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Merge branch 'nfs-for-2.6.39' into nfs-for-next
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / crypto / omap-aes.c
blob5b970d9e99567219d69b22564b8287e1bcbc50d6
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_INIT BIT(4)
78 #define FLAGS_FAST BIT(5)
79 #define FLAGS_BUSY BIT(6)
80
81 struct omap_aes_ctx {
82 struct omap_aes_dev *dd;
83
84 int keylen;
85 u32 key[AES_KEYSIZE_256 / sizeof(u32)];
86 unsigned long flags;
87 };
88
89 struct omap_aes_reqctx {
90 unsigned long mode;
91 };
92
93 #define OMAP_AES_QUEUE_LENGTH 1
94 #define OMAP_AES_CACHE_SIZE 0
95
96 struct omap_aes_dev {
97 struct list_head list;
98 unsigned long phys_base;
99 void __iomem *io_base;
100 struct clk *iclk;
101 struct omap_aes_ctx *ctx;
102 struct device *dev;
103 unsigned long flags;
104 int err;
105
106 spinlock_t lock;
107 struct crypto_queue queue;
108
109 struct tasklet_struct done_task;
110 struct tasklet_struct queue_task;
111
112 struct ablkcipher_request *req;
113 size_t total;
114 struct scatterlist *in_sg;
115 size_t in_offset;
116 struct scatterlist *out_sg;
117 size_t out_offset;
118
119 size_t buflen;
120 void *buf_in;
121 size_t dma_size;
122 int dma_in;
123 int dma_lch_in;
124 dma_addr_t dma_addr_in;
125 void *buf_out;
126 int dma_out;
127 int dma_lch_out;
128 dma_addr_t dma_addr_out;
129 };
130
131 /* keep registered devices data here */
132 static LIST_HEAD(dev_list);
133 static DEFINE_SPINLOCK(list_lock);
134
135 static inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset)
136 {
137 return __raw_readl(dd->io_base + offset);
138 }
139
140 static inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset,
141 u32 value)
142 {
143 __raw_writel(value, dd->io_base + offset);
144 }
145
146 static inline void omap_aes_write_mask(struct omap_aes_dev *dd, u32 offset,
147 u32 value, u32 mask)
148 {
149 u32 val;
150
151 val = omap_aes_read(dd, offset);
152 val &= ~mask;
153 val |= value;
154 omap_aes_write(dd, offset, val);
155 }
156
157 static void omap_aes_write_n(struct omap_aes_dev *dd, u32 offset,
158 u32 *value, int count)
159 {
160 for (; count--; value++, offset += 4)
161 omap_aes_write(dd, offset, *value);
162 }
163
164 static int omap_aes_wait(struct omap_aes_dev *dd, u32 offset, u32 bit)
165 {
166 unsigned long timeout = jiffies + DEFAULT_TIMEOUT;
167
168 while (!(omap_aes_read(dd, offset) & bit)) {
169 if (time_is_before_jiffies(timeout)) {
170 dev_err(dd->dev, "omap-aes timeout\n");
171 return -ETIMEDOUT;
172 }
173 }
174 return 0;
175 }
176
177 static int omap_aes_hw_init(struct omap_aes_dev *dd)
178 {
179 /*
180 * clocks are enabled when request starts and disabled when finished.
181 * It may be long delays between requests.
182 * Device might go to off mode to save power.
183 */
184 clk_enable(dd->iclk);
185
186 if (!(dd->flags & FLAGS_INIT)) {
187 /* is it necessary to reset before every operation? */
188 omap_aes_write_mask(dd, AES_REG_MASK, AES_REG_MASK_SOFTRESET,
189 AES_REG_MASK_SOFTRESET);
190 /*
191 * prevent OCP bus error (SRESP) in case an access to the module
192 * is performed while the module is coming out of soft reset
193 */
194 __asm__ __volatile__("nop");
195 __asm__ __volatile__("nop");
196
197 if (omap_aes_wait(dd, AES_REG_SYSSTATUS,
198 AES_REG_SYSSTATUS_RESETDONE))
199 return -ETIMEDOUT;
200
201 dd->flags |= FLAGS_INIT;
202 dd->err = 0;
203 }
204
205 return 0;
206 }
207
208 static int omap_aes_write_ctrl(struct omap_aes_dev *dd)
209 {
210 unsigned int key32;
211 int i, err;
212 u32 val, mask;
213
214 err = omap_aes_hw_init(dd);
215 if (err)
216 return err;
217
218 val = 0;
219 if (dd->dma_lch_out >= 0)
220 val |= AES_REG_MASK_DMA_OUT_EN;
221 if (dd->dma_lch_in >= 0)
222 val |= AES_REG_MASK_DMA_IN_EN;
223
224 mask = AES_REG_MASK_DMA_IN_EN | AES_REG_MASK_DMA_OUT_EN;
225
226 omap_aes_write_mask(dd, AES_REG_MASK, val, mask);
227
228 key32 = dd->ctx->keylen / sizeof(u32);
229
230 /* it seems a key should always be set even if it has not changed */
231 for (i = 0; i < key32; i++) {
232 omap_aes_write(dd, AES_REG_KEY(i),
233 __le32_to_cpu(dd->ctx->key[i]));
234 }
235
236 if ((dd->flags & FLAGS_CBC) && dd->req->info)
237 omap_aes_write_n(dd, AES_REG_IV(0), dd->req->info, 4);
238
239 val = FLD_VAL(((dd->ctx->keylen >> 3) - 1), 4, 3);
240 if (dd->flags & FLAGS_CBC)
241 val |= AES_REG_CTRL_CBC;
242 if (dd->flags & FLAGS_ENCRYPT)
243 val |= AES_REG_CTRL_DIRECTION;
244
245 mask = AES_REG_CTRL_CBC | AES_REG_CTRL_DIRECTION |
246 AES_REG_CTRL_KEY_SIZE;
247
248 omap_aes_write_mask(dd, AES_REG_CTRL, val, mask);
249
250 /* IN */
251 omap_set_dma_dest_params(dd->dma_lch_in, 0, OMAP_DMA_AMODE_CONSTANT,
252 dd->phys_base + AES_REG_DATA, 0, 4);
253
254 omap_set_dma_dest_burst_mode(dd->dma_lch_in, OMAP_DMA_DATA_BURST_4);
255 omap_set_dma_src_burst_mode(dd->dma_lch_in, OMAP_DMA_DATA_BURST_4);
256
257 /* OUT */
258 omap_set_dma_src_params(dd->dma_lch_out, 0, OMAP_DMA_AMODE_CONSTANT,
259 dd->phys_base + AES_REG_DATA, 0, 4);
260
261 omap_set_dma_src_burst_mode(dd->dma_lch_out, OMAP_DMA_DATA_BURST_4);
262 omap_set_dma_dest_burst_mode(dd->dma_lch_out, OMAP_DMA_DATA_BURST_4);
263
264 return 0;
265 }
266
267 static struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_ctx *ctx)
268 {
269 struct omap_aes_dev *dd = NULL, *tmp;
270
271 spin_lock_bh(&list_lock);
272 if (!ctx->dd) {
273 list_for_each_entry(tmp, &dev_list, list) {
274 /* FIXME: take fist available aes core */
275 dd = tmp;
276 break;
277 }
278 ctx->dd = dd;
279 } else {
280 /* already found before */
281 dd = ctx->dd;
282 }
283 spin_unlock_bh(&list_lock);
284
285 return dd;
286 }
287
288 static void omap_aes_dma_callback(int lch, u16 ch_status, void *data)
289 {
290 struct omap_aes_dev *dd = data;
291
292 if (ch_status != OMAP_DMA_BLOCK_IRQ) {
293 pr_err("omap-aes DMA error status: 0x%hx\n", ch_status);
294 dd->err = -EIO;
295 dd->flags &= ~FLAGS_INIT; /* request to re-initialize */
296 } else if (lch == dd->dma_lch_in) {
297 return;
298 }
299
300 /* dma_lch_out - completed */
301 tasklet_schedule(&dd->done_task);
302 }
303
304 static int omap_aes_dma_init(struct omap_aes_dev *dd)
305 {
306 int err = -ENOMEM;
307
308 dd->dma_lch_out = -1;
309 dd->dma_lch_in = -1;
310
311 dd->buf_in = (void *)__get_free_pages(GFP_KERNEL, OMAP_AES_CACHE_SIZE);
312 dd->buf_out = (void *)__get_free_pages(GFP_KERNEL, OMAP_AES_CACHE_SIZE);
313 dd->buflen = PAGE_SIZE << OMAP_AES_CACHE_SIZE;
314 dd->buflen &= ~(AES_BLOCK_SIZE - 1);
315
316 if (!dd->buf_in || !dd->buf_out) {
317 dev_err(dd->dev, "unable to alloc pages.\n");
318 goto err_alloc;
319 }
320
321 /* MAP here */
322 dd->dma_addr_in = dma_map_single(dd->dev, dd->buf_in, dd->buflen,
323 DMA_TO_DEVICE);
324 if (dma_mapping_error(dd->dev, dd->dma_addr_in)) {
325 dev_err(dd->dev, "dma %d bytes error\n", dd->buflen);
326 err = -EINVAL;
327 goto err_map_in;
328 }
329
330 dd->dma_addr_out = dma_map_single(dd->dev, dd->buf_out, dd->buflen,
331 DMA_FROM_DEVICE);
332 if (dma_mapping_error(dd->dev, dd->dma_addr_out)) {
333 dev_err(dd->dev, "dma %d bytes error\n", dd->buflen);
334 err = -EINVAL;
335 goto err_map_out;
336 }
337
338 err = omap_request_dma(dd->dma_in, "omap-aes-rx",
339 omap_aes_dma_callback, dd, &dd->dma_lch_in);
340 if (err) {
341 dev_err(dd->dev, "Unable to request DMA channel\n");
342 goto err_dma_in;
343 }
344 err = omap_request_dma(dd->dma_out, "omap-aes-tx",
345 omap_aes_dma_callback, dd, &dd->dma_lch_out);
346 if (err) {
347 dev_err(dd->dev, "Unable to request DMA channel\n");
348 goto err_dma_out;
349 }
350
351 return 0;
352
353 err_dma_out:
354 omap_free_dma(dd->dma_lch_in);
355 err_dma_in:
356 dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen,
357 DMA_FROM_DEVICE);
358 err_map_out:
359 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen, DMA_TO_DEVICE);
360 err_map_in:
361 free_pages((unsigned long)dd->buf_out, OMAP_AES_CACHE_SIZE);
362 free_pages((unsigned long)dd->buf_in, OMAP_AES_CACHE_SIZE);
363 err_alloc:
364 if (err)
365 pr_err("error: %d\n", err);
366 return err;
367 }
368
369 static void omap_aes_dma_cleanup(struct omap_aes_dev *dd)
370 {
371 omap_free_dma(dd->dma_lch_out);
372 omap_free_dma(dd->dma_lch_in);
373 dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen,
374 DMA_FROM_DEVICE);
375 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen, DMA_TO_DEVICE);
376 free_pages((unsigned long)dd->buf_out, OMAP_AES_CACHE_SIZE);
377 free_pages((unsigned long)dd->buf_in, OMAP_AES_CACHE_SIZE);
378 }
379
380 static void sg_copy_buf(void *buf, struct scatterlist *sg,
381 unsigned int start, unsigned int nbytes, int out)
382 {
383 struct scatter_walk walk;
384
385 if (!nbytes)
386 return;
387
388 scatterwalk_start(&walk, sg);
389 scatterwalk_advance(&walk, start);
390 scatterwalk_copychunks(buf, &walk, nbytes, out);
391 scatterwalk_done(&walk, out, 0);
392 }
393
394 static int sg_copy(struct scatterlist **sg, size_t *offset, void *buf,
395 size_t buflen, size_t total, int out)
396 {
397 unsigned int count, off = 0;
398
399 while (buflen && total) {
400 count = min((*sg)->length - *offset, total);
401 count = min(count, buflen);
402
403 if (!count)
404 return off;
405
406 /*
407 * buflen and total are AES_BLOCK_SIZE size aligned,
408 * so count should be also aligned
409 */
410
411 sg_copy_buf(buf + off, *sg, *offset, count, out);
412
413 off += count;
414 buflen -= count;
415 *offset += count;
416 total -= count;
417
418 if (*offset == (*sg)->length) {
419 *sg = sg_next(*sg);
420 if (*sg)
421 *offset = 0;
422 else
423 total = 0;
424 }
425 }
426
427 return off;
428 }
429
430 static int omap_aes_crypt_dma(struct crypto_tfm *tfm, dma_addr_t dma_addr_in,
431 dma_addr_t dma_addr_out, int length)
432 {
433 struct omap_aes_ctx *ctx = crypto_tfm_ctx(tfm);
434 struct omap_aes_dev *dd = ctx->dd;
435 int len32;
436
437 pr_debug("len: %d\n", length);
438
439 dd->dma_size = length;
440
441 if (!(dd->flags & FLAGS_FAST))
442 dma_sync_single_for_device(dd->dev, dma_addr_in, length,
443 DMA_TO_DEVICE);
444
445 len32 = DIV_ROUND_UP(length, sizeof(u32));
446
447 /* IN */
448 omap_set_dma_transfer_params(dd->dma_lch_in, OMAP_DMA_DATA_TYPE_S32,
449 len32, 1, OMAP_DMA_SYNC_PACKET, dd->dma_in,
450 OMAP_DMA_DST_SYNC);
451
452 omap_set_dma_src_params(dd->dma_lch_in, 0, OMAP_DMA_AMODE_POST_INC,
453 dma_addr_in, 0, 0);
454
455 /* OUT */
456 omap_set_dma_transfer_params(dd->dma_lch_out, OMAP_DMA_DATA_TYPE_S32,
457 len32, 1, OMAP_DMA_SYNC_PACKET,
458 dd->dma_out, OMAP_DMA_SRC_SYNC);
459
460 omap_set_dma_dest_params(dd->dma_lch_out, 0, OMAP_DMA_AMODE_POST_INC,
461 dma_addr_out, 0, 0);
462
463 omap_start_dma(dd->dma_lch_in);
464 omap_start_dma(dd->dma_lch_out);
465
466 /* start DMA or disable idle mode */
467 omap_aes_write_mask(dd, AES_REG_MASK, AES_REG_MASK_START,
468 AES_REG_MASK_START);
469
470 return 0;
471 }
472
473 static int omap_aes_crypt_dma_start(struct omap_aes_dev *dd)
474 {
475 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(
476 crypto_ablkcipher_reqtfm(dd->req));
477 int err, fast = 0, in, out;
478 size_t count;
479 dma_addr_t addr_in, addr_out;
480
481 pr_debug("total: %d\n", dd->total);
482
483 if (sg_is_last(dd->in_sg) && sg_is_last(dd->out_sg)) {
484 /* check for alignment */
485 in = IS_ALIGNED((u32)dd->in_sg->offset, sizeof(u32));
486 out = IS_ALIGNED((u32)dd->out_sg->offset, sizeof(u32));
487
488 fast = in && out;
489 }
490
491 if (fast) {
492 count = min(dd->total, sg_dma_len(dd->in_sg));
493 count = min(count, sg_dma_len(dd->out_sg));
494
495 if (count != dd->total) {
496 pr_err("request length != buffer length\n");
497 return -EINVAL;
498 }
499
500 pr_debug("fast\n");
501
502 err = dma_map_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
503 if (!err) {
504 dev_err(dd->dev, "dma_map_sg() error\n");
505 return -EINVAL;
506 }
507
508 err = dma_map_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
509 if (!err) {
510 dev_err(dd->dev, "dma_map_sg() error\n");
511 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
512 return -EINVAL;
513 }
514
515 addr_in = sg_dma_address(dd->in_sg);
516 addr_out = sg_dma_address(dd->out_sg);
517
518 dd->flags |= FLAGS_FAST;
519
520 } else {
521 /* use cache buffers */
522 count = sg_copy(&dd->in_sg, &dd->in_offset, dd->buf_in,
523 dd->buflen, dd->total, 0);
524
525 addr_in = dd->dma_addr_in;
526 addr_out = dd->dma_addr_out;
527
528 dd->flags &= ~FLAGS_FAST;
529
530 }
531
532 dd->total -= count;
533
534 err = omap_aes_crypt_dma(tfm, addr_in, addr_out, count);
535 if (err) {
536 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
537 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_TO_DEVICE);
538 }
539
540 return err;
541 }
542
543 static void omap_aes_finish_req(struct omap_aes_dev *dd, int err)
544 {
545 struct ablkcipher_request *req = dd->req;
546
547 pr_debug("err: %d\n", err);
548
549 clk_disable(dd->iclk);
550 dd->flags &= ~FLAGS_BUSY;
551
552 req->base.complete(&req->base, err);
553 }
554
555 static int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd)
556 {
557 int err = 0;
558 size_t count;
559
560 pr_debug("total: %d\n", dd->total);
561
562 omap_aes_write_mask(dd, AES_REG_MASK, 0, AES_REG_MASK_START);
563
564 omap_stop_dma(dd->dma_lch_in);
565 omap_stop_dma(dd->dma_lch_out);
566
567 if (dd->flags & FLAGS_FAST) {
568 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
569 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
570 } else {
571 dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
572 dd->dma_size, DMA_FROM_DEVICE);
573
574 /* copy data */
575 count = sg_copy(&dd->out_sg, &dd->out_offset, dd->buf_out,
576 dd->buflen, dd->dma_size, 1);
577 if (count != dd->dma_size) {
578 err = -EINVAL;
579 pr_err("not all data converted: %u\n", count);
580 }
581 }
582
583 return err;
584 }
585
586 static int omap_aes_handle_queue(struct omap_aes_dev *dd,
587 struct ablkcipher_request *req)
588 {
589 struct crypto_async_request *async_req, *backlog;
590 struct omap_aes_ctx *ctx;
591 struct omap_aes_reqctx *rctx;
592 unsigned long flags;
593 int err, ret = 0;
594
595 spin_lock_irqsave(&dd->lock, flags);
596 if (req)
597 ret = ablkcipher_enqueue_request(&dd->queue, req);
598 if (dd->flags & FLAGS_BUSY) {
599 spin_unlock_irqrestore(&dd->lock, flags);
600 return ret;
601 }
602 backlog = crypto_get_backlog(&dd->queue);
603 async_req = crypto_dequeue_request(&dd->queue);
604 if (async_req)
605 dd->flags |= FLAGS_BUSY;
606 spin_unlock_irqrestore(&dd->lock, flags);
607
608 if (!async_req)
609 return ret;
610
611 if (backlog)
612 backlog->complete(backlog, -EINPROGRESS);
613
614 req = ablkcipher_request_cast(async_req);
615
616 /* assign new request to device */
617 dd->req = req;
618 dd->total = req->nbytes;
619 dd->in_offset = 0;
620 dd->in_sg = req->src;
621 dd->out_offset = 0;
622 dd->out_sg = req->dst;
623
624 rctx = ablkcipher_request_ctx(req);
625 ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
626 rctx->mode &= FLAGS_MODE_MASK;
627 dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
628
629 dd->ctx = ctx;
630 ctx->dd = dd;
631
632 err = omap_aes_write_ctrl(dd);
633 if (!err)
634 err = omap_aes_crypt_dma_start(dd);
635 if (err) {
636 /* aes_task will not finish it, so do it here */
637 omap_aes_finish_req(dd, err);
638 tasklet_schedule(&dd->queue_task);
639 }
640
641 return ret; /* return ret, which is enqueue return value */
642 }
643
644 static void omap_aes_done_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 = dd->err ? : err;
654
655 if (dd->total && !err) {
656 err = omap_aes_crypt_dma_start(dd);
657 if (!err)
658 return; /* DMA started. Not fininishing. */
659 }
660
661 omap_aes_finish_req(dd, err);
662 omap_aes_handle_queue(dd, NULL);
663
664 pr_debug("exit\n");
665 }
666
667 static void omap_aes_queue_task(unsigned long data)
668 {
669 struct omap_aes_dev *dd = (struct omap_aes_dev *)data;
670
671 omap_aes_handle_queue(dd, NULL);
672 }
673
674 static int omap_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
675 {
676 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
677 crypto_ablkcipher_reqtfm(req));
678 struct omap_aes_reqctx *rctx = ablkcipher_request_ctx(req);
679 struct omap_aes_dev *dd;
680
681 pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->nbytes,
682 !!(mode & FLAGS_ENCRYPT),
683 !!(mode & FLAGS_CBC));
684
685 if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE)) {
686 pr_err("request size is not exact amount of AES blocks\n");
687 return -EINVAL;
688 }
689
690 dd = omap_aes_find_dev(ctx);
691 if (!dd)
692 return -ENODEV;
693
694 rctx->mode = mode;
695
696 return omap_aes_handle_queue(dd, req);
697 }
698
699 /* ********************** ALG API ************************************ */
700
701 static int omap_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
702 unsigned int keylen)
703 {
704 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
705
706 if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
707 keylen != AES_KEYSIZE_256)
708 return -EINVAL;
709
710 pr_debug("enter, keylen: %d\n", keylen);
711
712 memcpy(ctx->key, key, keylen);
713 ctx->keylen = keylen;
714
715 return 0;
716 }
717
718 static int omap_aes_ecb_encrypt(struct ablkcipher_request *req)
719 {
720 return omap_aes_crypt(req, FLAGS_ENCRYPT);
721 }
722
723 static int omap_aes_ecb_decrypt(struct ablkcipher_request *req)
724 {
725 return omap_aes_crypt(req, 0);
726 }
727
728 static int omap_aes_cbc_encrypt(struct ablkcipher_request *req)
729 {
730 return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
731 }
732
733 static int omap_aes_cbc_decrypt(struct ablkcipher_request *req)
734 {
735 return omap_aes_crypt(req, FLAGS_CBC);
736 }
737
738 static int omap_aes_cra_init(struct crypto_tfm *tfm)
739 {
740 pr_debug("enter\n");
741
742 tfm->crt_ablkcipher.reqsize = sizeof(struct omap_aes_reqctx);
743
744 return 0;
745 }
746
747 static void omap_aes_cra_exit(struct crypto_tfm *tfm)
748 {
749 pr_debug("enter\n");
750 }
751
752 /* ********************** ALGS ************************************ */
753
754 static struct crypto_alg algs[] = {
755 {
756 .cra_name = "ecb(aes)",
757 .cra_driver_name = "ecb-aes-omap",
758 .cra_priority = 100,
759 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
760 .cra_blocksize = AES_BLOCK_SIZE,
761 .cra_ctxsize = sizeof(struct omap_aes_ctx),
762 .cra_alignmask = 0,
763 .cra_type = &crypto_ablkcipher_type,
764 .cra_module = THIS_MODULE,
765 .cra_init = omap_aes_cra_init,
766 .cra_exit = omap_aes_cra_exit,
767 .cra_u.ablkcipher = {
768 .min_keysize = AES_MIN_KEY_SIZE,
769 .max_keysize = AES_MAX_KEY_SIZE,
770 .setkey = omap_aes_setkey,
771 .encrypt = omap_aes_ecb_encrypt,
772 .decrypt = omap_aes_ecb_decrypt,
773 }
774 },
775 {
776 .cra_name = "cbc(aes)",
777 .cra_driver_name = "cbc-aes-omap",
778 .cra_priority = 100,
779 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
780 .cra_blocksize = AES_BLOCK_SIZE,
781 .cra_ctxsize = sizeof(struct omap_aes_ctx),
782 .cra_alignmask = 0,
783 .cra_type = &crypto_ablkcipher_type,
784 .cra_module = THIS_MODULE,
785 .cra_init = omap_aes_cra_init,
786 .cra_exit = omap_aes_cra_exit,
787 .cra_u.ablkcipher = {
788 .min_keysize = AES_MIN_KEY_SIZE,
789 .max_keysize = AES_MAX_KEY_SIZE,
790 .ivsize = AES_BLOCK_SIZE,
791 .setkey = omap_aes_setkey,
792 .encrypt = omap_aes_cbc_encrypt,
793 .decrypt = omap_aes_cbc_decrypt,
794 }
795 }
796 };
797
798 static int omap_aes_probe(struct platform_device *pdev)
799 {
800 struct device *dev = &pdev->dev;
801 struct omap_aes_dev *dd;
802 struct resource *res;
803 int err = -ENOMEM, i, j;
804 u32 reg;
805
806 dd = kzalloc(sizeof(struct omap_aes_dev), GFP_KERNEL);
807 if (dd == NULL) {
808 dev_err(dev, "unable to alloc data struct.\n");
809 goto err_data;
810 }
811 dd->dev = dev;
812 platform_set_drvdata(pdev, dd);
813
814 spin_lock_init(&dd->lock);
815 crypto_init_queue(&dd->queue, OMAP_AES_QUEUE_LENGTH);
816
817 /* Get the base address */
818 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
819 if (!res) {
820 dev_err(dev, "invalid resource type\n");
821 err = -ENODEV;
822 goto err_res;
823 }
824 dd->phys_base = res->start;
825
826 /* Get the DMA */
827 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
828 if (!res)
829 dev_info(dev, "no DMA info\n");
830 else
831 dd->dma_out = res->start;
832
833 /* Get the DMA */
834 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
835 if (!res)
836 dev_info(dev, "no DMA info\n");
837 else
838 dd->dma_in = res->start;
839
840 /* Initializing the clock */
841 dd->iclk = clk_get(dev, "ick");
842 if (IS_ERR(dd->iclk)) {
843 dev_err(dev, "clock intialization failed.\n");
844 err = PTR_ERR(dd->iclk);
845 goto err_res;
846 }
847
848 dd->io_base = ioremap(dd->phys_base, SZ_4K);
849 if (!dd->io_base) {
850 dev_err(dev, "can't ioremap\n");
851 err = -ENOMEM;
852 goto err_io;
853 }
854
855 clk_enable(dd->iclk);
856 reg = omap_aes_read(dd, AES_REG_REV);
857 dev_info(dev, "OMAP AES hw accel rev: %u.%u\n",
858 (reg & AES_REG_REV_MAJOR) >> 4, reg & AES_REG_REV_MINOR);
859 clk_disable(dd->iclk);
860
861 tasklet_init(&dd->done_task, omap_aes_done_task, (unsigned long)dd);
862 tasklet_init(&dd->queue_task, omap_aes_queue_task, (unsigned long)dd);
863
864 err = omap_aes_dma_init(dd);
865 if (err)
866 goto err_dma;
867
868 INIT_LIST_HEAD(&dd->list);
869 spin_lock(&list_lock);
870 list_add_tail(&dd->list, &dev_list);
871 spin_unlock(&list_lock);
872
873 for (i = 0; i < ARRAY_SIZE(algs); i++) {
874 pr_debug("i: %d\n", i);
875 INIT_LIST_HEAD(&algs[i].cra_list);
876 err = crypto_register_alg(&algs[i]);
877 if (err)
878 goto err_algs;
879 }
880
881 pr_info("probe() done\n");
882
883 return 0;
884 err_algs:
885 for (j = 0; j < i; j++)
886 crypto_unregister_alg(&algs[j]);
887 omap_aes_dma_cleanup(dd);
888 err_dma:
889 tasklet_kill(&dd->done_task);
890 tasklet_kill(&dd->queue_task);
891 iounmap(dd->io_base);
892 err_io:
893 clk_put(dd->iclk);
894 err_res:
895 kfree(dd);
896 dd = NULL;
897 err_data:
898 dev_err(dev, "initialization failed.\n");
899 return err;
900 }
901
902 static int omap_aes_remove(struct platform_device *pdev)
903 {
904 struct omap_aes_dev *dd = platform_get_drvdata(pdev);
905 int i;
906
907 if (!dd)
908 return -ENODEV;
909
910 spin_lock(&list_lock);
911 list_del(&dd->list);
912 spin_unlock(&list_lock);
913
914 for (i = 0; i < ARRAY_SIZE(algs); i++)
915 crypto_unregister_alg(&algs[i]);
916
917 tasklet_kill(&dd->done_task);
918 tasklet_kill(&dd->queue_task);
919 omap_aes_dma_cleanup(dd);
920 iounmap(dd->io_base);
921 clk_put(dd->iclk);
922 kfree(dd);
923 dd = NULL;
924
925 return 0;
926 }
927
928 static struct platform_driver omap_aes_driver = {
929 .probe = omap_aes_probe,
930 .remove = omap_aes_remove,
931 .driver = {
932 .name = "omap-aes",
933 .owner = THIS_MODULE,
934 },
935 };
936
937 static int __init omap_aes_mod_init(void)
938 {
939 pr_info("loading %s driver\n", "omap-aes");
940
941 if (!cpu_class_is_omap2() || omap_type() != OMAP2_DEVICE_TYPE_SEC) {
942 pr_err("Unsupported cpu\n");
943 return -ENODEV;
944 }
945
946 return platform_driver_register(&omap_aes_driver);
947 }
948
949 static void __exit omap_aes_mod_exit(void)
950 {
951 platform_driver_unregister(&omap_aes_driver);
952 }
953
954 module_init(omap_aes_mod_init);
955 module_exit(omap_aes_mod_exit);
956
957 MODULE_DESCRIPTION("OMAP AES hw acceleration support.");
958 MODULE_LICENSE("GPL v2");
959 MODULE_AUTHOR("Dmitry Kasatkin");
960
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