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[thirdparty/kernel/linux.git] / drivers / crypto / omap-des.c
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/pm_runtime.h>
33 #include <linux/of.h>
34 #include <linux/of_device.h>
35 #include <linux/of_address.h>
36 #include <linux/io.h>
37 #include <linux/crypto.h>
38 #include <linux/interrupt.h>
39 #include <crypto/scatterwalk.h>
40 #include <crypto/des.h>
41 #include <crypto/algapi.h>
42 #include <crypto/engine.h>
43
44 #include "omap-crypto.h"
45
46 #define DST_MAXBURST 2
47
48 #define DES_BLOCK_WORDS (DES_BLOCK_SIZE >> 2)
49
50 #define _calc_walked(inout) (dd->inout##_walk.offset - dd->inout##_sg->offset)
51
52 #define DES_REG_KEY(dd, x) ((dd)->pdata->key_ofs - \
53 ((x ^ 0x01) * 0x04))
54
55 #define DES_REG_IV(dd, x) ((dd)->pdata->iv_ofs + ((x) * 0x04))
56
57 #define DES_REG_CTRL(dd) ((dd)->pdata->ctrl_ofs)
58 #define DES_REG_CTRL_CBC BIT(4)
59 #define DES_REG_CTRL_TDES BIT(3)
60 #define DES_REG_CTRL_DIRECTION BIT(2)
61 #define DES_REG_CTRL_INPUT_READY BIT(1)
62 #define DES_REG_CTRL_OUTPUT_READY BIT(0)
63
64 #define DES_REG_DATA_N(dd, x) ((dd)->pdata->data_ofs + ((x) * 0x04))
65
66 #define DES_REG_REV(dd) ((dd)->pdata->rev_ofs)
67
68 #define DES_REG_MASK(dd) ((dd)->pdata->mask_ofs)
69
70 #define DES_REG_LENGTH_N(x) (0x24 + ((x) * 0x04))
71
72 #define DES_REG_IRQ_STATUS(dd) ((dd)->pdata->irq_status_ofs)
73 #define DES_REG_IRQ_ENABLE(dd) ((dd)->pdata->irq_enable_ofs)
74 #define DES_REG_IRQ_DATA_IN BIT(1)
75 #define DES_REG_IRQ_DATA_OUT BIT(2)
76
77 #define FLAGS_MODE_MASK 0x000f
78 #define FLAGS_ENCRYPT BIT(0)
79 #define FLAGS_CBC BIT(1)
80 #define FLAGS_INIT BIT(4)
81 #define FLAGS_BUSY BIT(6)
82
83 #define DEFAULT_AUTOSUSPEND_DELAY 1000
84
85 #define FLAGS_IN_DATA_ST_SHIFT 8
86 #define FLAGS_OUT_DATA_ST_SHIFT 10
87
88 struct omap_des_ctx {
89 struct omap_des_dev *dd;
90
91 int keylen;
92 u32 key[(3 * DES_KEY_SIZE) / sizeof(u32)];
93 unsigned long flags;
94 };
95
96 struct omap_des_reqctx {
97 unsigned long mode;
98 };
99
100 #define OMAP_DES_QUEUE_LENGTH 1
101 #define OMAP_DES_CACHE_SIZE 0
102
103 struct omap_des_algs_info {
104 struct crypto_alg *algs_list;
105 unsigned int size;
106 unsigned int registered;
107 };
108
109 struct omap_des_pdata {
110 struct omap_des_algs_info *algs_info;
111 unsigned int algs_info_size;
112
113 void (*trigger)(struct omap_des_dev *dd, int length);
114
115 u32 key_ofs;
116 u32 iv_ofs;
117 u32 ctrl_ofs;
118 u32 data_ofs;
119 u32 rev_ofs;
120 u32 mask_ofs;
121 u32 irq_enable_ofs;
122 u32 irq_status_ofs;
123
124 u32 dma_enable_in;
125 u32 dma_enable_out;
126 u32 dma_start;
127
128 u32 major_mask;
129 u32 major_shift;
130 u32 minor_mask;
131 u32 minor_shift;
132 };
133
134 struct omap_des_dev {
135 struct list_head list;
136 unsigned long phys_base;
137 void __iomem *io_base;
138 struct omap_des_ctx *ctx;
139 struct device *dev;
140 unsigned long flags;
141 int err;
142
143 struct tasklet_struct done_task;
144
145 struct ablkcipher_request *req;
146 struct crypto_engine *engine;
147 /*
148 * total is used by PIO mode for book keeping so introduce
149 * variable total_save as need it to calc page_order
150 */
151 size_t total;
152 size_t total_save;
153
154 struct scatterlist *in_sg;
155 struct scatterlist *out_sg;
156
157 /* Buffers for copying for unaligned cases */
158 struct scatterlist in_sgl;
159 struct scatterlist out_sgl;
160 struct scatterlist *orig_out;
161
162 struct scatter_walk in_walk;
163 struct scatter_walk out_walk;
164 struct dma_chan *dma_lch_in;
165 struct dma_chan *dma_lch_out;
166 int in_sg_len;
167 int out_sg_len;
168 int pio_only;
169 const struct omap_des_pdata *pdata;
170 };
171
172 /* keep registered devices data here */
173 static LIST_HEAD(dev_list);
174 static DEFINE_SPINLOCK(list_lock);
175
176 #ifdef DEBUG
177 #define omap_des_read(dd, offset) \
178 ({ \
179 int _read_ret; \
180 _read_ret = __raw_readl(dd->io_base + offset); \
181 pr_err("omap_des_read(" #offset "=%#x)= %#x\n", \
182 offset, _read_ret); \
183 _read_ret; \
184 })
185 #else
186 static inline u32 omap_des_read(struct omap_des_dev *dd, u32 offset)
187 {
188 return __raw_readl(dd->io_base + offset);
189 }
190 #endif
191
192 #ifdef DEBUG
193 #define omap_des_write(dd, offset, value) \
194 do { \
195 pr_err("omap_des_write(" #offset "=%#x) value=%#x\n", \
196 offset, value); \
197 __raw_writel(value, dd->io_base + offset); \
198 } while (0)
199 #else
200 static inline void omap_des_write(struct omap_des_dev *dd, u32 offset,
201 u32 value)
202 {
203 __raw_writel(value, dd->io_base + offset);
204 }
205 #endif
206
207 static inline void omap_des_write_mask(struct omap_des_dev *dd, u32 offset,
208 u32 value, u32 mask)
209 {
210 u32 val;
211
212 val = omap_des_read(dd, offset);
213 val &= ~mask;
214 val |= value;
215 omap_des_write(dd, offset, val);
216 }
217
218 static void omap_des_write_n(struct omap_des_dev *dd, u32 offset,
219 u32 *value, int count)
220 {
221 for (; count--; value++, offset += 4)
222 omap_des_write(dd, offset, *value);
223 }
224
225 static int omap_des_hw_init(struct omap_des_dev *dd)
226 {
227 int err;
228
229 /*
230 * clocks are enabled when request starts and disabled when finished.
231 * It may be long delays between requests.
232 * Device might go to off mode to save power.
233 */
234 err = pm_runtime_get_sync(dd->dev);
235 if (err < 0) {
236 pm_runtime_put_noidle(dd->dev);
237 dev_err(dd->dev, "%s: failed to get_sync(%d)\n", __func__, err);
238 return err;
239 }
240
241 if (!(dd->flags & FLAGS_INIT)) {
242 dd->flags |= FLAGS_INIT;
243 dd->err = 0;
244 }
245
246 return 0;
247 }
248
249 static int omap_des_write_ctrl(struct omap_des_dev *dd)
250 {
251 unsigned int key32;
252 int i, err;
253 u32 val = 0, mask = 0;
254
255 err = omap_des_hw_init(dd);
256 if (err)
257 return err;
258
259 key32 = dd->ctx->keylen / sizeof(u32);
260
261 /* it seems a key should always be set even if it has not changed */
262 for (i = 0; i < key32; i++) {
263 omap_des_write(dd, DES_REG_KEY(dd, i),
264 __le32_to_cpu(dd->ctx->key[i]));
265 }
266
267 if ((dd->flags & FLAGS_CBC) && dd->req->info)
268 omap_des_write_n(dd, DES_REG_IV(dd, 0), dd->req->info, 2);
269
270 if (dd->flags & FLAGS_CBC)
271 val |= DES_REG_CTRL_CBC;
272 if (dd->flags & FLAGS_ENCRYPT)
273 val |= DES_REG_CTRL_DIRECTION;
274 if (key32 == 6)
275 val |= DES_REG_CTRL_TDES;
276
277 mask |= DES_REG_CTRL_CBC | DES_REG_CTRL_DIRECTION | DES_REG_CTRL_TDES;
278
279 omap_des_write_mask(dd, DES_REG_CTRL(dd), val, mask);
280
281 return 0;
282 }
283
284 static void omap_des_dma_trigger_omap4(struct omap_des_dev *dd, int length)
285 {
286 u32 mask, val;
287
288 omap_des_write(dd, DES_REG_LENGTH_N(0), length);
289
290 val = dd->pdata->dma_start;
291
292 if (dd->dma_lch_out != NULL)
293 val |= dd->pdata->dma_enable_out;
294 if (dd->dma_lch_in != NULL)
295 val |= dd->pdata->dma_enable_in;
296
297 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
298 dd->pdata->dma_start;
299
300 omap_des_write_mask(dd, DES_REG_MASK(dd), val, mask);
301 }
302
303 static void omap_des_dma_stop(struct omap_des_dev *dd)
304 {
305 u32 mask;
306
307 mask = dd->pdata->dma_enable_out | dd->pdata->dma_enable_in |
308 dd->pdata->dma_start;
309
310 omap_des_write_mask(dd, DES_REG_MASK(dd), 0, mask);
311 }
312
313 static struct omap_des_dev *omap_des_find_dev(struct omap_des_ctx *ctx)
314 {
315 struct omap_des_dev *dd = NULL, *tmp;
316
317 spin_lock_bh(&list_lock);
318 if (!ctx->dd) {
319 list_for_each_entry(tmp, &dev_list, list) {
320 /* FIXME: take fist available des core */
321 dd = tmp;
322 break;
323 }
324 ctx->dd = dd;
325 } else {
326 /* already found before */
327 dd = ctx->dd;
328 }
329 spin_unlock_bh(&list_lock);
330
331 return dd;
332 }
333
334 static void omap_des_dma_out_callback(void *data)
335 {
336 struct omap_des_dev *dd = data;
337
338 /* dma_lch_out - completed */
339 tasklet_schedule(&dd->done_task);
340 }
341
342 static int omap_des_dma_init(struct omap_des_dev *dd)
343 {
344 int err;
345
346 dd->dma_lch_out = NULL;
347 dd->dma_lch_in = NULL;
348
349 dd->dma_lch_in = dma_request_chan(dd->dev, "rx");
350 if (IS_ERR(dd->dma_lch_in)) {
351 dev_err(dd->dev, "Unable to request in DMA channel\n");
352 return PTR_ERR(dd->dma_lch_in);
353 }
354
355 dd->dma_lch_out = dma_request_chan(dd->dev, "tx");
356 if (IS_ERR(dd->dma_lch_out)) {
357 dev_err(dd->dev, "Unable to request out DMA channel\n");
358 err = PTR_ERR(dd->dma_lch_out);
359 goto err_dma_out;
360 }
361
362 return 0;
363
364 err_dma_out:
365 dma_release_channel(dd->dma_lch_in);
366
367 return err;
368 }
369
370 static void omap_des_dma_cleanup(struct omap_des_dev *dd)
371 {
372 if (dd->pio_only)
373 return;
374
375 dma_release_channel(dd->dma_lch_out);
376 dma_release_channel(dd->dma_lch_in);
377 }
378
379 static int omap_des_crypt_dma(struct crypto_tfm *tfm,
380 struct scatterlist *in_sg, struct scatterlist *out_sg,
381 int in_sg_len, int out_sg_len)
382 {
383 struct omap_des_ctx *ctx = crypto_tfm_ctx(tfm);
384 struct omap_des_dev *dd = ctx->dd;
385 struct dma_async_tx_descriptor *tx_in, *tx_out;
386 struct dma_slave_config cfg;
387 int ret;
388
389 if (dd->pio_only) {
390 scatterwalk_start(&dd->in_walk, dd->in_sg);
391 scatterwalk_start(&dd->out_walk, dd->out_sg);
392
393 /* Enable DATAIN interrupt and let it take
394 care of the rest */
395 omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x2);
396 return 0;
397 }
398
399 dma_sync_sg_for_device(dd->dev, dd->in_sg, in_sg_len, DMA_TO_DEVICE);
400
401 memset(&cfg, 0, sizeof(cfg));
402
403 cfg.src_addr = dd->phys_base + DES_REG_DATA_N(dd, 0);
404 cfg.dst_addr = dd->phys_base + DES_REG_DATA_N(dd, 0);
405 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
406 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
407 cfg.src_maxburst = DST_MAXBURST;
408 cfg.dst_maxburst = DST_MAXBURST;
409
410 /* IN */
411 ret = dmaengine_slave_config(dd->dma_lch_in, &cfg);
412 if (ret) {
413 dev_err(dd->dev, "can't configure IN dmaengine slave: %d\n",
414 ret);
415 return ret;
416 }
417
418 tx_in = dmaengine_prep_slave_sg(dd->dma_lch_in, in_sg, in_sg_len,
419 DMA_MEM_TO_DEV,
420 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
421 if (!tx_in) {
422 dev_err(dd->dev, "IN prep_slave_sg() failed\n");
423 return -EINVAL;
424 }
425
426 /* No callback necessary */
427 tx_in->callback_param = dd;
428
429 /* OUT */
430 ret = dmaengine_slave_config(dd->dma_lch_out, &cfg);
431 if (ret) {
432 dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n",
433 ret);
434 return ret;
435 }
436
437 tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg, out_sg_len,
438 DMA_DEV_TO_MEM,
439 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
440 if (!tx_out) {
441 dev_err(dd->dev, "OUT prep_slave_sg() failed\n");
442 return -EINVAL;
443 }
444
445 tx_out->callback = omap_des_dma_out_callback;
446 tx_out->callback_param = dd;
447
448 dmaengine_submit(tx_in);
449 dmaengine_submit(tx_out);
450
451 dma_async_issue_pending(dd->dma_lch_in);
452 dma_async_issue_pending(dd->dma_lch_out);
453
454 /* start DMA */
455 dd->pdata->trigger(dd, dd->total);
456
457 return 0;
458 }
459
460 static int omap_des_crypt_dma_start(struct omap_des_dev *dd)
461 {
462 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(
463 crypto_ablkcipher_reqtfm(dd->req));
464 int err;
465
466 pr_debug("total: %d\n", dd->total);
467
468 if (!dd->pio_only) {
469 err = dma_map_sg(dd->dev, dd->in_sg, dd->in_sg_len,
470 DMA_TO_DEVICE);
471 if (!err) {
472 dev_err(dd->dev, "dma_map_sg() error\n");
473 return -EINVAL;
474 }
475
476 err = dma_map_sg(dd->dev, dd->out_sg, dd->out_sg_len,
477 DMA_FROM_DEVICE);
478 if (!err) {
479 dev_err(dd->dev, "dma_map_sg() error\n");
480 return -EINVAL;
481 }
482 }
483
484 err = omap_des_crypt_dma(tfm, dd->in_sg, dd->out_sg, dd->in_sg_len,
485 dd->out_sg_len);
486 if (err && !dd->pio_only) {
487 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
488 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
489 DMA_FROM_DEVICE);
490 }
491
492 return err;
493 }
494
495 static void omap_des_finish_req(struct omap_des_dev *dd, int err)
496 {
497 struct ablkcipher_request *req = dd->req;
498
499 pr_debug("err: %d\n", err);
500
501 crypto_finalize_cipher_request(dd->engine, req, err);
502
503 pm_runtime_mark_last_busy(dd->dev);
504 pm_runtime_put_autosuspend(dd->dev);
505 }
506
507 static int omap_des_crypt_dma_stop(struct omap_des_dev *dd)
508 {
509 pr_debug("total: %d\n", dd->total);
510
511 omap_des_dma_stop(dd);
512
513 dmaengine_terminate_all(dd->dma_lch_in);
514 dmaengine_terminate_all(dd->dma_lch_out);
515
516 return 0;
517 }
518
519 static int omap_des_handle_queue(struct omap_des_dev *dd,
520 struct ablkcipher_request *req)
521 {
522 if (req)
523 return crypto_transfer_cipher_request_to_engine(dd->engine, req);
524
525 return 0;
526 }
527
528 static int omap_des_prepare_req(struct crypto_engine *engine,
529 struct ablkcipher_request *req)
530 {
531 struct omap_des_ctx *ctx = crypto_ablkcipher_ctx(
532 crypto_ablkcipher_reqtfm(req));
533 struct omap_des_dev *dd = omap_des_find_dev(ctx);
534 struct omap_des_reqctx *rctx;
535 int ret;
536 u16 flags;
537
538 if (!dd)
539 return -ENODEV;
540
541 /* assign new request to device */
542 dd->req = req;
543 dd->total = req->nbytes;
544 dd->total_save = req->nbytes;
545 dd->in_sg = req->src;
546 dd->out_sg = req->dst;
547 dd->orig_out = req->dst;
548
549 flags = OMAP_CRYPTO_COPY_DATA;
550 if (req->src == req->dst)
551 flags |= OMAP_CRYPTO_FORCE_COPY;
552
553 ret = omap_crypto_align_sg(&dd->in_sg, dd->total, DES_BLOCK_SIZE,
554 &dd->in_sgl, flags,
555 FLAGS_IN_DATA_ST_SHIFT, &dd->flags);
556 if (ret)
557 return ret;
558
559 ret = omap_crypto_align_sg(&dd->out_sg, dd->total, DES_BLOCK_SIZE,
560 &dd->out_sgl, 0,
561 FLAGS_OUT_DATA_ST_SHIFT, &dd->flags);
562 if (ret)
563 return ret;
564
565 dd->in_sg_len = sg_nents_for_len(dd->in_sg, dd->total);
566 if (dd->in_sg_len < 0)
567 return dd->in_sg_len;
568
569 dd->out_sg_len = sg_nents_for_len(dd->out_sg, dd->total);
570 if (dd->out_sg_len < 0)
571 return dd->out_sg_len;
572
573 rctx = ablkcipher_request_ctx(req);
574 ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
575 rctx->mode &= FLAGS_MODE_MASK;
576 dd->flags = (dd->flags & ~FLAGS_MODE_MASK) | rctx->mode;
577
578 dd->ctx = ctx;
579 ctx->dd = dd;
580
581 return omap_des_write_ctrl(dd);
582 }
583
584 static int omap_des_crypt_req(struct crypto_engine *engine,
585 struct ablkcipher_request *req)
586 {
587 struct omap_des_ctx *ctx = crypto_ablkcipher_ctx(
588 crypto_ablkcipher_reqtfm(req));
589 struct omap_des_dev *dd = omap_des_find_dev(ctx);
590
591 if (!dd)
592 return -ENODEV;
593
594 return omap_des_crypt_dma_start(dd);
595 }
596
597 static void omap_des_done_task(unsigned long data)
598 {
599 struct omap_des_dev *dd = (struct omap_des_dev *)data;
600
601 pr_debug("enter done_task\n");
602
603 if (!dd->pio_only) {
604 dma_sync_sg_for_device(dd->dev, dd->out_sg, dd->out_sg_len,
605 DMA_FROM_DEVICE);
606 dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
607 dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
608 DMA_FROM_DEVICE);
609 omap_des_crypt_dma_stop(dd);
610 }
611
612 omap_crypto_cleanup(&dd->in_sgl, NULL, 0, dd->total_save,
613 FLAGS_IN_DATA_ST_SHIFT, dd->flags);
614
615 omap_crypto_cleanup(&dd->out_sgl, dd->orig_out, 0, dd->total_save,
616 FLAGS_OUT_DATA_ST_SHIFT, dd->flags);
617
618 omap_des_finish_req(dd, 0);
619
620 pr_debug("exit\n");
621 }
622
623 static int omap_des_crypt(struct ablkcipher_request *req, unsigned long mode)
624 {
625 struct omap_des_ctx *ctx = crypto_ablkcipher_ctx(
626 crypto_ablkcipher_reqtfm(req));
627 struct omap_des_reqctx *rctx = ablkcipher_request_ctx(req);
628 struct omap_des_dev *dd;
629
630 pr_debug("nbytes: %d, enc: %d, cbc: %d\n", req->nbytes,
631 !!(mode & FLAGS_ENCRYPT),
632 !!(mode & FLAGS_CBC));
633
634 if (!IS_ALIGNED(req->nbytes, DES_BLOCK_SIZE)) {
635 pr_err("request size is not exact amount of DES blocks\n");
636 return -EINVAL;
637 }
638
639 dd = omap_des_find_dev(ctx);
640 if (!dd)
641 return -ENODEV;
642
643 rctx->mode = mode;
644
645 return omap_des_handle_queue(dd, req);
646 }
647
648 /* ********************** ALG API ************************************ */
649
650 static int omap_des_setkey(struct crypto_ablkcipher *cipher, const u8 *key,
651 unsigned int keylen)
652 {
653 struct omap_des_ctx *ctx = crypto_ablkcipher_ctx(cipher);
654 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
655
656 if (keylen != DES_KEY_SIZE && keylen != (3*DES_KEY_SIZE))
657 return -EINVAL;
658
659 pr_debug("enter, keylen: %d\n", keylen);
660
661 /* Do we need to test against weak key? */
662 if (tfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY) {
663 u32 tmp[DES_EXPKEY_WORDS];
664 int ret = des_ekey(tmp, key);
665
666 if (!ret) {
667 tfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
668 return -EINVAL;
669 }
670 }
671
672 memcpy(ctx->key, key, keylen);
673 ctx->keylen = keylen;
674
675 return 0;
676 }
677
678 static int omap_des_ecb_encrypt(struct ablkcipher_request *req)
679 {
680 return omap_des_crypt(req, FLAGS_ENCRYPT);
681 }
682
683 static int omap_des_ecb_decrypt(struct ablkcipher_request *req)
684 {
685 return omap_des_crypt(req, 0);
686 }
687
688 static int omap_des_cbc_encrypt(struct ablkcipher_request *req)
689 {
690 return omap_des_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
691 }
692
693 static int omap_des_cbc_decrypt(struct ablkcipher_request *req)
694 {
695 return omap_des_crypt(req, FLAGS_CBC);
696 }
697
698 static int omap_des_cra_init(struct crypto_tfm *tfm)
699 {
700 pr_debug("enter\n");
701
702 tfm->crt_ablkcipher.reqsize = sizeof(struct omap_des_reqctx);
703
704 return 0;
705 }
706
707 static void omap_des_cra_exit(struct crypto_tfm *tfm)
708 {
709 pr_debug("enter\n");
710 }
711
712 /* ********************** ALGS ************************************ */
713
714 static struct crypto_alg algs_ecb_cbc[] = {
715 {
716 .cra_name = "ecb(des)",
717 .cra_driver_name = "ecb-des-omap",
718 .cra_priority = 100,
719 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
720 CRYPTO_ALG_KERN_DRIVER_ONLY |
721 CRYPTO_ALG_ASYNC,
722 .cra_blocksize = DES_BLOCK_SIZE,
723 .cra_ctxsize = sizeof(struct omap_des_ctx),
724 .cra_alignmask = 0,
725 .cra_type = &crypto_ablkcipher_type,
726 .cra_module = THIS_MODULE,
727 .cra_init = omap_des_cra_init,
728 .cra_exit = omap_des_cra_exit,
729 .cra_u.ablkcipher = {
730 .min_keysize = DES_KEY_SIZE,
731 .max_keysize = DES_KEY_SIZE,
732 .setkey = omap_des_setkey,
733 .encrypt = omap_des_ecb_encrypt,
734 .decrypt = omap_des_ecb_decrypt,
735 }
736 },
737 {
738 .cra_name = "cbc(des)",
739 .cra_driver_name = "cbc-des-omap",
740 .cra_priority = 100,
741 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
742 CRYPTO_ALG_KERN_DRIVER_ONLY |
743 CRYPTO_ALG_ASYNC,
744 .cra_blocksize = DES_BLOCK_SIZE,
745 .cra_ctxsize = sizeof(struct omap_des_ctx),
746 .cra_alignmask = 0,
747 .cra_type = &crypto_ablkcipher_type,
748 .cra_module = THIS_MODULE,
749 .cra_init = omap_des_cra_init,
750 .cra_exit = omap_des_cra_exit,
751 .cra_u.ablkcipher = {
752 .min_keysize = DES_KEY_SIZE,
753 .max_keysize = DES_KEY_SIZE,
754 .ivsize = DES_BLOCK_SIZE,
755 .setkey = omap_des_setkey,
756 .encrypt = omap_des_cbc_encrypt,
757 .decrypt = omap_des_cbc_decrypt,
758 }
759 },
760 {
761 .cra_name = "ecb(des3_ede)",
762 .cra_driver_name = "ecb-des3-omap",
763 .cra_priority = 100,
764 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
765 CRYPTO_ALG_KERN_DRIVER_ONLY |
766 CRYPTO_ALG_ASYNC,
767 .cra_blocksize = DES_BLOCK_SIZE,
768 .cra_ctxsize = sizeof(struct omap_des_ctx),
769 .cra_alignmask = 0,
770 .cra_type = &crypto_ablkcipher_type,
771 .cra_module = THIS_MODULE,
772 .cra_init = omap_des_cra_init,
773 .cra_exit = omap_des_cra_exit,
774 .cra_u.ablkcipher = {
775 .min_keysize = 3*DES_KEY_SIZE,
776 .max_keysize = 3*DES_KEY_SIZE,
777 .setkey = omap_des_setkey,
778 .encrypt = omap_des_ecb_encrypt,
779 .decrypt = omap_des_ecb_decrypt,
780 }
781 },
782 {
783 .cra_name = "cbc(des3_ede)",
784 .cra_driver_name = "cbc-des3-omap",
785 .cra_priority = 100,
786 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
787 CRYPTO_ALG_KERN_DRIVER_ONLY |
788 CRYPTO_ALG_ASYNC,
789 .cra_blocksize = DES_BLOCK_SIZE,
790 .cra_ctxsize = sizeof(struct omap_des_ctx),
791 .cra_alignmask = 0,
792 .cra_type = &crypto_ablkcipher_type,
793 .cra_module = THIS_MODULE,
794 .cra_init = omap_des_cra_init,
795 .cra_exit = omap_des_cra_exit,
796 .cra_u.ablkcipher = {
797 .min_keysize = 3*DES_KEY_SIZE,
798 .max_keysize = 3*DES_KEY_SIZE,
799 .ivsize = DES_BLOCK_SIZE,
800 .setkey = omap_des_setkey,
801 .encrypt = omap_des_cbc_encrypt,
802 .decrypt = omap_des_cbc_decrypt,
803 }
804 }
805 };
806
807 static struct omap_des_algs_info omap_des_algs_info_ecb_cbc[] = {
808 {
809 .algs_list = algs_ecb_cbc,
810 .size = ARRAY_SIZE(algs_ecb_cbc),
811 },
812 };
813
814 #ifdef CONFIG_OF
815 static const struct omap_des_pdata omap_des_pdata_omap4 = {
816 .algs_info = omap_des_algs_info_ecb_cbc,
817 .algs_info_size = ARRAY_SIZE(omap_des_algs_info_ecb_cbc),
818 .trigger = omap_des_dma_trigger_omap4,
819 .key_ofs = 0x14,
820 .iv_ofs = 0x18,
821 .ctrl_ofs = 0x20,
822 .data_ofs = 0x28,
823 .rev_ofs = 0x30,
824 .mask_ofs = 0x34,
825 .irq_status_ofs = 0x3c,
826 .irq_enable_ofs = 0x40,
827 .dma_enable_in = BIT(5),
828 .dma_enable_out = BIT(6),
829 .major_mask = 0x0700,
830 .major_shift = 8,
831 .minor_mask = 0x003f,
832 .minor_shift = 0,
833 };
834
835 static irqreturn_t omap_des_irq(int irq, void *dev_id)
836 {
837 struct omap_des_dev *dd = dev_id;
838 u32 status, i;
839 u32 *src, *dst;
840
841 status = omap_des_read(dd, DES_REG_IRQ_STATUS(dd));
842 if (status & DES_REG_IRQ_DATA_IN) {
843 omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x0);
844
845 BUG_ON(!dd->in_sg);
846
847 BUG_ON(_calc_walked(in) > dd->in_sg->length);
848
849 src = sg_virt(dd->in_sg) + _calc_walked(in);
850
851 for (i = 0; i < DES_BLOCK_WORDS; i++) {
852 omap_des_write(dd, DES_REG_DATA_N(dd, i), *src);
853
854 scatterwalk_advance(&dd->in_walk, 4);
855 if (dd->in_sg->length == _calc_walked(in)) {
856 dd->in_sg = sg_next(dd->in_sg);
857 if (dd->in_sg) {
858 scatterwalk_start(&dd->in_walk,
859 dd->in_sg);
860 src = sg_virt(dd->in_sg) +
861 _calc_walked(in);
862 }
863 } else {
864 src++;
865 }
866 }
867
868 /* Clear IRQ status */
869 status &= ~DES_REG_IRQ_DATA_IN;
870 omap_des_write(dd, DES_REG_IRQ_STATUS(dd), status);
871
872 /* Enable DATA_OUT interrupt */
873 omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x4);
874
875 } else if (status & DES_REG_IRQ_DATA_OUT) {
876 omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x0);
877
878 BUG_ON(!dd->out_sg);
879
880 BUG_ON(_calc_walked(out) > dd->out_sg->length);
881
882 dst = sg_virt(dd->out_sg) + _calc_walked(out);
883
884 for (i = 0; i < DES_BLOCK_WORDS; i++) {
885 *dst = omap_des_read(dd, DES_REG_DATA_N(dd, i));
886 scatterwalk_advance(&dd->out_walk, 4);
887 if (dd->out_sg->length == _calc_walked(out)) {
888 dd->out_sg = sg_next(dd->out_sg);
889 if (dd->out_sg) {
890 scatterwalk_start(&dd->out_walk,
891 dd->out_sg);
892 dst = sg_virt(dd->out_sg) +
893 _calc_walked(out);
894 }
895 } else {
896 dst++;
897 }
898 }
899
900 BUG_ON(dd->total < DES_BLOCK_SIZE);
901
902 dd->total -= DES_BLOCK_SIZE;
903
904 /* Clear IRQ status */
905 status &= ~DES_REG_IRQ_DATA_OUT;
906 omap_des_write(dd, DES_REG_IRQ_STATUS(dd), status);
907
908 if (!dd->total)
909 /* All bytes read! */
910 tasklet_schedule(&dd->done_task);
911 else
912 /* Enable DATA_IN interrupt for next block */
913 omap_des_write(dd, DES_REG_IRQ_ENABLE(dd), 0x2);
914 }
915
916 return IRQ_HANDLED;
917 }
918
919 static const struct of_device_id omap_des_of_match[] = {
920 {
921 .compatible = "ti,omap4-des",
922 .data = &omap_des_pdata_omap4,
923 },
924 {},
925 };
926 MODULE_DEVICE_TABLE(of, omap_des_of_match);
927
928 static int omap_des_get_of(struct omap_des_dev *dd,
929 struct platform_device *pdev)
930 {
931 const struct of_device_id *match;
932
933 match = of_match_device(of_match_ptr(omap_des_of_match), &pdev->dev);
934 if (!match) {
935 dev_err(&pdev->dev, "no compatible OF match\n");
936 return -EINVAL;
937 }
938
939 dd->pdata = match->data;
940
941 return 0;
942 }
943 #else
944 static int omap_des_get_of(struct omap_des_dev *dd,
945 struct device *dev)
946 {
947 return -EINVAL;
948 }
949 #endif
950
951 static int omap_des_get_pdev(struct omap_des_dev *dd,
952 struct platform_device *pdev)
953 {
954 /* non-DT devices get pdata from pdev */
955 dd->pdata = pdev->dev.platform_data;
956
957 return 0;
958 }
959
960 static int omap_des_probe(struct platform_device *pdev)
961 {
962 struct device *dev = &pdev->dev;
963 struct omap_des_dev *dd;
964 struct crypto_alg *algp;
965 struct resource *res;
966 int err = -ENOMEM, i, j, irq = -1;
967 u32 reg;
968
969 dd = devm_kzalloc(dev, sizeof(struct omap_des_dev), GFP_KERNEL);
970 if (dd == NULL) {
971 dev_err(dev, "unable to alloc data struct.\n");
972 goto err_data;
973 }
974 dd->dev = dev;
975 platform_set_drvdata(pdev, dd);
976
977 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
978 if (!res) {
979 dev_err(dev, "no MEM resource info\n");
980 goto err_res;
981 }
982
983 err = (dev->of_node) ? omap_des_get_of(dd, pdev) :
984 omap_des_get_pdev(dd, pdev);
985 if (err)
986 goto err_res;
987
988 dd->io_base = devm_ioremap_resource(dev, res);
989 if (IS_ERR(dd->io_base)) {
990 err = PTR_ERR(dd->io_base);
991 goto err_res;
992 }
993 dd->phys_base = res->start;
994
995 pm_runtime_use_autosuspend(dev);
996 pm_runtime_set_autosuspend_delay(dev, DEFAULT_AUTOSUSPEND_DELAY);
997
998 pm_runtime_enable(dev);
999 err = pm_runtime_get_sync(dev);
1000 if (err < 0) {
1001 pm_runtime_put_noidle(dev);
1002 dev_err(dd->dev, "%s: failed to get_sync(%d)\n", __func__, err);
1003 goto err_get;
1004 }
1005
1006 omap_des_dma_stop(dd);
1007
1008 reg = omap_des_read(dd, DES_REG_REV(dd));
1009
1010 pm_runtime_put_sync(dev);
1011
1012 dev_info(dev, "OMAP DES hw accel rev: %u.%u\n",
1013 (reg & dd->pdata->major_mask) >> dd->pdata->major_shift,
1014 (reg & dd->pdata->minor_mask) >> dd->pdata->minor_shift);
1015
1016 tasklet_init(&dd->done_task, omap_des_done_task, (unsigned long)dd);
1017
1018 err = omap_des_dma_init(dd);
1019 if (err == -EPROBE_DEFER) {
1020 goto err_irq;
1021 } else if (err && DES_REG_IRQ_STATUS(dd) && DES_REG_IRQ_ENABLE(dd)) {
1022 dd->pio_only = 1;
1023
1024 irq = platform_get_irq(pdev, 0);
1025 if (irq < 0) {
1026 dev_err(dev, "can't get IRQ resource: %d\n", irq);
1027 err = irq;
1028 goto err_irq;
1029 }
1030
1031 err = devm_request_irq(dev, irq, omap_des_irq, 0,
1032 dev_name(dev), dd);
1033 if (err) {
1034 dev_err(dev, "Unable to grab omap-des IRQ\n");
1035 goto err_irq;
1036 }
1037 }
1038
1039
1040 INIT_LIST_HEAD(&dd->list);
1041 spin_lock(&list_lock);
1042 list_add_tail(&dd->list, &dev_list);
1043 spin_unlock(&list_lock);
1044
1045 /* Initialize des crypto engine */
1046 dd->engine = crypto_engine_alloc_init(dev, 1);
1047 if (!dd->engine) {
1048 err = -ENOMEM;
1049 goto err_engine;
1050 }
1051
1052 dd->engine->prepare_cipher_request = omap_des_prepare_req;
1053 dd->engine->cipher_one_request = omap_des_crypt_req;
1054 err = crypto_engine_start(dd->engine);
1055 if (err)
1056 goto err_engine;
1057
1058 for (i = 0; i < dd->pdata->algs_info_size; i++) {
1059 for (j = 0; j < dd->pdata->algs_info[i].size; j++) {
1060 algp = &dd->pdata->algs_info[i].algs_list[j];
1061
1062 pr_debug("reg alg: %s\n", algp->cra_name);
1063 INIT_LIST_HEAD(&algp->cra_list);
1064
1065 err = crypto_register_alg(algp);
1066 if (err)
1067 goto err_algs;
1068
1069 dd->pdata->algs_info[i].registered++;
1070 }
1071 }
1072
1073 return 0;
1074
1075 err_algs:
1076 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1077 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1078 crypto_unregister_alg(
1079 &dd->pdata->algs_info[i].algs_list[j]);
1080
1081 err_engine:
1082 if (dd->engine)
1083 crypto_engine_exit(dd->engine);
1084
1085 omap_des_dma_cleanup(dd);
1086 err_irq:
1087 tasklet_kill(&dd->done_task);
1088 err_get:
1089 pm_runtime_disable(dev);
1090 err_res:
1091 dd = NULL;
1092 err_data:
1093 dev_err(dev, "initialization failed.\n");
1094 return err;
1095 }
1096
1097 static int omap_des_remove(struct platform_device *pdev)
1098 {
1099 struct omap_des_dev *dd = platform_get_drvdata(pdev);
1100 int i, j;
1101
1102 if (!dd)
1103 return -ENODEV;
1104
1105 spin_lock(&list_lock);
1106 list_del(&dd->list);
1107 spin_unlock(&list_lock);
1108
1109 for (i = dd->pdata->algs_info_size - 1; i >= 0; i--)
1110 for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
1111 crypto_unregister_alg(
1112 &dd->pdata->algs_info[i].algs_list[j]);
1113
1114 tasklet_kill(&dd->done_task);
1115 omap_des_dma_cleanup(dd);
1116 pm_runtime_disable(dd->dev);
1117 dd = NULL;
1118
1119 return 0;
1120 }
1121
1122 #ifdef CONFIG_PM_SLEEP
1123 static int omap_des_suspend(struct device *dev)
1124 {
1125 pm_runtime_put_sync(dev);
1126 return 0;
1127 }
1128
1129 static int omap_des_resume(struct device *dev)
1130 {
1131 int err;
1132
1133 err = pm_runtime_get_sync(dev);
1134 if (err < 0) {
1135 pm_runtime_put_noidle(dev);
1136 dev_err(dev, "%s: failed to get_sync(%d)\n", __func__, err);
1137 return err;
1138 }
1139 return 0;
1140 }
1141 #endif
1142
1143 static SIMPLE_DEV_PM_OPS(omap_des_pm_ops, omap_des_suspend, omap_des_resume);
1144
1145 static struct platform_driver omap_des_driver = {
1146 .probe = omap_des_probe,
1147 .remove = omap_des_remove,
1148 .driver = {
1149 .name = "omap-des",
1150 .pm = &omap_des_pm_ops,
1151 .of_match_table = of_match_ptr(omap_des_of_match),
1152 },
1153 };
1154
1155 module_platform_driver(omap_des_driver);
1156
1157 MODULE_DESCRIPTION("OMAP DES hw acceleration support.");
1158 MODULE_LICENSE("GPL v2");
1159 MODULE_AUTHOR("Joel Fernandes <joelf@ti.com>");
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