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ext4: allow readdir()'s of large empty directories to be interrupted
[linux/fpc-iii.git] / drivers / crypto / omap-aes.c
blobd420ec751c7c9e090710f568f9b4370591c09110
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/omap-dma.h>
30 #include <linux/pm_runtime.h>
31 #include <linux/of.h>
32 #include <linux/of_device.h>
33 #include <linux/of_address.h>
34 #include <linux/io.h>
35 #include <linux/crypto.h>
36 #include <linux/interrupt.h>
37 #include <crypto/scatterwalk.h>
38 #include <crypto/aes.h>
39 #include <crypto/algapi.h>
40
41 #define DST_MAXBURST 4
42 #define DMA_MIN (DST_MAXBURST * sizeof(u32))
43
44 #define _calc_walked(inout) (dd->inout##_walk.offset - dd->inout##_sg->offset)
45
46 /* OMAP TRM gives bitfields as start:end, where start is the higher bit
47 number. For example 7:0 */
48 #define FLD_MASK(start, end) (((1 << ((start) - (end) + 1)) - 1) << (end))
49 #define FLD_VAL(val, start, end) (((val) << (end)) & FLD_MASK(start, end))
50
51 #define AES_REG_KEY(dd, x) ((dd)->pdata->key_ofs - \
52 ((x ^ 0x01) * 0x04))
53 #define AES_REG_IV(dd, x) ((dd)->pdata->iv_ofs + ((x) * 0x04))
54
55 #define AES_REG_CTRL(dd) ((dd)->pdata->ctrl_ofs)
56 #define AES_REG_CTRL_CTR_WIDTH_MASK GENMASK(8, 7)
57 #define AES_REG_CTRL_CTR_WIDTH_32 0
58 #define AES_REG_CTRL_CTR_WIDTH_64 BIT(7)
59 #define AES_REG_CTRL_CTR_WIDTH_96 BIT(8)
60 #define AES_REG_CTRL_CTR_WIDTH_128 GENMASK(8, 7)
61 #define AES_REG_CTRL_CTR BIT(6)
62 #define AES_REG_CTRL_CBC BIT(5)
63 #define AES_REG_CTRL_KEY_SIZE GENMASK(4, 3)
64 #define AES_REG_CTRL_DIRECTION BIT(2)
65 #define AES_REG_CTRL_INPUT_READY BIT(1)
66 #define AES_REG_CTRL_OUTPUT_READY BIT(0)
67 #define AES_REG_CTRL_MASK GENMASK(24, 2)
68
69 #define AES_REG_DATA_N(dd, x) ((dd)->pdata->data_ofs + ((x) * 0x04))
70
71 #define AES_REG_REV(dd) ((dd)->pdata->rev_ofs)
72
73 #define AES_REG_MASK(dd) ((dd)->pdata->mask_ofs)
74 #define AES_REG_MASK_SIDLE BIT(6)
75 #define AES_REG_MASK_START BIT(5)
76 #define AES_REG_MASK_DMA_OUT_EN BIT(3)
77 #define AES_REG_MASK_DMA_IN_EN BIT(2)
78 #define AES_REG_MASK_SOFTRESET BIT(1)
79 #define AES_REG_AUTOIDLE BIT(0)
80
81 #define AES_REG_LENGTH_N(x) (0x54 + ((x) * 0x04))
82
83 #define AES_REG_IRQ_STATUS(dd) ((dd)->pdata->irq_status_ofs)
84 #define AES_REG_IRQ_ENABLE(dd) ((dd)->pdata->irq_enable_ofs)
85 #define AES_REG_IRQ_DATA_IN BIT(1)
86 #define AES_REG_IRQ_DATA_OUT BIT(2)
87 #define DEFAULT_TIMEOUT (5*HZ)
88
89 #define FLAGS_MODE_MASK 0x000f
90 #define FLAGS_ENCRYPT BIT(0)
91 #define FLAGS_CBC BIT(1)
92 #define FLAGS_GIV BIT(2)
93 #define FLAGS_CTR BIT(3)
94
95 #define FLAGS_INIT BIT(4)
96 #define FLAGS_FAST BIT(5)
97 #define FLAGS_BUSY BIT(6)
98
99 #define AES_BLOCK_WORDS (AES_BLOCK_SIZE >> 2)
100
101 struct omap_aes_ctx {
102 struct omap_aes_dev *dd;
103
104 int keylen;
105 u32 key[AES_KEYSIZE_256 / sizeof(u32)];
106 unsigned long flags;
107 };
108
109 struct omap_aes_reqctx {
110 unsigned long mode;
111 };
112
113 #define OMAP_AES_QUEUE_LENGTH 1
114 #define OMAP_AES_CACHE_SIZE 0
115
116 struct omap_aes_algs_info {
117 struct crypto_alg *algs_list;
118 unsigned int size;
119 unsigned int registered;
120 };
121
122 struct omap_aes_pdata {
123 struct omap_aes_algs_info *algs_info;
124 unsigned int algs_info_size;
125
126 void (*trigger)(struct omap_aes_dev *dd, int length);
127
128 u32 key_ofs;
129 u32 iv_ofs;
130 u32 ctrl_ofs;
131 u32 data_ofs;
132 u32 rev_ofs;
133 u32 mask_ofs;
134 u32 irq_enable_ofs;
135 u32 irq_status_ofs;
136
137 u32 dma_enable_in;
138 u32 dma_enable_out;
139 u32 dma_start;
140
141 u32 major_mask;
142 u32 major_shift;
143 u32 minor_mask;
144 u32 minor_shift;
145 };
146
147 struct omap_aes_dev {
148 struct list_head list;
149 unsigned long phys_base;
150 void __iomem *io_base;
151 struct omap_aes_ctx *ctx;
152 struct device *dev;
153 unsigned long flags;
154 int err;
155
156 struct tasklet_struct done_task;
157
158 struct ablkcipher_request *req;
159 struct crypto_engine *engine;
160
161 /*
162 * total is used by PIO mode for book keeping so introduce
163 * variable total_save as need it to calc page_order
164 */
165 size_t total;
166 size_t total_save;
167
168 struct scatterlist *in_sg;
169 struct scatterlist *out_sg;
170
171 /* Buffers for copying for unaligned cases */
172 struct scatterlist in_sgl;
173 struct scatterlist out_sgl;
174 struct scatterlist *orig_out;
175 int sgs_copied;
176
177 struct scatter_walk in_walk;
178 struct scatter_walk out_walk;
179 int dma_in;
180 struct dma_chan *dma_lch_in;
181 int dma_out;
182 struct dma_chan *dma_lch_out;
183 int in_sg_len;
184 int out_sg_len;
185 int pio_only;
186 const struct omap_aes_pdata *pdata;
187 };
188
189 /* keep registered devices data here */
190 static LIST_HEAD(dev_list);
191 static DEFINE_SPINLOCK(list_lock);
192
193 #ifdef DEBUG
194 #define omap_aes_read(dd, offset) \
195 ({ \
196 int _read_ret; \
197 _read_ret = __raw_readl(dd->io_base + offset); \
198 pr_debug("omap_aes_read(" #offset "=%#x)= %#x\n", \
199 offset, _read_ret); \
200 _read_ret; \
201 })
202 #else
203 static inline u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset)
204 {
205 return __raw_readl(dd->io_base + offset);
206 }
207 #endif
208
209 #ifdef DEBUG
210 #define omap_aes_write(dd, offset, value) \
211 do { \
212 pr_debug("omap_aes_write(" #offset "=%#x) value=%#x\n", \
213 offset, value); \
214 __raw_writel(value, dd->io_base + offset); \
215 } while (0)
216 #else
217 static inline void omap_aes_write(struct omap_aes_dev *dd, u32 offset,
218 u32 value)
219 {
220 __raw_writel(value, dd->io_base + offset);
221 }
222 #endif
223
224 static inline void omap_aes_write_mask(struct omap_aes_dev *dd, u32 offset,
225 u32 value, u32 mask)
226 {
227 u32 val;
228
229 val = omap_aes_read(dd, offset);
230 val &= ~mask;
231 val |= value;
232 omap_aes_write(dd, offset, val);
233 }
234
235 static void omap_aes_write_n(struct omap_aes_dev *dd, u32 offset,
236 u32 *value, int count)
237 {
238 for (; count--; value++, offset += 4)
239 omap_aes_write(dd, offset, *value);
240 }
241
242 static int omap_aes_hw_init(struct omap_aes_dev *dd)
243 {
244 if (!(dd->flags & FLAGS_INIT)) {
245 dd->flags |= FLAGS_INIT;
246 dd->err = 0;
247 }
248
249 return 0;
250 }
251
252 static int omap_aes_write_ctrl(struct omap_aes_dev *dd)
253 {
254 unsigned int key32;
255 int i, err;
256 u32 val;
257
258 err = omap_aes_hw_init(dd);
259 if (err)
260 return err;
261
262 key32 = dd->ctx->keylen / sizeof(u32);
263
264 /* it seems a key should always be set even if it has not changed */
265 for (i = 0; i < key32; i++) {
266 omap_aes_write(dd, AES_REG_KEY(dd, i),
267 __le32_to_cpu(dd->ctx->key[i]));
268 }
269
270 if ((dd->flags & (FLAGS_CBC | FLAGS_CTR)) && dd->req->info)
271 omap_aes_write_n(dd, AES_REG_IV(dd, 0), dd->req->info, 4);
272
273 val = FLD_VAL(((dd->ctx->keylen >> 3) - 1), 4, 3);
274 if (dd->flags & FLAGS_CBC)
275 val |= AES_REG_CTRL_CBC;
276 if (dd->flags & FLAGS_CTR)
277 val |= AES_REG_CTRL_CTR | AES_REG_CTRL_CTR_WIDTH_128;
278
279 if (dd->flags & FLAGS_ENCRYPT)
280 val |= AES_REG_CTRL_DIRECTION;
281
282 omap_aes_write_mask(dd, AES_REG_CTRL(dd), val, AES_REG_CTRL_MASK);
283
284 return 0;
285 }
286
287 static void omap_aes_dma_trigger_omap2(struct omap_aes_dev *dd, int length)
288 {
289 u32 mask, val;
290
291 val = dd->pdata->dma_start;
292
293 if (dd->dma_lch_out != NULL)
294 val |= dd->pdata->dma_enable_out;
295 if (dd->dma_lch_in != NULL)
296 val |= dd->pdata->dma_enable_in;
297
298 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
299 dd->pdata->dma_start;
300
301 omap_aes_write_mask(dd, AES_REG_MASK(dd), val, mask);
302
303 }
304
305 static void omap_aes_dma_trigger_omap4(struct omap_aes_dev *dd, int length)
306 {
307 omap_aes_write(dd, AES_REG_LENGTH_N(0), length);
308 omap_aes_write(dd, AES_REG_LENGTH_N(1), 0);
309
310 omap_aes_dma_trigger_omap2(dd, length);
311 }
312
313 static void omap_aes_dma_stop(struct omap_aes_dev *dd)
314 {
315 u32 mask;
316
317 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
318 dd->pdata->dma_start;
319
320 omap_aes_write_mask(dd, AES_REG_MASK(dd), 0, mask);
321 }
322
323 static struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_ctx *ctx)
324 {
325 struct omap_aes_dev *dd = NULL, *tmp;
326
327 spin_lock_bh(&list_lock);
328 if (!ctx->dd) {
329 list_for_each_entry(tmp, &dev_list, list) {
330 /* FIXME: take fist available aes core */
331 dd = tmp;
332 break;
333 }
334 ctx->dd = dd;
335 } else {
336 /* already found before */
337 dd = ctx->dd;
338 }
339 spin_unlock_bh(&list_lock);
340
341 return dd;
342 }
343
344 static void omap_aes_dma_out_callback(void *data)
345 {
346 struct omap_aes_dev *dd = data;
347
348 /* dma_lch_out - completed */
349 tasklet_schedule(&dd->done_task);
350 }
351
352 static int omap_aes_dma_init(struct omap_aes_dev *dd)
353 {
354 int err = -ENOMEM;
355 dma_cap_mask_t mask;
356
357 dd->dma_lch_out = NULL;
358 dd->dma_lch_in = NULL;
359
360 dma_cap_zero(mask);
361 dma_cap_set(DMA_SLAVE, mask);
362
363 dd->dma_lch_in = dma_request_slave_channel_compat(mask,
364 omap_dma_filter_fn,
365 &dd->dma_in,
366 dd->dev, "rx");
367 if (!dd->dma_lch_in) {
368 dev_err(dd->dev, "Unable to request in DMA channel\n");
369 goto err_dma_in;
370 }
371
372 dd->dma_lch_out = dma_request_slave_channel_compat(mask,
373 omap_dma_filter_fn,
374 &dd->dma_out,
375 dd->dev, "tx");
376 if (!dd->dma_lch_out) {
377 dev_err(dd->dev, "Unable to request out DMA channel\n");
378 goto err_dma_out;
379 }
380
381 return 0;
382
383 err_dma_out:
384 dma_release_channel(dd->dma_lch_in);
385 err_dma_in:
386 if (err)
387 pr_err("error: %d\n", err);
388 return err;
389 }
390
391 static void omap_aes_dma_cleanup(struct omap_aes_dev *dd)
392 {
393 dma_release_channel(dd->dma_lch_out);
394 dma_release_channel(dd->dma_lch_in);
395 }
396
397 static void sg_copy_buf(void *buf, struct scatterlist *sg,
398 unsigned int start, unsigned int nbytes, int out)
399 {
400 struct scatter_walk walk;
401
402 if (!nbytes)
403 return;
404
405 scatterwalk_start(&walk, sg);
406 scatterwalk_advance(&walk, start);
407 scatterwalk_copychunks(buf, &walk, nbytes, out);
408 scatterwalk_done(&walk, out, 0);
409 }
410
411 static int omap_aes_crypt_dma(struct crypto_tfm *tfm,
412 struct scatterlist *in_sg, struct scatterlist *out_sg,
413 int in_sg_len, int out_sg_len)
414 {
415 struct omap_aes_ctx *ctx = crypto_tfm_ctx(tfm);
416 struct omap_aes_dev *dd = ctx->dd;
417 struct dma_async_tx_descriptor *tx_in, *tx_out;
418 struct dma_slave_config cfg;
419 int ret;
420
421 if (dd->pio_only) {
422 scatterwalk_start(&dd->in_walk, dd->in_sg);
423 scatterwalk_start(&dd->out_walk, dd->out_sg);
424
425 /* Enable DATAIN interrupt and let it take
426 care of the rest */
427 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
428 return 0;
429 }
430
431 dma_sync_sg_for_device(dd->dev, dd->in_sg, in_sg_len, DMA_TO_DEVICE);
432
433 memset(&cfg, 0, sizeof(cfg));
434
435 cfg.src_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
436 cfg.dst_addr = dd->phys_base + AES_REG_DATA_N(dd, 0);
437 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
438 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
439 cfg.src_maxburst = DST_MAXBURST;
440 cfg.dst_maxburst = DST_MAXBURST;
441
442 /* IN */
443 ret = dmaengine_slave_config(dd->dma_lch_in, &cfg);
444 if (ret) {
445 dev_err(dd->dev, "can't configure IN dmaengine slave: %d\n",
446 ret);
447 return ret;
448 }
449
450 tx_in = dmaengine_prep_slave_sg(dd->dma_lch_in, in_sg, in_sg_len,
451 DMA_MEM_TO_DEV,
452 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
453 if (!tx_in) {
454 dev_err(dd->dev, "IN prep_slave_sg() failed\n");
455 return -EINVAL;
456 }
457
458 /* No callback necessary */
459 tx_in->callback_param = dd;
460
461 /* OUT */
462 ret = dmaengine_slave_config(dd->dma_lch_out, &cfg);
463 if (ret) {
464 dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n",
465 ret);
466 return ret;
467 }
468
469 tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg, out_sg_len,
470 DMA_DEV_TO_MEM,
471 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
472 if (!tx_out) {
473 dev_err(dd->dev, "OUT prep_slave_sg() failed\n");
474 return -EINVAL;
475 }
476
477 tx_out->callback = omap_aes_dma_out_callback;
478 tx_out->callback_param = dd;
479
480 dmaengine_submit(tx_in);
481 dmaengine_submit(tx_out);
482
483 dma_async_issue_pending(dd->dma_lch_in);
484 dma_async_issue_pending(dd->dma_lch_out);
485
486 /* start DMA */
487 dd->pdata->trigger(dd, dd->total);
488
489 return 0;
490 }
491
492 static int omap_aes_crypt_dma_start(struct omap_aes_dev *dd)
493 {
494 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(
495 crypto_ablkcipher_reqtfm(dd->req));
496 int err;
497
498 pr_debug("total: %d\n", dd->total);
499
500 if (!dd->pio_only) {
501 err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len,
502 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, dd->out_sg_len,
509 DMA_FROM_DEVICE);
510 if (!err) {
511 dev_err(dd->dev, "dma_map_sg() error\n");
512 return -EINVAL;
513 }
514 }
515
516 err = omap_aes_crypt_dma(tfm, dd->in_sg, dd->out_sg, dd->in_sg_len,
517 dd->out_sg_len);
518 if (err && !dd->pio_only) {
519 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
520 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
521 DMA_FROM_DEVICE);
522 }
523
524 return err;
525 }
526
527 static void omap_aes_finish_req(struct omap_aes_dev *dd, int err)
528 {
529 struct ablkcipher_request *req = dd->req;
530
531 pr_debug("err: %d\n", err);
532
533 crypto_finalize_request(dd->engine, req, err);
534 }
535
536 static int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd)
537 {
538 pr_debug("total: %d\n", dd->total);
539
540 omap_aes_dma_stop(dd);
541
542 dmaengine_terminate_all(dd->dma_lch_in);
543 dmaengine_terminate_all(dd->dma_lch_out);
544
545 return 0;
546 }
547
548 static int omap_aes_check_aligned(struct scatterlist *sg, int total)
549 {
550 int len = 0;
551
552 if (!IS_ALIGNED(total, AES_BLOCK_SIZE))
553 return -EINVAL;
554
555 while (sg) {
556 if (!IS_ALIGNED(sg->offset, 4))
557 return -1;
558 if (!IS_ALIGNED(sg->length, AES_BLOCK_SIZE))
559 return -1;
560
561 len += sg->length;
562 sg = sg_next(sg);
563 }
564
565 if (len != total)
566 return -1;
567
568 return 0;
569 }
570
571 static int omap_aes_copy_sgs(struct omap_aes_dev *dd)
572 {
573 void *buf_in, *buf_out;
574 int pages, total;
575
576 total = ALIGN(dd->total, AES_BLOCK_SIZE);
577 pages = get_order(total);
578
579 buf_in = (void *)__get_free_pages(GFP_ATOMIC, pages);
580 buf_out = (void *)__get_free_pages(GFP_ATOMIC, pages);
581
582 if (!buf_in || !buf_out) {
583 pr_err("Couldn't allocated pages for unaligned cases.\n");
584 return -1;
585 }
586
587 dd->orig_out = dd->out_sg;
588
589 sg_copy_buf(buf_in, dd->in_sg, 0, dd->total, 0);
590
591 sg_init_table(&dd->in_sgl, 1);
592 sg_set_buf(&dd->in_sgl, buf_in, total);
593 dd->in_sg = &dd->in_sgl;
594
595 sg_init_table(&dd->out_sgl, 1);
596 sg_set_buf(&dd->out_sgl, buf_out, total);
597 dd->out_sg = &dd->out_sgl;
598
599 return 0;
600 }
601
602 static int omap_aes_handle_queue(struct omap_aes_dev *dd,
603 struct ablkcipher_request *req)
604 {
605 if (req)
606 return crypto_transfer_request_to_engine(dd->engine, req);
607
608 return 0;
609 }
610
611 static int omap_aes_prepare_req(struct crypto_engine *engine,
612 struct ablkcipher_request *req)
613 {
614 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
615 crypto_ablkcipher_reqtfm(req));
616 struct omap_aes_dev *dd = omap_aes_find_dev(ctx);
617 struct omap_aes_reqctx *rctx;
618 int len;
619
620 if (!dd)
621 return -ENODEV;
622
623 /* assign new request to device */
624 dd->req = req;
625 dd->total = req->nbytes;
626 dd->total_save = req->nbytes;
627 dd->in_sg = req->src;
628 dd->out_sg = req->dst;
629
630 if (omap_aes_check_aligned(dd->in_sg, dd->total) ||
631 omap_aes_check_aligned(dd->out_sg, dd->total)) {
632 if (omap_aes_copy_sgs(dd))
633 pr_err("Failed to copy SGs for unaligned cases\n");
634 dd->sgs_copied = 1;
635 } else {
636 dd->sgs_copied = 0;
637 }
638
639 len = ALIGN(dd->total, AES_BLOCK_SIZE);
640 dd->in_sg_len = scatterwalk_bytes_sglen(dd->in_sg, len);
641 dd->out_sg_len = scatterwalk_bytes_sglen(dd->out_sg, len);
642 BUG_ON(dd->in_sg_len < 0 || dd->out_sg_len < 0);
643
644 rctx = ablkcipher_request_ctx(req);
645 ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
646 rctx->mode &= FLAGS_MODE_MASK;
647 dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
648
649 dd->ctx = ctx;
650 ctx->dd = dd;
651
652 return omap_aes_write_ctrl(dd);
653 }
654
655 static int omap_aes_crypt_req(struct crypto_engine *engine,
656 struct ablkcipher_request *req)
657 {
658 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
659 crypto_ablkcipher_reqtfm(req));
660 struct omap_aes_dev *dd = omap_aes_find_dev(ctx);
661
662 if (!dd)
663 return -ENODEV;
664
665 return omap_aes_crypt_dma_start(dd);
666 }
667
668 static void omap_aes_done_task(unsigned long data)
669 {
670 struct omap_aes_dev *dd = (struct omap_aes_dev *)data;
671 void *buf_in, *buf_out;
672 int pages, len;
673
674 pr_debug("enter done_task\n");
675
676 if (!dd->pio_only) {
677 dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len,
678 DMA_FROM_DEVICE);
679 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
680 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
681 DMA_FROM_DEVICE);
682 omap_aes_crypt_dma_stop(dd);
683 }
684
685 if (dd->sgs_copied) {
686 buf_in = sg_virt(&dd->in_sgl);
687 buf_out = sg_virt(&dd->out_sgl);
688
689 sg_copy_buf(buf_out, dd->orig_out, 0, dd->total_save, 1);
690
691 len = ALIGN(dd->total_save, AES_BLOCK_SIZE);
692 pages = get_order(len);
693 free_pages((unsigned long)buf_in, pages);
694 free_pages((unsigned long)buf_out, pages);
695 }
696
697 omap_aes_finish_req(dd, 0);
698
699 pr_debug("exit\n");
700 }
701
702 static int omap_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
703 {
704 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(
705 crypto_ablkcipher_reqtfm(req));
706 struct omap_aes_reqctx *rctx = ablkcipher_request_ctx(req);
707 struct omap_aes_dev *dd;
708
709 pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->nbytes,
710 !!(mode & FLAGS_ENCRYPT),
711 !!(mode & FLAGS_CBC));
712
713 dd = omap_aes_find_dev(ctx);
714 if (!dd)
715 return -ENODEV;
716
717 rctx->mode = mode;
718
719 return omap_aes_handle_queue(dd, req);
720 }
721
722 /* ********************** ALG API ************************************ */
723
724 static int omap_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
725 unsigned int keylen)
726 {
727 struct omap_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
728
729 if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
730 keylen != AES_KEYSIZE_256)
731 return -EINVAL;
732
733 pr_debug("enter, keylen: %d\n", keylen);
734
735 memcpy(ctx->key, key, keylen);
736 ctx->keylen = keylen;
737
738 return 0;
739 }
740
741 static int omap_aes_ecb_encrypt(struct ablkcipher_request *req)
742 {
743 return omap_aes_crypt(req, FLAGS_ENCRYPT);
744 }
745
746 static int omap_aes_ecb_decrypt(struct ablkcipher_request *req)
747 {
748 return omap_aes_crypt(req, 0);
749 }
750
751 static int omap_aes_cbc_encrypt(struct ablkcipher_request *req)
752 {
753 return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
754 }
755
756 static int omap_aes_cbc_decrypt(struct ablkcipher_request *req)
757 {
758 return omap_aes_crypt(req, FLAGS_CBC);
759 }
760
761 static int omap_aes_ctr_encrypt(struct ablkcipher_request *req)
762 {
763 return omap_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CTR);
764 }
765
766 static int omap_aes_ctr_decrypt(struct ablkcipher_request *req)
767 {
768 return omap_aes_crypt(req, FLAGS_CTR);
769 }
770
771 static int omap_aes_cra_init(struct crypto_tfm *tfm)
772 {
773 struct omap_aes_dev *dd = NULL;
774 int err;
775
776 /* Find AES device, currently picks the first device */
777 spin_lock_bh(&list_lock);
778 list_for_each_entry(dd, &dev_list, list) {
779 break;
780 }
781 spin_unlock_bh(&list_lock);
782
783 err = pm_runtime_get_sync(dd->dev);
784 if (err < 0) {
785 dev_err(dd->dev, "%s: failed to get_sync(%d)\n",
786 __func__, err);
787 return err;
788 }
789
790 tfm->crt_ablkcipher.reqsize = sizeof(struct omap_aes_reqctx);
791
792 return 0;
793 }
794
795 static void omap_aes_cra_exit(struct crypto_tfm *tfm)
796 {
797 struct omap_aes_dev *dd = NULL;
798
799 /* Find AES device, currently picks the first device */
800 spin_lock_bh(&list_lock);
801 list_for_each_entry(dd, &dev_list, list) {
802 break;
803 }
804 spin_unlock_bh(&list_lock);
805
806 pm_runtime_put_sync(dd->dev);
807 }
808
809 /* ********************** ALGS ************************************ */
810
811 static struct crypto_alg algs_ecb_cbc[] = {
812 {
813 .cra_name = "ecb(aes)",
814 .cra_driver_name = "ecb-aes-omap",
815 .cra_priority = 300,
816 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
817 CRYPTO_ALG_KERN_DRIVER_ONLY |
818 CRYPTO_ALG_ASYNC,
819 .cra_blocksize = AES_BLOCK_SIZE,
820 .cra_ctxsize = sizeof(struct omap_aes_ctx),
821 .cra_alignmask = 0,
822 .cra_type = &crypto_ablkcipher_type,
823 .cra_module = THIS_MODULE,
824 .cra_init = omap_aes_cra_init,
825 .cra_exit = omap_aes_cra_exit,
826 .cra_u.ablkcipher = {
827 .min_keysize = AES_MIN_KEY_SIZE,
828 .max_keysize = AES_MAX_KEY_SIZE,
829 .setkey = omap_aes_setkey,
830 .encrypt = omap_aes_ecb_encrypt,
831 .decrypt = omap_aes_ecb_decrypt,
832 }
833 },
834 {
835 .cra_name = "cbc(aes)",
836 .cra_driver_name = "cbc-aes-omap",
837 .cra_priority = 300,
838 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
839 CRYPTO_ALG_KERN_DRIVER_ONLY |
840 CRYPTO_ALG_ASYNC,
841 .cra_blocksize = AES_BLOCK_SIZE,
842 .cra_ctxsize = sizeof(struct omap_aes_ctx),
843 .cra_alignmask = 0,
844 .cra_type = &crypto_ablkcipher_type,
845 .cra_module = THIS_MODULE,
846 .cra_init = omap_aes_cra_init,
847 .cra_exit = omap_aes_cra_exit,
848 .cra_u.ablkcipher = {
849 .min_keysize = AES_MIN_KEY_SIZE,
850 .max_keysize = AES_MAX_KEY_SIZE,
851 .ivsize = AES_BLOCK_SIZE,
852 .setkey = omap_aes_setkey,
853 .encrypt = omap_aes_cbc_encrypt,
854 .decrypt = omap_aes_cbc_decrypt,
855 }
856 }
857 };
858
859 static struct crypto_alg algs_ctr[] = {
860 {
861 .cra_name = "ctr(aes)",
862 .cra_driver_name = "ctr-aes-omap",
863 .cra_priority = 300,
864 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
865 CRYPTO_ALG_KERN_DRIVER_ONLY |
866 CRYPTO_ALG_ASYNC,
867 .cra_blocksize = AES_BLOCK_SIZE,
868 .cra_ctxsize = sizeof(struct omap_aes_ctx),
869 .cra_alignmask = 0,
870 .cra_type = &crypto_ablkcipher_type,
871 .cra_module = THIS_MODULE,
872 .cra_init = omap_aes_cra_init,
873 .cra_exit = omap_aes_cra_exit,
874 .cra_u.ablkcipher = {
875 .min_keysize = AES_MIN_KEY_SIZE,
876 .max_keysize = AES_MAX_KEY_SIZE,
877 .geniv = "eseqiv",
878 .ivsize = AES_BLOCK_SIZE,
879 .setkey = omap_aes_setkey,
880 .encrypt = omap_aes_ctr_encrypt,
881 .decrypt = omap_aes_ctr_decrypt,
882 }
883 } ,
884 };
885
886 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc[] = {
887 {
888 .algs_list = algs_ecb_cbc,
889 .size = ARRAY_SIZE(algs_ecb_cbc),
890 },
891 };
892
893 static const struct omap_aes_pdata omap_aes_pdata_omap2 = {
894 .algs_info = omap_aes_algs_info_ecb_cbc,
895 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc),
896 .trigger = omap_aes_dma_trigger_omap2,
897 .key_ofs = 0x1c,
898 .iv_ofs = 0x20,
899 .ctrl_ofs = 0x30,
900 .data_ofs = 0x34,
901 .rev_ofs = 0x44,
902 .mask_ofs = 0x48,
903 .dma_enable_in = BIT(2),
904 .dma_enable_out = BIT(3),
905 .dma_start = BIT(5),
906 .major_mask = 0xf0,
907 .major_shift = 4,
908 .minor_mask = 0x0f,
909 .minor_shift = 0,
910 };
911
912 #ifdef CONFIG_OF
913 static struct omap_aes_algs_info omap_aes_algs_info_ecb_cbc_ctr[] = {
914 {
915 .algs_list = algs_ecb_cbc,
916 .size = ARRAY_SIZE(algs_ecb_cbc),
917 },
918 {
919 .algs_list = algs_ctr,
920 .size = ARRAY_SIZE(algs_ctr),
921 },
922 };
923
924 static const struct omap_aes_pdata omap_aes_pdata_omap3 = {
925 .algs_info = omap_aes_algs_info_ecb_cbc_ctr,
926 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
927 .trigger = omap_aes_dma_trigger_omap2,
928 .key_ofs = 0x1c,
929 .iv_ofs = 0x20,
930 .ctrl_ofs = 0x30,
931 .data_ofs = 0x34,
932 .rev_ofs = 0x44,
933 .mask_ofs = 0x48,
934 .dma_enable_in = BIT(2),
935 .dma_enable_out = BIT(3),
936 .dma_start = BIT(5),
937 .major_mask = 0xf0,
938 .major_shift = 4,
939 .minor_mask = 0x0f,
940 .minor_shift = 0,
941 };
942
943 static const struct omap_aes_pdata omap_aes_pdata_omap4 = {
944 .algs_info = omap_aes_algs_info_ecb_cbc_ctr,
945 .algs_info_size = ARRAY_SIZE(omap_aes_algs_info_ecb_cbc_ctr),
946 .trigger = omap_aes_dma_trigger_omap4,
947 .key_ofs = 0x3c,
948 .iv_ofs = 0x40,
949 .ctrl_ofs = 0x50,
950 .data_ofs = 0x60,
951 .rev_ofs = 0x80,
952 .mask_ofs = 0x84,
953 .irq_status_ofs = 0x8c,
954 .irq_enable_ofs = 0x90,
955 .dma_enable_in = BIT(5),
956 .dma_enable_out = BIT(6),
957 .major_mask = 0x0700,
958 .major_shift = 8,
959 .minor_mask = 0x003f,
960 .minor_shift = 0,
961 };
962
963 static irqreturn_t omap_aes_irq(int irq, void *dev_id)
964 {
965 struct omap_aes_dev *dd = dev_id;
966 u32 status, i;
967 u32 *src, *dst;
968
969 status = omap_aes_read(dd, AES_REG_IRQ_STATUS(dd));
970 if (status & AES_REG_IRQ_DATA_IN) {
971 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
972
973 BUG_ON(!dd->in_sg);
974
975 BUG_ON(_calc_walked(in) > dd->in_sg->length);
976
977 src = sg_virt(dd->in_sg) + _calc_walked(in);
978
979 for (i = 0; i < AES_BLOCK_WORDS; i++) {
980 omap_aes_write(dd, AES_REG_DATA_N(dd, i), *src);
981
982 scatterwalk_advance(&dd->in_walk, 4);
983 if (dd->in_sg->length == _calc_walked(in)) {
984 dd->in_sg = sg_next(dd->in_sg);
985 if (dd->in_sg) {
986 scatterwalk_start(&dd->in_walk,
987 dd->in_sg);
988 src = sg_virt(dd->in_sg) +
989 _calc_walked(in);
990 }
991 } else {
992 src++;
993 }
994 }
995
996 /* Clear IRQ status */
997 status &= ~AES_REG_IRQ_DATA_IN;
998 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
999
1000 /* Enable DATA_OUT interrupt */
1001 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x4);
1002
1003 } else if (status & AES_REG_IRQ_DATA_OUT) {
1004 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
1005
1006 BUG_ON(!dd->out_sg);
1007
1008 BUG_ON(_calc_walked(out) > dd->out_sg->length);
1009
1010 dst = sg_virt(dd->out_sg) + _calc_walked(out);
1011
1012 for (i = 0; i < AES_BLOCK_WORDS; i++) {
1013 *dst = omap_aes_read(dd, AES_REG_DATA_N(dd, i));
1014 scatterwalk_advance(&dd->out_walk, 4);
1015 if (dd->out_sg->length == _calc_walked(out)) {
1016 dd->out_sg = sg_next(dd->out_sg);
1017 if (dd->out_sg) {
1018 scatterwalk_start(&dd->out_walk,
1019 dd->out_sg);
1020 dst = sg_virt(dd->out_sg) +
1021 _calc_walked(out);
1022 }
1023 } else {
1024 dst++;
1025 }
1026 }
1027
1028 dd->total -= min_t(size_t, AES_BLOCK_SIZE, dd->total);
1029
1030 /* Clear IRQ status */
1031 status &= ~AES_REG_IRQ_DATA_OUT;
1032 omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
1033
1034 if (!dd->total)
1035 /* All bytes read! */
1036 tasklet_schedule(&dd->done_task);
1037 else
1038 /* Enable DATA_IN interrupt for next block */
1039 omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
1040 }
1041
1042 return IRQ_HANDLED;
1043 }
1044
1045 static const struct of_device_id omap_aes_of_match[] = {
1046 {
1047 .compatible = "ti,omap2-aes",
1048 .data = &omap_aes_pdata_omap2,
1049 },
1050 {
1051 .compatible = "ti,omap3-aes",
1052 .data = &omap_aes_pdata_omap3,
1053 },
1054 {
1055 .compatible = "ti,omap4-aes",
1056 .data = &omap_aes_pdata_omap4,
1057 },
1058 {},
1059 };
1060 MODULE_DEVICE_TABLE(of, omap_aes_of_match);
1061
1062 static int omap_aes_get_res_of(struct omap_aes_dev *dd,
1063 struct device *dev, struct resource *res)
1064 {
1065 struct device_node *node = dev->of_node;
1066 const struct of_device_id *match;
1067 int err = 0;
1068
1069 match = of_match_device(of_match_ptr(omap_aes_of_match), dev);
1070 if (!match) {
1071 dev_err(dev, "no compatible OF match\n");
1072 err = -EINVAL;
1073 goto err;
1074 }
1075
1076 err = of_address_to_resource(node, 0, res);
1077 if (err < 0) {
1078 dev_err(dev, "can't translate OF node address\n");
1079 err = -EINVAL;
1080 goto err;
1081 }
1082
1083 dd->dma_out = -1; /* Dummy value that's unused */
1084 dd->dma_in = -1; /* Dummy value that's unused */
1085
1086 dd->pdata = match->data;
1087
1088 err:
1089 return err;
1090 }
1091 #else
1092 static const struct of_device_id omap_aes_of_match[] = {
1093 {},
1094 };
1095
1096 static int omap_aes_get_res_of(struct omap_aes_dev *dd,
1097 struct device *dev, struct resource *res)
1098 {
1099 return -EINVAL;
1100 }
1101 #endif
1102
1103 static int omap_aes_get_res_pdev(struct omap_aes_dev *dd,
1104 struct platform_device *pdev, struct resource *res)
1105 {
1106 struct device *dev = &pdev->dev;
1107 struct resource *r;
1108 int err = 0;
1109
1110 /* Get the base address */
1111 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1112 if (!r) {
1113 dev_err(dev, "no MEM resource info\n");
1114 err = -ENODEV;
1115 goto err;
1116 }
1117 memcpy(res, r, sizeof(*res));
1118
1119 /* Get the DMA out channel */
1120 r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1121 if (!r) {
1122 dev_err(dev, "no DMA out resource info\n");
1123 err = -ENODEV;
1124 goto err;
1125 }
1126 dd->dma_out = r->start;
1127
1128 /* Get the DMA in channel */
1129 r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1130 if (!r) {
1131 dev_err(dev, "no DMA in resource info\n");
1132 err = -ENODEV;
1133 goto err;
1134 }
1135 dd->dma_in = r->start;
1136
1137 /* Only OMAP2/3 can be non-DT */
1138 dd->pdata = &omap_aes_pdata_omap2;
1139
1140 err:
1141 return err;
1142 }
1143
1144 static int omap_aes_probe(struct platform_device *pdev)
1145 {
1146 struct device *dev = &pdev->dev;
1147 struct omap_aes_dev *dd;
1148 struct crypto_alg *algp;
1149 struct resource res;
1150 int err = -ENOMEM, i, j, irq = -1;
1151 u32 reg;
1152
1153 dd = devm_kzalloc(dev, sizeof(struct omap_aes_dev), GFP_KERNEL);
1154 if (dd == NULL) {
1155 dev_err(dev, "unable to alloc data struct.\n");
1156 goto err_data;
1157 }
1158 dd->dev = dev;
1159 platform_set_drvdata(pdev, dd);
1160
1161 err = (dev->of_node) ? omap_aes_get_res_of(dd, dev, &res) :
1162 omap_aes_get_res_pdev(dd, pdev, &res);
1163 if (err)
1164 goto err_res;
1165
1166 dd->io_base = devm_ioremap_resource(dev, &res);
1167 if (IS_ERR(dd->io_base)) {
1168 err = PTR_ERR(dd->io_base);
1169 goto err_res;
1170 }
1171 dd->phys_base = res.start;
1172
1173 pm_runtime_enable(dev);
1174 err = pm_runtime_get_sync(dev);
1175 if (err < 0) {
1176 dev_err(dev, "%s: failed to get_sync(%d)\n",
1177 __func__, err);
1178 goto err_res;
1179 }
1180
1181 omap_aes_dma_stop(dd);
1182
1183 reg = omap_aes_read(dd, AES_REG_REV(dd));
1184
1185 pm_runtime_put_sync(dev);
1186
1187 dev_info(dev, "OMAP AES hw accel rev: %u.%u\n",
1188 (reg & dd->pdata->major_mask) >> dd->pdata->major_shift,
1189 (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
1190
1191 tasklet_init(&dd->done_task, omap_aes_done_task, (unsigned long)dd);
1192
1193 err = omap_aes_dma_init(dd);
1194 if (err && AES_REG_IRQ_STATUS(dd) && AES_REG_IRQ_ENABLE(dd)) {
1195 dd->pio_only = 1;
1196
1197 irq = platform_get_irq(pdev, 0);
1198 if (irq < 0) {
1199 dev_err(dev, "can't get IRQ resource\n");
1200 goto err_irq;
1201 }
1202
1203 err = devm_request_irq(dev, irq, omap_aes_irq, 0,
1204 dev_name(dev), dd);
1205 if (err) {
1206 dev_err(dev, "Unable to grab omap-aes IRQ\n");
1207 goto err_irq;
1208 }
1209 }
1210
1211
1212 INIT_LIST_HEAD(&dd->list);
1213 spin_lock(&list_lock);
1214 list_add_tail(&dd->list, &dev_list);
1215 spin_unlock(&list_lock);
1216
1217 for (i = 0; i < dd->pdata->algs_info_size; i++) {
1218 for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
1219 algp = &dd->pdata->algs_info[i].algs_list[j];
1220
1221 pr_debug("reg alg: %s\n", algp->cra_name);
1222 INIT_LIST_HEAD(&algp->cra_list);
1223
1224 err = crypto_register_alg(algp);
1225 if (err)
1226 goto err_algs;
1227
1228 dd->pdata->algs_info[i].registered++;
1229 }
1230 }
1231
1232 /* Initialize crypto engine */
1233 dd->engine = crypto_engine_alloc_init(dev, 1);
1234 if (!dd->engine)
1235 goto err_algs;
1236
1237 dd->engine->prepare_request = omap_aes_prepare_req;
1238 dd->engine->crypt_one_request = omap_aes_crypt_req;
1239 err = crypto_engine_start(dd->engine);
1240 if (err)
1241 goto err_engine;
1242
1243 return 0;
1244 err_engine:
1245 crypto_engine_exit(dd->engine);
1246 err_algs:
1247 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1248 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1249 crypto_unregister_alg(
1250 &dd->pdata->algs_info[i].algs_list[j]);
1251 if (!dd->pio_only)
1252 omap_aes_dma_cleanup(dd);
1253 err_irq:
1254 tasklet_kill(&dd->done_task);
1255 pm_runtime_disable(dev);
1256 err_res:
1257 dd = NULL;
1258 err_data:
1259 dev_err(dev, "initialization failed.\n");
1260 return err;
1261 }
1262
1263 static int omap_aes_remove(struct platform_device *pdev)
1264 {
1265 struct omap_aes_dev *dd = platform_get_drvdata(pdev);
1266 int i, j;
1267
1268 if (!dd)
1269 return -ENODEV;
1270
1271 spin_lock(&list_lock);
1272 list_del(&dd->list);
1273 spin_unlock(&list_lock);
1274
1275 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1276 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1277 crypto_unregister_alg(
1278 &dd->pdata->algs_info[i].algs_list[j]);
1279
1280 crypto_engine_exit(dd->engine);
1281 tasklet_kill(&dd->done_task);
1282 omap_aes_dma_cleanup(dd);
1283 pm_runtime_disable(dd->dev);
1284 dd = NULL;
1285
1286 return 0;
1287 }
1288
1289 #ifdef CONFIG_PM_SLEEP
1290 static int omap_aes_suspend(struct device *dev)
1291 {
1292 pm_runtime_put_sync(dev);
1293 return 0;
1294 }
1295
1296 static int omap_aes_resume(struct device *dev)
1297 {
1298 pm_runtime_get_sync(dev);
1299 return 0;
1300 }
1301 #endif
1302
1303 static SIMPLE_DEV_PM_OPS(omap_aes_pm_ops, omap_aes_suspend, omap_aes_resume);
1304
1305 static struct platform_driver omap_aes_driver = {
1306 .probe = omap_aes_probe,
1307 .remove = omap_aes_remove,
1308 .driver = {
1309 .name = "omap-aes",
1310 .pm = &omap_aes_pm_ops,
1311 .of_match_table = omap_aes_of_match,
1312 },
1313 };
1314
1315 module_platform_driver(omap_aes_driver);
1316
1317 MODULE_DESCRIPTION("OMAP AES hw acceleration support.");
1318 MODULE_LICENSE("GPL v2");
1319 MODULE_AUTHOR("Dmitry Kasatkin");
1320
Linux with added FPC-III support