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authorDmitry Kasatkin <dmitry.kasatkin@nokia.com>2010-09-03 07:16:02 -0400
committerHerbert Xu <herbert@gondor.apana.org.au>2010-09-03 07:16:02 -0400
commit537559a5b3ef854772bd89fbb43aa77d0bbfb721 (patch)
tree7341e9a9b9b91fbada30ef903950e5e12f5a74a1 /drivers/crypto/omap-aes.c
parentb744c679f62b368cb94c21c1dcd4618e42d88d63 (diff)
crypto: omap-aes - OMAP2/3 AES hw accelerator driver
Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@nokia.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/omap-aes.c')
-rw-r--r--drivers/crypto/omap-aes.c948
1 files changed, 948 insertions, 0 deletions
diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c
new file mode 100644
index 000000000000..799ca517c121
--- /dev/null
+++ b/drivers/crypto/omap-aes.c
@@ -0,0 +1,948 @@
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 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as published
11 * by the Free Software Foundation.
12 *
13 */
14
15#define pr_fmt(fmt) "%s: " fmt, __func__
16
17#include <linux/err.h>
18#include <linux/module.h>
19#include <linux/init.h>
20#include <linux/errno.h>
21#include <linux/kernel.h>
22#include <linux/clk.h>
23#include <linux/platform_device.h>
24#include <linux/scatterlist.h>
25#include <linux/dma-mapping.h>
26#include <linux/io.h>
27#include <linux/crypto.h>
28#include <linux/interrupt.h>
29#include <crypto/scatterwalk.h>
30#include <crypto/aes.h>
31
32#include <plat/cpu.h>
33#include <plat/dma.h>
34
35/* OMAP TRM gives bitfields as start:end, where start is the higher bit
36 number. For example 7:0 */
37#define FLD_MASK(start, end) (((1 << ((start) - (end) + 1)) - 1) << (end))
38#define FLD_VAL(val, start, end) (((val) << (end)) & FLD_MASK(start, end))
39
40#define AES_REG_KEY(x) (0x1C - ((x ^ 0x01) * 0x04))
41#define AES_REG_IV(x) (0x20 + ((x) * 0x04))
42
43#define AES_REG_CTRL 0x30
44#define AES_REG_CTRL_CTR_WIDTH (1 << 7)
45#define AES_REG_CTRL_CTR (1 << 6)
46#define AES_REG_CTRL_CBC (1 << 5)
47#define AES_REG_CTRL_KEY_SIZE (3 << 3)
48#define AES_REG_CTRL_DIRECTION (1 << 2)
49#define AES_REG_CTRL_INPUT_READY (1 << 1)
50#define AES_REG_CTRL_OUTPUT_READY (1 << 0)
51
52#define AES_REG_DATA 0x34
53#define AES_REG_DATA_N(x) (0x34 + ((x) * 0x04))
54
55#define AES_REG_REV 0x44
56#define AES_REG_REV_MAJOR 0xF0
57#define AES_REG_REV_MINOR 0x0F
58
59#define AES_REG_MASK 0x48
60#define AES_REG_MASK_SIDLE (1 << 6)
61#define AES_REG_MASK_START (1 << 5)
62#define AES_REG_MASK_DMA_OUT_EN (1 << 3)
63#define AES_REG_MASK_DMA_IN_EN (1 << 2)
64#define AES_REG_MASK_SOFTRESET (1 << 1)
65#define AES_REG_AUTOIDLE (1 << 0)
66
67#define AES_REG_SYSSTATUS 0x4C
68#define AES_REG_SYSSTATUS_RESETDONE (1 << 0)
69
70#define DEFAULT_TIMEOUT (5*HZ)
71
72#define FLAGS_MODE_MASK 0x000f
73#define FLAGS_ENCRYPT BIT(0)
74#define FLAGS_CBC BIT(1)
75#define FLAGS_GIV BIT(2)
76
77#define FLAGS_NEW_KEY BIT(4)
78#define FLAGS_NEW_IV BIT(5)
79#define FLAGS_INIT BIT(6)
80#define FLAGS_FAST BIT(7)
81#define FLAGS_BUSY 8
82
83struct omap_aes_ctx {
84 struct omap_aes_dev *dd;
85
86 int keylen;
87 u32 key[AES_KEYSIZE_256 / sizeof(u32)];
88 unsigned long flags;
89};
90
91struct omap_aes_reqctx {
92 unsigned long mode;
93};
94
95#define OMAP_AES_QUEUE_LENGTH 1
96#define OMAP_AES_CACHE_SIZE 0
97
98struct omap_aes_dev {
99 struct list_head list;
100 unsigned long phys_base;
101 void __iomem *io_base;
102 struct clk *iclk;
103 struct omap_aes_ctx *ctx;
104 struct device *dev;
105 unsigned long flags;
106
107 u32 *iv;
108 u32 ctrl;
109
110 spinlock_t lock;
111 struct crypto_queue queue;
112
113 struct tasklet_struct task;
114
115 struct ablkcipher_request *req;
116 size_t total;
117 struct scatterlist *in_sg;
118 size_t in_offset;
119 struct scatterlist *out_sg;
120 size_t out_offset;
121
122 size_t buflen;
123 void *buf_in;
124 size_t dma_size;
125 int dma_in;
126 int dma_lch_in;
127 dma_addr_t dma_addr_in;
128 void *buf_out;
129 int dma_out;
130 int dma_lch_out;
131 dma_addr_t dma_addr_out;
132};
133
134/* keep registered devices data here */
135static LIST_HEAD(dev_list);
136static DEFINE_SPINLOCK(list_lock);
137
138static inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset)
139{
140 return __raw_readl(dd->io_base + offset);
141}
142
143static inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset,
144 u32 value)
145{
146 __raw_writel(value, dd->io_base + offset);
147}
148
149static inline void omap_aes_write_mask(struct omap_aes_dev *dd, u32 offset,
150 u32 value, u32 mask)
151{
152 u32 val;
153
154 val = omap_aes_read(dd, offset);
155 val &= ~mask;
156 val |= value;
157 omap_aes_write(dd, offset, val);
158}
159
160static void omap_aes_write_n(struct omap_aes_dev *dd, u32 offset,
161 u32 *value, int count)
162{
163 for (; count--; value++, offset += 4)
164 omap_aes_write(dd, offset, *value);
165}
166
167static int omap_aes_wait(struct omap_aes_dev *dd, u32 offset, u32 bit)
168{
169 unsigned long timeout = jiffies + DEFAULT_TIMEOUT;
170
171 while (!(omap_aes_read(dd, offset) & bit)) {
172 if (time_is_before_jiffies(timeout)) {
173 dev_err(dd->dev, "omap-aes timeout\n");
174 return -ETIMEDOUT;
175 }
176 }
177 return 0;
178}
179
180static int omap_aes_hw_init(struct omap_aes_dev *dd)
181{
182 int err = 0;
183
184 clk_enable(dd->iclk);
185 if (!(dd->flags & FLAGS_INIT)) {
186 /* is it necessary to reset before every operation? */
187 omap_aes_write_mask(dd, AES_REG_MASK, AES_REG_MASK_SOFTRESET,
188 AES_REG_MASK_SOFTRESET);
189 /*
190 * prevent OCP bus error (SRESP) in case an access to the module
191 * is performed while the module is coming out of soft reset
192 */
193 __asm__ __volatile__("nop");
194 __asm__ __volatile__("nop");
195
196 err = omap_aes_wait(dd, AES_REG_SYSSTATUS,
197 AES_REG_SYSSTATUS_RESETDONE);
198 if (!err)
199 dd->flags |= FLAGS_INIT;
200 }
201
202 return err;
203}
204
205static void omap_aes_hw_cleanup(struct omap_aes_dev *dd)
206{
207 clk_disable(dd->iclk);
208}
209
210static void omap_aes_write_ctrl(struct omap_aes_dev *dd)
211{
212 unsigned int key32;
213 int i;
214 u32 val, mask;
215
216 val = FLD_VAL(((dd->ctx->keylen >> 3) - 1), 4, 3);
217 if (dd->flags & FLAGS_CBC)
218 val |= AES_REG_CTRL_CBC;
219 if (dd->flags & FLAGS_ENCRYPT)
220 val |= AES_REG_CTRL_DIRECTION;
221
222 if (dd->ctrl == val && !(dd->flags & FLAGS_NEW_IV) &&
223 !(dd->ctx->flags & FLAGS_NEW_KEY))
224 goto out;
225
226 /* only need to write control registers for new settings */
227
228 dd->ctrl = val;
229
230 val = 0;
231 if (dd->dma_lch_out >= 0)
232 val |= AES_REG_MASK_DMA_OUT_EN;
233 if (dd->dma_lch_in >= 0)
234 val |= AES_REG_MASK_DMA_IN_EN;
235
236 mask = AES_REG_MASK_DMA_IN_EN | AES_REG_MASK_DMA_OUT_EN;
237
238 omap_aes_write_mask(dd, AES_REG_MASK, val, mask);
239
240 pr_debug("Set key\n");
241 key32 = dd->ctx->keylen / sizeof(u32);
242 /* set a key */
243 for (i = 0; i < key32; i++) {
244 omap_aes_write(dd, AES_REG_KEY(i),
245 __le32_to_cpu(dd->ctx->key[i]));
246 }
247 dd->ctx->flags &= ~FLAGS_NEW_KEY;
248
249 if (dd->flags & FLAGS_NEW_IV) {
250 pr_debug("Set IV\n");
251 omap_aes_write_n(dd, AES_REG_IV(0), dd->iv, 4);
252 dd->flags &= ~FLAGS_NEW_IV;
253 }
254
255 mask = AES_REG_CTRL_CBC | AES_REG_CTRL_DIRECTION |
256 AES_REG_CTRL_KEY_SIZE;
257
258 omap_aes_write_mask(dd, AES_REG_CTRL, dd->ctrl, mask);
259
260out:
261 /* start DMA or disable idle mode */
262 omap_aes_write_mask(dd, AES_REG_MASK, AES_REG_MASK_START,
263 AES_REG_MASK_START);
264}
265
266static struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_ctx *ctx)
267{
268 struct omap_aes_dev *dd = NULL, *tmp;
269
270 spin_lock_bh(&list_lock);
271 if (!ctx->dd) {
272 list_for_each_entry(tmp, &dev_list, list) {
273 /* FIXME: take fist available aes core */
274 dd = tmp;
275 break;
276 }
277 ctx->dd = dd;
278 } else {
279 /* already found before */
280 dd = ctx->dd;
281 }
282 spin_unlock_bh(&list_lock);
283
284 return dd;
285}
286
287static void omap_aes_dma_callback(int lch, u16 ch_status, void *data)
288{
289 struct omap_aes_dev *dd = data;
290
291 if (lch == dd->dma_lch_out)
292 tasklet_schedule(&dd->task);
293}
294
295static int omap_aes_dma_init(struct omap_aes_dev *dd)
296{
297 int err = -ENOMEM;
298
299 dd->dma_lch_out = -1;
300 dd->dma_lch_in = -1;
301
302 dd->buf_in = (void *)__get_free_pages(GFP_KERNEL, OMAP_AES_CACHE_SIZE);
303 dd->buf_out = (void *)__get_free_pages(GFP_KERNEL, OMAP_AES_CACHE_SIZE);
304 dd->buflen = PAGE_SIZE << OMAP_AES_CACHE_SIZE;
305 dd->buflen &= ~(AES_BLOCK_SIZE - 1);
306
307 if (!dd->buf_in || !dd->buf_out) {
308 dev_err(dd->dev, "unable to alloc pages.\n");
309 goto err_alloc;
310 }
311
312 /* MAP here */
313 dd->dma_addr_in = dma_map_single(dd->dev, dd->buf_in, dd->buflen,
314 DMA_TO_DEVICE);
315 if (dma_mapping_error(dd->dev, dd->dma_addr_in)) {
316 dev_err(dd->dev, "dma %d bytes error\n", dd->buflen);
317 err = -EINVAL;
318 goto err_map_in;
319 }
320
321 dd->dma_addr_out = dma_map_single(dd->dev, dd->buf_out, dd->buflen,
322 DMA_FROM_DEVICE);
323 if (dma_mapping_error(dd->dev, dd->dma_addr_out)) {
324 dev_err(dd->dev, "dma %d bytes error\n", dd->buflen);
325 err = -EINVAL;
326 goto err_map_out;
327 }
328
329 err = omap_request_dma(dd->dma_in, "omap-aes-rx",
330 omap_aes_dma_callback, dd, &dd->dma_lch_in);
331 if (err) {
332 dev_err(dd->dev, "Unable to request DMA channel\n");
333 goto err_dma_in;
334 }
335 err = omap_request_dma(dd->dma_out, "omap-aes-tx",
336 omap_aes_dma_callback, dd, &dd->dma_lch_out);
337 if (err) {
338 dev_err(dd->dev, "Unable to request DMA channel\n");
339 goto err_dma_out;
340 }
341
342 omap_set_dma_dest_params(dd->dma_lch_in, 0, OMAP_DMA_AMODE_CONSTANT,
343 dd->phys_base + AES_REG_DATA, 0, 4);
344
345 omap_set_dma_dest_burst_mode(dd->dma_lch_in, OMAP_DMA_DATA_BURST_4);
346 omap_set_dma_src_burst_mode(dd->dma_lch_in, OMAP_DMA_DATA_BURST_4);
347
348 omap_set_dma_src_params(dd->dma_lch_out, 0, OMAP_DMA_AMODE_CONSTANT,
349 dd->phys_base + AES_REG_DATA, 0, 4);
350
351 omap_set_dma_src_burst_mode(dd->dma_lch_out, OMAP_DMA_DATA_BURST_4);
352 omap_set_dma_dest_burst_mode(dd->dma_lch_out, OMAP_DMA_DATA_BURST_4);
353
354 return 0;
355
356err_dma_out:
357 omap_free_dma(dd->dma_lch_in);
358err_dma_in:
359 dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen,
360 DMA_FROM_DEVICE);
361err_map_out:
362 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen, DMA_TO_DEVICE);
363err_map_in:
364 free_pages((unsigned long)dd->buf_out, OMAP_AES_CACHE_SIZE);
365 free_pages((unsigned long)dd->buf_in, OMAP_AES_CACHE_SIZE);
366err_alloc:
367 if (err)
368 pr_err("error: %d\n", err);
369 return err;
370}
371
372static void omap_aes_dma_cleanup(struct omap_aes_dev *dd)
373{
374 omap_free_dma(dd->dma_lch_out);
375 omap_free_dma(dd->dma_lch_in);
376 dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen,
377 DMA_FROM_DEVICE);
378 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen, DMA_TO_DEVICE);
379 free_pages((unsigned long)dd->buf_out, OMAP_AES_CACHE_SIZE);
380 free_pages((unsigned long)dd->buf_in, OMAP_AES_CACHE_SIZE);
381}
382
383static void sg_copy_buf(void *buf, struct scatterlist *sg,
384 unsigned int start, unsigned int nbytes, int out)
385{
386 struct scatter_walk walk;
387
388 if (!nbytes)
389 return;
390
391 scatterwalk_start(&walk, sg);
392 scatterwalk_advance(&walk, start);
393 scatterwalk_copychunks(buf, &walk, nbytes, out);
394 scatterwalk_done(&walk, out, 0);
395}
396
397static int sg_copy(struct scatterlist **sg, size_t *offset, void *buf,
398 size_t buflen, size_t total, int out)
399{
400 unsigned int count, off = 0;
401
402 while (buflen && total) {
403 count = min((*sg)->length - *offset, total);
404 count = min(count, buflen);
405
406 if (!count)
407 return off;
408
409 sg_copy_buf(buf + off, *sg, *offset, count, out);
410
411 off += count;
412 buflen -= count;
413 *offset += count;
414 total -= count;
415
416 if (*offset == (*sg)->length) {
417 *sg = sg_next(*sg);
418 if (*sg)
419 *offset = 0;
420 else
421 total = 0;
422 }
423 }
424
425 return off;
426}
427
428static int omap_aes_crypt_dma(struct crypto_tfm *tfm, dma_addr_t dma_addr_in,
429 dma_addr_t dma_addr_out, int length)
430{
431 struct omap_aes_ctx *ctx = crypto_tfm_ctx(tfm);
432 struct omap_aes_dev *dd = ctx->dd;
433 int len32;
434
435 pr_debug("len: %d\n", length);
436
437 dd->dma_size = length;
438
439 if (!(dd->flags & FLAGS_FAST))
440 dma_sync_single_for_device(dd->dev, dma_addr_in, length,
441 DMA_TO_DEVICE);
442
443 len32 = DIV_ROUND_UP(length, sizeof(u32));
444
445 /* IN */
446 omap_set_dma_transfer_params(dd->dma_lch_in, OMAP_DMA_DATA_TYPE_S32,
447 len32, 1, OMAP_DMA_SYNC_PACKET, dd->dma_in,
448 OMAP_DMA_DST_SYNC);
449
450 omap_set_dma_src_params(dd->dma_lch_in, 0, OMAP_DMA_AMODE_POST_INC,
451 dma_addr_in, 0, 0);
452
453 /* OUT */
454 omap_set_dma_transfer_params(dd->dma_lch_out, OMAP_DMA_DATA_TYPE_S32,
455 len32, 1, OMAP_DMA_SYNC_PACKET,
456 dd->dma_out, OMAP_DMA_SRC_SYNC);
457
458 omap_set_dma_dest_params(dd->dma_lch_out, 0, OMAP_DMA_AMODE_POST_INC,
459 dma_addr_out, 0, 0);
460
461 omap_start_dma(dd->dma_lch_in);
462 omap_start_dma(dd->dma_lch_out);
463
464 omap_aes_write_ctrl(dd);
465
466 return 0;
467}
468
469static int omap_aes_crypt_dma_start(struct omap_aes_dev *dd)
470{
471 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(
472 crypto_ablkcipher_reqtfm(dd->req));
473 int err, fast = 0, in, out;
474 size_t count;
475 dma_addr_t addr_in, addr_out;
476
477 pr_debug("total: %d\n", dd->total);
478
479 if (sg_is_last(dd->in_sg) && sg_is_last(dd->out_sg)) {
480 /* check for alignment */
481 in = IS_ALIGNED((u32)dd->in_sg->offset, sizeof(u32));
482 out = IS_ALIGNED((u32)dd->out_sg->offset, sizeof(u32));
483
484 fast = in && out;
485 }
486
487 if (fast) {
488 count = min(dd->total, sg_dma_len(dd->in_sg));
489 count = min(count, sg_dma_len(dd->out_sg));
490
491 if (count != dd->total)
492 return -EINVAL;
493
494 pr_debug("fast\n");
495
496 err = dma_map_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
497 if (!err) {
498 dev_err(dd->dev, "dma_map_sg() error\n");
499 return -EINVAL;
500 }
501
502 err = dma_map_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
503 if (!err) {
504 dev_err(dd->dev, "dma_map_sg() error\n");
505 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
506 return -EINVAL;
507 }
508
509 addr_in = sg_dma_address(dd->in_sg);
510 addr_out = sg_dma_address(dd->out_sg);
511
512 dd->flags |= FLAGS_FAST;
513
514 } else {
515 /* use cache buffers */
516 count = sg_copy(&dd->in_sg, &dd->in_offset, dd->buf_in,
517 dd->buflen, dd->total, 0);
518
519 addr_in = dd->dma_addr_in;
520 addr_out = dd->dma_addr_out;
521
522 dd->flags &= ~FLAGS_FAST;
523
524 }
525
526 dd->total -= count;
527
528 err = omap_aes_hw_init(dd);
529
530 err = omap_aes_crypt_dma(tfm, addr_in, addr_out, count);
531
532 return err;
533}
534
535static void omap_aes_finish_req(struct omap_aes_dev *dd, int err)
536{
537 struct omap_aes_ctx *ctx;
538
539 pr_debug("err: %d\n", err);
540
541 ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(dd->req));
542
543 if (!dd->total)
544 dd->req->base.complete(&dd->req->base, err);
545}
546
547static int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd)
548{
549 int err = 0;
550 size_t count;
551
552 pr_debug("total: %d\n", dd->total);
553
554 omap_aes_write_mask(dd, AES_REG_MASK, 0, AES_REG_MASK_START);
555
556 omap_aes_hw_cleanup(dd);
557
558 omap_stop_dma(dd->dma_lch_in);
559 omap_stop_dma(dd->dma_lch_out);
560
561 if (dd->flags & FLAGS_FAST) {
562 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
563 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
564 } else {
565 dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
566 dd->dma_size, DMA_FROM_DEVICE);
567
568 /* copy data */
569 count = sg_copy(&dd->out_sg, &dd->out_offset, dd->buf_out,
570 dd->buflen, dd->dma_size, 1);
571 if (count != dd->dma_size) {
572 err = -EINVAL;
573 pr_err("not all data converted: %u\n", count);
574 }
575 }
576
577 if (err || !dd->total)
578 omap_aes_finish_req(dd, err);
579
580 return err;
581}
582
583static int omap_aes_handle_req(struct omap_aes_dev *dd)
584{
585 struct crypto_async_request *async_req, *backlog;
586 struct omap_aes_ctx *ctx;
587 struct omap_aes_reqctx *rctx;
588 struct ablkcipher_request *req;
589 unsigned long flags;
590
591 if (dd->total)
592 goto start;
593
594 spin_lock_irqsave(&dd->lock, flags);
595 backlog = crypto_get_backlog(&dd->queue);
596 async_req = crypto_dequeue_request(&dd->queue);
597 if (!async_req)
598 clear_bit(FLAGS_BUSY, &dd->flags);
599 spin_unlock_irqrestore(&dd->lock, flags);
600
601 if (!async_req)
602 return 0;
603
604 if (backlog)
605 backlog->complete(backlog, -EINPROGRESS);
606
607 req = ablkcipher_request_cast(async_req);
608
609 pr_debug("get new req\n");
610
611 /* assign new request to device */
612 dd->req = req;
613 dd->total = req->nbytes;
614 dd->in_offset = 0;
615 dd->in_sg = req->src;
616 dd->out_offset = 0;
617 dd->out_sg = req->dst;
618
619 rctx = ablkcipher_request_ctx(req);
620 ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
621 rctx->mode &= FLAGS_MODE_MASK;
622 dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
623
624 dd->iv = req->info;
625 if ((dd->flags & FLAGS_CBC) && dd->iv)
626 dd->flags |= FLAGS_NEW_IV;
627 else
628 dd->flags &= ~FLAGS_NEW_IV;
629
630 ctx->dd = dd;
631 if (dd->ctx != ctx) {
632 /* assign new context to device */
633 dd->ctx = ctx;
634 ctx->flags |= FLAGS_NEW_KEY;
635 }
636
637 if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE))
638 pr_err("request size is not exact amount of AES blocks\n");
639
640start:
641 return omap_aes_crypt_dma_start(dd);
642}
643
644static void omap_aes_task(unsigned long data)
645{
646 struct omap_aes_dev *dd = (struct omap_aes_dev *)data;
647 int err;
648
649 pr_debug("enter\n");
650
651 err = omap_aes_crypt_dma_stop(dd);
652
653 err = omap_aes_handle_req(dd);
654
655 pr_debug("exit\n");
656}
657
658static int omap_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
659{
660 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
661 crypto_ablkcipher_reqtfm(req));
662 struct omap_aes_reqctx *rctx = ablkcipher_request_ctx(req);
663 struct omap_aes_dev *dd;
664 unsigned long flags;
665 int err;
666
667 pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->nbytes,
668 !!(mode & FLAGS_ENCRYPT),
669 !!(mode & FLAGS_CBC));
670
671 dd = omap_aes_find_dev(ctx);
672 if (!dd)
673 return -ENODEV;
674
675 rctx->mode = mode;
676
677 spin_lock_irqsave(&dd->lock, flags);
678 err = ablkcipher_enqueue_request(&dd->queue, req);
679 spin_unlock_irqrestore(&dd->lock, flags);
680
681 if (!test_and_set_bit(FLAGS_BUSY, &dd->flags))
682 omap_aes_handle_req(dd);
683
684 pr_debug("exit\n");
685
686 return err;
687}
688
689/* ********************** ALG API ************************************ */
690
691static int omap_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
692 unsigned int keylen)
693{
694 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
695
696 if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
697 keylen != AES_KEYSIZE_256)
698 return -EINVAL;
699
700 pr_debug("enter, keylen: %d\n", keylen);
701
702 memcpy(ctx->key, key, keylen);
703 ctx->keylen = keylen;
704 ctx->flags |= FLAGS_NEW_KEY;
705
706 return 0;
707}
708
709static int omap_aes_ecb_encrypt(struct ablkcipher_request *req)
710{
711 return omap_aes_crypt(req, FLAGS_ENCRYPT);
712}
713
714static int omap_aes_ecb_decrypt(struct ablkcipher_request *req)
715{
716 return omap_aes_crypt(req, 0);
717}
718
719static int omap_aes_cbc_encrypt(struct ablkcipher_request *req)
720{
721 return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
722}
723
724static int omap_aes_cbc_decrypt(struct ablkcipher_request *req)
725{
726 return omap_aes_crypt(req, FLAGS_CBC);
727}
728
729static int omap_aes_cra_init(struct crypto_tfm *tfm)
730{
731 pr_debug("enter\n");
732
733 tfm->crt_ablkcipher.reqsize = sizeof(struct omap_aes_reqctx);
734
735 return 0;
736}
737
738static void omap_aes_cra_exit(struct crypto_tfm *tfm)
739{
740 pr_debug("enter\n");
741}
742
743/* ********************** ALGS ************************************ */
744
745static struct crypto_alg algs[] = {
746{
747 .cra_name = "ecb(aes)",
748 .cra_driver_name = "ecb-aes-omap",
749 .cra_priority = 100,
750 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
751 .cra_blocksize = AES_BLOCK_SIZE,
752 .cra_ctxsize = sizeof(struct omap_aes_ctx),
753 .cra_alignmask = 0,
754 .cra_type = &crypto_ablkcipher_type,
755 .cra_module = THIS_MODULE,
756 .cra_init = omap_aes_cra_init,
757 .cra_exit = omap_aes_cra_exit,
758 .cra_u.ablkcipher = {
759 .min_keysize = AES_MIN_KEY_SIZE,
760 .max_keysize = AES_MAX_KEY_SIZE,
761 .setkey = omap_aes_setkey,
762 .encrypt = omap_aes_ecb_encrypt,
763 .decrypt = omap_aes_ecb_decrypt,
764 }
765},
766{
767 .cra_name = "cbc(aes)",
768 .cra_driver_name = "cbc-aes-omap",
769 .cra_priority = 100,
770 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
771 .cra_blocksize = AES_BLOCK_SIZE,
772 .cra_ctxsize = sizeof(struct omap_aes_ctx),
773 .cra_alignmask = 0,
774 .cra_type = &crypto_ablkcipher_type,
775 .cra_module = THIS_MODULE,
776 .cra_init = omap_aes_cra_init,
777 .cra_exit = omap_aes_cra_exit,
778 .cra_u.ablkcipher = {
779 .min_keysize = AES_MIN_KEY_SIZE,
780 .max_keysize = AES_MAX_KEY_SIZE,
781 .ivsize = AES_BLOCK_SIZE,
782 .setkey = omap_aes_setkey,
783 .encrypt = omap_aes_cbc_encrypt,
784 .decrypt = omap_aes_cbc_decrypt,
785 }
786}
787};
788
789static int omap_aes_probe(struct platform_device *pdev)
790{
791 struct device *dev = &pdev->dev;
792 struct omap_aes_dev *dd;
793 struct resource *res;
794 int err = -ENOMEM, i, j;
795 u32 reg;
796
797 dd = kzalloc(sizeof(struct omap_aes_dev), GFP_KERNEL);
798 if (dd == NULL) {
799 dev_err(dev, "unable to alloc data struct.\n");
800 goto err_data;
801 }
802 dd->dev = dev;
803 platform_set_drvdata(pdev, dd);
804
805 spin_lock_init(&dd->lock);
806 crypto_init_queue(&dd->queue, OMAP_AES_QUEUE_LENGTH);
807
808 /* Get the base address */
809 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
810 if (!res) {
811 dev_err(dev, "invalid resource type\n");
812 err = -ENODEV;
813 goto err_res;
814 }
815 dd->phys_base = res->start;
816
817 /* Get the DMA */
818 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
819 if (!res)
820 dev_info(dev, "no DMA info\n");
821 else
822 dd->dma_out = res->start;
823
824 /* Get the DMA */
825 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
826 if (!res)
827 dev_info(dev, "no DMA info\n");
828 else
829 dd->dma_in = res->start;
830
831 /* Initializing the clock */
832 dd->iclk = clk_get(dev, "ick");
833 if (!dd->iclk) {
834 dev_err(dev, "clock intialization failed.\n");
835 err = -ENODEV;
836 goto err_res;
837 }
838
839 dd->io_base = ioremap(dd->phys_base, SZ_4K);
840 if (!dd->io_base) {
841 dev_err(dev, "can't ioremap\n");
842 err = -ENOMEM;
843 goto err_io;
844 }
845
846 clk_enable(dd->iclk);
847 reg = omap_aes_read(dd, AES_REG_REV);
848 dev_info(dev, "OMAP AES hw accel rev: %u.%u\n",
849 (reg & AES_REG_REV_MAJOR) >> 4, reg & AES_REG_REV_MINOR);
850 clk_disable(dd->iclk);
851
852 tasklet_init(&dd->task, omap_aes_task, (unsigned long)dd);
853
854 err = omap_aes_dma_init(dd);
855 if (err)
856 goto err_dma;
857
858 INIT_LIST_HEAD(&dd->list);
859 spin_lock(&list_lock);
860 list_add_tail(&dd->list, &dev_list);
861 spin_unlock(&list_lock);
862
863 for (i = 0; i < ARRAY_SIZE(algs); i++) {
864 pr_debug("i: %d\n", i);
865 INIT_LIST_HEAD(&algs[i].cra_list);
866 err = crypto_register_alg(&algs[i]);
867 if (err)
868 goto err_algs;
869 }
870
871 pr_info("probe() done\n");
872
873 return 0;
874err_algs:
875 for (j = 0; j < i; j++)
876 crypto_unregister_alg(&algs[j]);
877 omap_aes_dma_cleanup(dd);
878err_dma:
879 tasklet_kill(&dd->task);
880 iounmap(dd->io_base);
881err_io:
882 clk_put(dd->iclk);
883err_res:
884 kfree(dd);
885 dd = NULL;
886err_data:
887 dev_err(dev, "initialization failed.\n");
888 return err;
889}
890
891static int omap_aes_remove(struct platform_device *pdev)
892{
893 struct omap_aes_dev *dd = platform_get_drvdata(pdev);
894 int i;
895
896 if (!dd)
897 return -ENODEV;
898
899 spin_lock(&list_lock);
900 list_del(&dd->list);
901 spin_unlock(&list_lock);
902
903 for (i = 0; i < ARRAY_SIZE(algs); i++)
904 crypto_unregister_alg(&algs[i]);
905
906 tasklet_kill(&dd->task);
907 omap_aes_dma_cleanup(dd);
908 iounmap(dd->io_base);
909 clk_put(dd->iclk);
910 kfree(dd);
911 dd = NULL;
912
913 return 0;
914}
915
916static struct platform_driver omap_aes_driver = {
917 .probe = omap_aes_probe,
918 .remove = omap_aes_remove,
919 .driver = {
920 .name = "omap-aes",
921 .owner = THIS_MODULE,
922 },
923};
924
925static int __init omap_aes_mod_init(void)
926{
927 pr_info("loading %s driver\n", "omap-aes");
928
929 if (!cpu_class_is_omap2() || omap_type() != OMAP2_DEVICE_TYPE_SEC) {
930 pr_err("Unsupported cpu\n");
931 return -ENODEV;
932 }
933
934 return platform_driver_register(&omap_aes_driver);
935}
936
937static void __exit omap_aes_mod_exit(void)
938{
939 platform_driver_unregister(&omap_aes_driver);
940}
941
942module_init(omap_aes_mod_init);
943module_exit(omap_aes_mod_exit);
944
945MODULE_DESCRIPTION("OMAP AES hw acceleration support.");
946MODULE_LICENSE("GPL v2");
947MODULE_AUTHOR("Dmitry Kasatkin");
948
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-24 13:24:37 -0500