MIN_KEY_SIZE,
684 .max_keysize = AES_MAX_KEY_SIZE,
685 .setkey = omap_aes_setkey,
686 .encrypt = omap_aes_ecb_encrypt,
687 .decrypt = omap_aes_ecb_decrypt,
688 .init = omap_aes_init_tfm,
689 .exit = omap_aes_exit_tfm,
690},
691{
692 .base.cra_name = "cbc(aes)",
693 .base.cra_driver_name = "cbc-aes-omap",
694 .base.cra_priority = 300,
695 .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |
696 CRYPTO_ALG_ASYNC |
697 CRYPTO_ALG_NEED_FALLBACK,
698 .base.cra_blocksize = AES_BLOCK_SIZE,
699 .base.cra_ctxsize = sizeof(struct omap_aes_ctx),
700 .base.cra_module = THIS_MODULE,
701
702 .min_keysize = AES_MIN_KEY_SIZE,
703 .max_keysize = AES_MAX_KEY_SIZE,
704 .ivsize = AES_BLOCK_SIZE,
705 .setkey = omap_aes_setkey,
706 .encrypt = omap_aes_cbc_encrypt,
707 .decrypt = omap_aes_cbc_decrypt,
708 .init = omap_aes_init_tfm,
709 .exit = omap_aes_exit_tfm,
710}
711};
712
713static struct skcipher_alg algs_ctr[] = {
714{
715 .base.cra_name = "ctr(aes)",
716 .base.cra_driver_name = "ctr-aes-omap",
717 .base.cra_priority = 300,
718 .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |
719 CRYPTO_ALG_ASYNC |
720 CRYPTO_ALG_NEED_FALLBACK,
721 .base.cra_blocksize = 1,
722 .base.cra_ctxsize = sizeof(struct omap_aes_ctx),
723 .base.cra_module = THIS_MODULE,
724
725 .min_keysize = AES_MIN_KEY_SIZE,
726 .max_keysize = AES_MAX_KEY_SIZE,
727 .ivsize = AES_BLOCK_SIZE,
728 .setkey = omap_aes_setkey,
729 .encrypt = omap_aes_ctr_encrypt,
730 .decrypt = omap_aes_ctr_decrypt,
731 .init = omap_aes_init_tfm,
732 .exit = omap_aes_exit_tfm,
733}
734};
735
736static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc[] = {
737 {
738 .algs_list = algs_ecb_cbc,
739 .size = ARRAY_SIZE(algs_ecb_cbc),
740 },
741};
742
743static struct aead_alg algs_aead_gcm[] = {
744{
745 .base = {
746 .cra_name = "gcm(aes)",
747 .cra_driver_name = "gcm-aes-omap",
748 .cra_priority = 300,
749 .cra_flags = CRYPTO_ALG_ASYNC |
750 CRYPTO_ALG_KERN_DRIVER_ONLY,
751 .cra_blocksize = 1,
752 .cra_ctxsize = sizeof(struct omap_aes_gcm_ctx),
753 .cra_alignmask = 0xf,
754 .cra_module = THIS_MODULE,
755 },
756 .init = omap_aes_gcm_cra_init,
757 .ivsize = GCM_AES_IV_SIZE,
758 .maxauthsize = AES_BLOCK_SIZE,
759 .setkey = omap_aes_gcm_setkey,
760 .setauthsize = omap_aes_gcm_setauthsize,
761 .encrypt = omap_aes_gcm_encrypt,
762 .decrypt = omap_aes_gcm_decrypt,
763},
764{
765 .base = {
766 .cra_name = "rfc4106(gcm(aes))",
767 .cra_driver_name = "rfc4106-gcm-aes-omap",
768 .cra_priority = 300,
769 .cra_flags = CRYPTO_ALG_ASYNC |
770 CRYPTO_ALG_KERN_DRIVER_ONLY,
771 .cra_blocksize = 1,
772 .cra_ctxsize = sizeof(struct omap_aes_gcm_ctx),
773 .cra_alignmask = 0xf,
774 .cra_module = THIS_MODULE,
775 },
776 .init = omap_aes_gcm_cra_init,
777 .maxauthsize = AES_BLOCK_SIZE,
778 .ivsize = GCM_RFC4106_IV_SIZE,
779 .setkey = omap_aes_4106gcm_setkey,
780 .setauthsize = omap_aes_4106gcm_setauthsize,
781 .encrypt = omap_aes_4106gcm_encrypt,
782 .decrypt = omap_aes_4106gcm_decrypt,
783},
784};
785
786static struct omap_aes_aead_algs omap_aes_aead_info = {
787 .algs_list = algs_aead_gcm,
788 .size = ARRAY_SIZE(algs_aead_gcm),
789};
790
791static const struct omap_aes_pdata omap_aes_pdata_omap2 = {
792 .algs_info = omap_aes_algs_info_ecb_cbc,
793 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc),
794 .trigger = omap_aes_dma_trigger_omap2,
795 .key_ofs = 0x1c,
796 .iv_ofs = 0x20,
797 .ctrl_ofs = 0x30,
798 .data_ofs = 0x34,
799 .rev_ofs = 0x44,
800 .mask_ofs = 0x48,
801 .dma_enable_in = BIT(2),
802 .dma_enable_out = BIT(3),
803 .dma_start = BIT(5),
804 .major_mask = 0xf0,
805 .major_shift = 4,
806 .minor_mask = 0x0f,
807 .minor_shift = 0,
808};
809
810#ifdef CONFIG_OF
811static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc_ctr[] = {
812 {
813 .algs_list = algs_ecb_cbc,
814 .size = ARRAY_SIZE(algs_ecb_cbc),
815 },
816 {
817 .algs_list = algs_ctr,
818 .size = ARRAY_SIZE(algs_ctr),
819 },
820};
821
822static const struct omap_aes_pdata omap_aes_pdata_omap3 = {
823 .algs_info = omap_aes_algs_info_ecb_cbc_ctr,
824 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
825 .trigger = omap_aes_dma_trigger_omap2,
826 .key_ofs = 0x1c,
827 .iv_ofs = 0x20,
828 .ctrl_ofs = 0x30,
829 .data_ofs = 0x34,
830 .rev_ofs = 0x44,
831 .mask_ofs = 0x48,
832 .dma_enable_in = BIT(2),
833 .dma_enable_out = BIT(3),
834 .dma_start = BIT(5),
835 .major_mask = 0xf0,
836 .major_shift = 4,
837 .minor_mask = 0x0f,
838 .minor_shift = 0,
839};
840
841static const struct omap_aes_pdata omap_aes_pdata_omap4 = {
842 .algs_info = omap_aes_algs_info_ecb_cbc_ctr,
843 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
844 .aead_algs_info = &omap_aes_aead_info,
845 .trigger = omap_aes_dma_trigger_omap4,
846 .key_ofs = 0x3c,
847 .iv_ofs = 0x40,
848 .ctrl_ofs = 0x50,
849 .data_ofs = 0x60,
850 .rev_ofs = 0x80,
851 .mask_ofs = 0x84,
852 .irq_status_ofs = 0x8c,
853 .irq_enable_ofs = 0x90,
854 .dma_enable_in = BIT(5),
855 .dma_enable_out = BIT(6),
856 .major_mask = 0x0700,
857 .major_shift = 8,
858 .minor_mask = 0x003f,
859 .minor_shift = 0,
860};
861
862static irqreturn_t omap_aes_irq(int irq, void *dev_id)
863{
864 struct omap_aes_dev *dd = dev_id;
865 u32 status, i;
866 u32 *src, *dst;
867
868 status = omap_aes_read(dd, AES_REG_IRQ_STATUS(dd));
869 if (status & AES_REG_IRQ_DATA_IN) {
870 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
871
872 BUG_ON(!dd->in_sg);
873
874 BUG_ON(_calc_walked(in) > dd->in_sg->length);
875
876 src = sg_virt(dd->in_sg) + _calc_walked(in);
877
878 for (i = 0; i < AES_BLOCK_WORDS; i++) {
879 omap_aes_write(dd, AES_REG_DATA_N(dd, i), *src);
880
881 scatterwalk_advance(&dd->in_walk, 4);
882 if (dd->in_sg->length == _calc_walked(in)) {
883 dd->in_sg = sg_next(dd->in_sg);
884 if (dd->in_sg) {
885 scatterwalk_start(&dd->in_walk,
886 dd->in_sg);
887 src = sg_virt(dd->in_sg) +
888 _calc_walked(in);
889 }
890 } else {
891 src++;
892 }
893 }
894
895 /* Clear IRQ status */
896 status &= ~AES_REG_IRQ_DATA_IN;
897 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
898
899 /* Enable DATA_OUT interrupt */
900 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x4);
901
902 } else if (status & AES_REG_IRQ_DATA_OUT) {
903 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
904
905 BUG_ON(!dd->out_sg);
906
907 BUG_ON(_calc_walked(out) > dd->out_sg->length);
908
909 dst = sg_virt(dd->out_sg) + _calc_walked(out);
910
911 for (i = 0; i < AES_BLOCK_WORDS; i++) {
912 *dst = omap_aes_read(dd, AES_REG_DATA_N(dd, i));
913 scatterwalk_advance(&dd->out_walk, 4);
914 if (dd->out_sg->length == _calc_walked(out)) {
915 dd->out_sg = sg_next(dd->out_sg);
916 if (dd->out_sg) {
917 scatterwalk_start(&dd->out_walk,
918 dd->out_sg);
919 dst = sg_virt(dd->out_sg) +
920 _calc_walked(out);
921 }
922 } else {
923 dst++;
924 }
925 }
926
927 dd->total -= min_t(size_t, AES_BLOCK_SIZE, dd->total);
928
929 /* Clear IRQ status */
930 status &= ~AES_REG_IRQ_DATA_OUT;
931 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
932
933 if (!dd->total)
934 /* All bytes read! */
935 tasklet_schedule(&dd->done_task);
936 else
937 /* Enable DATA_IN interrupt for next block */
938 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
939 }
940
941 return IRQ_HANDLED;
942}
943
944static const struct of_device_id omap_aes_of_match[] = {
945 {
946 .compatible = "ti,omap2-aes",
947 .data = &omap_aes_pdata_omap2,
948 },
949 {
950 .compatible = "ti,omap3-aes",
951 .data = &omap_aes_pdata_omap3,
952 },
953 {
954 .compatible = "ti,omap4-aes",
955 .data = &omap_aes_pdata_omap4,
956 },
957 {},
958};
959MODULE_DEVICE_TABLE(of, omap_aes_of_match);
960
961static int omap_aes_get_res_of(struct omap_aes_dev *dd,
962 struct device *dev, struct resource *res)
963{
964 struct device_node *node = dev->of_node;
965 int err = 0;
966
967 dd->pdata = of_device_get_match_data(dev);
968 if (!dd->pdata) {
969 dev_err(dev, "no compatible OF match\n");
970 err = -EINVAL;
971 goto err;
972 }
973
974 err = of_address_to_resource(node, 0, res);
975 if (err < 0) {
976 dev_err(dev, "can't translate OF node address\n");
977 err = -EINVAL;
978 goto err;
979 }
980
981err:
982 return err;
983}
984#else
985static const struct of_device_id omap_aes_of_match[] = {
986 {},
987};
988
989static int omap_aes_get_res_of(struct omap_aes_dev *dd,
990 struct device *dev, struct resource *res)
991{
992 return -EINVAL;
993}
994#endif
995
996static int omap_aes_get_res_pdev(struct omap_aes_dev *dd,
997 struct platform_device *pdev, struct resource *res)
998{
999 struct device *dev = &pdev->dev;
1000 struct resource *r;
1001 int err = 0;
1002
1003 /* Get the base address */
1004 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1005 if (!r) {
1006 dev_err(dev, "no MEM resource info\n");
1007 err = -ENODEV;
1008 goto err;
1009 }
1010 memcpy(res, r, sizeof(*res));
1011
1012 /* Only OMAP2/3 can be non-DT */
1013 dd->pdata = &omap_aes_pdata_omap2;
1014
1015err:
1016 return err;
1017}
1018
1019static ssize_t fallback_show(struct device *dev, struct device_attribute *attr,
1020 char *buf)
1021{
1022 return sprintf(buf, "%d\n", aes_fallback_sz);
1023}
1024
1025static ssize_t fallback_store(struct device *dev, struct device_attribute *attr,
1026 const char *buf, size_t size)
1027{
1028 ssize_t status;
1029 long value;
1030
1031 status = kstrtol(buf, 0, &value);
1032 if (status)
1033 return status;
1034
1035 /* HW accelerator only works with buffers > 9 */
1036 if (value < 9) {
1037 dev_err(dev, "minimum fallback size 9\n");
1038 return -EINVAL;
1039 }
1040
1041 aes_fallback_sz = value;
1042
1043 return size;
1044}
1045
1046static ssize_t queue_len_show(struct device *dev, struct device_attribute *attr,
1047 char *buf)
1048{
1049 struct omap_aes_dev *dd = dev_get_drvdata(dev);
1050
1051 return sprintf(buf, "%d\n", dd->engine->queue.max_qlen);
1052}
1053
1054static ssize_t queue_len_store(struct device *dev,
1055 struct device_attribute *attr, const char *buf,
1056 size_t size)
1057{
1058 struct omap_aes_dev *dd;
1059 ssize_t status;
1060 long value;
1061 unsigned long flags;
1062
1063 status = kstrtol(buf, 0, &value);
1064 if (status)
1065 return status;
1066
1067 if (value < 1)
1068 return -EINVAL;
1069
1070 /*
1071 * Changing the queue size in fly is safe, if size becomes smaller
1072 * than current size, it will just not accept new entries until
1073 * it has shrank enough.
1074 */
1075 spin_lock_bh(&list_lock);
1076 list_for_each_entry(dd, &dev_list, list) {
1077 spin_lock_irqsave(&dd->lock, flags);
1078 dd->engine->queue.max_qlen = value;
1079 dd->aead_queue.base.max_qlen = value;
1080 spin_unlock_irqrestore(&dd->lock, flags);
1081 }
1082 spin_unlock_bh(&list_lock);
1083
1084 return size;
1085}
1086
1087static DEVICE_ATTR_RW(queue_len);
1088static DEVICE_ATTR_RW(fallback);
1089
1090static struct attribute *omap_aes_attrs[] = {
1091 &dev_attr_queue_len.attr,
1092 &dev_attr_fallback.attr,
1093 NULL,
1094};
1095
1096static struct attribute_group omap_aes_attr_group = {
1097 .attrs = omap_aes_attrs,
1098};
1099
1100static int omap_aes_probe(struct platform_device *pdev)
1101{
1102 struct device *dev = &pdev->dev;
1103 struct omap_aes_dev *dd;
1104 struct skcipher_alg *algp;
1105 struct aead_alg *aalg;
1106 struct resource res;
1107 int err = -ENOMEM, i, j, irq = -1;
1108 u32 reg;
1109
1110 dd = devm_kzalloc(dev, sizeof(struct omap_aes_dev), GFP_KERNEL);
1111 if (dd == NULL) {
1112 dev_err(dev, "unable to alloc data struct.\n");
1113 goto err_data;
1114 }
1115 dd->dev = dev;
1116 platform_set_drvdata(pdev, dd);
1117
1118 aead_init_queue(&dd->aead_queue, OMAP_AES_QUEUE_LENGTH);
1119
1120 err = (dev->of_node) ? omap_aes_get_res_of(dd, dev, &res) :
1121 omap_aes_get_res_pdev(dd, pdev, &res);
1122 if (err)
1123 goto err_res;
1124
1125 dd->io_base = devm_ioremap_resource(dev, &res);
1126 if (IS_ERR(dd->io_base)) {
1127 err = PTR_ERR(dd->io_base);
1128 goto err_res;
1129 }
1130 dd->phys_base = res.start;
1131
1132 pm_runtime_use_autosuspend(dev);
1133 pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY);
1134
1135 pm_runtime_enable(dev);
1136 err = pm_runtime_get_sync(dev);
1137 if (err < 0) {
1138 dev_err(dev, "%s: failed to get_sync(%d)\n",
1139 __func__, err);
1140 goto err_res;
1141 }
1142
1143 omap_aes_dma_stop(dd);
1144
1145 reg = omap_aes_read(dd, AES_REG_REV(dd));
1146
1147 pm_runtime_put_sync(dev);
1148
1149 dev_info(dev, "OMAP AES hw accel rev: %u.%u\n",
1150 (reg & dd->pdata->major_mask) >> dd->pdata->major_shift,
1151 (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
1152
1153 tasklet_init(&dd->done_task, omap_aes_done_task, (unsigned long)dd);
1154
1155 err = omap_aes_dma_init(dd);
1156 if (err == -EPROBE_DEFER) {
1157 goto err_irq;
1158 } else if (err && AES_REG_IRQ_STATUS(dd) && AES_REG_IRQ_ENABLE(dd)) {
1159 dd->pio_only = 1;
1160
1161 irq = platform_get_irq(pdev, 0);
1162 if (irq < 0) {
1163 err = irq;
1164 goto err_irq;
1165 }
1166
1167 err = devm_request_irq(dev, irq, omap_aes_irq, 0,
1168 dev_name(dev), dd);
1169 if (err) {
1170 dev_err(dev, "Unable to grab omap-aes IRQ\n");
1171 goto err_irq;
1172 }
1173 }
1174
1175 spin_lock_init(&dd->lock);
1176
1177 INIT_LIST_HEAD(&dd->list);
1178 spin_lock(&list_lock);
1179 list_add_tail(&dd->list, &dev_list);
1180 spin_unlock(&list_lock);
1181
1182 /* Initialize crypto engine */
1183 dd->engine = crypto_engine_alloc_init(dev, 1);
1184 if (!dd->engine) {
1185 err = -ENOMEM;
1186 goto err_engine;
1187 }
1188
1189 err = crypto_engine_start(dd->engine);
1190 if (err)
1191 goto err_engine;
1192
1193 for (i = 0; i < dd->pdata->algs_info_size; i++) {
1194 if (!dd->pdata->algs_info[i].registered) {
1195 for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
1196 algp = &dd->pdata->algs_info[i].algs_list[j];
1197
1198 pr_debug("reg alg: %s\n", algp->base.cra_name);
1199
1200 err = crypto_register_skcipher(algp);
1201 if (err)
1202 goto err_algs;
1203
1204 dd->pdata->algs_info[i].registered++;
1205 }
1206 }
1207 }
1208
1209 if (dd->pdata->aead_algs_info &&
1210 !dd->pdata->aead_algs_info->registered) {
1211 for (i = 0; i < dd->pdata->aead_algs_info->size; i++) {
1212 aalg = &dd->pdata->aead_algs_info->algs_list[i];
1213
1214 pr_debug("reg alg: %s\n", aalg->base.cra_name);
1215
1216 err = crypto_register_aead(aalg);
1217 if (err)
1218 goto err_aead_algs;
1219
1220 dd->pdata->aead_algs_info->registered++;
1221 }
1222 }
1223
1224 err = sysfs_create_group(&dev->kobj, &omap_aes_attr_group);
1225 if (err) {
1226 dev_err(dev, "could not create sysfs device attrs\n");
1227 goto err_aead_algs;
1228 }
1229
1230 return 0;
1231err_aead_algs:
1232 for (i = dd->pdata->aead_algs_info->registered - 1; i >= 0; i--) {
1233 aalg = &dd->pdata->aead_algs_info->algs_list[i];
1234 crypto_unregister_aead(aalg);
1235 }
1236err_algs:
1237 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1238 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1239 crypto_unregister_skcipher(
1240 &dd->pdata->algs_info[i].algs_list[j]);
1241
1242err_engine:
1243 if (dd->engine)
1244 crypto_engine_exit(dd->engine);
1245
1246 omap_aes_dma_cleanup(dd);
1247err_irq:
1248 tasklet_kill(&dd->done_task);
1249 pm_runtime_disable(dev);
1250err_res:
1251 dd = NULL;
1252err_data:
1253 dev_err(dev, "initialization failed.\n");
1254 return err;
1255}
1256
1257static int omap_aes_remove(struct platform_device *pdev)
1258{
1259 struct omap_aes_dev *dd = platform_get_drvdata(pdev);
1260 struct aead_alg *aalg;
1261 int i, j;
1262
1263 if (!dd)
1264 return -ENODEV;
1265
1266 spin_lock(&list_lock);
1267 list_del(&dd->list);
1268 spin_unlock(&list_lock);
1269
1270 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1271 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--) {
1272 crypto_unregister_skcipher(
1273 &dd->pdata->algs_info[i].algs_list[j]);
1274 dd->pdata->algs_info[i].registered--;
1275 }
1276
1277 for (i = dd->pdata->aead_algs_info->registered - 1; i >= 0; i--) {
1278 aalg = &dd->pdata->aead_algs_info->algs_list[i];
1279 crypto_unregister_aead(aalg);
1280 dd->pdata->aead_algs_info->registered--;
1281
1282 }
1283
1284 crypto_engine_exit(dd->engine);
1285
1286 tasklet_kill(&dd->done_task);
1287 omap_aes_dma_cleanup(dd);
1288 pm_runtime_disable(dd->dev);
1289
1290 sysfs_remove_group(&dd->dev->kobj, &omap_aes_attr_group);
1291
1292 return 0;
1293}
1294
1295#ifdef CONFIG_PM_SLEEP
1296static int omap_aes_suspend(struct device *dev)
1297{
1298 pm_runtime_put_sync(dev);
1299 return 0;
1300}
1301
1302static int omap_aes_resume(struct device *dev)
1303{
1304 pm_runtime_get_sync(dev);
1305 return 0;
1306}
1307#endif
1308
1309static SIMPLE_DEV_PM_OPS(omap_aes_pm_ops, omap_aes_suspend, omap_aes_resume);
1310
1311static struct platform_driver omap_aes_driver = {
1312 .probe = omap_aes_probe,
1313 .remove = omap_aes_remove,
1314 .driver = {
1315 .name = "omap-aes",
1316 .pm = &omap_aes_pm_ops,
1317 .of_match_table = omap_aes_of_match,
1318 },
1319};
1320
1321module_platform_driver(omap_aes_driver);
1322
1323MODULE_DESCRIPTION("OMAP AES hw acceleration support.");
1324MODULE_LICENSE("GPL v2");
1325MODULE_AUTHOR("Dmitry Kasatkin");
1326
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 */
47static LIST_HEAD(dev_list);
48static DEFINE_SPINLOCK(list_lock);
49
50static int aes_fallback_sz = 200;
51
52#ifdef DEBUG
53#define omap_aes_read(dd, offset) \
54({ \
55 int _read_ret; \
56 _read_ret = __raw_readl(dd->io_base + offset); \
57 pr_debug("omap_aes_read(" #offset "=%#x)= %#x\n", \
58 offset, _read_ret); \
59 _read_ret; \
60})
61#else
62inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset)
63{
64 return __raw_readl(dd->io_base + offset);
65}
66#endif
67
68#ifdef DEBUG
69#define omap_aes_write(dd, offset, value) \
70 do { \
71 pr_debug("omap_aes_write(" #offset "=%#x) value=%#x\n", \
72 offset, value); \
73 __raw_writel(value, dd->io_base + offset); \
74 } while (0)
75#else
76inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset,
77 u32 value)
78{
79 __raw_writel(value, dd->io_base + offset);
80}
81#endif
82
83static inline void omap_aes_write_mask(struct omap_aes_dev *dd, u32 offset,
84 u32 value, u32 mask)
85{
86 u32 val;
87
88 val = omap_aes_read(dd, offset);
89 val &= ~mask;
90 val |= value;
91 omap_aes_write(dd, offset, val);
92}
93
94static void omap_aes_write_n(struct omap_aes_dev *dd, u32 offset,
95 u32 *value, int count)
96{
97 for (; count--; value++, offset += 4)
98 omap_aes_write(dd, offset, *value);
99}
100
101static int omap_aes_hw_init(struct omap_aes_dev *dd)
102{
103 int err;
104
105 if (!(dd->flags & FLAGS_INIT)) {
106 dd->flags |= FLAGS_INIT;
107 dd->err = 0;
108 }
109
110 err = pm_runtime_get_sync(dd->dev);
111 if (err < 0) {
112 dev_err(dd->dev, "failed to get sync: %d\n", err);
113 return err;
114 }
115
116 return 0;
117}
118
119void omap_aes_clear_copy_flags(struct omap_aes_dev *dd)
120{
121 dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_IN_DATA_ST_SHIFT);
122 dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_OUT_DATA_ST_SHIFT);
123 dd->flags &= ~(OMAP_CRYPTO_COPY_MASK << FLAGS_ASSOC_DATA_ST_SHIFT);
124}
125
126int omap_aes_write_ctrl(struct omap_aes_dev *dd)
127{
128 struct omap_aes_reqctx *rctx;
129 unsigned int key32;
130 int i, err;
131 u32 val;
132
133 err = omap_aes_hw_init(dd);
134 if (err)
135 return err;
136
137 key32 = dd->ctx->keylen / sizeof(u32);
138
139 /* RESET the key as previous HASH keys should not get affected*/
140 if (dd->flags & FLAGS_GCM)
141 for (i = 0; i < 0x40; i = i + 4)
142 omap_aes_write(dd, i, 0x0);
143
144 for (i = 0; i < key32; i++) {
145 omap_aes_write(dd, AES_REG_KEY(dd, i),
146 __le32_to_cpu(dd->ctx->key[i]));
147 }
148
149 if ((dd->flags & (FLAGS_CBC | FLAGS_CTR)) && dd->req->info)
150 omap_aes_write_n(dd, AES_REG_IV(dd, 0), dd->req->info, 4);
151
152 if ((dd->flags & (FLAGS_GCM)) && dd->aead_req->iv) {
153 rctx = aead_request_ctx(dd->aead_req);
154 omap_aes_write_n(dd, AES_REG_IV(dd, 0), (u32 *)rctx->iv, 4);
155 }
156
157 val = FLD_VAL(((dd->ctx->keylen >> 3) - 1), 4, 3);
158 if (dd->flags & FLAGS_CBC)
159 val |= AES_REG_CTRL_CBC;
160
161 if (dd->flags & (FLAGS_CTR | FLAGS_GCM))
162 val |= AES_REG_CTRL_CTR | AES_REG_CTRL_CTR_WIDTH_128;
163
164 if (dd->flags & FLAGS_GCM)
165 val |= AES_REG_CTRL_GCM;
166
167 if (dd->flags & FLAGS_ENCRYPT)
168 val |= AES_REG_CTRL_DIRECTION;
169
170 omap_aes_write_mask(dd, AES_REG_CTRL(dd), val, AES_REG_CTRL_MASK);
171
172 return 0;
173}
174
175static void omap_aes_dma_trigger_omap2(struct omap_aes_dev *dd, int length)
176{
177 u32 mask, val;
178
179 val = dd->pdata->dma_start;
180
181 if (dd->dma_lch_out != NULL)
182 val |= dd->pdata->dma_enable_out;
183 if (dd->dma_lch_in != NULL)
184 val |= dd->pdata->dma_enable_in;
185
186 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
187 dd->pdata->dma_start;
188
189 omap_aes_write_mask(dd, AES_REG_MASK(dd), val, mask);
190
191}
192
193static void omap_aes_dma_trigger_omap4(struct omap_aes_dev *dd, int length)
194{
195 omap_aes_write(dd, AES_REG_LENGTH_N(0), length);
196 omap_aes_write(dd, AES_REG_LENGTH_N(1), 0);
197 if (dd->flags & FLAGS_GCM)
198 omap_aes_write(dd, AES_REG_A_LEN, dd->assoc_len);
199
200 omap_aes_dma_trigger_omap2(dd, length);
201}
202
203static void omap_aes_dma_stop(struct omap_aes_dev *dd)
204{
205 u32 mask;
206
207 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
208 dd->pdata->dma_start;
209
210 omap_aes_write_mask(dd, AES_REG_MASK(dd), 0, mask);
211}
212
213struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_reqctx *rctx)
214{
215 struct omap_aes_dev *dd;
216
217 spin_lock_bh(&list_lock);
218 dd = list_first_entry(&dev_list, struct omap_aes_dev, list);
219 list_move_tail(&dd->list, &dev_list);
220 rctx->dd = dd;
221 spin_unlock_bh(&list_lock);
222
223 return dd;
224}
225
226static void omap_aes_dma_out_callback(void *data)
227{
228 struct omap_aes_dev *dd = data;
229
230 /* dma_lch_out - completed */
231 tasklet_schedule(&dd->done_task);
232}
233
234static int omap_aes_dma_init(struct omap_aes_dev *dd)
235{
236 int err;
237
238 dd->dma_lch_out = NULL;
239 dd->dma_lch_in = NULL;
240
241 dd->dma_lch_in = dma_request_chan(dd->dev, "rx");
242 if (IS_ERR(dd->dma_lch_in)) {
243 dev_err(dd->dev, "Unable to request in DMA channel\n");
244 return PTR_ERR(dd->dma_lch_in);
245 }
246
247 dd->dma_lch_out = dma_request_chan(dd->dev, "tx");
248 if (IS_ERR(dd->dma_lch_out)) {
249 dev_err(dd->dev, "Unable to request out DMA channel\n");
250 err = PTR_ERR(dd->dma_lch_out);
251 goto err_dma_out;
252 }
253
254 return 0;
255
256err_dma_out:
257 dma_release_channel(dd->dma_lch_in);
258
259 return err;
260}
261
262static void omap_aes_dma_cleanup(struct omap_aes_dev *dd)
263{
264 if (dd->pio_only)
265 return;
266
267 dma_release_channel(dd->dma_lch_out);
268 dma_release_channel(dd->dma_lch_in);
269}
270
271static int omap_aes_crypt_dma(struct omap_aes_dev *dd,
272 struct scatterlist *in_sg,
273 struct scatterlist *out_sg,
274 int in_sg_len, int out_sg_len)
275{
276 struct dma_async_tx_descriptor *tx_in, *tx_out;
277 struct dma_slave_config cfg;
278 int ret;
279
280 if (dd->pio_only) {
281 scatterwalk_start(&dd->in_walk, dd->in_sg);
282 scatterwalk_start(&dd->out_walk, dd->out_sg);
283
284 /* Enable DATAIN interrupt and let it take
285 care of the rest */
286 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
287 return 0;
288 }
289
290 dma_sync_sg_for_device(dd->dev, dd->in_sg, in_sg_len, DMA_TO_DEVICE);
291
292 memset(&cfg, 0, sizeof(cfg));
293
294 cfg.src_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
295 cfg.dst_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
296 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
297 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
298 cfg.src_maxburst = DST_MAXBURST;
299 cfg.dst_maxburst = DST_MAXBURST;
300
301 /* IN */
302 ret = dmaengine_slave_config(dd->dma_lch_in, &cfg);
303 if (ret) {
304 dev_err(dd->dev, "can't configure IN dmaengine slave: %d\n",
305 ret);
306 return ret;
307 }
308
309 tx_in = dmaengine_prep_slave_sg(dd->dma_lch_in, in_sg, in_sg_len,
310 DMA_MEM_TO_DEV,
311 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
312 if (!tx_in) {
313 dev_err(dd->dev, "IN prep_slave_sg() failed\n");
314 return -EINVAL;
315 }
316
317 /* No callback necessary */
318 tx_in->callback_param = dd;
319
320 /* OUT */
321 ret = dmaengine_slave_config(dd->dma_lch_out, &cfg);
322 if (ret) {
323 dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n",
324 ret);
325 return ret;
326 }
327
328 tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg, out_sg_len,
329 DMA_DEV_TO_MEM,
330 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
331 if (!tx_out) {
332 dev_err(dd->dev, "OUT prep_slave_sg() failed\n");
333 return -EINVAL;
334 }
335
336 if (dd->flags & FLAGS_GCM)
337 tx_out->callback = omap_aes_gcm_dma_out_callback;
338 else
339 tx_out->callback = omap_aes_dma_out_callback;
340 tx_out->callback_param = dd;
341
342 dmaengine_submit(tx_in);
343 dmaengine_submit(tx_out);
344
345 dma_async_issue_pending(dd->dma_lch_in);
346 dma_async_issue_pending(dd->dma_lch_out);
347
348 /* start DMA */
349 dd->pdata->trigger(dd, dd->total);
350
351 return 0;
352}
353
354int omap_aes_crypt_dma_start(struct omap_aes_dev *dd)
355{
356 int err;
357
358 pr_debug("total: %d\n", dd->total);
359
360 if (!dd->pio_only) {
361 err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len,
362 DMA_TO_DEVICE);
363 if (!err) {
364 dev_err(dd->dev, "dma_map_sg() error\n");
365 return -EINVAL;
366 }
367
368 err = dma_map_sg(dd->dev, dd->out_sg, dd->out_sg_len,
369 DMA_FROM_DEVICE);
370 if (!err) {
371 dev_err(dd->dev, "dma_map_sg() error\n");
372 return -EINVAL;
373 }
374 }
375
376 err = omap_aes_crypt_dma(dd, dd->in_sg, dd->out_sg, dd->in_sg_len,
377 dd->out_sg_len);
378 if (err && !dd->pio_only) {
379 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
380 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
381 DMA_FROM_DEVICE);
382 }
383
384 return err;
385}
386
387static void omap_aes_finish_req(struct omap_aes_dev *dd, int err)
388{
389 struct ablkcipher_request *req = dd->req;
390
391 pr_debug("err: %d\n", err);
392
393 crypto_finalize_ablkcipher_request(dd->engine, req, err);
394
395 pm_runtime_mark_last_busy(dd->dev);
396 pm_runtime_put_autosuspend(dd->dev);
397}
398
399int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd)
400{
401 pr_debug("total: %d\n", dd->total);
402
403 omap_aes_dma_stop(dd);
404
405
406 return 0;
407}
408
409static int omap_aes_handle_queue(struct omap_aes_dev *dd,
410 struct ablkcipher_request *req)
411{
412 if (req)
413 return crypto_transfer_ablkcipher_request_to_engine(dd->engine, req);
414
415 return 0;
416}
417
418static int omap_aes_prepare_req(struct crypto_engine *engine,
419 void *areq)
420{
421 struct ablkcipher_request *req = container_of(areq, struct ablkcipher_request, base);
422 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
423 crypto_ablkcipher_reqtfm(req));
424 struct omap_aes_reqctx *rctx = ablkcipher_request_ctx(req);
425 struct omap_aes_dev *dd = rctx->dd;
426 int ret;
427 u16 flags;
428
429 if (!dd)
430 return -ENODEV;
431
432 /* assign new request to device */
433 dd->req = req;
434 dd->total = req->nbytes;
435 dd->total_save = req->nbytes;
436 dd->in_sg = req->src;
437 dd->out_sg = req->dst;
438 dd->orig_out = req->dst;
439
440 flags = OMAP_CRYPTO_COPY_DATA;
441 if (req->src == req->dst)
442 flags |= OMAP_CRYPTO_FORCE_COPY;
443
444 ret = omap_crypto_align_sg(&dd->in_sg, dd->total, AES_BLOCK_SIZE,
445 dd->in_sgl, flags,
446 FLAGS_IN_DATA_ST_SHIFT, &dd->flags);
447 if (ret)
448 return ret;
449
450 ret = omap_crypto_align_sg(&dd->out_sg, dd->total, AES_BLOCK_SIZE,
451 &dd->out_sgl, 0,
452 FLAGS_OUT_DATA_ST_SHIFT, &dd->flags);
453 if (ret)
454 return ret;
455
456 dd->in_sg_len = sg_nents_for_len(dd->in_sg, dd->total);
457 if (dd->in_sg_len < 0)
458 return dd->in_sg_len;
459
460 dd->out_sg_len = sg_nents_for_len(dd->out_sg, dd->total);
461 if (dd->out_sg_len < 0)
462 return dd->out_sg_len;
463
464 rctx->mode &= FLAGS_MODE_MASK;
465 dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
466
467 dd->ctx = ctx;
468 rctx->dd = dd;
469
470 return omap_aes_write_ctrl(dd);
471}
472
473static int omap_aes_crypt_req(struct crypto_engine *engine,
474 void *areq)
475{
476 struct ablkcipher_request *req = container_of(areq, struct ablkcipher_request, base);
477 struct omap_aes_reqctx *rctx = ablkcipher_request_ctx(req);
478 struct omap_aes_dev *dd = rctx->dd;
479
480 if (!dd)
481 return -ENODEV;
482
483 return omap_aes_crypt_dma_start(dd);
484}
485
486static void omap_aes_done_task(unsigned long data)
487{
488 struct omap_aes_dev *dd = (struct omap_aes_dev *)data;
489
490 pr_debug("enter done_task\n");
491
492 if (!dd->pio_only) {
493 dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len,
494 DMA_FROM_DEVICE);
495 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
496 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
497 DMA_FROM_DEVICE);
498 omap_aes_crypt_dma_stop(dd);
499 }
500
501 omap_crypto_cleanup(dd->in_sgl, NULL, 0, dd->total_save,
502 FLAGS_IN_DATA_ST_SHIFT, dd->flags);
503
504 omap_crypto_cleanup(&dd->out_sgl, dd->orig_out, 0, dd->total_save,
505 FLAGS_OUT_DATA_ST_SHIFT, dd->flags);
506
507 omap_aes_finish_req(dd, 0);
508
509 pr_debug("exit\n");
510}
511
512static int omap_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
513{
514 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
515 crypto_ablkcipher_reqtfm(req));
516 struct omap_aes_reqctx *rctx = ablkcipher_request_ctx(req);
517 struct omap_aes_dev *dd;
518 int ret;
519
520 pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->nbytes,
521 !!(mode & FLAGS_ENCRYPT),
522 !!(mode & FLAGS_CBC));
523
524 if (req->nbytes < aes_fallback_sz) {
525 SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback);
526
527 skcipher_request_set_tfm(subreq, ctx->fallback);
528 skcipher_request_set_callback(subreq, req->base.flags, NULL,
529 NULL);
530 skcipher_request_set_crypt(subreq, req->src, req->dst,
531 req->nbytes, req->info);
532
533 if (mode & FLAGS_ENCRYPT)
534 ret = crypto_skcipher_encrypt(subreq);
535 else
536 ret = crypto_skcipher_decrypt(subreq);
537
538 skcipher_request_zero(subreq);
539 return ret;
540 }
541 dd = omap_aes_find_dev(rctx);
542 if (!dd)
543 return -ENODEV;
544
545 rctx->mode = mode;
546
547 return omap_aes_handle_queue(dd, req);
548}
549
550/* ********************** ALG API ************************************ */
551
552static int omap_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
553 unsigned int keylen)
554{
555 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
556 int ret;
557
558 if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
559 keylen != AES_KEYSIZE_256)
560 return -EINVAL;
561
562 pr_debug("enter, keylen: %d\n", keylen);
563
564 memcpy(ctx->key, key, keylen);
565 ctx->keylen = keylen;
566
567 crypto_skcipher_clear_flags(ctx->fallback, CRYPTO_TFM_REQ_MASK);
568 crypto_skcipher_set_flags(ctx->fallback, tfm->base.crt_flags &
569 CRYPTO_TFM_REQ_MASK);
570
571 ret = crypto_skcipher_setkey(ctx->fallback, key, keylen);
572 if (!ret)
573 return 0;
574
575 return 0;
576}
577
578static int omap_aes_ecb_encrypt(struct ablkcipher_request *req)
579{
580 return omap_aes_crypt(req, FLAGS_ENCRYPT);
581}
582
583static int omap_aes_ecb_decrypt(struct ablkcipher_request *req)
584{
585 return omap_aes_crypt(req, 0);
586}
587
588static int omap_aes_cbc_encrypt(struct ablkcipher_request *req)
589{
590 return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
591}
592
593static int omap_aes_cbc_decrypt(struct ablkcipher_request *req)
594{
595 return omap_aes_crypt(req, FLAGS_CBC);
596}
597
598static int omap_aes_ctr_encrypt(struct ablkcipher_request *req)
599{
600 return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CTR);
601}
602
603static int omap_aes_ctr_decrypt(struct ablkcipher_request *req)
604{
605 return omap_aes_crypt(req, FLAGS_CTR);
606}
607
608static int omap_aes_prepare_req(struct crypto_engine *engine,
609 void *req);
610static int omap_aes_crypt_req(struct crypto_engine *engine,
611 void *req);
612
613static int omap_aes_cra_init(struct crypto_tfm *tfm)
614{
615 const char *name = crypto_tfm_alg_name(tfm);
616 const u32 flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK;
617 struct omap_aes_ctx *ctx = crypto_tfm_ctx(tfm);
618 struct crypto_skcipher *blk;
619
620 blk = crypto_alloc_skcipher(name, 0, flags);
621 if (IS_ERR(blk))
622 return PTR_ERR(blk);
623
624 ctx->fallback = blk;
625
626 tfm->crt_ablkcipher.reqsize = sizeof(struct omap_aes_reqctx);
627
628 ctx->enginectx.op.prepare_request = omap_aes_prepare_req;
629 ctx->enginectx.op.unprepare_request = NULL;
630 ctx->enginectx.op.do_one_request = omap_aes_crypt_req;
631
632 return 0;
633}
634
635static int omap_aes_gcm_cra_init(struct crypto_aead *tfm)
636{
637 struct omap_aes_dev *dd = NULL;
638 struct omap_aes_ctx *ctx = crypto_aead_ctx(tfm);
639 int err;
640
641 /* Find AES device, currently picks the first device */
642 spin_lock_bh(&list_lock);
643 list_for_each_entry(dd, &dev_list, list) {
644 break;
645 }
646 spin_unlock_bh(&list_lock);
647
648 err = pm_runtime_get_sync(dd->dev);
649 if (err < 0) {
650 dev_err(dd->dev, "%s: failed to get_sync(%d)\n",
651 __func__, err);
652 return err;
653 }
654
655 tfm->reqsize = sizeof(struct omap_aes_reqctx);
656 ctx->ctr = crypto_alloc_skcipher("ecb(aes)", 0, 0);
657 if (IS_ERR(ctx->ctr)) {
658 pr_warn("could not load aes driver for encrypting IV\n");
659 return PTR_ERR(ctx->ctr);
660 }
661
662 return 0;
663}
664
665static void omap_aes_cra_exit(struct crypto_tfm *tfm)
666{
667 struct omap_aes_ctx *ctx = crypto_tfm_ctx(tfm);
668
669 if (ctx->fallback)
670 crypto_free_skcipher(ctx->fallback);
671
672 ctx->fallback = NULL;
673}
674
675static void omap_aes_gcm_cra_exit(struct crypto_aead *tfm)
676{
677 struct omap_aes_ctx *ctx = crypto_aead_ctx(tfm);
678
679 omap_aes_cra_exit(crypto_aead_tfm(tfm));
680
681 if (ctx->ctr)
682 crypto_free_skcipher(ctx->ctr);
683}
684
685/* ********************** ALGS ************************************ */
686
687static struct crypto_alg algs_ecb_cbc[] = {
688{
689 .cra_name = "ecb(aes)",
690 .cra_driver_name = "ecb-aes-omap",
691 .cra_priority = 300,
692 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
693 CRYPTO_ALG_KERN_DRIVER_ONLY |
694 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
695 .cra_blocksize = AES_BLOCK_SIZE,
696 .cra_ctxsize = sizeof(struct omap_aes_ctx),
697 .cra_alignmask = 0,
698 .cra_type = &crypto_ablkcipher_type,
699 .cra_module = THIS_MODULE,
700 .cra_init = omap_aes_cra_init,
701 .cra_exit = omap_aes_cra_exit,
702 .cra_u.ablkcipher = {
703 .min_keysize = AES_MIN_KEY_SIZE,
704 .max_keysize = AES_MAX_KEY_SIZE,
705 .setkey = omap_aes_setkey,
706 .encrypt = omap_aes_ecb_encrypt,
707 .decrypt = omap_aes_ecb_decrypt,
708 }
709},
710{
711 .cra_name = "cbc(aes)",
712 .cra_driver_name = "cbc-aes-omap",
713 .cra_priority = 300,
714 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
715 CRYPTO_ALG_KERN_DRIVER_ONLY |
716 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
717 .cra_blocksize = AES_BLOCK_SIZE,
718 .cra_ctxsize = sizeof(struct omap_aes_ctx),
719 .cra_alignmask = 0,
720 .cra_type = &crypto_ablkcipher_type,
721 .cra_module = THIS_MODULE,
722 .cra_init = omap_aes_cra_init,
723 .cra_exit = omap_aes_cra_exit,
724 .cra_u.ablkcipher = {
725 .min_keysize = AES_MIN_KEY_SIZE,
726 .max_keysize = AES_MAX_KEY_SIZE,
727 .ivsize = AES_BLOCK_SIZE,
728 .setkey = omap_aes_setkey,
729 .encrypt = omap_aes_cbc_encrypt,
730 .decrypt = omap_aes_cbc_decrypt,
731 }
732}
733};
734
735static struct crypto_alg algs_ctr[] = {
736{
737 .cra_name = "ctr(aes)",
738 .cra_driver_name = "ctr-aes-omap",
739 .cra_priority = 300,
740 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
741 CRYPTO_ALG_KERN_DRIVER_ONLY |
742 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
743 .cra_blocksize = AES_BLOCK_SIZE,
744 .cra_ctxsize = sizeof(struct omap_aes_ctx),
745 .cra_alignmask = 0,
746 .cra_type = &crypto_ablkcipher_type,
747 .cra_module = THIS_MODULE,
748 .cra_init = omap_aes_cra_init,
749 .cra_exit = omap_aes_cra_exit,
750 .cra_u.ablkcipher = {
751 .min_keysize = AES_MIN_KEY_SIZE,
752 .max_keysize = AES_MAX_KEY_SIZE,
753 .geniv = "eseqiv",
754 .ivsize = AES_BLOCK_SIZE,
755 .setkey = omap_aes_setkey,
756 .encrypt = omap_aes_ctr_encrypt,
757 .decrypt = omap_aes_ctr_decrypt,
758 }
759} ,
760};
761
762static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc[] = {
763 {
764 .algs_list = algs_ecb_cbc,
765 .size = ARRAY_SIZE(algs_ecb_cbc),
766 },
767};
768
769static struct aead_alg algs_aead_gcm[] = {
770{
771 .base = {
772 .cra_name = "gcm(aes)",
773 .cra_driver_name = "gcm-aes-omap",
774 .cra_priority = 300,
775 .cra_flags = CRYPTO_ALG_ASYNC |
776 CRYPTO_ALG_KERN_DRIVER_ONLY,
777 .cra_blocksize = 1,
778 .cra_ctxsize = sizeof(struct omap_aes_ctx),
779 .cra_alignmask = 0xf,
780 .cra_module = THIS_MODULE,
781 },
782 .init = omap_aes_gcm_cra_init,
783 .exit = omap_aes_gcm_cra_exit,
784 .ivsize = GCM_AES_IV_SIZE,
785 .maxauthsize = AES_BLOCK_SIZE,
786 .setkey = omap_aes_gcm_setkey,
787 .encrypt = omap_aes_gcm_encrypt,
788 .decrypt = omap_aes_gcm_decrypt,
789},
790{
791 .base = {
792 .cra_name = "rfc4106(gcm(aes))",
793 .cra_driver_name = "rfc4106-gcm-aes-omap",
794 .cra_priority = 300,
795 .cra_flags = CRYPTO_ALG_ASYNC |
796 CRYPTO_ALG_KERN_DRIVER_ONLY,
797 .cra_blocksize = 1,
798 .cra_ctxsize = sizeof(struct omap_aes_ctx),
799 .cra_alignmask = 0xf,
800 .cra_module = THIS_MODULE,
801 },
802 .init = omap_aes_gcm_cra_init,
803 .exit = omap_aes_gcm_cra_exit,
804 .maxauthsize = AES_BLOCK_SIZE,
805 .ivsize = GCM_RFC4106_IV_SIZE,
806 .setkey = omap_aes_4106gcm_setkey,
807 .encrypt = omap_aes_4106gcm_encrypt,
808 .decrypt = omap_aes_4106gcm_decrypt,
809},
810};
811
812static struct omap_aes_aead_algs omap_aes_aead_info = {
813 .algs_list = algs_aead_gcm,
814 .size = ARRAY_SIZE(algs_aead_gcm),
815};
816
817static const struct omap_aes_pdata omap_aes_pdata_omap2 = {
818 .algs_info = omap_aes_algs_info_ecb_cbc,
819 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc),
820 .trigger = omap_aes_dma_trigger_omap2,
821 .key_ofs = 0x1c,
822 .iv_ofs = 0x20,
823 .ctrl_ofs = 0x30,
824 .data_ofs = 0x34,
825 .rev_ofs = 0x44,
826 .mask_ofs = 0x48,
827 .dma_enable_in = BIT(2),
828 .dma_enable_out = BIT(3),
829 .dma_start = BIT(5),
830 .major_mask = 0xf0,
831 .major_shift = 4,
832 .minor_mask = 0x0f,
833 .minor_shift = 0,
834};
835
836#ifdef CONFIG_OF
837static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc_ctr[] = {
838 {
839 .algs_list = algs_ecb_cbc,
840 .size = ARRAY_SIZE(algs_ecb_cbc),
841 },
842 {
843 .algs_list = algs_ctr,
844 .size = ARRAY_SIZE(algs_ctr),
845 },
846};
847
848static const struct omap_aes_pdata omap_aes_pdata_omap3 = {
849 .algs_info = omap_aes_algs_info_ecb_cbc_ctr,
850 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
851 .trigger = omap_aes_dma_trigger_omap2,
852 .key_ofs = 0x1c,
853 .iv_ofs = 0x20,
854 .ctrl_ofs = 0x30,
855 .data_ofs = 0x34,
856 .rev_ofs = 0x44,
857 .mask_ofs = 0x48,
858 .dma_enable_in = BIT(2),
859 .dma_enable_out = BIT(3),
860 .dma_start = BIT(5),
861 .major_mask = 0xf0,
862 .major_shift = 4,
863 .minor_mask = 0x0f,
864 .minor_shift = 0,
865};
866
867static const struct omap_aes_pdata omap_aes_pdata_omap4 = {
868 .algs_info = omap_aes_algs_info_ecb_cbc_ctr,
869 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
870 .aead_algs_info = &omap_aes_aead_info,
871 .trigger = omap_aes_dma_trigger_omap4,
872 .key_ofs = 0x3c,
873 .iv_ofs = 0x40,
874 .ctrl_ofs = 0x50,
875 .data_ofs = 0x60,
876 .rev_ofs = 0x80,
877 .mask_ofs = 0x84,
878 .irq_status_ofs = 0x8c,
879 .irq_enable_ofs = 0x90,
880 .dma_enable_in = BIT(5),
881 .dma_enable_out = BIT(6),
882 .major_mask = 0x0700,
883 .major_shift = 8,
884 .minor_mask = 0x003f,
885 .minor_shift = 0,
886};
887
888static irqreturn_t omap_aes_irq(int irq, void *dev_id)
889{
890 struct omap_aes_dev *dd = dev_id;
891 u32 status, i;
892 u32 *src, *dst;
893
894 status = omap_aes_read(dd, AES_REG_IRQ_STATUS(dd));
895 if (status & AES_REG_IRQ_DATA_IN) {
896 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
897
898 BUG_ON(!dd->in_sg);
899
900 BUG_ON(_calc_walked(in) > dd->in_sg->length);
901
902 src = sg_virt(dd->in_sg) + _calc_walked(in);
903
904 for (i = 0; i < AES_BLOCK_WORDS; i++) {
905 omap_aes_write(dd, AES_REG_DATA_N(dd, i), *src);
906
907 scatterwalk_advance(&dd->in_walk, 4);
908 if (dd->in_sg->length == _calc_walked(in)) {
909 dd->in_sg = sg_next(dd->in_sg);
910 if (dd->in_sg) {
911 scatterwalk_start(&dd->in_walk,
912 dd->in_sg);
913 src = sg_virt(dd->in_sg) +
914 _calc_walked(in);
915 }
916 } else {
917 src++;
918 }
919 }
920
921 /* Clear IRQ status */
922 status &= ~AES_REG_IRQ_DATA_IN;
923 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
924
925 /* Enable DATA_OUT interrupt */
926 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x4);
927
928 } else if (status & AES_REG_IRQ_DATA_OUT) {
929 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
930
931 BUG_ON(!dd->out_sg);
932
933 BUG_ON(_calc_walked(out) > dd->out_sg->length);
934
935 dst = sg_virt(dd->out_sg) + _calc_walked(out);
936
937 for (i = 0; i < AES_BLOCK_WORDS; i++) {
938 *dst = omap_aes_read(dd, AES_REG_DATA_N(dd, i));
939 scatterwalk_advance(&dd->out_walk, 4);
940 if (dd->out_sg->length == _calc_walked(out)) {
941 dd->out_sg = sg_next(dd->out_sg);
942 if (dd->out_sg) {
943 scatterwalk_start(&dd->out_walk,
944 dd->out_sg);
945 dst = sg_virt(dd->out_sg) +
946 _calc_walked(out);
947 }
948 } else {
949 dst++;
950 }
951 }
952
953 dd->total -= min_t(size_t, AES_BLOCK_SIZE, dd->total);
954
955 /* Clear IRQ status */
956 status &= ~AES_REG_IRQ_DATA_OUT;
957 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
958
959 if (!dd->total)
960 /* All bytes read! */
961 tasklet_schedule(&dd->done_task);
962 else
963 /* Enable DATA_IN interrupt for next block */
964 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
965 }
966
967 return IRQ_HANDLED;
968}
969
970static const struct of_device_id omap_aes_of_match[] = {
971 {
972 .compatible = "ti,omap2-aes",
973 .data = &omap_aes_pdata_omap2,
974 },
975 {
976 .compatible = "ti,omap3-aes",
977 .data = &omap_aes_pdata_omap3,
978 },
979 {
980 .compatible = "ti,omap4-aes",
981 .data = &omap_aes_pdata_omap4,
982 },
983 {},
984};
985MODULE_DEVICE_TABLE(of, omap_aes_of_match);
986
987static int omap_aes_get_res_of(struct omap_aes_dev *dd,
988 struct device *dev, struct resource *res)
989{
990 struct device_node *node = dev->of_node;
991 int err = 0;
992
993 dd->pdata = of_device_get_match_data(dev);
994 if (!dd->pdata) {
995 dev_err(dev, "no compatible OF match\n");
996 err = -EINVAL;
997 goto err;
998 }
999
1000 err = of_address_to_resource(node, 0, res);
1001 if (err < 0) {
1002 dev_err(dev, "can't translate OF node address\n");
1003 err = -EINVAL;
1004 goto err;
1005 }
1006
1007err:
1008 return err;
1009}
1010#else
1011static const struct of_device_id omap_aes_of_match[] = {
1012 {},
1013};
1014
1015static int omap_aes_get_res_of(struct omap_aes_dev *dd,
1016 struct device *dev, struct resource *res)
1017{
1018 return -EINVAL;
1019}
1020#endif
1021
1022static int omap_aes_get_res_pdev(struct omap_aes_dev *dd,
1023 struct platform_device *pdev, struct resource *res)
1024{
1025 struct device *dev = &pdev->dev;
1026 struct resource *r;
1027 int err = 0;
1028
1029 /* Get the base address */
1030 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1031 if (!r) {
1032 dev_err(dev, "no MEM resource info\n");
1033 err = -ENODEV;
1034 goto err;
1035 }
1036 memcpy(res, r, sizeof(*res));
1037
1038 /* Only OMAP2/3 can be non-DT */
1039 dd->pdata = &omap_aes_pdata_omap2;
1040
1041err:
1042 return err;
1043}
1044
1045static ssize_t fallback_show(struct device *dev, struct device_attribute *attr,
1046 char *buf)
1047{
1048 return sprintf(buf, "%d\n", aes_fallback_sz);
1049}
1050
1051static ssize_t fallback_store(struct device *dev, struct device_attribute *attr,
1052 const char *buf, size_t size)
1053{
1054 ssize_t status;
1055 long value;
1056
1057 status = kstrtol(buf, 0, &value);
1058 if (status)
1059 return status;
1060
1061 /* HW accelerator only works with buffers > 9 */
1062 if (value < 9) {
1063 dev_err(dev, "minimum fallback size 9\n");
1064 return -EINVAL;
1065 }
1066
1067 aes_fallback_sz = value;
1068
1069 return size;
1070}
1071
1072static ssize_t queue_len_show(struct device *dev, struct device_attribute *attr,
1073 char *buf)
1074{
1075 struct omap_aes_dev *dd = dev_get_drvdata(dev);
1076
1077 return sprintf(buf, "%d\n", dd->engine->queue.max_qlen);
1078}
1079
1080static ssize_t queue_len_store(struct device *dev,
1081 struct device_attribute *attr, const char *buf,
1082 size_t size)
1083{
1084 struct omap_aes_dev *dd;
1085 ssize_t status;
1086 long value;
1087 unsigned long flags;
1088
1089 status = kstrtol(buf, 0, &value);
1090 if (status)
1091 return status;
1092
1093 if (value < 1)
1094 return -EINVAL;
1095
1096 /*
1097 * Changing the queue size in fly is safe, if size becomes smaller
1098 * than current size, it will just not accept new entries until
1099 * it has shrank enough.
1100 */
1101 spin_lock_bh(&list_lock);
1102 list_for_each_entry(dd, &dev_list, list) {
1103 spin_lock_irqsave(&dd->lock, flags);
1104 dd->engine->queue.max_qlen = value;
1105 dd->aead_queue.base.max_qlen = value;
1106 spin_unlock_irqrestore(&dd->lock, flags);
1107 }
1108 spin_unlock_bh(&list_lock);
1109
1110 return size;
1111}
1112
1113static DEVICE_ATTR_RW(queue_len);
1114static DEVICE_ATTR_RW(fallback);
1115
1116static struct attribute *omap_aes_attrs[] = {
1117 &dev_attr_queue_len.attr,
1118 &dev_attr_fallback.attr,
1119 NULL,
1120};
1121
1122static struct attribute_group omap_aes_attr_group = {
1123 .attrs = omap_aes_attrs,
1124};
1125
1126static int omap_aes_probe(struct platform_device *pdev)
1127{
1128 struct device *dev = &pdev->dev;
1129 struct omap_aes_dev *dd;
1130 struct crypto_alg *algp;
1131 struct aead_alg *aalg;
1132 struct resource res;
1133 int err = -ENOMEM, i, j, irq = -1;
1134 u32 reg;
1135
1136 dd = devm_kzalloc(dev, sizeof(struct omap_aes_dev), GFP_KERNEL);
1137 if (dd == NULL) {
1138 dev_err(dev, "unable to alloc data struct.\n");
1139 goto err_data;
1140 }
1141 dd->dev = dev;
1142 platform_set_drvdata(pdev, dd);
1143
1144 aead_init_queue(&dd->aead_queue, OMAP_AES_QUEUE_LENGTH);
1145
1146 err = (dev->of_node) ? omap_aes_get_res_of(dd, dev, &res) :
1147 omap_aes_get_res_pdev(dd, pdev, &res);
1148 if (err)
1149 goto err_res;
1150
1151 dd->io_base = devm_ioremap_resource(dev, &res);
1152 if (IS_ERR(dd->io_base)) {
1153 err = PTR_ERR(dd->io_base);
1154 goto err_res;
1155 }
1156 dd->phys_base = res.start;
1157
1158 pm_runtime_use_autosuspend(dev);
1159 pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY);
1160
1161 pm_runtime_enable(dev);
1162 err = pm_runtime_get_sync(dev);
1163 if (err < 0) {
1164 dev_err(dev, "%s: failed to get_sync(%d)\n",
1165 __func__, err);
1166 goto err_res;
1167 }
1168
1169 omap_aes_dma_stop(dd);
1170
1171 reg = omap_aes_read(dd, AES_REG_REV(dd));
1172
1173 pm_runtime_put_sync(dev);
1174
1175 dev_info(dev, "OMAP AES hw accel rev: %u.%u\n",
1176 (reg & dd->pdata->major_mask) >> dd->pdata->major_shift,
1177 (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
1178
1179 tasklet_init(&dd->done_task, omap_aes_done_task, (unsigned long)dd);
1180
1181 err = omap_aes_dma_init(dd);
1182 if (err == -EPROBE_DEFER) {
1183 goto err_irq;
1184 } else if (err && AES_REG_IRQ_STATUS(dd) && AES_REG_IRQ_ENABLE(dd)) {
1185 dd->pio_only = 1;
1186
1187 irq = platform_get_irq(pdev, 0);
1188 if (irq < 0) {
1189 dev_err(dev, "can't get IRQ resource\n");
1190 err = irq;
1191 goto err_irq;
1192 }
1193
1194 err = devm_request_irq(dev, irq, omap_aes_irq, 0,
1195 dev_name(dev), dd);
1196 if (err) {
1197 dev_err(dev, "Unable to grab omap-aes IRQ\n");
1198 goto err_irq;
1199 }
1200 }
1201
1202 spin_lock_init(&dd->lock);
1203
1204 INIT_LIST_HEAD(&dd->list);
1205 spin_lock(&list_lock);
1206 list_add_tail(&dd->list, &dev_list);
1207 spin_unlock(&list_lock);
1208
1209 /* Initialize crypto engine */
1210 dd->engine = crypto_engine_alloc_init(dev, 1);
1211 if (!dd->engine) {
1212 err = -ENOMEM;
1213 goto err_engine;
1214 }
1215
1216 err = crypto_engine_start(dd->engine);
1217 if (err)
1218 goto err_engine;
1219
1220 for (i = 0; i < dd->pdata->algs_info_size; i++) {
1221 if (!dd->pdata->algs_info[i].registered) {
1222 for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
1223 algp = &dd->pdata->algs_info[i].algs_list[j];
1224
1225 pr_debug("reg alg: %s\n", algp->cra_name);
1226 INIT_LIST_HEAD(&algp->cra_list);
1227
1228 err = crypto_register_alg(algp);
1229 if (err)
1230 goto err_algs;
1231
1232 dd->pdata->algs_info[i].registered++;
1233 }
1234 }
1235 }
1236
1237 if (dd->pdata->aead_algs_info &&
1238 !dd->pdata->aead_algs_info->registered) {
1239 for (i = 0; i < dd->pdata->aead_algs_info->size; i++) {
1240 aalg = &dd->pdata->aead_algs_info->algs_list[i];
1241 algp = &aalg->base;
1242
1243 pr_debug("reg alg: %s\n", algp->cra_name);
1244 INIT_LIST_HEAD(&algp->cra_list);
1245
1246 err = crypto_register_aead(aalg);
1247 if (err)
1248 goto err_aead_algs;
1249
1250 dd->pdata->aead_algs_info->registered++;
1251 }
1252 }
1253
1254 err = sysfs_create_group(&dev->kobj, &omap_aes_attr_group);
1255 if (err) {
1256 dev_err(dev, "could not create sysfs device attrs\n");
1257 goto err_aead_algs;
1258 }
1259
1260 return 0;
1261err_aead_algs:
1262 for (i = dd->pdata->aead_algs_info->registered - 1; i >= 0; i--) {
1263 aalg = &dd->pdata->aead_algs_info->algs_list[i];
1264 crypto_unregister_aead(aalg);
1265 }
1266err_algs:
1267 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1268 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1269 crypto_unregister_alg(
1270 &dd->pdata->algs_info[i].algs_list[j]);
1271
1272err_engine:
1273 if (dd->engine)
1274 crypto_engine_exit(dd->engine);
1275
1276 omap_aes_dma_cleanup(dd);
1277err_irq:
1278 tasklet_kill(&dd->done_task);
1279 pm_runtime_disable(dev);
1280err_res:
1281 dd = NULL;
1282err_data:
1283 dev_err(dev, "initialization failed.\n");
1284 return err;
1285}
1286
1287static int omap_aes_remove(struct platform_device *pdev)
1288{
1289 struct omap_aes_dev *dd = platform_get_drvdata(pdev);
1290 struct aead_alg *aalg;
1291 int i, j;
1292
1293 if (!dd)
1294 return -ENODEV;
1295
1296 spin_lock(&list_lock);
1297 list_del(&dd->list);
1298 spin_unlock(&list_lock);
1299
1300 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1301 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1302 crypto_unregister_alg(
1303 &dd->pdata->algs_info[i].algs_list[j]);
1304
1305 for (i = dd->pdata->aead_algs_info->size - 1; i >= 0; i--) {
1306 aalg = &dd->pdata->aead_algs_info->algs_list[i];
1307 crypto_unregister_aead(aalg);
1308 }
1309
1310 crypto_engine_exit(dd->engine);
1311
1312 tasklet_kill(&dd->done_task);
1313 omap_aes_dma_cleanup(dd);
1314 pm_runtime_disable(dd->dev);
1315 dd = NULL;
1316
1317 return 0;
1318}
1319
1320#ifdef CONFIG_PM_SLEEP
1321static int omap_aes_suspend(struct device *dev)
1322{
1323 pm_runtime_put_sync(dev);
1324 return 0;
1325}
1326
1327static int omap_aes_resume(struct device *dev)
1328{
1329 pm_runtime_get_sync(dev);
1330 return 0;
1331}
1332#endif
1333
1334static SIMPLE_DEV_PM_OPS(omap_aes_pm_ops, omap_aes_suspend, omap_aes_resume);
1335
1336static struct platform_driver omap_aes_driver = {
1337 .probe = omap_aes_probe,
1338 .remove = omap_aes_remove,
1339 .driver = {
1340 .name = "omap-aes",
1341 .pm = &omap_aes_pm_ops,
1342 .of_match_table = omap_aes_of_match,
1343 },
1344};
1345
1346module_platform_driver(omap_aes_driver);
1347
1348MODULE_DESCRIPTION("OMAP AES hw acceleration support.");
1349MODULE_LICENSE("GPL v2");
1350MODULE_AUTHOR("Dmitry Kasatkin");
1351