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Merge tag 'for_linux-3.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jwess...
[linux/fpc-iii.git] / drivers / crypto / omap-des.c
blob46307098f8bab497734ca5dbbfb7fe2502ed082f
1 /*
2 * Support for OMAP DES and Triple DES HW acceleration.
3 *
4 * Copyright (c) 2013 Texas Instruments Incorporated
5 * Author: Joel Fernandes <joelf@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as published
9 * by the Free Software Foundation.
10 *
11 */
12
13 #define pr_fmt(fmt) "%s: " fmt, __func__
14
15 #ifdef DEBUG
16 #define prn(num) printk(#num "=%d\n", num)
17 #define prx(num) printk(#num "=%x\n", num)
18 #else
19 #define prn(num) do { } while (0)
20 #define prx(num) do { } while (0)
21 #endif
22
23 #include <linux/err.h>
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/errno.h>
27 #include <linux/kernel.h>
28 #include <linux/platform_device.h>
29 #include <linux/scatterlist.h>
30 #include <linux/dma-mapping.h>
31 #include <linux/dmaengine.h>
32 #include <linux/omap-dma.h>
33 #include <linux/pm_runtime.h>
34 #include <linux/of.h>
35 #include <linux/of_device.h>
36 #include <linux/of_address.h>
37 #include <linux/io.h>
38 #include <linux/crypto.h>
39 #include <linux/interrupt.h>
40 #include <crypto/scatterwalk.h>
41 #include <crypto/des.h>
42
43 #define DST_MAXBURST 2
44
45 #define DES_BLOCK_WORDS (DES_BLOCK_SIZE >> 2)
46
47 #define _calc_walked(inout) (dd->inout##_walk.offset - dd->inout##_sg->offset)
48
49 #define DES_REG_KEY(dd, x) ((dd)->pdata->key_ofs - \
50 ((x ^ 0x01) * 0x04))
51
52 #define DES_REG_IV(dd, x) ((dd)->pdata->iv_ofs + ((x) * 0x04))
53
54 #define DES_REG_CTRL(dd) ((dd)->pdata->ctrl_ofs)
55 #define DES_REG_CTRL_CBC BIT(4)
56 #define DES_REG_CTRL_TDES BIT(3)
57 #define DES_REG_CTRL_DIRECTION BIT(2)
58 #define DES_REG_CTRL_INPUT_READY BIT(1)
59 #define DES_REG_CTRL_OUTPUT_READY BIT(0)
60
61 #define DES_REG_DATA_N(dd, x) ((dd)->pdata->data_ofs + ((x) * 0x04))
62
63 #define DES_REG_REV(dd) ((dd)->pdata->rev_ofs)
64
65 #define DES_REG_MASK(dd) ((dd)->pdata->mask_ofs)
66
67 #define DES_REG_LENGTH_N(x) (0x24 + ((x) * 0x04))
68
69 #define DES_REG_IRQ_STATUS(dd) ((dd)->pdata->irq_status_ofs)
70 #define DES_REG_IRQ_ENABLE(dd) ((dd)->pdata->irq_enable_ofs)
71 #define DES_REG_IRQ_DATA_IN BIT(1)
72 #define DES_REG_IRQ_DATA_OUT BIT(2)
73
74 #define FLAGS_MODE_MASK 0x000f
75 #define FLAGS_ENCRYPT BIT(0)
76 #define FLAGS_CBC BIT(1)
77 #define FLAGS_INIT BIT(4)
78 #define FLAGS_BUSY BIT(6)
79
80 struct omap_des_ctx {
81 struct omap_des_dev *dd;
82
83 int keylen;
84 u32 key[(3 * DES_KEY_SIZE) / sizeof(u32)];
85 unsigned long flags;
86 };
87
88 struct omap_des_reqctx {
89 unsigned long mode;
90 };
91
92 #define OMAP_DES_QUEUE_LENGTH 1
93 #define OMAP_DES_CACHE_SIZE 0
94
95 struct omap_des_algs_info {
96 struct crypto_alg *algs_list;
97 unsigned int size;
98 unsigned int registered;
99 };
100
101 struct omap_des_pdata {
102 struct omap_des_algs_info *algs_info;
103 unsigned int algs_info_size;
104
105 void (*trigger)(struct omap_des_dev *dd, int length);
106
107 u32 key_ofs;
108 u32 iv_ofs;
109 u32 ctrl_ofs;
110 u32 data_ofs;
111 u32 rev_ofs;
112 u32 mask_ofs;
113 u32 irq_enable_ofs;
114 u32 irq_status_ofs;
115
116 u32 dma_enable_in;
117 u32 dma_enable_out;
118 u32 dma_start;
119
120 u32 major_mask;
121 u32 major_shift;
122 u32 minor_mask;
123 u32 minor_shift;
124 };
125
126 struct omap_des_dev {
127 struct list_head list;
128 unsigned long phys_base;
129 void __iomem *io_base;
130 struct omap_des_ctx *ctx;
131 struct device *dev;
132 unsigned long flags;
133 int err;
134
135 /* spinlock used for queues */
136 spinlock_t lock;
137 struct crypto_queue queue;
138
139 struct tasklet_struct done_task;
140 struct tasklet_struct queue_task;
141
142 struct ablkcipher_request *req;
143 /*
144 * total is used by PIO mode for book keeping so introduce
145 * variable total_save as need it to calc page_order
146 */
147 size_t total;
148 size_t total_save;
149
150 struct scatterlist *in_sg;
151 struct scatterlist *out_sg;
152
153 /* Buffers for copying for unaligned cases */
154 struct scatterlist in_sgl;
155 struct scatterlist out_sgl;
156 struct scatterlist *orig_out;
157 int sgs_copied;
158
159 struct scatter_walk in_walk;
160 struct scatter_walk out_walk;
161 int dma_in;
162 struct dma_chan *dma_lch_in;
163 int dma_out;
164 struct dma_chan *dma_lch_out;
165 int in_sg_len;
166 int out_sg_len;
167 int pio_only;
168 const struct omap_des_pdata *pdata;
169 };
170
171 /* keep registered devices data here */
172 static LIST_HEAD(dev_list);
173 static DEFINE_SPINLOCK(list_lock);
174
175 #ifdef DEBUG
176 #define omap_des_read(dd, offset) \
177 ({ \
178 int _read_ret; \
179 _read_ret = __raw_readl(dd->io_base + offset); \
180 pr_err("omap_des_read(" #offset "=%#x)= %#x\n", \
181 offset, _read_ret); \
182 _read_ret; \
183 })
184 #else
185 static inline u32 omap_des_read(struct omap_des_dev *dd, u32 offset)
186 {
187 return __raw_readl(dd->io_base + offset);
188 }
189 #endif
190
191 #ifdef DEBUG
192 #define omap_des_write(dd, offset, value) \
193 do { \
194 pr_err("omap_des_write(" #offset "=%#x) value=%#x\n", \
195 offset, value); \
196 __raw_writel(value, dd->io_base + offset); \
197 } while (0)
198 #else
199 static inline void omap_des_write(struct omap_des_dev *dd, u32 offset,
200 u32 value)
201 {
202 __raw_writel(value, dd->io_base + offset);
203 }
204 #endif
205
206 static inline void omap_des_write_mask(struct omap_des_dev *dd, u32 offset,
207 u32 value, u32 mask)
208 {
209 u32 val;
210
211 val = omap_des_read(dd, offset);
212 val &= ~mask;
213 val |= value;
214 omap_des_write(dd, offset, val);
215 }
216
217 static void omap_des_write_n(struct omap_des_dev *dd, u32 offset,
218 u32 *value, int count)
219 {
220 for (; count--; value++, offset += 4)
221 omap_des_write(dd, offset, *value);
222 }
223
224 static int omap_des_hw_init(struct omap_des_dev *dd)
225 {
226 int err;
227
228 /*
229 * clocks are enabled when request starts and disabled when finished.
230 * It may be long delays between requests.
231 * Device might go to off mode to save power.
232 */
233 err = pm_runtime_get_sync(dd->dev);
234 if (err < 0) {
235 pm_runtime_put_noidle(dd->dev);
236 dev_err(dd->dev, "%s: failed to get_sync(%d)\n", __func__, err);
237 return err;
238 }
239
240 if (!(dd->flags & FLAGS_INIT)) {
241 dd->flags |= FLAGS_INIT;
242 dd->err = 0;
243 }
244
245 return 0;
246 }
247
248 static int omap_des_write_ctrl(struct omap_des_dev *dd)
249 {
250 unsigned int key32;
251 int i, err;
252 u32 val = 0, mask = 0;
253
254 err = omap_des_hw_init(dd);
255 if (err)
256 return err;
257
258 key32 = dd->ctx->keylen / sizeof(u32);
259
260 /* it seems a key should always be set even if it has not changed */
261 for (i = 0; i < key32; i++) {
262 omap_des_write(dd, DES_REG_KEY(dd, i),
263 __le32_to_cpu(dd->ctx->key[i]));
264 }
265
266 if ((dd->flags & FLAGS_CBC) && dd->req->info)
267 omap_des_write_n(dd, DES_REG_IV(dd, 0), dd->req->info, 2);
268
269 if (dd->flags & FLAGS_CBC)
270 val |= DES_REG_CTRL_CBC;
271 if (dd->flags & FLAGS_ENCRYPT)
272 val |= DES_REG_CTRL_DIRECTION;
273 if (key32 == 6)
274 val |= DES_REG_CTRL_TDES;
275
276 mask |= DES_REG_CTRL_CBC | DES_REG_CTRL_DIRECTION | DES_REG_CTRL_TDES;
277
278 omap_des_write_mask(dd, DES_REG_CTRL(dd), val, mask);
279
280 return 0;
281 }
282
283 static void omap_des_dma_trigger_omap4(struct omap_des_dev *dd, int length)
284 {
285 u32 mask, val;
286
287 omap_des_write(dd, DES_REG_LENGTH_N(0), length);
288
289 val = dd->pdata->dma_start;
290
291 if (dd->dma_lch_out != NULL)
292 val |= dd->pdata->dma_enable_out;
293 if (dd->dma_lch_in != NULL)
294 val |= dd->pdata->dma_enable_in;
295
296 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
297 dd->pdata->dma_start;
298
299 omap_des_write_mask(dd, DES_REG_MASK(dd), val, mask);
300 }
301
302 static void omap_des_dma_stop(struct omap_des_dev *dd)
303 {
304 u32 mask;
305
306 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
307 dd->pdata->dma_start;
308
309 omap_des_write_mask(dd, DES_REG_MASK(dd), 0, mask);
310 }
311
312 static struct omap_des_dev *omap_des_find_dev(struct omap_des_ctx *ctx)
313 {
314 struct omap_des_dev *dd = NULL, *tmp;
315
316 spin_lock_bh(&list_lock);
317 if (!ctx->dd) {
318 list_for_each_entry(tmp, &dev_list, list) {
319 /* FIXME: take fist available des core */
320 dd = tmp;
321 break;
322 }
323 ctx->dd = dd;
324 } else {
325 /* already found before */
326 dd = ctx->dd;
327 }
328 spin_unlock_bh(&list_lock);
329
330 return dd;
331 }
332
333 static void omap_des_dma_out_callback(void *data)
334 {
335 struct omap_des_dev *dd = data;
336
337 /* dma_lch_out - completed */
338 tasklet_schedule(&dd->done_task);
339 }
340
341 static int omap_des_dma_init(struct omap_des_dev *dd)
342 {
343 int err = -ENOMEM;
344 dma_cap_mask_t mask;
345
346 dd->dma_lch_out = NULL;
347 dd->dma_lch_in = NULL;
348
349 dma_cap_zero(mask);
350 dma_cap_set(DMA_SLAVE, mask);
351
352 dd->dma_lch_in = dma_request_slave_channel_compat(mask,
353 omap_dma_filter_fn,
354 &dd->dma_in,
355 dd->dev, "rx");
356 if (!dd->dma_lch_in) {
357 dev_err(dd->dev, "Unable to request in DMA channel\n");
358 goto err_dma_in;
359 }
360
361 dd->dma_lch_out = dma_request_slave_channel_compat(mask,
362 omap_dma_filter_fn,
363 &dd->dma_out,
364 dd->dev, "tx");
365 if (!dd->dma_lch_out) {
366 dev_err(dd->dev, "Unable to request out DMA channel\n");
367 goto err_dma_out;
368 }
369
370 return 0;
371
372 err_dma_out:
373 dma_release_channel(dd->dma_lch_in);
374 err_dma_in:
375 if (err)
376 pr_err("error: %d\n", err);
377 return err;
378 }
379
380 static void omap_des_dma_cleanup(struct omap_des_dev *dd)
381 {
382 dma_release_channel(dd->dma_lch_out);
383 dma_release_channel(dd->dma_lch_in);
384 }
385
386 static void sg_copy_buf(void *buf, struct scatterlist *sg,
387 unsigned int start, unsigned int nbytes, int out)
388 {
389 struct scatter_walk walk;
390
391 if (!nbytes)
392 return;
393
394 scatterwalk_start(&walk, sg);
395 scatterwalk_advance(&walk, start);
396 scatterwalk_copychunks(buf, &walk, nbytes, out);
397 scatterwalk_done(&walk, out, 0);
398 }
399
400 static int omap_des_crypt_dma(struct crypto_tfm *tfm,
401 struct scatterlist *in_sg, struct scatterlist *out_sg,
402 int in_sg_len, int out_sg_len)
403 {
404 struct omap_des_ctx *ctx = crypto_tfm_ctx(tfm);
405 struct omap_des_dev *dd = ctx->dd;
406 struct dma_async_tx_descriptor *tx_in, *tx_out;
407 struct dma_slave_config cfg;
408 int ret;
409
410 if (dd->pio_only) {
411 scatterwalk_start(&dd->in_walk, dd->in_sg);
412 scatterwalk_start(&dd->out_walk, dd->out_sg);
413
414 /* Enable DATAIN interrupt and let it take
415 care of the rest */
416 omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x2);
417 return 0;
418 }
419
420 dma_sync_sg_for_device(dd->dev, dd->in_sg, in_sg_len, DMA_TO_DEVICE);
421
422 memset(&cfg, 0, sizeof(cfg));
423
424 cfg.src_addr = dd->phys_base + DES_REG_DATA_N(dd, 0);
425 cfg.dst_addr = dd->phys_base + DES_REG_DATA_N(dd, 0);
426 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
427 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
428 cfg.src_maxburst = DST_MAXBURST;
429 cfg.dst_maxburst = DST_MAXBURST;
430
431 /* IN */
432 ret = dmaengine_slave_config(dd->dma_lch_in, &cfg);
433 if (ret) {
434 dev_err(dd->dev, "can't configure IN dmaengine slave: %d\n",
435 ret);
436 return ret;
437 }
438
439 tx_in = dmaengine_prep_slave_sg(dd->dma_lch_in, in_sg, in_sg_len,
440 DMA_MEM_TO_DEV,
441 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
442 if (!tx_in) {
443 dev_err(dd->dev, "IN prep_slave_sg() failed\n");
444 return -EINVAL;
445 }
446
447 /* No callback necessary */
448 tx_in->callback_param = dd;
449
450 /* OUT */
451 ret = dmaengine_slave_config(dd->dma_lch_out, &cfg);
452 if (ret) {
453 dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n",
454 ret);
455 return ret;
456 }
457
458 tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg, out_sg_len,
459 DMA_DEV_TO_MEM,
460 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
461 if (!tx_out) {
462 dev_err(dd->dev, "OUT prep_slave_sg() failed\n");
463 return -EINVAL;
464 }
465
466 tx_out->callback = omap_des_dma_out_callback;
467 tx_out->callback_param = dd;
468
469 dmaengine_submit(tx_in);
470 dmaengine_submit(tx_out);
471
472 dma_async_issue_pending(dd->dma_lch_in);
473 dma_async_issue_pending(dd->dma_lch_out);
474
475 /* start DMA */
476 dd->pdata->trigger(dd, dd->total);
477
478 return 0;
479 }
480
481 static int omap_des_crypt_dma_start(struct omap_des_dev *dd)
482 {
483 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(
484 crypto_ablkcipher_reqtfm(dd->req));
485 int err;
486
487 pr_debug("total: %d\n", dd->total);
488
489 if (!dd->pio_only) {
490 err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len,
491 DMA_TO_DEVICE);
492 if (!err) {
493 dev_err(dd->dev, "dma_map_sg() error\n");
494 return -EINVAL;
495 }
496
497 err = dma_map_sg(dd->dev, dd->out_sg, dd->out_sg_len,
498 DMA_FROM_DEVICE);
499 if (!err) {
500 dev_err(dd->dev, "dma_map_sg() error\n");
501 return -EINVAL;
502 }
503 }
504
505 err = omap_des_crypt_dma(tfm, dd->in_sg, dd->out_sg, dd->in_sg_len,
506 dd->out_sg_len);
507 if (err && !dd->pio_only) {
508 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
509 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
510 DMA_FROM_DEVICE);
511 }
512
513 return err;
514 }
515
516 static void omap_des_finish_req(struct omap_des_dev *dd, int err)
517 {
518 struct ablkcipher_request *req = dd->req;
519
520 pr_debug("err: %d\n", err);
521
522 pm_runtime_put(dd->dev);
523 dd->flags &= ~FLAGS_BUSY;
524
525 req->base.complete(&req->base, err);
526 }
527
528 static int omap_des_crypt_dma_stop(struct omap_des_dev *dd)
529 {
530 int err = 0;
531
532 pr_debug("total: %d\n", dd->total);
533
534 omap_des_dma_stop(dd);
535
536 dmaengine_terminate_all(dd->dma_lch_in);
537 dmaengine_terminate_all(dd->dma_lch_out);
538
539 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
540 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len, DMA_FROM_DEVICE);
541
542 return err;
543 }
544
545 static int omap_des_copy_needed(struct scatterlist *sg)
546 {
547 while (sg) {
548 if (!IS_ALIGNED(sg->offset, 4))
549 return -1;
550 if (!IS_ALIGNED(sg->length, DES_BLOCK_SIZE))
551 return -1;
552 sg = sg_next(sg);
553 }
554 return 0;
555 }
556
557 static int omap_des_copy_sgs(struct omap_des_dev *dd)
558 {
559 void *buf_in, *buf_out;
560 int pages;
561
562 pages = dd->total >> PAGE_SHIFT;
563
564 if (dd->total & (PAGE_SIZE-1))
565 pages++;
566
567 BUG_ON(!pages);
568
569 buf_in = (void *)__get_free_pages(GFP_ATOMIC, pages);
570 buf_out = (void *)__get_free_pages(GFP_ATOMIC, pages);
571
572 if (!buf_in || !buf_out) {
573 pr_err("Couldn't allocated pages for unaligned cases.\n");
574 return -1;
575 }
576
577 dd->orig_out = dd->out_sg;
578
579 sg_copy_buf(buf_in, dd->in_sg, 0, dd->total, 0);
580
581 sg_init_table(&dd->in_sgl, 1);
582 sg_set_buf(&dd->in_sgl, buf_in, dd->total);
583 dd->in_sg = &dd->in_sgl;
584
585 sg_init_table(&dd->out_sgl, 1);
586 sg_set_buf(&dd->out_sgl, buf_out, dd->total);
587 dd->out_sg = &dd->out_sgl;
588
589 return 0;
590 }
591
592 static int omap_des_handle_queue(struct omap_des_dev *dd,
593 struct ablkcipher_request *req)
594 {
595 struct crypto_async_request *async_req, *backlog;
596 struct omap_des_ctx *ctx;
597 struct omap_des_reqctx *rctx;
598 unsigned long flags;
599 int err, ret = 0;
600
601 spin_lock_irqsave(&dd->lock, flags);
602 if (req)
603 ret = ablkcipher_enqueue_request(&dd->queue, req);
604 if (dd->flags & FLAGS_BUSY) {
605 spin_unlock_irqrestore(&dd->lock, flags);
606 return ret;
607 }
608 backlog = crypto_get_backlog(&dd->queue);
609 async_req = crypto_dequeue_request(&dd->queue);
610 if (async_req)
611 dd->flags |= FLAGS_BUSY;
612 spin_unlock_irqrestore(&dd->lock, flags);
613
614 if (!async_req)
615 return ret;
616
617 if (backlog)
618 backlog->complete(backlog, -EINPROGRESS);
619
620 req = ablkcipher_request_cast(async_req);
621
622 /* assign new request to device */
623 dd->req = req;
624 dd->total = req->nbytes;
625 dd->total_save = req->nbytes;
626 dd->in_sg = req->src;
627 dd->out_sg = req->dst;
628
629 if (omap_des_copy_needed(dd->in_sg) ||
630 omap_des_copy_needed(dd->out_sg)) {
631 if (omap_des_copy_sgs(dd))
632 pr_err("Failed to copy SGs for unaligned cases\n");
633 dd->sgs_copied = 1;
634 } else {
635 dd->sgs_copied = 0;
636 }
637
638 dd->in_sg_len = scatterwalk_bytes_sglen(dd->in_sg, dd->total);
639 dd->out_sg_len = scatterwalk_bytes_sglen(dd->out_sg, dd->total);
640 BUG_ON(dd->in_sg_len < 0 || dd->out_sg_len < 0);
641
642 rctx = ablkcipher_request_ctx(req);
643 ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
644 rctx->mode &= FLAGS_MODE_MASK;
645 dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
646
647 dd->ctx = ctx;
648 ctx->dd = dd;
649
650 err = omap_des_write_ctrl(dd);
651 if (!err)
652 err = omap_des_crypt_dma_start(dd);
653 if (err) {
654 /* des_task will not finish it, so do it here */
655 omap_des_finish_req(dd, err);
656 tasklet_schedule(&dd->queue_task);
657 }
658
659 return ret; /* return ret, which is enqueue return value */
660 }
661
662 static void omap_des_done_task(unsigned long data)
663 {
664 struct omap_des_dev *dd = (struct omap_des_dev *)data;
665 void *buf_in, *buf_out;
666 int pages;
667
668 pr_debug("enter done_task\n");
669
670 if (!dd->pio_only) {
671 dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len,
672 DMA_FROM_DEVICE);
673 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
674 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
675 DMA_FROM_DEVICE);
676 omap_des_crypt_dma_stop(dd);
677 }
678
679 if (dd->sgs_copied) {
680 buf_in = sg_virt(&dd->in_sgl);
681 buf_out = sg_virt(&dd->out_sgl);
682
683 sg_copy_buf(buf_out, dd->orig_out, 0, dd->total_save, 1);
684
685 pages = get_order(dd->total_save);
686 free_pages((unsigned long)buf_in, pages);
687 free_pages((unsigned long)buf_out, pages);
688 }
689
690 omap_des_finish_req(dd, 0);
691 omap_des_handle_queue(dd, NULL);
692
693 pr_debug("exit\n");
694 }
695
696 static void omap_des_queue_task(unsigned long data)
697 {
698 struct omap_des_dev *dd = (struct omap_des_dev *)data;
699
700 omap_des_handle_queue(dd, NULL);
701 }
702
703 static int omap_des_crypt(struct ablkcipher_request *req, unsigned long mode)
704 {
705 struct omap_des_ctx *ctx = crypto_ablkcipher_ctx(
706 crypto_ablkcipher_reqtfm(req));
707 struct omap_des_reqctx *rctx = ablkcipher_request_ctx(req);
708 struct omap_des_dev *dd;
709
710 pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->nbytes,
711 !!(mode & FLAGS_ENCRYPT),
712 !!(mode & FLAGS_CBC));
713
714 if (!IS_ALIGNED(req->nbytes, DES_BLOCK_SIZE)) {
715 pr_err("request size is not exact amount of DES blocks\n");
716 return -EINVAL;
717 }
718
719 dd = omap_des_find_dev(ctx);
720 if (!dd)
721 return -ENODEV;
722
723 rctx->mode = mode;
724
725 return omap_des_handle_queue(dd, req);
726 }
727
728 /* ********************** ALG API ************************************ */
729
730 static int omap_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
731 unsigned int keylen)
732 {
733 struct omap_des_ctx *ctx = crypto_ablkcipher_ctx(tfm);
734
735 if (keylen != DES_KEY_SIZE && keylen != (3*DES_KEY_SIZE))
736 return -EINVAL;
737
738 pr_debug("enter, keylen: %d\n", keylen);
739
740 memcpy(ctx->key, key, keylen);
741 ctx->keylen = keylen;
742
743 return 0;
744 }
745
746 static int omap_des_ecb_encrypt(struct ablkcipher_request *req)
747 {
748 return omap_des_crypt(req, FLAGS_ENCRYPT);
749 }
750
751 static int omap_des_ecb_decrypt(struct ablkcipher_request *req)
752 {
753 return omap_des_crypt(req, 0);
754 }
755
756 static int omap_des_cbc_encrypt(struct ablkcipher_request *req)
757 {
758 return omap_des_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
759 }
760
761 static int omap_des_cbc_decrypt(struct ablkcipher_request *req)
762 {
763 return omap_des_crypt(req, FLAGS_CBC);
764 }
765
766 static int omap_des_cra_init(struct crypto_tfm *tfm)
767 {
768 pr_debug("enter\n");
769
770 tfm->crt_ablkcipher.reqsize = sizeof(struct omap_des_reqctx);
771
772 return 0;
773 }
774
775 static void omap_des_cra_exit(struct crypto_tfm *tfm)
776 {
777 pr_debug("enter\n");
778 }
779
780 /* ********************** ALGS ************************************ */
781
782 static struct crypto_alg algs_ecb_cbc[] = {
783 {
784 .cra_name = "ecb(des)",
785 .cra_driver_name = "ecb-des-omap",
786 .cra_priority = 100,
787 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
788 CRYPTO_ALG_KERN_DRIVER_ONLY |
789 CRYPTO_ALG_ASYNC,
790 .cra_blocksize = DES_BLOCK_SIZE,
791 .cra_ctxsize = sizeof(struct omap_des_ctx),
792 .cra_alignmask = 0,
793 .cra_type = &crypto_ablkcipher_type,
794 .cra_module = THIS_MODULE,
795 .cra_init = omap_des_cra_init,
796 .cra_exit = omap_des_cra_exit,
797 .cra_u.ablkcipher = {
798 .min_keysize = DES_KEY_SIZE,
799 .max_keysize = DES_KEY_SIZE,
800 .setkey = omap_des_setkey,
801 .encrypt = omap_des_ecb_encrypt,
802 .decrypt = omap_des_ecb_decrypt,
803 }
804 },
805 {
806 .cra_name = "cbc(des)",
807 .cra_driver_name = "cbc-des-omap",
808 .cra_priority = 100,
809 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
810 CRYPTO_ALG_KERN_DRIVER_ONLY |
811 CRYPTO_ALG_ASYNC,
812 .cra_blocksize = DES_BLOCK_SIZE,
813 .cra_ctxsize = sizeof(struct omap_des_ctx),
814 .cra_alignmask = 0,
815 .cra_type = &crypto_ablkcipher_type,
816 .cra_module = THIS_MODULE,
817 .cra_init = omap_des_cra_init,
818 .cra_exit = omap_des_cra_exit,
819 .cra_u.ablkcipher = {
820 .min_keysize = DES_KEY_SIZE,
821 .max_keysize = DES_KEY_SIZE,
822 .ivsize = DES_BLOCK_SIZE,
823 .setkey = omap_des_setkey,
824 .encrypt = omap_des_cbc_encrypt,
825 .decrypt = omap_des_cbc_decrypt,
826 }
827 },
828 {
829 .cra_name = "ecb(des3_ede)",
830 .cra_driver_name = "ecb-des3-omap",
831 .cra_priority = 100,
832 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
833 CRYPTO_ALG_KERN_DRIVER_ONLY |
834 CRYPTO_ALG_ASYNC,
835 .cra_blocksize = DES_BLOCK_SIZE,
836 .cra_ctxsize = sizeof(struct omap_des_ctx),
837 .cra_alignmask = 0,
838 .cra_type = &crypto_ablkcipher_type,
839 .cra_module = THIS_MODULE,
840 .cra_init = omap_des_cra_init,
841 .cra_exit = omap_des_cra_exit,
842 .cra_u.ablkcipher = {
843 .min_keysize = 3*DES_KEY_SIZE,
844 .max_keysize = 3*DES_KEY_SIZE,
845 .setkey = omap_des_setkey,
846 .encrypt = omap_des_ecb_encrypt,
847 .decrypt = omap_des_ecb_decrypt,
848 }
849 },
850 {
851 .cra_name = "cbc(des3_ede)",
852 .cra_driver_name = "cbc-des3-omap",
853 .cra_priority = 100,
854 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
855 CRYPTO_ALG_KERN_DRIVER_ONLY |
856 CRYPTO_ALG_ASYNC,
857 .cra_blocksize = DES_BLOCK_SIZE,
858 .cra_ctxsize = sizeof(struct omap_des_ctx),
859 .cra_alignmask = 0,
860 .cra_type = &crypto_ablkcipher_type,
861 .cra_module = THIS_MODULE,
862 .cra_init = omap_des_cra_init,
863 .cra_exit = omap_des_cra_exit,
864 .cra_u.ablkcipher = {
865 .min_keysize = 3*DES_KEY_SIZE,
866 .max_keysize = 3*DES_KEY_SIZE,
867 .ivsize = DES_BLOCK_SIZE,
868 .setkey = omap_des_setkey,
869 .encrypt = omap_des_cbc_encrypt,
870 .decrypt = omap_des_cbc_decrypt,
871 }
872 }
873 };
874
875 static struct omap_des_algs_info omap_des_algs_info_ecb_cbc[] = {
876 {
877 .algs_list = algs_ecb_cbc,
878 .size = ARRAY_SIZE(algs_ecb_cbc),
879 },
880 };
881
882 #ifdef CONFIG_OF
883 static const struct omap_des_pdata omap_des_pdata_omap4 = {
884 .algs_info = omap_des_algs_info_ecb_cbc,
885 .algs_info_size = ARRAY_SIZE(omap_des_algs_info_ecb_cbc),
886 .trigger = omap_des_dma_trigger_omap4,
887 .key_ofs = 0x14,
888 .iv_ofs = 0x18,
889 .ctrl_ofs = 0x20,
890 .data_ofs = 0x28,
891 .rev_ofs = 0x30,
892 .mask_ofs = 0x34,
893 .irq_status_ofs = 0x3c,
894 .irq_enable_ofs = 0x40,
895 .dma_enable_in = BIT(5),
896 .dma_enable_out = BIT(6),
897 .major_mask = 0x0700,
898 .major_shift = 8,
899 .minor_mask = 0x003f,
900 .minor_shift = 0,
901 };
902
903 static irqreturn_t omap_des_irq(int irq, void *dev_id)
904 {
905 struct omap_des_dev *dd = dev_id;
906 u32 status, i;
907 u32 *src, *dst;
908
909 status = omap_des_read(dd, DES_REG_IRQ_STATUS(dd));
910 if (status & DES_REG_IRQ_DATA_IN) {
911 omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x0);
912
913 BUG_ON(!dd->in_sg);
914
915 BUG_ON(_calc_walked(in) > dd->in_sg->length);
916
917 src = sg_virt(dd->in_sg) + _calc_walked(in);
918
919 for (i = 0; i < DES_BLOCK_WORDS; i++) {
920 omap_des_write(dd, DES_REG_DATA_N(dd, i), *src);
921
922 scatterwalk_advance(&dd->in_walk, 4);
923 if (dd->in_sg->length == _calc_walked(in)) {
924 dd->in_sg = sg_next(dd->in_sg);
925 if (dd->in_sg) {
926 scatterwalk_start(&dd->in_walk,
927 dd->in_sg);
928 src = sg_virt(dd->in_sg) +
929 _calc_walked(in);
930 }
931 } else {
932 src++;
933 }
934 }
935
936 /* Clear IRQ status */
937 status &= ~DES_REG_IRQ_DATA_IN;
938 omap_des_write(dd, DES_REG_IRQ_STATUS(dd), status);
939
940 /* Enable DATA_OUT interrupt */
941 omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x4);
942
943 } else if (status & DES_REG_IRQ_DATA_OUT) {
944 omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x0);
945
946 BUG_ON(!dd->out_sg);
947
948 BUG_ON(_calc_walked(out) > dd->out_sg->length);
949
950 dst = sg_virt(dd->out_sg) + _calc_walked(out);
951
952 for (i = 0; i < DES_BLOCK_WORDS; i++) {
953 *dst = omap_des_read(dd, DES_REG_DATA_N(dd, i));
954 scatterwalk_advance(&dd->out_walk, 4);
955 if (dd->out_sg->length == _calc_walked(out)) {
956 dd->out_sg = sg_next(dd->out_sg);
957 if (dd->out_sg) {
958 scatterwalk_start(&dd->out_walk,
959 dd->out_sg);
960 dst = sg_virt(dd->out_sg) +
961 _calc_walked(out);
962 }
963 } else {
964 dst++;
965 }
966 }
967
968 BUG_ON(dd->total < DES_BLOCK_SIZE);
969
970 dd->total -= DES_BLOCK_SIZE;
971
972 /* Clear IRQ status */
973 status &= ~DES_REG_IRQ_DATA_OUT;
974 omap_des_write(dd, DES_REG_IRQ_STATUS(dd), status);
975
976 if (!dd->total)
977 /* All bytes read! */
978 tasklet_schedule(&dd->done_task);
979 else
980 /* Enable DATA_IN interrupt for next block */
981 omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x2);
982 }
983
984 return IRQ_HANDLED;
985 }
986
987 static const struct of_device_id omap_des_of_match[] = {
988 {
989 .compatible = "ti,omap4-des",
990 .data = &omap_des_pdata_omap4,
991 },
992 {},
993 };
994 MODULE_DEVICE_TABLE(of, omap_des_of_match);
995
996 static int omap_des_get_of(struct omap_des_dev *dd,
997 struct platform_device *pdev)
998 {
999 const struct of_device_id *match;
1000
1001 match = of_match_device(of_match_ptr(omap_des_of_match), &pdev->dev);
1002 if (!match) {
1003 dev_err(&pdev->dev, "no compatible OF match\n");
1004 return -EINVAL;
1005 }
1006
1007 dd->dma_out = -1; /* Dummy value that's unused */
1008 dd->dma_in = -1; /* Dummy value that's unused */
1009 dd->pdata = match->data;
1010
1011 return 0;
1012 }
1013 #else
1014 static int omap_des_get_of(struct omap_des_dev *dd,
1015 struct device *dev)
1016 {
1017 return -EINVAL;
1018 }
1019 #endif
1020
1021 static int omap_des_get_pdev(struct omap_des_dev *dd,
1022 struct platform_device *pdev)
1023 {
1024 struct device *dev = &pdev->dev;
1025 struct resource *r;
1026 int err = 0;
1027
1028 /* Get the DMA out channel */
1029 r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1030 if (!r) {
1031 dev_err(dev, "no DMA out resource info\n");
1032 err = -ENODEV;
1033 goto err;
1034 }
1035 dd->dma_out = r->start;
1036
1037 /* Get the DMA in channel */
1038 r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1039 if (!r) {
1040 dev_err(dev, "no DMA in resource info\n");
1041 err = -ENODEV;
1042 goto err;
1043 }
1044 dd->dma_in = r->start;
1045
1046 /* non-DT devices get pdata from pdev */
1047 dd->pdata = pdev->dev.platform_data;
1048
1049 err:
1050 return err;
1051 }
1052
1053 static int omap_des_probe(struct platform_device *pdev)
1054 {
1055 struct device *dev = &pdev->dev;
1056 struct omap_des_dev *dd;
1057 struct crypto_alg *algp;
1058 struct resource *res;
1059 int err = -ENOMEM, i, j, irq = -1;
1060 u32 reg;
1061
1062 dd = devm_kzalloc(dev, sizeof(struct omap_des_dev), GFP_KERNEL);
1063 if (dd == NULL) {
1064 dev_err(dev, "unable to alloc data struct.\n");
1065 goto err_data;
1066 }
1067 dd->dev = dev;
1068 platform_set_drvdata(pdev, dd);
1069
1070 spin_lock_init(&dd->lock);
1071 crypto_init_queue(&dd->queue, OMAP_DES_QUEUE_LENGTH);
1072
1073 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1074 if (!res) {
1075 dev_err(dev, "no MEM resource info\n");
1076 goto err_res;
1077 }
1078
1079 err = (dev->of_node) ? omap_des_get_of(dd, pdev) :
1080 omap_des_get_pdev(dd, pdev);
1081 if (err)
1082 goto err_res;
1083
1084 dd->io_base = devm_ioremap_resource(dev, res);
1085 if (IS_ERR(dd->io_base)) {
1086 err = PTR_ERR(dd->io_base);
1087 goto err_res;
1088 }
1089 dd->phys_base = res->start;
1090
1091 pm_runtime_enable(dev);
1092 err = pm_runtime_get_sync(dev);
1093 if (err < 0) {
1094 pm_runtime_put_noidle(dev);
1095 dev_err(dd->dev, "%s: failed to get_sync(%d)\n", __func__, err);
1096 goto err_get;
1097 }
1098
1099 omap_des_dma_stop(dd);
1100
1101 reg = omap_des_read(dd, DES_REG_REV(dd));
1102
1103 pm_runtime_put_sync(dev);
1104
1105 dev_info(dev, "OMAP DES hw accel rev: %u.%u\n",
1106 (reg & dd->pdata->major_mask) >> dd->pdata->major_shift,
1107 (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
1108
1109 tasklet_init(&dd->done_task, omap_des_done_task, (unsigned long)dd);
1110 tasklet_init(&dd->queue_task, omap_des_queue_task, (unsigned long)dd);
1111
1112 err = omap_des_dma_init(dd);
1113 if (err && DES_REG_IRQ_STATUS(dd) && DES_REG_IRQ_ENABLE(dd)) {
1114 dd->pio_only = 1;
1115
1116 irq = platform_get_irq(pdev, 0);
1117 if (irq < 0) {
1118 dev_err(dev, "can't get IRQ resource\n");
1119 goto err_irq;
1120 }
1121
1122 err = devm_request_irq(dev, irq, omap_des_irq, 0,
1123 dev_name(dev), dd);
1124 if (err) {
1125 dev_err(dev, "Unable to grab omap-des IRQ\n");
1126 goto err_irq;
1127 }
1128 }
1129
1130
1131 INIT_LIST_HEAD(&dd->list);
1132 spin_lock(&list_lock);
1133 list_add_tail(&dd->list, &dev_list);
1134 spin_unlock(&list_lock);
1135
1136 for (i = 0; i < dd->pdata->algs_info_size; i++) {
1137 for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
1138 algp = &dd->pdata->algs_info[i].algs_list[j];
1139
1140 pr_debug("reg alg: %s\n", algp->cra_name);
1141 INIT_LIST_HEAD(&algp->cra_list);
1142
1143 err = crypto_register_alg(algp);
1144 if (err)
1145 goto err_algs;
1146
1147 dd->pdata->algs_info[i].registered++;
1148 }
1149 }
1150
1151 return 0;
1152 err_algs:
1153 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1154 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1155 crypto_unregister_alg(
1156 &dd->pdata->algs_info[i].algs_list[j]);
1157 if (!dd->pio_only)
1158 omap_des_dma_cleanup(dd);
1159 err_irq:
1160 tasklet_kill(&dd->done_task);
1161 tasklet_kill(&dd->queue_task);
1162 err_get:
1163 pm_runtime_disable(dev);
1164 err_res:
1165 dd = NULL;
1166 err_data:
1167 dev_err(dev, "initialization failed.\n");
1168 return err;
1169 }
1170
1171 static int omap_des_remove(struct platform_device *pdev)
1172 {
1173 struct omap_des_dev *dd = platform_get_drvdata(pdev);
1174 int i, j;
1175
1176 if (!dd)
1177 return -ENODEV;
1178
1179 spin_lock(&list_lock);
1180 list_del(&dd->list);
1181 spin_unlock(&list_lock);
1182
1183 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1184 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1185 crypto_unregister_alg(
1186 &dd->pdata->algs_info[i].algs_list[j]);
1187
1188 tasklet_kill(&dd->done_task);
1189 tasklet_kill(&dd->queue_task);
1190 omap_des_dma_cleanup(dd);
1191 pm_runtime_disable(dd->dev);
1192 dd = NULL;
1193
1194 return 0;
1195 }
1196
1197 #ifdef CONFIG_PM_SLEEP
1198 static int omap_des_suspend(struct device *dev)
1199 {
1200 pm_runtime_put_sync(dev);
1201 return 0;
1202 }
1203
1204 static int omap_des_resume(struct device *dev)
1205 {
1206 int err;
1207
1208 err = pm_runtime_get_sync(dev);
1209 if (err < 0) {
1210 pm_runtime_put_noidle(dev);
1211 dev_err(dev, "%s: failed to get_sync(%d)\n", __func__, err);
1212 return err;
1213 }
1214 return 0;
1215 }
1216 #endif
1217
1218 static SIMPLE_DEV_PM_OPS(omap_des_pm_ops, omap_des_suspend, omap_des_resume);
1219
1220 static struct platform_driver omap_des_driver = {
1221 .probe = omap_des_probe,
1222 .remove = omap_des_remove,
1223 .driver = {
1224 .name = "omap-des",
1225 .pm = &omap_des_pm_ops,
1226 .of_match_table = of_match_ptr(omap_des_of_match),
1227 },
1228 };
1229
1230 module_platform_driver(omap_des_driver);
1231
1232 MODULE_DESCRIPTION("OMAP DES hw acceleration support.");
1233 MODULE_LICENSE("GPL v2");
1234 MODULE_AUTHOR("Joel Fernandes <joelf@ti.com>");
Linux with added FPC-III support