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dm table: reject devices without request fns
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / crypto / omap-sham.c
blob2e71123516e09f2d02667ddc11024196c8275da3
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 <plat/cpu.h>
41 #include <plat/dma.h>
42 #include <mach/irqs.h>
43
44 #define SHA_REG_DIGEST(x) (0x00 + ((x) * 0x04))
45 #define SHA_REG_DIN(x) (0x1C + ((x) * 0x04))
46
47 #define SHA1_MD5_BLOCK_SIZE SHA1_BLOCK_SIZE
48 #define MD5_DIGEST_SIZE 16
49
50 #define SHA_REG_DIGCNT 0x14
51
52 #define SHA_REG_CTRL 0x18
53 #define SHA_REG_CTRL_LENGTH (0xFFFFFFFF << 5)
54 #define SHA_REG_CTRL_CLOSE_HASH (1 << 4)
55 #define SHA_REG_CTRL_ALGO_CONST (1 << 3)
56 #define SHA_REG_CTRL_ALGO (1 << 2)
57 #define SHA_REG_CTRL_INPUT_READY (1 << 1)
58 #define SHA_REG_CTRL_OUTPUT_READY (1 << 0)
59
60 #define SHA_REG_REV 0x5C
61 #define SHA_REG_REV_MAJOR 0xF0
62 #define SHA_REG_REV_MINOR 0x0F
63
64 #define SHA_REG_MASK 0x60
65 #define SHA_REG_MASK_DMA_EN (1 << 3)
66 #define SHA_REG_MASK_IT_EN (1 << 2)
67 #define SHA_REG_MASK_SOFTRESET (1 << 1)
68 #define SHA_REG_AUTOIDLE (1 << 0)
69
70 #define SHA_REG_SYSSTATUS 0x64
71 #define SHA_REG_SYSSTATUS_RESETDONE (1 << 0)
72
73 #define DEFAULT_TIMEOUT_INTERVAL HZ
74
75 #define FLAGS_FINUP 0x0002
76 #define FLAGS_FINAL 0x0004
77 #define FLAGS_SG 0x0008
78 #define FLAGS_SHA1 0x0010
79 #define FLAGS_DMA_ACTIVE 0x0020
80 #define FLAGS_OUTPUT_READY 0x0040
81 #define FLAGS_CLEAN 0x0080
82 #define FLAGS_INIT 0x0100
83 #define FLAGS_CPU 0x0200
84 #define FLAGS_HMAC 0x0400
85 #define FLAGS_ERROR 0x0800
86 #define FLAGS_BUSY 0x1000
87
88 #define OP_UPDATE 1
89 #define OP_FINAL 2
90
91 #define OMAP_ALIGN_MASK (sizeof(u32)-1)
92 #define OMAP_ALIGNED __attribute__((aligned(sizeof(u32))))
93
94 #define BUFLEN PAGE_SIZE
95
96 struct omap_sham_dev;
97
98 struct omap_sham_reqctx {
99 struct omap_sham_dev *dd;
100 unsigned long flags;
101 unsigned long op;
102
103 u8 digest[SHA1_DIGEST_SIZE] OMAP_ALIGNED;
104 size_t digcnt;
105 size_t bufcnt;
106 size_t buflen;
107 dma_addr_t dma_addr;
108
109 /* walk state */
110 struct scatterlist *sg;
111 unsigned int offset; /* offset in current sg */
112 unsigned int total; /* total request */
113
114 u8 buffer[0] OMAP_ALIGNED;
115 };
116
117 struct omap_sham_hmac_ctx {
118 struct crypto_shash *shash;
119 u8 ipad[SHA1_MD5_BLOCK_SIZE];
120 u8 opad[SHA1_MD5_BLOCK_SIZE];
121 };
122
123 struct omap_sham_ctx {
124 struct omap_sham_dev *dd;
125
126 unsigned long flags;
127
128 /* fallback stuff */
129 struct crypto_shash *fallback;
130
131 struct omap_sham_hmac_ctx base[0];
132 };
133
134 #define OMAP_SHAM_QUEUE_LENGTH 1
135
136 struct omap_sham_dev {
137 struct list_head list;
138 unsigned long phys_base;
139 struct device *dev;
140 void __iomem *io_base;
141 int irq;
142 struct clk *iclk;
143 spinlock_t lock;
144 int err;
145 int dma;
146 int dma_lch;
147 struct tasklet_struct done_task;
148 struct tasklet_struct queue_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 & 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 (!(dd->flags & FLAGS_INIT)) {
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 dd->flags |= FLAGS_INIT;
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 & 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 ctx->flags |= FLAGS_FINAL; /* catch last interrupt */
306
307 len32 = DIV_ROUND_UP(length, sizeof(u32));
308
309 for (count = 0; count < len32; count++)
310 omap_sham_write(dd, SHA_REG_DIN(count), buffer[count]);
311
312 return -EINPROGRESS;
313 }
314
315 static int omap_sham_xmit_dma(struct omap_sham_dev *dd, dma_addr_t dma_addr,
316 size_t length, int final)
317 {
318 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
319 int len32;
320
321 dev_dbg(dd->dev, "xmit_dma: digcnt: %d, length: %d, final: %d\n",
322 ctx->digcnt, length, final);
323
324 len32 = DIV_ROUND_UP(length, sizeof(u32));
325
326 omap_set_dma_transfer_params(dd->dma_lch, OMAP_DMA_DATA_TYPE_S32, len32,
327 1, OMAP_DMA_SYNC_PACKET, dd->dma,
328 OMAP_DMA_DST_SYNC_PREFETCH);
329
330 omap_set_dma_src_params(dd->dma_lch, 0, OMAP_DMA_AMODE_POST_INC,
331 dma_addr, 0, 0);
332
333 omap_sham_write_ctrl(dd, length, final, 1);
334
335 ctx->digcnt += length;
336
337 if (final)
338 ctx->flags |= FLAGS_FINAL; /* catch last interrupt */
339
340 dd->flags |= FLAGS_DMA_ACTIVE;
341
342 omap_start_dma(dd->dma_lch);
343
344 return -EINPROGRESS;
345 }
346
347 static size_t omap_sham_append_buffer(struct omap_sham_reqctx *ctx,
348 const u8 *data, size_t length)
349 {
350 size_t count = min(length, ctx->buflen - ctx->bufcnt);
351
352 count = min(count, ctx->total);
353 if (count <= 0)
354 return 0;
355 memcpy(ctx->buffer + ctx->bufcnt, data, count);
356 ctx->bufcnt += count;
357
358 return count;
359 }
360
361 static size_t omap_sham_append_sg(struct omap_sham_reqctx *ctx)
362 {
363 size_t count;
364
365 while (ctx->sg) {
366 count = omap_sham_append_buffer(ctx,
367 sg_virt(ctx->sg) + ctx->offset,
368 ctx->sg->length - ctx->offset);
369 if (!count)
370 break;
371 ctx->offset += count;
372 ctx->total -= count;
373 if (ctx->offset == ctx->sg->length) {
374 ctx->sg = sg_next(ctx->sg);
375 if (ctx->sg)
376 ctx->offset = 0;
377 else
378 ctx->total = 0;
379 }
380 }
381
382 return 0;
383 }
384
385 static int omap_sham_xmit_dma_map(struct omap_sham_dev *dd,
386 struct omap_sham_reqctx *ctx,
387 size_t length, int final)
388 {
389 ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer, ctx->buflen,
390 DMA_TO_DEVICE);
391 if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
392 dev_err(dd->dev, "dma %u bytes error\n", ctx->buflen);
393 return -EINVAL;
394 }
395
396 ctx->flags &= ~FLAGS_SG;
397
398 /* next call does not fail... so no unmap in the case of error */
399 return omap_sham_xmit_dma(dd, ctx->dma_addr, length, final);
400 }
401
402 static int omap_sham_update_dma_slow(struct omap_sham_dev *dd)
403 {
404 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
405 unsigned int final;
406 size_t count;
407
408 omap_sham_append_sg(ctx);
409
410 final = (ctx->flags & FLAGS_FINUP) && !ctx->total;
411
412 dev_dbg(dd->dev, "slow: bufcnt: %u, digcnt: %d, final: %d\n",
413 ctx->bufcnt, ctx->digcnt, final);
414
415 if (final || (ctx->bufcnt == ctx->buflen && ctx->total)) {
416 count = ctx->bufcnt;
417 ctx->bufcnt = 0;
418 return omap_sham_xmit_dma_map(dd, ctx, count, final);
419 }
420
421 return 0;
422 }
423
424 /* Start address alignment */
425 #define SG_AA(sg) (IS_ALIGNED(sg->offset, sizeof(u32)))
426 /* SHA1 block size alignment */
427 #define SG_SA(sg) (IS_ALIGNED(sg->length, SHA1_MD5_BLOCK_SIZE))
428
429 static int omap_sham_update_dma_start(struct omap_sham_dev *dd)
430 {
431 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
432 unsigned int length, final, tail;
433 struct scatterlist *sg;
434
435 if (!ctx->total)
436 return 0;
437
438 if (ctx->bufcnt || ctx->offset)
439 return omap_sham_update_dma_slow(dd);
440
441 dev_dbg(dd->dev, "fast: digcnt: %d, bufcnt: %u, total: %u\n",
442 ctx->digcnt, ctx->bufcnt, ctx->total);
443
444 sg = ctx->sg;
445
446 if (!SG_AA(sg))
447 return omap_sham_update_dma_slow(dd);
448
449 if (!sg_is_last(sg) && !SG_SA(sg))
450 /* size is not SHA1_BLOCK_SIZE aligned */
451 return omap_sham_update_dma_slow(dd);
452
453 length = min(ctx->total, sg->length);
454
455 if (sg_is_last(sg)) {
456 if (!(ctx->flags & FLAGS_FINUP)) {
457 /* not last sg must be SHA1_MD5_BLOCK_SIZE aligned */
458 tail = length & (SHA1_MD5_BLOCK_SIZE - 1);
459 /* without finup() we need one block to close hash */
460 if (!tail)
461 tail = SHA1_MD5_BLOCK_SIZE;
462 length -= tail;
463 }
464 }
465
466 if (!dma_map_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE)) {
467 dev_err(dd->dev, "dma_map_sg error\n");
468 return -EINVAL;
469 }
470
471 ctx->flags |= FLAGS_SG;
472
473 ctx->total -= length;
474 ctx->offset = length; /* offset where to start slow */
475
476 final = (ctx->flags & FLAGS_FINUP) && !ctx->total;
477
478 /* next call does not fail... so no unmap in the case of error */
479 return omap_sham_xmit_dma(dd, sg_dma_address(ctx->sg), length, final);
480 }
481
482 static int omap_sham_update_cpu(struct omap_sham_dev *dd)
483 {
484 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
485 int bufcnt;
486
487 omap_sham_append_sg(ctx);
488 bufcnt = ctx->bufcnt;
489 ctx->bufcnt = 0;
490
491 return omap_sham_xmit_cpu(dd, ctx->buffer, bufcnt, 1);
492 }
493
494 static int omap_sham_update_dma_stop(struct omap_sham_dev *dd)
495 {
496 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
497
498 omap_stop_dma(dd->dma_lch);
499 if (ctx->flags & FLAGS_SG) {
500 dma_unmap_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE);
501 if (ctx->sg->length == ctx->offset) {
502 ctx->sg = sg_next(ctx->sg);
503 if (ctx->sg)
504 ctx->offset = 0;
505 }
506 } else {
507 dma_unmap_single(dd->dev, ctx->dma_addr, ctx->buflen,
508 DMA_TO_DEVICE);
509 }
510
511 return 0;
512 }
513
514 static void omap_sham_cleanup(struct ahash_request *req)
515 {
516 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
517 struct omap_sham_dev *dd = ctx->dd;
518 unsigned long flags;
519
520 spin_lock_irqsave(&dd->lock, flags);
521 if (ctx->flags & FLAGS_CLEAN) {
522 spin_unlock_irqrestore(&dd->lock, flags);
523 return;
524 }
525 ctx->flags |= FLAGS_CLEAN;
526 spin_unlock_irqrestore(&dd->lock, flags);
527
528 if (ctx->digcnt)
529 omap_sham_copy_ready_hash(req);
530
531 dev_dbg(dd->dev, "digcnt: %d, bufcnt: %d\n", ctx->digcnt, ctx->bufcnt);
532 }
533
534 static int omap_sham_init(struct ahash_request *req)
535 {
536 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
537 struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
538 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
539 struct omap_sham_dev *dd = NULL, *tmp;
540
541 spin_lock_bh(&sham.lock);
542 if (!tctx->dd) {
543 list_for_each_entry(tmp, &sham.dev_list, list) {
544 dd = tmp;
545 break;
546 }
547 tctx->dd = dd;
548 } else {
549 dd = tctx->dd;
550 }
551 spin_unlock_bh(&sham.lock);
552
553 ctx->dd = dd;
554
555 ctx->flags = 0;
556
557 dev_dbg(dd->dev, "init: digest size: %d\n",
558 crypto_ahash_digestsize(tfm));
559
560 if (crypto_ahash_digestsize(tfm) == SHA1_DIGEST_SIZE)
561 ctx->flags |= FLAGS_SHA1;
562
563 ctx->bufcnt = 0;
564 ctx->digcnt = 0;
565 ctx->buflen = BUFLEN;
566
567 if (tctx->flags & FLAGS_HMAC) {
568 struct omap_sham_hmac_ctx *bctx = tctx->base;
569
570 memcpy(ctx->buffer, bctx->ipad, SHA1_MD5_BLOCK_SIZE);
571 ctx->bufcnt = SHA1_MD5_BLOCK_SIZE;
572 ctx->flags |= FLAGS_HMAC;
573 }
574
575 return 0;
576
577 }
578
579 static int omap_sham_update_req(struct omap_sham_dev *dd)
580 {
581 struct ahash_request *req = dd->req;
582 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
583 int err;
584
585 dev_dbg(dd->dev, "update_req: total: %u, digcnt: %d, finup: %d\n",
586 ctx->total, ctx->digcnt, (ctx->flags & FLAGS_FINUP) != 0);
587
588 if (ctx->flags & FLAGS_CPU)
589 err = omap_sham_update_cpu(dd);
590 else
591 err = omap_sham_update_dma_start(dd);
592
593 /* wait for dma completion before can take more data */
594 dev_dbg(dd->dev, "update: err: %d, digcnt: %d\n", err, ctx->digcnt);
595
596 return err;
597 }
598
599 static int omap_sham_final_req(struct omap_sham_dev *dd)
600 {
601 struct ahash_request *req = dd->req;
602 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
603 int err = 0, use_dma = 1;
604
605 if (ctx->bufcnt <= 64)
606 /* faster to handle last block with cpu */
607 use_dma = 0;
608
609 if (use_dma)
610 err = omap_sham_xmit_dma_map(dd, ctx, ctx->bufcnt, 1);
611 else
612 err = omap_sham_xmit_cpu(dd, ctx->buffer, ctx->bufcnt, 1);
613
614 ctx->bufcnt = 0;
615
616 dev_dbg(dd->dev, "final_req: err: %d\n", err);
617
618 return err;
619 }
620
621 static int omap_sham_finish_req_hmac(struct ahash_request *req)
622 {
623 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
624 struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
625 struct omap_sham_hmac_ctx *bctx = tctx->base;
626 int bs = crypto_shash_blocksize(bctx->shash);
627 int ds = crypto_shash_digestsize(bctx->shash);
628 struct {
629 struct shash_desc shash;
630 char ctx[crypto_shash_descsize(bctx->shash)];
631 } desc;
632
633 desc.shash.tfm = bctx->shash;
634 desc.shash.flags = 0; /* not CRYPTO_TFM_REQ_MAY_SLEEP */
635
636 return crypto_shash_init(&desc.shash) ?:
637 crypto_shash_update(&desc.shash, bctx->opad, bs) ?:
638 crypto_shash_finup(&desc.shash, ctx->digest, ds, ctx->digest);
639 }
640
641 static void omap_sham_finish_req(struct ahash_request *req, int err)
642 {
643 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
644 struct omap_sham_dev *dd = ctx->dd;
645
646 if (!err) {
647 omap_sham_copy_hash(ctx->dd->req, 1);
648 if (ctx->flags & FLAGS_HMAC)
649 err = omap_sham_finish_req_hmac(req);
650 } else {
651 ctx->flags |= FLAGS_ERROR;
652 }
653
654 if ((ctx->flags & FLAGS_FINAL) || err)
655 omap_sham_cleanup(req);
656
657 clk_disable(dd->iclk);
658 dd->flags &= ~FLAGS_BUSY;
659
660 if (req->base.complete)
661 req->base.complete(&req->base, err);
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 struct ahash_request *prev_req;
670 unsigned long flags;
671 int err = 0, ret = 0;
672
673 spin_lock_irqsave(&dd->lock, flags);
674 if (req)
675 ret = ahash_enqueue_request(&dd->queue, req);
676 if (dd->flags & FLAGS_BUSY) {
677 spin_unlock_irqrestore(&dd->lock, flags);
678 return ret;
679 }
680 backlog = crypto_get_backlog(&dd->queue);
681 async_req = crypto_dequeue_request(&dd->queue);
682 if (async_req)
683 dd->flags |= FLAGS_BUSY;
684 spin_unlock_irqrestore(&dd->lock, flags);
685
686 if (!async_req)
687 return ret;
688
689 if (backlog)
690 backlog->complete(backlog, -EINPROGRESS);
691
692 req = ahash_request_cast(async_req);
693
694 prev_req = dd->req;
695 dd->req = req;
696
697 ctx = ahash_request_ctx(req);
698
699 dev_dbg(dd->dev, "handling new req, op: %lu, nbytes: %d\n",
700 ctx->op, req->nbytes);
701
702
703 err = omap_sham_hw_init(dd);
704 if (err)
705 goto err1;
706
707 omap_set_dma_dest_params(dd->dma_lch, 0,
708 OMAP_DMA_AMODE_CONSTANT,
709 dd->phys_base + SHA_REG_DIN(0), 0, 16);
710
711 omap_set_dma_dest_burst_mode(dd->dma_lch,
712 OMAP_DMA_DATA_BURST_16);
713
714 omap_set_dma_src_burst_mode(dd->dma_lch,
715 OMAP_DMA_DATA_BURST_4);
716
717 if (ctx->digcnt)
718 /* request has changed - restore hash */
719 omap_sham_copy_hash(req, 0);
720
721 if (ctx->op == OP_UPDATE) {
722 err = omap_sham_update_req(dd);
723 if (err != -EINPROGRESS && (ctx->flags & FLAGS_FINUP))
724 /* no final() after finup() */
725 err = omap_sham_final_req(dd);
726 } else if (ctx->op == OP_FINAL) {
727 err = omap_sham_final_req(dd);
728 }
729 err1:
730 if (err != -EINPROGRESS) {
731 /* done_task will not finish it, so do it here */
732 omap_sham_finish_req(req, err);
733 tasklet_schedule(&dd->queue_task);
734 }
735
736 dev_dbg(dd->dev, "exit, err: %d\n", err);
737
738 return ret;
739 }
740
741 static int omap_sham_enqueue(struct ahash_request *req, unsigned int op)
742 {
743 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
744 struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
745 struct omap_sham_dev *dd = tctx->dd;
746
747 ctx->op = op;
748
749 return omap_sham_handle_queue(dd, req);
750 }
751
752 static int omap_sham_update(struct ahash_request *req)
753 {
754 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
755
756 if (!req->nbytes)
757 return 0;
758
759 ctx->total = req->nbytes;
760 ctx->sg = req->src;
761 ctx->offset = 0;
762
763 if (ctx->flags & FLAGS_FINUP) {
764 if ((ctx->digcnt + ctx->bufcnt + ctx->total) < 9) {
765 /*
766 * OMAP HW accel works only with buffers >= 9
767 * will switch to bypass in final()
768 * final has the same request and data
769 */
770 omap_sham_append_sg(ctx);
771 return 0;
772 } else if (ctx->bufcnt + ctx->total <= SHA1_MD5_BLOCK_SIZE) {
773 /*
774 * faster to use CPU for short transfers
775 */
776 ctx->flags |= FLAGS_CPU;
777 }
778 } else if (ctx->bufcnt + ctx->total < ctx->buflen) {
779 omap_sham_append_sg(ctx);
780 return 0;
781 }
782
783 return omap_sham_enqueue(req, OP_UPDATE);
784 }
785
786 static int omap_sham_shash_digest(struct crypto_shash *shash, u32 flags,
787 const u8 *data, unsigned int len, u8 *out)
788 {
789 struct {
790 struct shash_desc shash;
791 char ctx[crypto_shash_descsize(shash)];
792 } desc;
793
794 desc.shash.tfm = shash;
795 desc.shash.flags = flags & CRYPTO_TFM_REQ_MAY_SLEEP;
796
797 return crypto_shash_digest(&desc.shash, data, len, out);
798 }
799
800 static int omap_sham_final_shash(struct ahash_request *req)
801 {
802 struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
803 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
804
805 return omap_sham_shash_digest(tctx->fallback, req->base.flags,
806 ctx->buffer, ctx->bufcnt, req->result);
807 }
808
809 static int omap_sham_final(struct ahash_request *req)
810 {
811 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
812 int err = 0;
813
814 ctx->flags |= FLAGS_FINUP;
815
816 if (!(ctx->flags & FLAGS_ERROR)) {
817 /* OMAP HW accel works only with buffers >= 9 */
818 /* HMAC is always >= 9 because of ipad */
819 if ((ctx->digcnt + ctx->bufcnt) < 9)
820 err = omap_sham_final_shash(req);
821 else if (ctx->bufcnt)
822 return omap_sham_enqueue(req, OP_FINAL);
823 }
824
825 omap_sham_cleanup(req);
826
827 return err;
828 }
829
830 static int omap_sham_finup(struct ahash_request *req)
831 {
832 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
833 int err1, err2;
834
835 ctx->flags |= FLAGS_FINUP;
836
837 err1 = omap_sham_update(req);
838 if (err1 == -EINPROGRESS)
839 return err1;
840 /*
841 * final() has to be always called to cleanup resources
842 * even if udpate() failed, except EINPROGRESS
843 */
844 err2 = omap_sham_final(req);
845
846 return err1 ?: err2;
847 }
848
849 static int omap_sham_digest(struct ahash_request *req)
850 {
851 return omap_sham_init(req) ?: omap_sham_finup(req);
852 }
853
854 static int omap_sham_setkey(struct crypto_ahash *tfm, const u8 *key,
855 unsigned int keylen)
856 {
857 struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
858 struct omap_sham_hmac_ctx *bctx = tctx->base;
859 int bs = crypto_shash_blocksize(bctx->shash);
860 int ds = crypto_shash_digestsize(bctx->shash);
861 int err, i;
862 err = crypto_shash_setkey(tctx->fallback, key, keylen);
863 if (err)
864 return err;
865
866 if (keylen > bs) {
867 err = omap_sham_shash_digest(bctx->shash,
868 crypto_shash_get_flags(bctx->shash),
869 key, keylen, bctx->ipad);
870 if (err)
871 return err;
872 keylen = ds;
873 } else {
874 memcpy(bctx->ipad, key, keylen);
875 }
876
877 memset(bctx->ipad + keylen, 0, bs - keylen);
878 memcpy(bctx->opad, bctx->ipad, bs);
879
880 for (i = 0; i < bs; i++) {
881 bctx->ipad[i] ^= 0x36;
882 bctx->opad[i] ^= 0x5c;
883 }
884
885 return err;
886 }
887
888 static int omap_sham_cra_init_alg(struct crypto_tfm *tfm, const char *alg_base)
889 {
890 struct omap_sham_ctx *tctx = crypto_tfm_ctx(tfm);
891 const char *alg_name = crypto_tfm_alg_name(tfm);
892
893 pr_info("enter\n");
894
895 /* Allocate a fallback and abort if it failed. */
896 tctx->fallback = crypto_alloc_shash(alg_name, 0,
897 CRYPTO_ALG_NEED_FALLBACK);
898 if (IS_ERR(tctx->fallback)) {
899 pr_err("omap-sham: fallback driver '%s' "
900 "could not be loaded.\n", alg_name);
901 return PTR_ERR(tctx->fallback);
902 }
903
904 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
905 sizeof(struct omap_sham_reqctx) + BUFLEN);
906
907 if (alg_base) {
908 struct omap_sham_hmac_ctx *bctx = tctx->base;
909 tctx->flags |= FLAGS_HMAC;
910 bctx->shash = crypto_alloc_shash(alg_base, 0,
911 CRYPTO_ALG_NEED_FALLBACK);
912 if (IS_ERR(bctx->shash)) {
913 pr_err("omap-sham: base driver '%s' "
914 "could not be loaded.\n", alg_base);
915 crypto_free_shash(tctx->fallback);
916 return PTR_ERR(bctx->shash);
917 }
918
919 }
920
921 return 0;
922 }
923
924 static int omap_sham_cra_init(struct crypto_tfm *tfm)
925 {
926 return omap_sham_cra_init_alg(tfm, NULL);
927 }
928
929 static int omap_sham_cra_sha1_init(struct crypto_tfm *tfm)
930 {
931 return omap_sham_cra_init_alg(tfm, "sha1");
932 }
933
934 static int omap_sham_cra_md5_init(struct crypto_tfm *tfm)
935 {
936 return omap_sham_cra_init_alg(tfm, "md5");
937 }
938
939 static void omap_sham_cra_exit(struct crypto_tfm *tfm)
940 {
941 struct omap_sham_ctx *tctx = crypto_tfm_ctx(tfm);
942
943 crypto_free_shash(tctx->fallback);
944 tctx->fallback = NULL;
945
946 if (tctx->flags & FLAGS_HMAC) {
947 struct omap_sham_hmac_ctx *bctx = tctx->base;
948 crypto_free_shash(bctx->shash);
949 }
950 }
951
952 static struct ahash_alg algs[] = {
953 {
954 .init = omap_sham_init,
955 .update = omap_sham_update,
956 .final = omap_sham_final,
957 .finup = omap_sham_finup,
958 .digest = omap_sham_digest,
959 .halg.digestsize = SHA1_DIGEST_SIZE,
960 .halg.base = {
961 .cra_name = "sha1",
962 .cra_driver_name = "omap-sha1",
963 .cra_priority = 100,
964 .cra_flags = CRYPTO_ALG_TYPE_AHASH |
965 CRYPTO_ALG_ASYNC |
966 CRYPTO_ALG_NEED_FALLBACK,
967 .cra_blocksize = SHA1_BLOCK_SIZE,
968 .cra_ctxsize = sizeof(struct omap_sham_ctx),
969 .cra_alignmask = 0,
970 .cra_module = THIS_MODULE,
971 .cra_init = omap_sham_cra_init,
972 .cra_exit = omap_sham_cra_exit,
973 }
974 },
975 {
976 .init = omap_sham_init,
977 .update = omap_sham_update,
978 .final = omap_sham_final,
979 .finup = omap_sham_finup,
980 .digest = omap_sham_digest,
981 .halg.digestsize = MD5_DIGEST_SIZE,
982 .halg.base = {
983 .cra_name = "md5",
984 .cra_driver_name = "omap-md5",
985 .cra_priority = 100,
986 .cra_flags = CRYPTO_ALG_TYPE_AHASH |
987 CRYPTO_ALG_ASYNC |
988 CRYPTO_ALG_NEED_FALLBACK,
989 .cra_blocksize = SHA1_BLOCK_SIZE,
990 .cra_ctxsize = sizeof(struct omap_sham_ctx),
991 .cra_alignmask = OMAP_ALIGN_MASK,
992 .cra_module = THIS_MODULE,
993 .cra_init = omap_sham_cra_init,
994 .cra_exit = omap_sham_cra_exit,
995 }
996 },
997 {
998 .init = omap_sham_init,
999 .update = omap_sham_update,
1000 .final = omap_sham_final,
1001 .finup = omap_sham_finup,
1002 .digest = omap_sham_digest,
1003 .setkey = omap_sham_setkey,
1004 .halg.digestsize = SHA1_DIGEST_SIZE,
1005 .halg.base = {
1006 .cra_name = "hmac(sha1)",
1007 .cra_driver_name = "omap-hmac-sha1",
1008 .cra_priority = 100,
1009 .cra_flags = CRYPTO_ALG_TYPE_AHASH |
1010 CRYPTO_ALG_ASYNC |
1011 CRYPTO_ALG_NEED_FALLBACK,
1012 .cra_blocksize = SHA1_BLOCK_SIZE,
1013 .cra_ctxsize = sizeof(struct omap_sham_ctx) +
1014 sizeof(struct omap_sham_hmac_ctx),
1015 .cra_alignmask = OMAP_ALIGN_MASK,
1016 .cra_module = THIS_MODULE,
1017 .cra_init = omap_sham_cra_sha1_init,
1018 .cra_exit = omap_sham_cra_exit,
1019 }
1020 },
1021 {
1022 .init = omap_sham_init,
1023 .update = omap_sham_update,
1024 .final = omap_sham_final,
1025 .finup = omap_sham_finup,
1026 .digest = omap_sham_digest,
1027 .setkey = omap_sham_setkey,
1028 .halg.digestsize = MD5_DIGEST_SIZE,
1029 .halg.base = {
1030 .cra_name = "hmac(md5)",
1031 .cra_driver_name = "omap-hmac-md5",
1032 .cra_priority = 100,
1033 .cra_flags = CRYPTO_ALG_TYPE_AHASH |
1034 CRYPTO_ALG_ASYNC |
1035 CRYPTO_ALG_NEED_FALLBACK,
1036 .cra_blocksize = SHA1_BLOCK_SIZE,
1037 .cra_ctxsize = sizeof(struct omap_sham_ctx) +
1038 sizeof(struct omap_sham_hmac_ctx),
1039 .cra_alignmask = OMAP_ALIGN_MASK,
1040 .cra_module = THIS_MODULE,
1041 .cra_init = omap_sham_cra_md5_init,
1042 .cra_exit = omap_sham_cra_exit,
1043 }
1044 }
1045 };
1046
1047 static void omap_sham_done_task(unsigned long data)
1048 {
1049 struct omap_sham_dev *dd = (struct omap_sham_dev *)data;
1050 struct ahash_request *req = dd->req;
1051 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
1052 int ready = 0, err = 0;
1053
1054 if (ctx->flags & FLAGS_OUTPUT_READY) {
1055 ctx->flags &= ~FLAGS_OUTPUT_READY;
1056 ready = 1;
1057 }
1058
1059 if (dd->flags & FLAGS_DMA_ACTIVE) {
1060 dd->flags &= ~FLAGS_DMA_ACTIVE;
1061 omap_sham_update_dma_stop(dd);
1062 if (!dd->err)
1063 err = omap_sham_update_dma_start(dd);
1064 }
1065
1066 err = dd->err ? : err;
1067
1068 if (err != -EINPROGRESS && (ready || err)) {
1069 dev_dbg(dd->dev, "update done: err: %d\n", err);
1070 /* finish curent request */
1071 omap_sham_finish_req(req, err);
1072 /* start new request */
1073 omap_sham_handle_queue(dd, NULL);
1074 }
1075 }
1076
1077 static void omap_sham_queue_task(unsigned long data)
1078 {
1079 struct omap_sham_dev *dd = (struct omap_sham_dev *)data;
1080
1081 omap_sham_handle_queue(dd, NULL);
1082 }
1083
1084 static irqreturn_t omap_sham_irq(int irq, void *dev_id)
1085 {
1086 struct omap_sham_dev *dd = dev_id;
1087 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
1088
1089 if (!ctx) {
1090 dev_err(dd->dev, "unknown interrupt.\n");
1091 return IRQ_HANDLED;
1092 }
1093
1094 if (unlikely(ctx->flags & FLAGS_FINAL))
1095 /* final -> allow device to go to power-saving mode */
1096 omap_sham_write_mask(dd, SHA_REG_CTRL, 0, SHA_REG_CTRL_LENGTH);
1097
1098 omap_sham_write_mask(dd, SHA_REG_CTRL, SHA_REG_CTRL_OUTPUT_READY,
1099 SHA_REG_CTRL_OUTPUT_READY);
1100 omap_sham_read(dd, SHA_REG_CTRL);
1101
1102 ctx->flags |= FLAGS_OUTPUT_READY;
1103 dd->err = 0;
1104 tasklet_schedule(&dd->done_task);
1105
1106 return IRQ_HANDLED;
1107 }
1108
1109 static void omap_sham_dma_callback(int lch, u16 ch_status, void *data)
1110 {
1111 struct omap_sham_dev *dd = data;
1112
1113 if (ch_status != OMAP_DMA_BLOCK_IRQ) {
1114 pr_err("omap-sham DMA error status: 0x%hx\n", ch_status);
1115 dd->err = -EIO;
1116 dd->flags &= ~FLAGS_INIT; /* request to re-initialize */
1117 }
1118
1119 tasklet_schedule(&dd->done_task);
1120 }
1121
1122 static int omap_sham_dma_init(struct omap_sham_dev *dd)
1123 {
1124 int err;
1125
1126 dd->dma_lch = -1;
1127
1128 err = omap_request_dma(dd->dma, dev_name(dd->dev),
1129 omap_sham_dma_callback, dd, &dd->dma_lch);
1130 if (err) {
1131 dev_err(dd->dev, "Unable to request DMA channel\n");
1132 return err;
1133 }
1134
1135 return 0;
1136 }
1137
1138 static void omap_sham_dma_cleanup(struct omap_sham_dev *dd)
1139 {
1140 if (dd->dma_lch >= 0) {
1141 omap_free_dma(dd->dma_lch);
1142 dd->dma_lch = -1;
1143 }
1144 }
1145
1146 static int __devinit omap_sham_probe(struct platform_device *pdev)
1147 {
1148 struct omap_sham_dev *dd;
1149 struct device *dev = &pdev->dev;
1150 struct resource *res;
1151 int err, i, j;
1152
1153 dd = kzalloc(sizeof(struct omap_sham_dev), GFP_KERNEL);
1154 if (dd == NULL) {
1155 dev_err(dev, "unable to alloc data struct.\n");
1156 err = -ENOMEM;
1157 goto data_err;
1158 }
1159 dd->dev = dev;
1160 platform_set_drvdata(pdev, dd);
1161
1162 INIT_LIST_HEAD(&dd->list);
1163 spin_lock_init(&dd->lock);
1164 tasklet_init(&dd->done_task, omap_sham_done_task, (unsigned long)dd);
1165 tasklet_init(&dd->queue_task, omap_sham_queue_task, (unsigned long)dd);
1166 crypto_init_queue(&dd->queue, OMAP_SHAM_QUEUE_LENGTH);
1167
1168 dd->irq = -1;
1169
1170 /* Get the base address */
1171 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1172 if (!res) {
1173 dev_err(dev, "no MEM resource info\n");
1174 err = -ENODEV;
1175 goto res_err;
1176 }
1177 dd->phys_base = res->start;
1178
1179 /* Get the DMA */
1180 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1181 if (!res) {
1182 dev_err(dev, "no DMA resource info\n");
1183 err = -ENODEV;
1184 goto res_err;
1185 }
1186 dd->dma = res->start;
1187
1188 /* Get the IRQ */
1189 dd->irq = platform_get_irq(pdev, 0);
1190 if (dd->irq < 0) {
1191 dev_err(dev, "no IRQ resource info\n");
1192 err = dd->irq;
1193 goto res_err;
1194 }
1195
1196 err = request_irq(dd->irq, omap_sham_irq,
1197 IRQF_TRIGGER_LOW, dev_name(dev), dd);
1198 if (err) {
1199 dev_err(dev, "unable to request irq.\n");
1200 goto res_err;
1201 }
1202
1203 err = omap_sham_dma_init(dd);
1204 if (err)
1205 goto dma_err;
1206
1207 /* Initializing the clock */
1208 dd->iclk = clk_get(dev, "ick");
1209 if (!dd->iclk) {
1210 dev_err(dev, "clock intialization failed.\n");
1211 err = -ENODEV;
1212 goto clk_err;
1213 }
1214
1215 dd->io_base = ioremap(dd->phys_base, SZ_4K);
1216 if (!dd->io_base) {
1217 dev_err(dev, "can't ioremap\n");
1218 err = -ENOMEM;
1219 goto io_err;
1220 }
1221
1222 clk_enable(dd->iclk);
1223 dev_info(dev, "hw accel on OMAP rev %u.%u\n",
1224 (omap_sham_read(dd, SHA_REG_REV) & SHA_REG_REV_MAJOR) >> 4,
1225 omap_sham_read(dd, SHA_REG_REV) & SHA_REG_REV_MINOR);
1226 clk_disable(dd->iclk);
1227
1228 spin_lock(&sham.lock);
1229 list_add_tail(&dd->list, &sham.dev_list);
1230 spin_unlock(&sham.lock);
1231
1232 for (i = 0; i < ARRAY_SIZE(algs); i++) {
1233 err = crypto_register_ahash(&algs[i]);
1234 if (err)
1235 goto err_algs;
1236 }
1237
1238 return 0;
1239
1240 err_algs:
1241 for (j = 0; j < i; j++)
1242 crypto_unregister_ahash(&algs[j]);
1243 iounmap(dd->io_base);
1244 io_err:
1245 clk_put(dd->iclk);
1246 clk_err:
1247 omap_sham_dma_cleanup(dd);
1248 dma_err:
1249 if (dd->irq >= 0)
1250 free_irq(dd->irq, dd);
1251 res_err:
1252 kfree(dd);
1253 dd = NULL;
1254 data_err:
1255 dev_err(dev, "initialization failed.\n");
1256
1257 return err;
1258 }
1259
1260 static int __devexit omap_sham_remove(struct platform_device *pdev)
1261 {
1262 static struct omap_sham_dev *dd;
1263 int i;
1264
1265 dd = platform_get_drvdata(pdev);
1266 if (!dd)
1267 return -ENODEV;
1268 spin_lock(&sham.lock);
1269 list_del(&dd->list);
1270 spin_unlock(&sham.lock);
1271 for (i = 0; i < ARRAY_SIZE(algs); i++)
1272 crypto_unregister_ahash(&algs[i]);
1273 tasklet_kill(&dd->done_task);
1274 tasklet_kill(&dd->queue_task);
1275 iounmap(dd->io_base);
1276 clk_put(dd->iclk);
1277 omap_sham_dma_cleanup(dd);
1278 if (dd->irq >= 0)
1279 free_irq(dd->irq, dd);
1280 kfree(dd);
1281 dd = NULL;
1282
1283 return 0;
1284 }
1285
1286 static struct platform_driver omap_sham_driver = {
1287 .probe = omap_sham_probe,
1288 .remove = omap_sham_remove,
1289 .driver = {
1290 .name = "omap-sham",
1291 .owner = THIS_MODULE,
1292 },
1293 };
1294
1295 static int __init omap_sham_mod_init(void)
1296 {
1297 pr_info("loading %s driver\n", "omap-sham");
1298
1299 if (!cpu_class_is_omap2() ||
1300 omap_type() != OMAP2_DEVICE_TYPE_SEC) {
1301 pr_err("Unsupported cpu\n");
1302 return -ENODEV;
1303 }
1304
1305 return platform_driver_register(&omap_sham_driver);
1306 }
1307
1308 static void __exit omap_sham_mod_exit(void)
1309 {
1310 platform_driver_unregister(&omap_sham_driver);
1311 }
1312
1313 module_init(omap_sham_mod_init);
1314 module_exit(omap_sham_mod_exit);
1315
1316 MODULE_DESCRIPTION("OMAP SHA1/MD5 hw acceleration support.");
1317 MODULE_LICENSE("GPL v2");
1318 MODULE_AUTHOR("Dmitry Kasatkin");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree