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net: move procfs code to net/core/net-procfs.c
[linux/fpc-iii.git] / drivers / crypto / omap-sham.c
blob90d34adc2a66ba36ccfce82142e154db04e87d83
1 /*
2 * Cryptographic API.
3 *
4 * Support for OMAP SHA1/MD5 HW acceleration.
5 *
6 * Copyright (c) 2010 Nokia Corporation
7 * Author: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as published
11 * by the Free Software Foundation.
12 *
13 * Some ideas are from old omap-sha1-md5.c driver.
14 */
15
16 #define pr_fmt(fmt) "%s: " fmt, __func__
17
18 #include <linux/err.h>
19 #include <linux/device.h>
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/errno.h>
23 #include <linux/interrupt.h>
24 #include <linux/kernel.h>
25 #include <linux/clk.h>
26 #include <linux/irq.h>
27 #include <linux/io.h>
28 #include <linux/platform_device.h>
29 #include <linux/scatterlist.h>
30 #include <linux/dma-mapping.h>
31 #include <linux/delay.h>
32 #include <linux/crypto.h>
33 #include <linux/cryptohash.h>
34 #include <crypto/scatterwalk.h>
35 #include <crypto/algapi.h>
36 #include <crypto/sha.h>
37 #include <crypto/hash.h>
38 #include <crypto/internal/hash.h>
39
40 #include <linux/omap-dma.h>
41 #include <mach/irqs.h>
42
43 #define SHA_REG_DIGEST(x) (0x00 + ((x) * 0x04))
44 #define SHA_REG_DIN(x) (0x1C + ((x) * 0x04))
45
46 #define SHA1_MD5_BLOCK_SIZE SHA1_BLOCK_SIZE
47 #define MD5_DIGEST_SIZE 16
48
49 #define SHA_REG_DIGCNT 0x14
50
51 #define SHA_REG_CTRL 0x18
52 #define SHA_REG_CTRL_LENGTH (0xFFFFFFFF << 5)
53 #define SHA_REG_CTRL_CLOSE_HASH (1 << 4)
54 #define SHA_REG_CTRL_ALGO_CONST (1 << 3)
55 #define SHA_REG_CTRL_ALGO (1 << 2)
56 #define SHA_REG_CTRL_INPUT_READY (1 << 1)
57 #define SHA_REG_CTRL_OUTPUT_READY (1 << 0)
58
59 #define SHA_REG_REV 0x5C
60 #define SHA_REG_REV_MAJOR 0xF0
61 #define SHA_REG_REV_MINOR 0x0F
62
63 #define SHA_REG_MASK 0x60
64 #define SHA_REG_MASK_DMA_EN (1 << 3)
65 #define SHA_REG_MASK_IT_EN (1 << 2)
66 #define SHA_REG_MASK_SOFTRESET (1 << 1)
67 #define SHA_REG_AUTOIDLE (1 << 0)
68
69 #define SHA_REG_SYSSTATUS 0x64
70 #define SHA_REG_SYSSTATUS_RESETDONE (1 << 0)
71
72 #define DEFAULT_TIMEOUT_INTERVAL HZ
73
74 /* mostly device flags */
75 #define FLAGS_BUSY 0
76 #define FLAGS_FINAL 1
77 #define FLAGS_DMA_ACTIVE 2
78 #define FLAGS_OUTPUT_READY 3
79 #define FLAGS_INIT 4
80 #define FLAGS_CPU 5
81 #define FLAGS_DMA_READY 6
82 /* context flags */
83 #define FLAGS_FINUP 16
84 #define FLAGS_SG 17
85 #define FLAGS_SHA1 18
86 #define FLAGS_HMAC 19
87 #define FLAGS_ERROR 20
88
89 #define OP_UPDATE 1
90 #define OP_FINAL 2
91
92 #define OMAP_ALIGN_MASK (sizeof(u32)-1)
93 #define OMAP_ALIGNED __attribute__((aligned(sizeof(u32))))
94
95 #define BUFLEN PAGE_SIZE
96
97 struct omap_sham_dev;
98
99 struct omap_sham_reqctx {
100 struct omap_sham_dev *dd;
101 unsigned long flags;
102 unsigned long op;
103
104 u8 digest[SHA1_DIGEST_SIZE] OMAP_ALIGNED;
105 size_t digcnt;
106 size_t bufcnt;
107 size_t buflen;
108 dma_addr_t dma_addr;
109
110 /* walk state */
111 struct scatterlist *sg;
112 unsigned int offset; /* offset in current sg */
113 unsigned int total; /* total request */
114
115 u8 buffer[0] OMAP_ALIGNED;
116 };
117
118 struct omap_sham_hmac_ctx {
119 struct crypto_shash *shash;
120 u8 ipad[SHA1_MD5_BLOCK_SIZE];
121 u8 opad[SHA1_MD5_BLOCK_SIZE];
122 };
123
124 struct omap_sham_ctx {
125 struct omap_sham_dev *dd;
126
127 unsigned long flags;
128
129 /* fallback stuff */
130 struct crypto_shash *fallback;
131
132 struct omap_sham_hmac_ctx base[0];
133 };
134
135 #define OMAP_SHAM_QUEUE_LENGTH 1
136
137 struct omap_sham_dev {
138 struct list_head list;
139 unsigned long phys_base;
140 struct device *dev;
141 void __iomem *io_base;
142 int irq;
143 struct clk *iclk;
144 spinlock_t lock;
145 int err;
146 int dma;
147 int dma_lch;
148 struct tasklet_struct done_task;
149
150 unsigned long flags;
151 struct crypto_queue queue;
152 struct ahash_request *req;
153 };
154
155 struct omap_sham_drv {
156 struct list_head dev_list;
157 spinlock_t lock;
158 unsigned long flags;
159 };
160
161 static struct omap_sham_drv sham = {
162 .dev_list = LIST_HEAD_INIT(sham.dev_list),
163 .lock = __SPIN_LOCK_UNLOCKED(sham.lock),
164 };
165
166 static inline u32 omap_sham_read(struct omap_sham_dev *dd, u32 offset)
167 {
168 return __raw_readl(dd->io_base + offset);
169 }
170
171 static inline void omap_sham_write(struct omap_sham_dev *dd,
172 u32 offset, u32 value)
173 {
174 __raw_writel(value, dd->io_base + offset);
175 }
176
177 static inline void omap_sham_write_mask(struct omap_sham_dev *dd, u32 address,
178 u32 value, u32 mask)
179 {
180 u32 val;
181
182 val = omap_sham_read(dd, address);
183 val &= ~mask;
184 val |= value;
185 omap_sham_write(dd, address, val);
186 }
187
188 static inline int omap_sham_wait(struct omap_sham_dev *dd, u32 offset, u32 bit)
189 {
190 unsigned long timeout = jiffies + DEFAULT_TIMEOUT_INTERVAL;
191
192 while (!(omap_sham_read(dd, offset) & bit)) {
193 if (time_is_before_jiffies(timeout))
194 return -ETIMEDOUT;
195 }
196
197 return 0;
198 }
199
200 static void omap_sham_copy_hash(struct ahash_request *req, int out)
201 {
202 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
203 u32 *hash = (u32 *)ctx->digest;
204 int i;
205
206 /* MD5 is almost unused. So copy sha1 size to reduce code */
207 for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(u32); i++) {
208 if (out)
209 hash[i] = omap_sham_read(ctx->dd,
210 SHA_REG_DIGEST(i));
211 else
212 omap_sham_write(ctx->dd,
213 SHA_REG_DIGEST(i), hash[i]);
214 }
215 }
216
217 static void omap_sham_copy_ready_hash(struct ahash_request *req)
218 {
219 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
220 u32 *in = (u32 *)ctx->digest;
221 u32 *hash = (u32 *)req->result;
222 int i;
223
224 if (!hash)
225 return;
226
227 if (likely(ctx->flags & BIT(FLAGS_SHA1))) {
228 /* SHA1 results are in big endian */
229 for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(u32); i++)
230 hash[i] = be32_to_cpu(in[i]);
231 } else {
232 /* MD5 results are in little endian */
233 for (i = 0; i < MD5_DIGEST_SIZE / sizeof(u32); i++)
234 hash[i] = le32_to_cpu(in[i]);
235 }
236 }
237
238 static int omap_sham_hw_init(struct omap_sham_dev *dd)
239 {
240 clk_enable(dd->iclk);
241
242 if (!test_bit(FLAGS_INIT, &dd->flags)) {
243 omap_sham_write_mask(dd, SHA_REG_MASK,
244 SHA_REG_MASK_SOFTRESET, SHA_REG_MASK_SOFTRESET);
245
246 if (omap_sham_wait(dd, SHA_REG_SYSSTATUS,
247 SHA_REG_SYSSTATUS_RESETDONE))
248 return -ETIMEDOUT;
249
250 set_bit(FLAGS_INIT, &dd->flags);
251 dd->err = 0;
252 }
253
254 return 0;
255 }
256
257 static void omap_sham_write_ctrl(struct omap_sham_dev *dd, size_t length,
258 int final, int dma)
259 {
260 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
261 u32 val = length << 5, mask;
262
263 if (likely(ctx->digcnt))
264 omap_sham_write(dd, SHA_REG_DIGCNT, ctx->digcnt);
265
266 omap_sham_write_mask(dd, SHA_REG_MASK,
267 SHA_REG_MASK_IT_EN | (dma ? SHA_REG_MASK_DMA_EN : 0),
268 SHA_REG_MASK_IT_EN | SHA_REG_MASK_DMA_EN);
269 /*
270 * Setting ALGO_CONST only for the first iteration
271 * and CLOSE_HASH only for the last one.
272 */
273 if (ctx->flags & BIT(FLAGS_SHA1))
274 val |= SHA_REG_CTRL_ALGO;
275 if (!ctx->digcnt)
276 val |= SHA_REG_CTRL_ALGO_CONST;
277 if (final)
278 val |= SHA_REG_CTRL_CLOSE_HASH;
279
280 mask = SHA_REG_CTRL_ALGO_CONST | SHA_REG_CTRL_CLOSE_HASH |
281 SHA_REG_CTRL_ALGO | SHA_REG_CTRL_LENGTH;
282
283 omap_sham_write_mask(dd, SHA_REG_CTRL, val, mask);
284 }
285
286 static int omap_sham_xmit_cpu(struct omap_sham_dev *dd, const u8 *buf,
287 size_t length, int final)
288 {
289 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
290 int count, len32;
291 const u32 *buffer = (const u32 *)buf;
292
293 dev_dbg(dd->dev, "xmit_cpu: digcnt: %d, length: %d, final: %d\n",
294 ctx->digcnt, length, final);
295
296 omap_sham_write_ctrl(dd, length, final, 0);
297
298 /* should be non-zero before next lines to disable clocks later */
299 ctx->digcnt += length;
300
301 if (omap_sham_wait(dd, SHA_REG_CTRL, SHA_REG_CTRL_INPUT_READY))
302 return -ETIMEDOUT;
303
304 if (final)
305 set_bit(FLAGS_FINAL, &dd->flags); /* catch last interrupt */
306
307 set_bit(FLAGS_CPU, &dd->flags);
308
309 len32 = DIV_ROUND_UP(length, sizeof(u32));
310
311 for (count = 0; count < len32; count++)
312 omap_sham_write(dd, SHA_REG_DIN(count), buffer[count]);
313
314 return -EINPROGRESS;
315 }
316
317 static int omap_sham_xmit_dma(struct omap_sham_dev *dd, dma_addr_t dma_addr,
318 size_t length, int final)
319 {
320 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
321 int len32;
322
323 dev_dbg(dd->dev, "xmit_dma: digcnt: %d, length: %d, final: %d\n",
324 ctx->digcnt, length, final);
325
326 len32 = DIV_ROUND_UP(length, sizeof(u32));
327
328 omap_set_dma_transfer_params(dd->dma_lch, OMAP_DMA_DATA_TYPE_S32, len32,
329 1, OMAP_DMA_SYNC_PACKET, dd->dma,
330 OMAP_DMA_DST_SYNC_PREFETCH);
331
332 omap_set_dma_src_params(dd->dma_lch, 0, OMAP_DMA_AMODE_POST_INC,
333 dma_addr, 0, 0);
334
335 omap_sham_write_ctrl(dd, length, final, 1);
336
337 ctx->digcnt += length;
338
339 if (final)
340 set_bit(FLAGS_FINAL, &dd->flags); /* catch last interrupt */
341
342 set_bit(FLAGS_DMA_ACTIVE, &dd->flags);
343
344 omap_start_dma(dd->dma_lch);
345
346 return -EINPROGRESS;
347 }
348
349 static size_t omap_sham_append_buffer(struct omap_sham_reqctx *ctx,
350 const u8 *data, size_t length)
351 {
352 size_t count = min(length, ctx->buflen - ctx->bufcnt);
353
354 count = min(count, ctx->total);
355 if (count <= 0)
356 return 0;
357 memcpy(ctx->buffer + ctx->bufcnt, data, count);
358 ctx->bufcnt += count;
359
360 return count;
361 }
362
363 static size_t omap_sham_append_sg(struct omap_sham_reqctx *ctx)
364 {
365 size_t count;
366
367 while (ctx->sg) {
368 count = omap_sham_append_buffer(ctx,
369 sg_virt(ctx->sg) + ctx->offset,
370 ctx->sg->length - ctx->offset);
371 if (!count)
372 break;
373 ctx->offset += count;
374 ctx->total -= count;
375 if (ctx->offset == ctx->sg->length) {
376 ctx->sg = sg_next(ctx->sg);
377 if (ctx->sg)
378 ctx->offset = 0;
379 else
380 ctx->total = 0;
381 }
382 }
383
384 return 0;
385 }
386
387 static int omap_sham_xmit_dma_map(struct omap_sham_dev *dd,
388 struct omap_sham_reqctx *ctx,
389 size_t length, int final)
390 {
391 ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer, ctx->buflen,
392 DMA_TO_DEVICE);
393 if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
394 dev_err(dd->dev, "dma %u bytes error\n", ctx->buflen);
395 return -EINVAL;
396 }
397
398 ctx->flags &= ~BIT(FLAGS_SG);
399
400 /* next call does not fail... so no unmap in the case of error */
401 return omap_sham_xmit_dma(dd, ctx->dma_addr, length, final);
402 }
403
404 static int omap_sham_update_dma_slow(struct omap_sham_dev *dd)
405 {
406 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
407 unsigned int final;
408 size_t count;
409
410 omap_sham_append_sg(ctx);
411
412 final = (ctx->flags & BIT(FLAGS_FINUP)) && !ctx->total;
413
414 dev_dbg(dd->dev, "slow: bufcnt: %u, digcnt: %d, final: %d\n",
415 ctx->bufcnt, ctx->digcnt, final);
416
417 if (final || (ctx->bufcnt == ctx->buflen && ctx->total)) {
418 count = ctx->bufcnt;
419 ctx->bufcnt = 0;
420 return omap_sham_xmit_dma_map(dd, ctx, count, final);
421 }
422
423 return 0;
424 }
425
426 /* Start address alignment */
427 #define SG_AA(sg) (IS_ALIGNED(sg->offset, sizeof(u32)))
428 /* SHA1 block size alignment */
429 #define SG_SA(sg) (IS_ALIGNED(sg->length, SHA1_MD5_BLOCK_SIZE))
430
431 static int omap_sham_update_dma_start(struct omap_sham_dev *dd)
432 {
433 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
434 unsigned int length, final, tail;
435 struct scatterlist *sg;
436
437 if (!ctx->total)
438 return 0;
439
440 if (ctx->bufcnt || ctx->offset)
441 return omap_sham_update_dma_slow(dd);
442
443 dev_dbg(dd->dev, "fast: digcnt: %d, bufcnt: %u, total: %u\n",
444 ctx->digcnt, ctx->bufcnt, ctx->total);
445
446 sg = ctx->sg;
447
448 if (!SG_AA(sg))
449 return omap_sham_update_dma_slow(dd);
450
451 if (!sg_is_last(sg) && !SG_SA(sg))
452 /* size is not SHA1_BLOCK_SIZE aligned */
453 return omap_sham_update_dma_slow(dd);
454
455 length = min(ctx->total, sg->length);
456
457 if (sg_is_last(sg)) {
458 if (!(ctx->flags & BIT(FLAGS_FINUP))) {
459 /* not last sg must be SHA1_MD5_BLOCK_SIZE aligned */
460 tail = length & (SHA1_MD5_BLOCK_SIZE - 1);
461 /* without finup() we need one block to close hash */
462 if (!tail)
463 tail = SHA1_MD5_BLOCK_SIZE;
464 length -= tail;
465 }
466 }
467
468 if (!dma_map_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE)) {
469 dev_err(dd->dev, "dma_map_sg error\n");
470 return -EINVAL;
471 }
472
473 ctx->flags |= BIT(FLAGS_SG);
474
475 ctx->total -= length;
476 ctx->offset = length; /* offset where to start slow */
477
478 final = (ctx->flags & BIT(FLAGS_FINUP)) && !ctx->total;
479
480 /* next call does not fail... so no unmap in the case of error */
481 return omap_sham_xmit_dma(dd, sg_dma_address(ctx->sg), length, final);
482 }
483
484 static int omap_sham_update_cpu(struct omap_sham_dev *dd)
485 {
486 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
487 int bufcnt;
488
489 omap_sham_append_sg(ctx);
490 bufcnt = ctx->bufcnt;
491 ctx->bufcnt = 0;
492
493 return omap_sham_xmit_cpu(dd, ctx->buffer, bufcnt, 1);
494 }
495
496 static int omap_sham_update_dma_stop(struct omap_sham_dev *dd)
497 {
498 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
499
500 omap_stop_dma(dd->dma_lch);
501 if (ctx->flags & BIT(FLAGS_SG)) {
502 dma_unmap_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE);
503 if (ctx->sg->length == ctx->offset) {
504 ctx->sg = sg_next(ctx->sg);
505 if (ctx->sg)
506 ctx->offset = 0;
507 }
508 } else {
509 dma_unmap_single(dd->dev, ctx->dma_addr, ctx->buflen,
510 DMA_TO_DEVICE);
511 }
512
513 return 0;
514 }
515
516 static int omap_sham_init(struct ahash_request *req)
517 {
518 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
519 struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
520 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
521 struct omap_sham_dev *dd = NULL, *tmp;
522
523 spin_lock_bh(&sham.lock);
524 if (!tctx->dd) {
525 list_for_each_entry(tmp, &sham.dev_list, list) {
526 dd = tmp;
527 break;
528 }
529 tctx->dd = dd;
530 } else {
531 dd = tctx->dd;
532 }
533 spin_unlock_bh(&sham.lock);
534
535 ctx->dd = dd;
536
537 ctx->flags = 0;
538
539 dev_dbg(dd->dev, "init: digest size: %d\n",
540 crypto_ahash_digestsize(tfm));
541
542 if (crypto_ahash_digestsize(tfm) == SHA1_DIGEST_SIZE)
543 ctx->flags |= BIT(FLAGS_SHA1);
544
545 ctx->bufcnt = 0;
546 ctx->digcnt = 0;
547 ctx->buflen = BUFLEN;
548
549 if (tctx->flags & BIT(FLAGS_HMAC)) {
550 struct omap_sham_hmac_ctx *bctx = tctx->base;
551
552 memcpy(ctx->buffer, bctx->ipad, SHA1_MD5_BLOCK_SIZE);
553 ctx->bufcnt = SHA1_MD5_BLOCK_SIZE;
554 ctx->flags |= BIT(FLAGS_HMAC);
555 }
556
557 return 0;
558
559 }
560
561 static int omap_sham_update_req(struct omap_sham_dev *dd)
562 {
563 struct ahash_request *req = dd->req;
564 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
565 int err;
566
567 dev_dbg(dd->dev, "update_req: total: %u, digcnt: %d, finup: %d\n",
568 ctx->total, ctx->digcnt, (ctx->flags & BIT(FLAGS_FINUP)) != 0);
569
570 if (ctx->flags & BIT(FLAGS_CPU))
571 err = omap_sham_update_cpu(dd);
572 else
573 err = omap_sham_update_dma_start(dd);
574
575 /* wait for dma completion before can take more data */
576 dev_dbg(dd->dev, "update: err: %d, digcnt: %d\n", err, ctx->digcnt);
577
578 return err;
579 }
580
581 static int omap_sham_final_req(struct omap_sham_dev *dd)
582 {
583 struct ahash_request *req = dd->req;
584 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
585 int err = 0, use_dma = 1;
586
587 if (ctx->bufcnt <= 64)
588 /* faster to handle last block with cpu */
589 use_dma = 0;
590
591 if (use_dma)
592 err = omap_sham_xmit_dma_map(dd, ctx, ctx->bufcnt, 1);
593 else
594 err = omap_sham_xmit_cpu(dd, ctx->buffer, ctx->bufcnt, 1);
595
596 ctx->bufcnt = 0;
597
598 dev_dbg(dd->dev, "final_req: err: %d\n", err);
599
600 return err;
601 }
602
603 static int omap_sham_finish_hmac(struct ahash_request *req)
604 {
605 struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
606 struct omap_sham_hmac_ctx *bctx = tctx->base;
607 int bs = crypto_shash_blocksize(bctx->shash);
608 int ds = crypto_shash_digestsize(bctx->shash);
609 struct {
610 struct shash_desc shash;
611 char ctx[crypto_shash_descsize(bctx->shash)];
612 } desc;
613
614 desc.shash.tfm = bctx->shash;
615 desc.shash.flags = 0; /* not CRYPTO_TFM_REQ_MAY_SLEEP */
616
617 return crypto_shash_init(&desc.shash) ?:
618 crypto_shash_update(&desc.shash, bctx->opad, bs) ?:
619 crypto_shash_finup(&desc.shash, req->result, ds, req->result);
620 }
621
622 static int omap_sham_finish(struct ahash_request *req)
623 {
624 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
625 struct omap_sham_dev *dd = ctx->dd;
626 int err = 0;
627
628 if (ctx->digcnt) {
629 omap_sham_copy_ready_hash(req);
630 if (ctx->flags & BIT(FLAGS_HMAC))
631 err = omap_sham_finish_hmac(req);
632 }
633
634 dev_dbg(dd->dev, "digcnt: %d, bufcnt: %d\n", ctx->digcnt, ctx->bufcnt);
635
636 return err;
637 }
638
639 static void omap_sham_finish_req(struct ahash_request *req, int err)
640 {
641 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
642 struct omap_sham_dev *dd = ctx->dd;
643
644 if (!err) {
645 omap_sham_copy_hash(req, 1);
646 if (test_bit(FLAGS_FINAL, &dd->flags))
647 err = omap_sham_finish(req);
648 } else {
649 ctx->flags |= BIT(FLAGS_ERROR);
650 }
651
652 /* atomic operation is not needed here */
653 dd->flags &= ~(BIT(FLAGS_BUSY) | BIT(FLAGS_FINAL) | BIT(FLAGS_CPU) |
654 BIT(FLAGS_DMA_READY) | BIT(FLAGS_OUTPUT_READY));
655 clk_disable(dd->iclk);
656
657 if (req->base.complete)
658 req->base.complete(&req->base, err);
659
660 /* handle new request */
661 tasklet_schedule(&dd->done_task);
662 }
663
664 static int omap_sham_handle_queue(struct omap_sham_dev *dd,
665 struct ahash_request *req)
666 {
667 struct crypto_async_request *async_req, *backlog;
668 struct omap_sham_reqctx *ctx;
669 unsigned long flags;
670 int err = 0, ret = 0;
671
672 spin_lock_irqsave(&dd->lock, flags);
673 if (req)
674 ret = ahash_enqueue_request(&dd->queue, req);
675 if (test_bit(FLAGS_BUSY, &dd->flags)) {
676 spin_unlock_irqrestore(&dd->lock, flags);
677 return ret;
678 }
679 backlog = crypto_get_backlog(&dd->queue);
680 async_req = crypto_dequeue_request(&dd->queue);
681 if (async_req)
682 set_bit(FLAGS_BUSY, &dd->flags);
683 spin_unlock_irqrestore(&dd->lock, flags);
684
685 if (!async_req)
686 return ret;
687
688 if (backlog)
689 backlog->complete(backlog, -EINPROGRESS);
690
691 req = ahash_request_cast(async_req);
692 dd->req = req;
693 ctx = ahash_request_ctx(req);
694
695 dev_dbg(dd->dev, "handling new req, op: %lu, nbytes: %d\n",
696 ctx->op, req->nbytes);
697
698 err = omap_sham_hw_init(dd);
699 if (err)
700 goto err1;
701
702 omap_set_dma_dest_params(dd->dma_lch, 0,
703 OMAP_DMA_AMODE_CONSTANT,
704 dd->phys_base + SHA_REG_DIN(0), 0, 16);
705
706 omap_set_dma_dest_burst_mode(dd->dma_lch,
707 OMAP_DMA_DATA_BURST_16);
708
709 omap_set_dma_src_burst_mode(dd->dma_lch,
710 OMAP_DMA_DATA_BURST_4);
711
712 if (ctx->digcnt)
713 /* request has changed - restore hash */
714 omap_sham_copy_hash(req, 0);
715
716 if (ctx->op == OP_UPDATE) {
717 err = omap_sham_update_req(dd);
718 if (err != -EINPROGRESS && (ctx->flags & BIT(FLAGS_FINUP)))
719 /* no final() after finup() */
720 err = omap_sham_final_req(dd);
721 } else if (ctx->op == OP_FINAL) {
722 err = omap_sham_final_req(dd);
723 }
724 err1:
725 if (err != -EINPROGRESS)
726 /* done_task will not finish it, so do it here */
727 omap_sham_finish_req(req, err);
728
729 dev_dbg(dd->dev, "exit, err: %d\n", err);
730
731 return ret;
732 }
733
734 static int omap_sham_enqueue(struct ahash_request *req, unsigned int op)
735 {
736 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
737 struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
738 struct omap_sham_dev *dd = tctx->dd;
739
740 ctx->op = op;
741
742 return omap_sham_handle_queue(dd, req);
743 }
744
745 static int omap_sham_update(struct ahash_request *req)
746 {
747 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
748
749 if (!req->nbytes)
750 return 0;
751
752 ctx->total = req->nbytes;
753 ctx->sg = req->src;
754 ctx->offset = 0;
755
756 if (ctx->flags & BIT(FLAGS_FINUP)) {
757 if ((ctx->digcnt + ctx->bufcnt + ctx->total) < 9) {
758 /*
759 * OMAP HW accel works only with buffers >= 9
760 * will switch to bypass in final()
761 * final has the same request and data
762 */
763 omap_sham_append_sg(ctx);
764 return 0;
765 } else if (ctx->bufcnt + ctx->total <= SHA1_MD5_BLOCK_SIZE) {
766 /*
767 * faster to use CPU for short transfers
768 */
769 ctx->flags |= BIT(FLAGS_CPU);
770 }
771 } else if (ctx->bufcnt + ctx->total < ctx->buflen) {
772 omap_sham_append_sg(ctx);
773 return 0;
774 }
775
776 return omap_sham_enqueue(req, OP_UPDATE);
777 }
778
779 static int omap_sham_shash_digest(struct crypto_shash *shash, u32 flags,
780 const u8 *data, unsigned int len, u8 *out)
781 {
782 struct {
783 struct shash_desc shash;
784 char ctx[crypto_shash_descsize(shash)];
785 } desc;
786
787 desc.shash.tfm = shash;
788 desc.shash.flags = flags & CRYPTO_TFM_REQ_MAY_SLEEP;
789
790 return crypto_shash_digest(&desc.shash, data, len, out);
791 }
792
793 static int omap_sham_final_shash(struct ahash_request *req)
794 {
795 struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
796 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
797
798 return omap_sham_shash_digest(tctx->fallback, req->base.flags,
799 ctx->buffer, ctx->bufcnt, req->result);
800 }
801
802 static int omap_sham_final(struct ahash_request *req)
803 {
804 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
805
806 ctx->flags |= BIT(FLAGS_FINUP);
807
808 if (ctx->flags & BIT(FLAGS_ERROR))
809 return 0; /* uncompleted hash is not needed */
810
811 /* OMAP HW accel works only with buffers >= 9 */
812 /* HMAC is always >= 9 because ipad == block size */
813 if ((ctx->digcnt + ctx->bufcnt) < 9)
814 return omap_sham_final_shash(req);
815 else if (ctx->bufcnt)
816 return omap_sham_enqueue(req, OP_FINAL);
817
818 /* copy ready hash (+ finalize hmac) */
819 return omap_sham_finish(req);
820 }
821
822 static int omap_sham_finup(struct ahash_request *req)
823 {
824 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
825 int err1, err2;
826
827 ctx->flags |= BIT(FLAGS_FINUP);
828
829 err1 = omap_sham_update(req);
830 if (err1 == -EINPROGRESS || err1 == -EBUSY)
831 return err1;
832 /*
833 * final() has to be always called to cleanup resources
834 * even if udpate() failed, except EINPROGRESS
835 */
836 err2 = omap_sham_final(req);
837
838 return err1 ?: err2;
839 }
840
841 static int omap_sham_digest(struct ahash_request *req)
842 {
843 return omap_sham_init(req) ?: omap_sham_finup(req);
844 }
845
846 static int omap_sham_setkey(struct crypto_ahash *tfm, const u8 *key,
847 unsigned int keylen)
848 {
849 struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
850 struct omap_sham_hmac_ctx *bctx = tctx->base;
851 int bs = crypto_shash_blocksize(bctx->shash);
852 int ds = crypto_shash_digestsize(bctx->shash);
853 int err, i;
854 err = crypto_shash_setkey(tctx->fallback, key, keylen);
855 if (err)
856 return err;
857
858 if (keylen > bs) {
859 err = omap_sham_shash_digest(bctx->shash,
860 crypto_shash_get_flags(bctx->shash),
861 key, keylen, bctx->ipad);
862 if (err)
863 return err;
864 keylen = ds;
865 } else {
866 memcpy(bctx->ipad, key, keylen);
867 }
868
869 memset(bctx->ipad + keylen, 0, bs - keylen);
870 memcpy(bctx->opad, bctx->ipad, bs);
871
872 for (i = 0; i < bs; i++) {
873 bctx->ipad[i] ^= 0x36;
874 bctx->opad[i] ^= 0x5c;
875 }
876
877 return err;
878 }
879
880 static int omap_sham_cra_init_alg(struct crypto_tfm *tfm, const char *alg_base)
881 {
882 struct omap_sham_ctx *tctx = crypto_tfm_ctx(tfm);
883 const char *alg_name = crypto_tfm_alg_name(tfm);
884
885 /* Allocate a fallback and abort if it failed. */
886 tctx->fallback = crypto_alloc_shash(alg_name, 0,
887 CRYPTO_ALG_NEED_FALLBACK);
888 if (IS_ERR(tctx->fallback)) {
889 pr_err("omap-sham: fallback driver '%s' "
890 "could not be loaded.\n", alg_name);
891 return PTR_ERR(tctx->fallback);
892 }
893
894 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
895 sizeof(struct omap_sham_reqctx) + BUFLEN);
896
897 if (alg_base) {
898 struct omap_sham_hmac_ctx *bctx = tctx->base;
899 tctx->flags |= BIT(FLAGS_HMAC);
900 bctx->shash = crypto_alloc_shash(alg_base, 0,
901 CRYPTO_ALG_NEED_FALLBACK);
902 if (IS_ERR(bctx->shash)) {
903 pr_err("omap-sham: base driver '%s' "
904 "could not be loaded.\n", alg_base);
905 crypto_free_shash(tctx->fallback);
906 return PTR_ERR(bctx->shash);
907 }
908
909 }
910
911 return 0;
912 }
913
914 static int omap_sham_cra_init(struct crypto_tfm *tfm)
915 {
916 return omap_sham_cra_init_alg(tfm, NULL);
917 }
918
919 static int omap_sham_cra_sha1_init(struct crypto_tfm *tfm)
920 {
921 return omap_sham_cra_init_alg(tfm, "sha1");
922 }
923
924 static int omap_sham_cra_md5_init(struct crypto_tfm *tfm)
925 {
926 return omap_sham_cra_init_alg(tfm, "md5");
927 }
928
929 static void omap_sham_cra_exit(struct crypto_tfm *tfm)
930 {
931 struct omap_sham_ctx *tctx = crypto_tfm_ctx(tfm);
932
933 crypto_free_shash(tctx->fallback);
934 tctx->fallback = NULL;
935
936 if (tctx->flags & BIT(FLAGS_HMAC)) {
937 struct omap_sham_hmac_ctx *bctx = tctx->base;
938 crypto_free_shash(bctx->shash);
939 }
940 }
941
942 static struct ahash_alg algs[] = {
943 {
944 .init = omap_sham_init,
945 .update = omap_sham_update,
946 .final = omap_sham_final,
947 .finup = omap_sham_finup,
948 .digest = omap_sham_digest,
949 .halg.digestsize = SHA1_DIGEST_SIZE,
950 .halg.base = {
951 .cra_name = "sha1",
952 .cra_driver_name = "omap-sha1",
953 .cra_priority = 100,
954 .cra_flags = CRYPTO_ALG_TYPE_AHASH |
955 CRYPTO_ALG_KERN_DRIVER_ONLY |
956 CRYPTO_ALG_ASYNC |
957 CRYPTO_ALG_NEED_FALLBACK,
958 .cra_blocksize = SHA1_BLOCK_SIZE,
959 .cra_ctxsize = sizeof(struct omap_sham_ctx),
960 .cra_alignmask = 0,
961 .cra_module = THIS_MODULE,
962 .cra_init = omap_sham_cra_init,
963 .cra_exit = omap_sham_cra_exit,
964 }
965 },
966 {
967 .init = omap_sham_init,
968 .update = omap_sham_update,
969 .final = omap_sham_final,
970 .finup = omap_sham_finup,
971 .digest = omap_sham_digest,
972 .halg.digestsize = MD5_DIGEST_SIZE,
973 .halg.base = {
974 .cra_name = "md5",
975 .cra_driver_name = "omap-md5",
976 .cra_priority = 100,
977 .cra_flags = CRYPTO_ALG_TYPE_AHASH |
978 CRYPTO_ALG_KERN_DRIVER_ONLY |
979 CRYPTO_ALG_ASYNC |
980 CRYPTO_ALG_NEED_FALLBACK,
981 .cra_blocksize = SHA1_BLOCK_SIZE,
982 .cra_ctxsize = sizeof(struct omap_sham_ctx),
983 .cra_alignmask = OMAP_ALIGN_MASK,
984 .cra_module = THIS_MODULE,
985 .cra_init = omap_sham_cra_init,
986 .cra_exit = omap_sham_cra_exit,
987 }
988 },
989 {
990 .init = omap_sham_init,
991 .update = omap_sham_update,
992 .final = omap_sham_final,
993 .finup = omap_sham_finup,
994 .digest = omap_sham_digest,
995 .setkey = omap_sham_setkey,
996 .halg.digestsize = SHA1_DIGEST_SIZE,
997 .halg.base = {
998 .cra_name = "hmac(sha1)",
999 .cra_driver_name = "omap-hmac-sha1",
1000 .cra_priority = 100,
1001 .cra_flags = CRYPTO_ALG_TYPE_AHASH |
1002 CRYPTO_ALG_KERN_DRIVER_ONLY |
1003 CRYPTO_ALG_ASYNC |
1004 CRYPTO_ALG_NEED_FALLBACK,
1005 .cra_blocksize = SHA1_BLOCK_SIZE,
1006 .cra_ctxsize = sizeof(struct omap_sham_ctx) +
1007 sizeof(struct omap_sham_hmac_ctx),
1008 .cra_alignmask = OMAP_ALIGN_MASK,
1009 .cra_module = THIS_MODULE,
1010 .cra_init = omap_sham_cra_sha1_init,
1011 .cra_exit = omap_sham_cra_exit,
1012 }
1013 },
1014 {
1015 .init = omap_sham_init,
1016 .update = omap_sham_update,
1017 .final = omap_sham_final,
1018 .finup = omap_sham_finup,
1019 .digest = omap_sham_digest,
1020 .setkey = omap_sham_setkey,
1021 .halg.digestsize = MD5_DIGEST_SIZE,
1022 .halg.base = {
1023 .cra_name = "hmac(md5)",
1024 .cra_driver_name = "omap-hmac-md5",
1025 .cra_priority = 100,
1026 .cra_flags = CRYPTO_ALG_TYPE_AHASH |
1027 CRYPTO_ALG_KERN_DRIVER_ONLY |
1028 CRYPTO_ALG_ASYNC |
1029 CRYPTO_ALG_NEED_FALLBACK,
1030 .cra_blocksize = SHA1_BLOCK_SIZE,
1031 .cra_ctxsize = sizeof(struct omap_sham_ctx) +
1032 sizeof(struct omap_sham_hmac_ctx),
1033 .cra_alignmask = OMAP_ALIGN_MASK,
1034 .cra_module = THIS_MODULE,
1035 .cra_init = omap_sham_cra_md5_init,
1036 .cra_exit = omap_sham_cra_exit,
1037 }
1038 }
1039 };
1040
1041 static void omap_sham_done_task(unsigned long data)
1042 {
1043 struct omap_sham_dev *dd = (struct omap_sham_dev *)data;
1044 int err = 0;
1045
1046 if (!test_bit(FLAGS_BUSY, &dd->flags)) {
1047 omap_sham_handle_queue(dd, NULL);
1048 return;
1049 }
1050
1051 if (test_bit(FLAGS_CPU, &dd->flags)) {
1052 if (test_and_clear_bit(FLAGS_OUTPUT_READY, &dd->flags))
1053 goto finish;
1054 } else if (test_bit(FLAGS_DMA_READY, &dd->flags)) {
1055 if (test_and_clear_bit(FLAGS_DMA_ACTIVE, &dd->flags)) {
1056 omap_sham_update_dma_stop(dd);
1057 if (dd->err) {
1058 err = dd->err;
1059 goto finish;
1060 }
1061 }
1062 if (test_and_clear_bit(FLAGS_OUTPUT_READY, &dd->flags)) {
1063 /* hash or semi-hash ready */
1064 clear_bit(FLAGS_DMA_READY, &dd->flags);
1065 err = omap_sham_update_dma_start(dd);
1066 if (err != -EINPROGRESS)
1067 goto finish;
1068 }
1069 }
1070
1071 return;
1072
1073 finish:
1074 dev_dbg(dd->dev, "update done: err: %d\n", err);
1075 /* finish curent request */
1076 omap_sham_finish_req(dd->req, err);
1077 }
1078
1079 static irqreturn_t omap_sham_irq(int irq, void *dev_id)
1080 {
1081 struct omap_sham_dev *dd = dev_id;
1082
1083 if (unlikely(test_bit(FLAGS_FINAL, &dd->flags)))
1084 /* final -> allow device to go to power-saving mode */
1085 omap_sham_write_mask(dd, SHA_REG_CTRL, 0, SHA_REG_CTRL_LENGTH);
1086
1087 omap_sham_write_mask(dd, SHA_REG_CTRL, SHA_REG_CTRL_OUTPUT_READY,
1088 SHA_REG_CTRL_OUTPUT_READY);
1089 omap_sham_read(dd, SHA_REG_CTRL);
1090
1091 if (!test_bit(FLAGS_BUSY, &dd->flags)) {
1092 dev_warn(dd->dev, "Interrupt when no active requests.\n");
1093 return IRQ_HANDLED;
1094 }
1095
1096 set_bit(FLAGS_OUTPUT_READY, &dd->flags);
1097 tasklet_schedule(&dd->done_task);
1098
1099 return IRQ_HANDLED;
1100 }
1101
1102 static void omap_sham_dma_callback(int lch, u16 ch_status, void *data)
1103 {
1104 struct omap_sham_dev *dd = data;
1105
1106 if (ch_status != OMAP_DMA_BLOCK_IRQ) {
1107 pr_err("omap-sham DMA error status: 0x%hx\n", ch_status);
1108 dd->err = -EIO;
1109 clear_bit(FLAGS_INIT, &dd->flags);/* request to re-initialize */
1110 }
1111
1112 set_bit(FLAGS_DMA_READY, &dd->flags);
1113 tasklet_schedule(&dd->done_task);
1114 }
1115
1116 static int omap_sham_dma_init(struct omap_sham_dev *dd)
1117 {
1118 int err;
1119
1120 dd->dma_lch = -1;
1121
1122 err = omap_request_dma(dd->dma, dev_name(dd->dev),
1123 omap_sham_dma_callback, dd, &dd->dma_lch);
1124 if (err) {
1125 dev_err(dd->dev, "Unable to request DMA channel\n");
1126 return err;
1127 }
1128
1129 return 0;
1130 }
1131
1132 static void omap_sham_dma_cleanup(struct omap_sham_dev *dd)
1133 {
1134 if (dd->dma_lch >= 0) {
1135 omap_free_dma(dd->dma_lch);
1136 dd->dma_lch = -1;
1137 }
1138 }
1139
1140 static int omap_sham_probe(struct platform_device *pdev)
1141 {
1142 struct omap_sham_dev *dd;
1143 struct device *dev = &pdev->dev;
1144 struct resource *res;
1145 int err, i, j;
1146
1147 dd = kzalloc(sizeof(struct omap_sham_dev), GFP_KERNEL);
1148 if (dd == NULL) {
1149 dev_err(dev, "unable to alloc data struct.\n");
1150 err = -ENOMEM;
1151 goto data_err;
1152 }
1153 dd->dev = dev;
1154 platform_set_drvdata(pdev, dd);
1155
1156 INIT_LIST_HEAD(&dd->list);
1157 spin_lock_init(&dd->lock);
1158 tasklet_init(&dd->done_task, omap_sham_done_task, (unsigned long)dd);
1159 crypto_init_queue(&dd->queue, OMAP_SHAM_QUEUE_LENGTH);
1160
1161 dd->irq = -1;
1162
1163 /* Get the base address */
1164 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1165 if (!res) {
1166 dev_err(dev, "no MEM resource info\n");
1167 err = -ENODEV;
1168 goto res_err;
1169 }
1170 dd->phys_base = res->start;
1171
1172 /* Get the DMA */
1173 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1174 if (!res) {
1175 dev_err(dev, "no DMA resource info\n");
1176 err = -ENODEV;
1177 goto res_err;
1178 }
1179 dd->dma = res->start;
1180
1181 /* Get the IRQ */
1182 dd->irq = platform_get_irq(pdev, 0);
1183 if (dd->irq < 0) {
1184 dev_err(dev, "no IRQ resource info\n");
1185 err = dd->irq;
1186 goto res_err;
1187 }
1188
1189 err = request_irq(dd->irq, omap_sham_irq,
1190 IRQF_TRIGGER_LOW, dev_name(dev), dd);
1191 if (err) {
1192 dev_err(dev, "unable to request irq.\n");
1193 goto res_err;
1194 }
1195
1196 err = omap_sham_dma_init(dd);
1197 if (err)
1198 goto dma_err;
1199
1200 /* Initializing the clock */
1201 dd->iclk = clk_get(dev, "ick");
1202 if (IS_ERR(dd->iclk)) {
1203 dev_err(dev, "clock intialization failed.\n");
1204 err = PTR_ERR(dd->iclk);
1205 goto clk_err;
1206 }
1207
1208 dd->io_base = ioremap(dd->phys_base, SZ_4K);
1209 if (!dd->io_base) {
1210 dev_err(dev, "can't ioremap\n");
1211 err = -ENOMEM;
1212 goto io_err;
1213 }
1214
1215 clk_enable(dd->iclk);
1216 dev_info(dev, "hw accel on OMAP rev %u.%u\n",
1217 (omap_sham_read(dd, SHA_REG_REV) & SHA_REG_REV_MAJOR) >> 4,
1218 omap_sham_read(dd, SHA_REG_REV) & SHA_REG_REV_MINOR);
1219 clk_disable(dd->iclk);
1220
1221 spin_lock(&sham.lock);
1222 list_add_tail(&dd->list, &sham.dev_list);
1223 spin_unlock(&sham.lock);
1224
1225 for (i = 0; i < ARRAY_SIZE(algs); i++) {
1226 err = crypto_register_ahash(&algs[i]);
1227 if (err)
1228 goto err_algs;
1229 }
1230
1231 return 0;
1232
1233 err_algs:
1234 for (j = 0; j < i; j++)
1235 crypto_unregister_ahash(&algs[j]);
1236 iounmap(dd->io_base);
1237 io_err:
1238 clk_put(dd->iclk);
1239 clk_err:
1240 omap_sham_dma_cleanup(dd);
1241 dma_err:
1242 if (dd->irq >= 0)
1243 free_irq(dd->irq, dd);
1244 res_err:
1245 kfree(dd);
1246 dd = NULL;
1247 data_err:
1248 dev_err(dev, "initialization failed.\n");
1249
1250 return err;
1251 }
1252
1253 static int omap_sham_remove(struct platform_device *pdev)
1254 {
1255 static struct omap_sham_dev *dd;
1256 int i;
1257
1258 dd = platform_get_drvdata(pdev);
1259 if (!dd)
1260 return -ENODEV;
1261 spin_lock(&sham.lock);
1262 list_del(&dd->list);
1263 spin_unlock(&sham.lock);
1264 for (i = 0; i < ARRAY_SIZE(algs); i++)
1265 crypto_unregister_ahash(&algs[i]);
1266 tasklet_kill(&dd->done_task);
1267 iounmap(dd->io_base);
1268 clk_put(dd->iclk);
1269 omap_sham_dma_cleanup(dd);
1270 if (dd->irq >= 0)
1271 free_irq(dd->irq, dd);
1272 kfree(dd);
1273 dd = NULL;
1274
1275 return 0;
1276 }
1277
1278 static struct platform_driver omap_sham_driver = {
1279 .probe = omap_sham_probe,
1280 .remove = omap_sham_remove,
1281 .driver = {
1282 .name = "omap-sham",
1283 .owner = THIS_MODULE,
1284 },
1285 };
1286
1287 static int __init omap_sham_mod_init(void)
1288 {
1289 pr_info("loading %s driver\n", "omap-sham");
1290
1291 return platform_driver_register(&omap_sham_driver);
1292 }
1293
1294 static void __exit omap_sham_mod_exit(void)
1295 {
1296 platform_driver_unregister(&omap_sham_driver);
1297 }
1298
1299 module_init(omap_sham_mod_init);
1300 module_exit(omap_sham_mod_exit);
1301
1302 MODULE_DESCRIPTION("OMAP SHA1/MD5 hw acceleration support.");
1303 MODULE_LICENSE("GPL v2");
1304 MODULE_AUTHOR("Dmitry Kasatkin");
Linux with added FPC-III support