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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux/fpc-iii.git] / drivers / crypto / atmel-sha.c
blob0618be06b9fb2402fb6b2ed6238e8d910ef19d9a
1 /*
2 * Cryptographic API.
3 *
4 * Support for ATMEL SHA1/SHA256 HW acceleration.
5 *
6 * Copyright (c) 2012 Eukréa Electromatique - ATMEL
7 * Author: Nicolas Royer <nicolas@eukrea.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 omap-sham.c drivers.
14 */
15
16
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/slab.h>
20 #include <linux/err.h>
21 #include <linux/clk.h>
22 #include <linux/io.h>
23 #include <linux/hw_random.h>
24 #include <linux/platform_device.h>
25
26 #include <linux/device.h>
27 #include <linux/init.h>
28 #include <linux/errno.h>
29 #include <linux/interrupt.h>
30 #include <linux/irq.h>
31 #include <linux/scatterlist.h>
32 #include <linux/dma-mapping.h>
33 #include <linux/of_device.h>
34 #include <linux/delay.h>
35 #include <linux/crypto.h>
36 #include <linux/cryptohash.h>
37 #include <crypto/scatterwalk.h>
38 #include <crypto/algapi.h>
39 #include <crypto/sha.h>
40 #include <crypto/hash.h>
41 #include <crypto/internal/hash.h>
42 #include <linux/platform_data/crypto-atmel.h>
43 #include "atmel-sha-regs.h"
44
45 /* SHA flags */
46 #define SHA_FLAGS_BUSY BIT(0)
47 #define SHA_FLAGS_FINAL BIT(1)
48 #define SHA_FLAGS_DMA_ACTIVE BIT(2)
49 #define SHA_FLAGS_OUTPUT_READY BIT(3)
50 #define SHA_FLAGS_INIT BIT(4)
51 #define SHA_FLAGS_CPU BIT(5)
52 #define SHA_FLAGS_DMA_READY BIT(6)
53
54 #define SHA_FLAGS_FINUP BIT(16)
55 #define SHA_FLAGS_SG BIT(17)
56 #define SHA_FLAGS_SHA1 BIT(18)
57 #define SHA_FLAGS_SHA224 BIT(19)
58 #define SHA_FLAGS_SHA256 BIT(20)
59 #define SHA_FLAGS_SHA384 BIT(21)
60 #define SHA_FLAGS_SHA512 BIT(22)
61 #define SHA_FLAGS_ERROR BIT(23)
62 #define SHA_FLAGS_PAD BIT(24)
63
64 #define SHA_OP_UPDATE 1
65 #define SHA_OP_FINAL 2
66
67 #define SHA_BUFFER_LEN PAGE_SIZE
68
69 #define ATMEL_SHA_DMA_THRESHOLD 56
70
71 struct atmel_sha_caps {
72 bool has_dma;
73 bool has_dualbuff;
74 bool has_sha224;
75 bool has_sha_384_512;
76 };
77
78 struct atmel_sha_dev;
79
80 struct atmel_sha_reqctx {
81 struct atmel_sha_dev *dd;
82 unsigned long flags;
83 unsigned long op;
84
85 u8 digest[SHA512_DIGEST_SIZE] __aligned(sizeof(u32));
86 u64 digcnt[2];
87 size_t bufcnt;
88 size_t buflen;
89 dma_addr_t dma_addr;
90
91 /* walk state */
92 struct scatterlist *sg;
93 unsigned int offset; /* offset in current sg */
94 unsigned int total; /* total request */
95
96 size_t block_size;
97
98 u8 buffer[0] __aligned(sizeof(u32));
99 };
100
101 struct atmel_sha_ctx {
102 struct atmel_sha_dev *dd;
103
104 unsigned long flags;
105
106 /* fallback stuff */
107 struct crypto_shash *fallback;
108
109 };
110
111 #define ATMEL_SHA_QUEUE_LENGTH 50
112
113 struct atmel_sha_dma {
114 struct dma_chan *chan;
115 struct dma_slave_config dma_conf;
116 };
117
118 struct atmel_sha_dev {
119 struct list_head list;
120 unsigned long phys_base;
121 struct device *dev;
122 struct clk *iclk;
123 int irq;
124 void __iomem *io_base;
125
126 spinlock_t lock;
127 int err;
128 struct tasklet_struct done_task;
129
130 unsigned long flags;
131 struct crypto_queue queue;
132 struct ahash_request *req;
133
134 struct atmel_sha_dma dma_lch_in;
135
136 struct atmel_sha_caps caps;
137
138 u32 hw_version;
139 };
140
141 struct atmel_sha_drv {
142 struct list_head dev_list;
143 spinlock_t lock;
144 };
145
146 static struct atmel_sha_drv atmel_sha = {
147 .dev_list = LIST_HEAD_INIT(atmel_sha.dev_list),
148 .lock = __SPIN_LOCK_UNLOCKED(atmel_sha.lock),
149 };
150
151 static inline u32 atmel_sha_read(struct atmel_sha_dev *dd, u32 offset)
152 {
153 return readl_relaxed(dd->io_base + offset);
154 }
155
156 static inline void atmel_sha_write(struct atmel_sha_dev *dd,
157 u32 offset, u32 value)
158 {
159 writel_relaxed(value, dd->io_base + offset);
160 }
161
162 static size_t atmel_sha_append_sg(struct atmel_sha_reqctx *ctx)
163 {
164 size_t count;
165
166 while ((ctx->bufcnt < ctx->buflen) && ctx->total) {
167 count = min(ctx->sg->length - ctx->offset, ctx->total);
168 count = min(count, ctx->buflen - ctx->bufcnt);
169
170 if (count <= 0)
171 break;
172
173 scatterwalk_map_and_copy(ctx->buffer + ctx->bufcnt, ctx->sg,
174 ctx->offset, count, 0);
175
176 ctx->bufcnt += count;
177 ctx->offset += count;
178 ctx->total -= count;
179
180 if (ctx->offset == ctx->sg->length) {
181 ctx->sg = sg_next(ctx->sg);
182 if (ctx->sg)
183 ctx->offset = 0;
184 else
185 ctx->total = 0;
186 }
187 }
188
189 return 0;
190 }
191
192 /*
193 * The purpose of this padding is to ensure that the padded message is a
194 * multiple of 512 bits (SHA1/SHA224/SHA256) or 1024 bits (SHA384/SHA512).
195 * The bit "1" is appended at the end of the message followed by
196 * "padlen-1" zero bits. Then a 64 bits block (SHA1/SHA224/SHA256) or
197 * 128 bits block (SHA384/SHA512) equals to the message length in bits
198 * is appended.
199 *
200 * For SHA1/SHA224/SHA256, padlen is calculated as followed:
201 * - if message length < 56 bytes then padlen = 56 - message length
202 * - else padlen = 64 + 56 - message length
203 *
204 * For SHA384/SHA512, padlen is calculated as followed:
205 * - if message length < 112 bytes then padlen = 112 - message length
206 * - else padlen = 128 + 112 - message length
207 */
208 static void atmel_sha_fill_padding(struct atmel_sha_reqctx *ctx, int length)
209 {
210 unsigned int index, padlen;
211 u64 bits[2];
212 u64 size[2];
213
214 size[0] = ctx->digcnt[0];
215 size[1] = ctx->digcnt[1];
216
217 size[0] += ctx->bufcnt;
218 if (size[0] < ctx->bufcnt)
219 size[1]++;
220
221 size[0] += length;
222 if (size[0] < length)
223 size[1]++;
224
225 bits[1] = cpu_to_be64(size[0] << 3);
226 bits[0] = cpu_to_be64(size[1] << 3 | size[0] >> 61);
227
228 if (ctx->flags & (SHA_FLAGS_SHA384 | SHA_FLAGS_SHA512)) {
229 index = ctx->bufcnt & 0x7f;
230 padlen = (index < 112) ? (112 - index) : ((128+112) - index);
231 *(ctx->buffer + ctx->bufcnt) = 0x80;
232 memset(ctx->buffer + ctx->bufcnt + 1, 0, padlen-1);
233 memcpy(ctx->buffer + ctx->bufcnt + padlen, bits, 16);
234 ctx->bufcnt += padlen + 16;
235 ctx->flags |= SHA_FLAGS_PAD;
236 } else {
237 index = ctx->bufcnt & 0x3f;
238 padlen = (index < 56) ? (56 - index) : ((64+56) - index);
239 *(ctx->buffer + ctx->bufcnt) = 0x80;
240 memset(ctx->buffer + ctx->bufcnt + 1, 0, padlen-1);
241 memcpy(ctx->buffer + ctx->bufcnt + padlen, &bits[1], 8);
242 ctx->bufcnt += padlen + 8;
243 ctx->flags |= SHA_FLAGS_PAD;
244 }
245 }
246
247 static int atmel_sha_init(struct ahash_request *req)
248 {
249 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
250 struct atmel_sha_ctx *tctx = crypto_ahash_ctx(tfm);
251 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
252 struct atmel_sha_dev *dd = NULL;
253 struct atmel_sha_dev *tmp;
254
255 spin_lock_bh(&atmel_sha.lock);
256 if (!tctx->dd) {
257 list_for_each_entry(tmp, &atmel_sha.dev_list, list) {
258 dd = tmp;
259 break;
260 }
261 tctx->dd = dd;
262 } else {
263 dd = tctx->dd;
264 }
265
266 spin_unlock_bh(&atmel_sha.lock);
267
268 ctx->dd = dd;
269
270 ctx->flags = 0;
271
272 dev_dbg(dd->dev, "init: digest size: %d\n",
273 crypto_ahash_digestsize(tfm));
274
275 switch (crypto_ahash_digestsize(tfm)) {
276 case SHA1_DIGEST_SIZE:
277 ctx->flags |= SHA_FLAGS_SHA1;
278 ctx->block_size = SHA1_BLOCK_SIZE;
279 break;
280 case SHA224_DIGEST_SIZE:
281 ctx->flags |= SHA_FLAGS_SHA224;
282 ctx->block_size = SHA224_BLOCK_SIZE;
283 break;
284 case SHA256_DIGEST_SIZE:
285 ctx->flags |= SHA_FLAGS_SHA256;
286 ctx->block_size = SHA256_BLOCK_SIZE;
287 break;
288 case SHA384_DIGEST_SIZE:
289 ctx->flags |= SHA_FLAGS_SHA384;
290 ctx->block_size = SHA384_BLOCK_SIZE;
291 break;
292 case SHA512_DIGEST_SIZE:
293 ctx->flags |= SHA_FLAGS_SHA512;
294 ctx->block_size = SHA512_BLOCK_SIZE;
295 break;
296 default:
297 return -EINVAL;
298 break;
299 }
300
301 ctx->bufcnt = 0;
302 ctx->digcnt[0] = 0;
303 ctx->digcnt[1] = 0;
304 ctx->buflen = SHA_BUFFER_LEN;
305
306 return 0;
307 }
308
309 static void atmel_sha_write_ctrl(struct atmel_sha_dev *dd, int dma)
310 {
311 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
312 u32 valcr = 0, valmr = SHA_MR_MODE_AUTO;
313
314 if (likely(dma)) {
315 if (!dd->caps.has_dma)
316 atmel_sha_write(dd, SHA_IER, SHA_INT_TXBUFE);
317 valmr = SHA_MR_MODE_PDC;
318 if (dd->caps.has_dualbuff)
319 valmr |= SHA_MR_DUALBUFF;
320 } else {
321 atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
322 }
323
324 if (ctx->flags & SHA_FLAGS_SHA1)
325 valmr |= SHA_MR_ALGO_SHA1;
326 else if (ctx->flags & SHA_FLAGS_SHA224)
327 valmr |= SHA_MR_ALGO_SHA224;
328 else if (ctx->flags & SHA_FLAGS_SHA256)
329 valmr |= SHA_MR_ALGO_SHA256;
330 else if (ctx->flags & SHA_FLAGS_SHA384)
331 valmr |= SHA_MR_ALGO_SHA384;
332 else if (ctx->flags & SHA_FLAGS_SHA512)
333 valmr |= SHA_MR_ALGO_SHA512;
334
335 /* Setting CR_FIRST only for the first iteration */
336 if (!(ctx->digcnt[0] || ctx->digcnt[1]))
337 valcr = SHA_CR_FIRST;
338
339 atmel_sha_write(dd, SHA_CR, valcr);
340 atmel_sha_write(dd, SHA_MR, valmr);
341 }
342
343 static int atmel_sha_xmit_cpu(struct atmel_sha_dev *dd, const u8 *buf,
344 size_t length, int final)
345 {
346 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
347 int count, len32;
348 const u32 *buffer = (const u32 *)buf;
349
350 dev_dbg(dd->dev, "xmit_cpu: digcnt: 0x%llx 0x%llx, length: %d, final: %d\n",
351 ctx->digcnt[1], ctx->digcnt[0], length, final);
352
353 atmel_sha_write_ctrl(dd, 0);
354
355 /* should be non-zero before next lines to disable clocks later */
356 ctx->digcnt[0] += length;
357 if (ctx->digcnt[0] < length)
358 ctx->digcnt[1]++;
359
360 if (final)
361 dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */
362
363 len32 = DIV_ROUND_UP(length, sizeof(u32));
364
365 dd->flags |= SHA_FLAGS_CPU;
366
367 for (count = 0; count < len32; count++)
368 atmel_sha_write(dd, SHA_REG_DIN(count), buffer[count]);
369
370 return -EINPROGRESS;
371 }
372
373 static int atmel_sha_xmit_pdc(struct atmel_sha_dev *dd, dma_addr_t dma_addr1,
374 size_t length1, dma_addr_t dma_addr2, size_t length2, int final)
375 {
376 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
377 int len32;
378
379 dev_dbg(dd->dev, "xmit_pdc: digcnt: 0x%llx 0x%llx, length: %d, final: %d\n",
380 ctx->digcnt[1], ctx->digcnt[0], length1, final);
381
382 len32 = DIV_ROUND_UP(length1, sizeof(u32));
383 atmel_sha_write(dd, SHA_PTCR, SHA_PTCR_TXTDIS);
384 atmel_sha_write(dd, SHA_TPR, dma_addr1);
385 atmel_sha_write(dd, SHA_TCR, len32);
386
387 len32 = DIV_ROUND_UP(length2, sizeof(u32));
388 atmel_sha_write(dd, SHA_TNPR, dma_addr2);
389 atmel_sha_write(dd, SHA_TNCR, len32);
390
391 atmel_sha_write_ctrl(dd, 1);
392
393 /* should be non-zero before next lines to disable clocks later */
394 ctx->digcnt[0] += length1;
395 if (ctx->digcnt[0] < length1)
396 ctx->digcnt[1]++;
397
398 if (final)
399 dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */
400
401 dd->flags |= SHA_FLAGS_DMA_ACTIVE;
402
403 /* Start DMA transfer */
404 atmel_sha_write(dd, SHA_PTCR, SHA_PTCR_TXTEN);
405
406 return -EINPROGRESS;
407 }
408
409 static void atmel_sha_dma_callback(void *data)
410 {
411 struct atmel_sha_dev *dd = data;
412
413 /* dma_lch_in - completed - wait DATRDY */
414 atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
415 }
416
417 static int atmel_sha_xmit_dma(struct atmel_sha_dev *dd, dma_addr_t dma_addr1,
418 size_t length1, dma_addr_t dma_addr2, size_t length2, int final)
419 {
420 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
421 struct dma_async_tx_descriptor *in_desc;
422 struct scatterlist sg[2];
423
424 dev_dbg(dd->dev, "xmit_dma: digcnt: 0x%llx 0x%llx, length: %d, final: %d\n",
425 ctx->digcnt[1], ctx->digcnt[0], length1, final);
426
427 if (ctx->flags & (SHA_FLAGS_SHA1 | SHA_FLAGS_SHA224 |
428 SHA_FLAGS_SHA256)) {
429 dd->dma_lch_in.dma_conf.src_maxburst = 16;
430 dd->dma_lch_in.dma_conf.dst_maxburst = 16;
431 } else {
432 dd->dma_lch_in.dma_conf.src_maxburst = 32;
433 dd->dma_lch_in.dma_conf.dst_maxburst = 32;
434 }
435
436 dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf);
437
438 if (length2) {
439 sg_init_table(sg, 2);
440 sg_dma_address(&sg[0]) = dma_addr1;
441 sg_dma_len(&sg[0]) = length1;
442 sg_dma_address(&sg[1]) = dma_addr2;
443 sg_dma_len(&sg[1]) = length2;
444 in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, sg, 2,
445 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
446 } else {
447 sg_init_table(sg, 1);
448 sg_dma_address(&sg[0]) = dma_addr1;
449 sg_dma_len(&sg[0]) = length1;
450 in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, sg, 1,
451 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
452 }
453 if (!in_desc)
454 return -EINVAL;
455
456 in_desc->callback = atmel_sha_dma_callback;
457 in_desc->callback_param = dd;
458
459 atmel_sha_write_ctrl(dd, 1);
460
461 /* should be non-zero before next lines to disable clocks later */
462 ctx->digcnt[0] += length1;
463 if (ctx->digcnt[0] < length1)
464 ctx->digcnt[1]++;
465
466 if (final)
467 dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */
468
469 dd->flags |= SHA_FLAGS_DMA_ACTIVE;
470
471 /* Start DMA transfer */
472 dmaengine_submit(in_desc);
473 dma_async_issue_pending(dd->dma_lch_in.chan);
474
475 return -EINPROGRESS;
476 }
477
478 static int atmel_sha_xmit_start(struct atmel_sha_dev *dd, dma_addr_t dma_addr1,
479 size_t length1, dma_addr_t dma_addr2, size_t length2, int final)
480 {
481 if (dd->caps.has_dma)
482 return atmel_sha_xmit_dma(dd, dma_addr1, length1,
483 dma_addr2, length2, final);
484 else
485 return atmel_sha_xmit_pdc(dd, dma_addr1, length1,
486 dma_addr2, length2, final);
487 }
488
489 static int atmel_sha_update_cpu(struct atmel_sha_dev *dd)
490 {
491 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
492 int bufcnt;
493
494 atmel_sha_append_sg(ctx);
495 atmel_sha_fill_padding(ctx, 0);
496 bufcnt = ctx->bufcnt;
497 ctx->bufcnt = 0;
498
499 return atmel_sha_xmit_cpu(dd, ctx->buffer, bufcnt, 1);
500 }
501
502 static int atmel_sha_xmit_dma_map(struct atmel_sha_dev *dd,
503 struct atmel_sha_reqctx *ctx,
504 size_t length, int final)
505 {
506 ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer,
507 ctx->buflen + ctx->block_size, DMA_TO_DEVICE);
508 if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
509 dev_err(dd->dev, "dma %u bytes error\n", ctx->buflen +
510 ctx->block_size);
511 return -EINVAL;
512 }
513
514 ctx->flags &= ~SHA_FLAGS_SG;
515
516 /* next call does not fail... so no unmap in the case of error */
517 return atmel_sha_xmit_start(dd, ctx->dma_addr, length, 0, 0, final);
518 }
519
520 static int atmel_sha_update_dma_slow(struct atmel_sha_dev *dd)
521 {
522 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
523 unsigned int final;
524 size_t count;
525
526 atmel_sha_append_sg(ctx);
527
528 final = (ctx->flags & SHA_FLAGS_FINUP) && !ctx->total;
529
530 dev_dbg(dd->dev, "slow: bufcnt: %u, digcnt: 0x%llx 0x%llx, final: %d\n",
531 ctx->bufcnt, ctx->digcnt[1], ctx->digcnt[0], final);
532
533 if (final)
534 atmel_sha_fill_padding(ctx, 0);
535
536 if (final || (ctx->bufcnt == ctx->buflen && ctx->total)) {
537 count = ctx->bufcnt;
538 ctx->bufcnt = 0;
539 return atmel_sha_xmit_dma_map(dd, ctx, count, final);
540 }
541
542 return 0;
543 }
544
545 static int atmel_sha_update_dma_start(struct atmel_sha_dev *dd)
546 {
547 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
548 unsigned int length, final, tail;
549 struct scatterlist *sg;
550 unsigned int count;
551
552 if (!ctx->total)
553 return 0;
554
555 if (ctx->bufcnt || ctx->offset)
556 return atmel_sha_update_dma_slow(dd);
557
558 dev_dbg(dd->dev, "fast: digcnt: 0x%llx 0x%llx, bufcnt: %u, total: %u\n",
559 ctx->digcnt[1], ctx->digcnt[0], ctx->bufcnt, ctx->total);
560
561 sg = ctx->sg;
562
563 if (!IS_ALIGNED(sg->offset, sizeof(u32)))
564 return atmel_sha_update_dma_slow(dd);
565
566 if (!sg_is_last(sg) && !IS_ALIGNED(sg->length, ctx->block_size))
567 /* size is not ctx->block_size aligned */
568 return atmel_sha_update_dma_slow(dd);
569
570 length = min(ctx->total, sg->length);
571
572 if (sg_is_last(sg)) {
573 if (!(ctx->flags & SHA_FLAGS_FINUP)) {
574 /* not last sg must be ctx->block_size aligned */
575 tail = length & (ctx->block_size - 1);
576 length -= tail;
577 }
578 }
579
580 ctx->total -= length;
581 ctx->offset = length; /* offset where to start slow */
582
583 final = (ctx->flags & SHA_FLAGS_FINUP) && !ctx->total;
584
585 /* Add padding */
586 if (final) {
587 tail = length & (ctx->block_size - 1);
588 length -= tail;
589 ctx->total += tail;
590 ctx->offset = length; /* offset where to start slow */
591
592 sg = ctx->sg;
593 atmel_sha_append_sg(ctx);
594
595 atmel_sha_fill_padding(ctx, length);
596
597 ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer,
598 ctx->buflen + ctx->block_size, DMA_TO_DEVICE);
599 if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
600 dev_err(dd->dev, "dma %u bytes error\n",
601 ctx->buflen + ctx->block_size);
602 return -EINVAL;
603 }
604
605 if (length == 0) {
606 ctx->flags &= ~SHA_FLAGS_SG;
607 count = ctx->bufcnt;
608 ctx->bufcnt = 0;
609 return atmel_sha_xmit_start(dd, ctx->dma_addr, count, 0,
610 0, final);
611 } else {
612 ctx->sg = sg;
613 if (!dma_map_sg(dd->dev, ctx->sg, 1,
614 DMA_TO_DEVICE)) {
615 dev_err(dd->dev, "dma_map_sg error\n");
616 return -EINVAL;
617 }
618
619 ctx->flags |= SHA_FLAGS_SG;
620
621 count = ctx->bufcnt;
622 ctx->bufcnt = 0;
623 return atmel_sha_xmit_start(dd, sg_dma_address(ctx->sg),
624 length, ctx->dma_addr, count, final);
625 }
626 }
627
628 if (!dma_map_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE)) {
629 dev_err(dd->dev, "dma_map_sg error\n");
630 return -EINVAL;
631 }
632
633 ctx->flags |= SHA_FLAGS_SG;
634
635 /* next call does not fail... so no unmap in the case of error */
636 return atmel_sha_xmit_start(dd, sg_dma_address(ctx->sg), length, 0,
637 0, final);
638 }
639
640 static int atmel_sha_update_dma_stop(struct atmel_sha_dev *dd)
641 {
642 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
643
644 if (ctx->flags & SHA_FLAGS_SG) {
645 dma_unmap_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE);
646 if (ctx->sg->length == ctx->offset) {
647 ctx->sg = sg_next(ctx->sg);
648 if (ctx->sg)
649 ctx->offset = 0;
650 }
651 if (ctx->flags & SHA_FLAGS_PAD) {
652 dma_unmap_single(dd->dev, ctx->dma_addr,
653 ctx->buflen + ctx->block_size, DMA_TO_DEVICE);
654 }
655 } else {
656 dma_unmap_single(dd->dev, ctx->dma_addr, ctx->buflen +
657 ctx->block_size, DMA_TO_DEVICE);
658 }
659
660 return 0;
661 }
662
663 static int atmel_sha_update_req(struct atmel_sha_dev *dd)
664 {
665 struct ahash_request *req = dd->req;
666 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
667 int err;
668
669 dev_dbg(dd->dev, "update_req: total: %u, digcnt: 0x%llx 0x%llx\n",
670 ctx->total, ctx->digcnt[1], ctx->digcnt[0]);
671
672 if (ctx->flags & SHA_FLAGS_CPU)
673 err = atmel_sha_update_cpu(dd);
674 else
675 err = atmel_sha_update_dma_start(dd);
676
677 /* wait for dma completion before can take more data */
678 dev_dbg(dd->dev, "update: err: %d, digcnt: 0x%llx 0%llx\n",
679 err, ctx->digcnt[1], ctx->digcnt[0]);
680
681 return err;
682 }
683
684 static int atmel_sha_final_req(struct atmel_sha_dev *dd)
685 {
686 struct ahash_request *req = dd->req;
687 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
688 int err = 0;
689 int count;
690
691 if (ctx->bufcnt >= ATMEL_SHA_DMA_THRESHOLD) {
692 atmel_sha_fill_padding(ctx, 0);
693 count = ctx->bufcnt;
694 ctx->bufcnt = 0;
695 err = atmel_sha_xmit_dma_map(dd, ctx, count, 1);
696 }
697 /* faster to handle last block with cpu */
698 else {
699 atmel_sha_fill_padding(ctx, 0);
700 count = ctx->bufcnt;
701 ctx->bufcnt = 0;
702 err = atmel_sha_xmit_cpu(dd, ctx->buffer, count, 1);
703 }
704
705 dev_dbg(dd->dev, "final_req: err: %d\n", err);
706
707 return err;
708 }
709
710 static void atmel_sha_copy_hash(struct ahash_request *req)
711 {
712 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
713 u32 *hash = (u32 *)ctx->digest;
714 int i;
715
716 if (ctx->flags & SHA_FLAGS_SHA1)
717 for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(u32); i++)
718 hash[i] = atmel_sha_read(ctx->dd, SHA_REG_DIGEST(i));
719 else if (ctx->flags & SHA_FLAGS_SHA224)
720 for (i = 0; i < SHA224_DIGEST_SIZE / sizeof(u32); i++)
721 hash[i] = atmel_sha_read(ctx->dd, SHA_REG_DIGEST(i));
722 else if (ctx->flags & SHA_FLAGS_SHA256)
723 for (i = 0; i < SHA256_DIGEST_SIZE / sizeof(u32); i++)
724 hash[i] = atmel_sha_read(ctx->dd, SHA_REG_DIGEST(i));
725 else if (ctx->flags & SHA_FLAGS_SHA384)
726 for (i = 0; i < SHA384_DIGEST_SIZE / sizeof(u32); i++)
727 hash[i] = atmel_sha_read(ctx->dd, SHA_REG_DIGEST(i));
728 else
729 for (i = 0; i < SHA512_DIGEST_SIZE / sizeof(u32); i++)
730 hash[i] = atmel_sha_read(ctx->dd, SHA_REG_DIGEST(i));
731 }
732
733 static void atmel_sha_copy_ready_hash(struct ahash_request *req)
734 {
735 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
736
737 if (!req->result)
738 return;
739
740 if (ctx->flags & SHA_FLAGS_SHA1)
741 memcpy(req->result, ctx->digest, SHA1_DIGEST_SIZE);
742 else if (ctx->flags & SHA_FLAGS_SHA224)
743 memcpy(req->result, ctx->digest, SHA224_DIGEST_SIZE);
744 else if (ctx->flags & SHA_FLAGS_SHA256)
745 memcpy(req->result, ctx->digest, SHA256_DIGEST_SIZE);
746 else if (ctx->flags & SHA_FLAGS_SHA384)
747 memcpy(req->result, ctx->digest, SHA384_DIGEST_SIZE);
748 else
749 memcpy(req->result, ctx->digest, SHA512_DIGEST_SIZE);
750 }
751
752 static int atmel_sha_finish(struct ahash_request *req)
753 {
754 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
755 struct atmel_sha_dev *dd = ctx->dd;
756 int err = 0;
757
758 if (ctx->digcnt[0] || ctx->digcnt[1])
759 atmel_sha_copy_ready_hash(req);
760
761 dev_dbg(dd->dev, "digcnt: 0x%llx 0x%llx, bufcnt: %d\n", ctx->digcnt[1],
762 ctx->digcnt[0], ctx->bufcnt);
763
764 return err;
765 }
766
767 static void atmel_sha_finish_req(struct ahash_request *req, int err)
768 {
769 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
770 struct atmel_sha_dev *dd = ctx->dd;
771
772 if (!err) {
773 atmel_sha_copy_hash(req);
774 if (SHA_FLAGS_FINAL & dd->flags)
775 err = atmel_sha_finish(req);
776 } else {
777 ctx->flags |= SHA_FLAGS_ERROR;
778 }
779
780 /* atomic operation is not needed here */
781 dd->flags &= ~(SHA_FLAGS_BUSY | SHA_FLAGS_FINAL | SHA_FLAGS_CPU |
782 SHA_FLAGS_DMA_READY | SHA_FLAGS_OUTPUT_READY);
783
784 clk_disable_unprepare(dd->iclk);
785
786 if (req->base.complete)
787 req->base.complete(&req->base, err);
788
789 /* handle new request */
790 tasklet_schedule(&dd->done_task);
791 }
792
793 static int atmel_sha_hw_init(struct atmel_sha_dev *dd)
794 {
795 clk_prepare_enable(dd->iclk);
796
797 if (!(SHA_FLAGS_INIT & dd->flags)) {
798 atmel_sha_write(dd, SHA_CR, SHA_CR_SWRST);
799 dd->flags |= SHA_FLAGS_INIT;
800 dd->err = 0;
801 }
802
803 return 0;
804 }
805
806 static inline unsigned int atmel_sha_get_version(struct atmel_sha_dev *dd)
807 {
808 return atmel_sha_read(dd, SHA_HW_VERSION) & 0x00000fff;
809 }
810
811 static void atmel_sha_hw_version_init(struct atmel_sha_dev *dd)
812 {
813 atmel_sha_hw_init(dd);
814
815 dd->hw_version = atmel_sha_get_version(dd);
816
817 dev_info(dd->dev,
818 "version: 0x%x\n", dd->hw_version);
819
820 clk_disable_unprepare(dd->iclk);
821 }
822
823 static int atmel_sha_handle_queue(struct atmel_sha_dev *dd,
824 struct ahash_request *req)
825 {
826 struct crypto_async_request *async_req, *backlog;
827 struct atmel_sha_reqctx *ctx;
828 unsigned long flags;
829 int err = 0, ret = 0;
830
831 spin_lock_irqsave(&dd->lock, flags);
832 if (req)
833 ret = ahash_enqueue_request(&dd->queue, req);
834
835 if (SHA_FLAGS_BUSY & dd->flags) {
836 spin_unlock_irqrestore(&dd->lock, flags);
837 return ret;
838 }
839
840 backlog = crypto_get_backlog(&dd->queue);
841 async_req = crypto_dequeue_request(&dd->queue);
842 if (async_req)
843 dd->flags |= SHA_FLAGS_BUSY;
844
845 spin_unlock_irqrestore(&dd->lock, flags);
846
847 if (!async_req)
848 return ret;
849
850 if (backlog)
851 backlog->complete(backlog, -EINPROGRESS);
852
853 req = ahash_request_cast(async_req);
854 dd->req = req;
855 ctx = ahash_request_ctx(req);
856
857 dev_dbg(dd->dev, "handling new req, op: %lu, nbytes: %d\n",
858 ctx->op, req->nbytes);
859
860 err = atmel_sha_hw_init(dd);
861
862 if (err)
863 goto err1;
864
865 if (ctx->op == SHA_OP_UPDATE) {
866 err = atmel_sha_update_req(dd);
867 if (err != -EINPROGRESS && (ctx->flags & SHA_FLAGS_FINUP))
868 /* no final() after finup() */
869 err = atmel_sha_final_req(dd);
870 } else if (ctx->op == SHA_OP_FINAL) {
871 err = atmel_sha_final_req(dd);
872 }
873
874 err1:
875 if (err != -EINPROGRESS)
876 /* done_task will not finish it, so do it here */
877 atmel_sha_finish_req(req, err);
878
879 dev_dbg(dd->dev, "exit, err: %d\n", err);
880
881 return ret;
882 }
883
884 static int atmel_sha_enqueue(struct ahash_request *req, unsigned int op)
885 {
886 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
887 struct atmel_sha_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
888 struct atmel_sha_dev *dd = tctx->dd;
889
890 ctx->op = op;
891
892 return atmel_sha_handle_queue(dd, req);
893 }
894
895 static int atmel_sha_update(struct ahash_request *req)
896 {
897 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
898
899 if (!req->nbytes)
900 return 0;
901
902 ctx->total = req->nbytes;
903 ctx->sg = req->src;
904 ctx->offset = 0;
905
906 if (ctx->flags & SHA_FLAGS_FINUP) {
907 if (ctx->bufcnt + ctx->total < ATMEL_SHA_DMA_THRESHOLD)
908 /* faster to use CPU for short transfers */
909 ctx->flags |= SHA_FLAGS_CPU;
910 } else if (ctx->bufcnt + ctx->total < ctx->buflen) {
911 atmel_sha_append_sg(ctx);
912 return 0;
913 }
914 return atmel_sha_enqueue(req, SHA_OP_UPDATE);
915 }
916
917 static int atmel_sha_final(struct ahash_request *req)
918 {
919 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
920 struct atmel_sha_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
921 struct atmel_sha_dev *dd = tctx->dd;
922
923 int err = 0;
924
925 ctx->flags |= SHA_FLAGS_FINUP;
926
927 if (ctx->flags & SHA_FLAGS_ERROR)
928 return 0; /* uncompleted hash is not needed */
929
930 if (ctx->bufcnt) {
931 return atmel_sha_enqueue(req, SHA_OP_FINAL);
932 } else if (!(ctx->flags & SHA_FLAGS_PAD)) { /* add padding */
933 err = atmel_sha_hw_init(dd);
934 if (err)
935 goto err1;
936
937 dd->flags |= SHA_FLAGS_BUSY;
938 err = atmel_sha_final_req(dd);
939 } else {
940 /* copy ready hash (+ finalize hmac) */
941 return atmel_sha_finish(req);
942 }
943
944 err1:
945 if (err != -EINPROGRESS)
946 /* done_task will not finish it, so do it here */
947 atmel_sha_finish_req(req, err);
948
949 return err;
950 }
951
952 static int atmel_sha_finup(struct ahash_request *req)
953 {
954 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
955 int err1, err2;
956
957 ctx->flags |= SHA_FLAGS_FINUP;
958
959 err1 = atmel_sha_update(req);
960 if (err1 == -EINPROGRESS || err1 == -EBUSY)
961 return err1;
962
963 /*
964 * final() has to be always called to cleanup resources
965 * even if udpate() failed, except EINPROGRESS
966 */
967 err2 = atmel_sha_final(req);
968
969 return err1 ?: err2;
970 }
971
972 static int atmel_sha_digest(struct ahash_request *req)
973 {
974 return atmel_sha_init(req) ?: atmel_sha_finup(req);
975 }
976
977 static int atmel_sha_cra_init_alg(struct crypto_tfm *tfm, const char *alg_base)
978 {
979 struct atmel_sha_ctx *tctx = crypto_tfm_ctx(tfm);
980 const char *alg_name = crypto_tfm_alg_name(tfm);
981
982 /* Allocate a fallback and abort if it failed. */
983 tctx->fallback = crypto_alloc_shash(alg_name, 0,
984 CRYPTO_ALG_NEED_FALLBACK);
985 if (IS_ERR(tctx->fallback)) {
986 pr_err("atmel-sha: fallback driver '%s' could not be loaded.\n",
987 alg_name);
988 return PTR_ERR(tctx->fallback);
989 }
990 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
991 sizeof(struct atmel_sha_reqctx) +
992 SHA_BUFFER_LEN + SHA512_BLOCK_SIZE);
993
994 return 0;
995 }
996
997 static int atmel_sha_cra_init(struct crypto_tfm *tfm)
998 {
999 return atmel_sha_cra_init_alg(tfm, NULL);
1000 }
1001
1002 static void atmel_sha_cra_exit(struct crypto_tfm *tfm)
1003 {
1004 struct atmel_sha_ctx *tctx = crypto_tfm_ctx(tfm);
1005
1006 crypto_free_shash(tctx->fallback);
1007 tctx->fallback = NULL;
1008 }
1009
1010 static struct ahash_alg sha_1_256_algs[] = {
1011 {
1012 .init = atmel_sha_init,
1013 .update = atmel_sha_update,
1014 .final = atmel_sha_final,
1015 .finup = atmel_sha_finup,
1016 .digest = atmel_sha_digest,
1017 .halg = {
1018 .digestsize = SHA1_DIGEST_SIZE,
1019 .base = {
1020 .cra_name = "sha1",
1021 .cra_driver_name = "atmel-sha1",
1022 .cra_priority = 100,
1023 .cra_flags = CRYPTO_ALG_ASYNC |
1024 CRYPTO_ALG_NEED_FALLBACK,
1025 .cra_blocksize = SHA1_BLOCK_SIZE,
1026 .cra_ctxsize = sizeof(struct atmel_sha_ctx),
1027 .cra_alignmask = 0,
1028 .cra_module = THIS_MODULE,
1029 .cra_init = atmel_sha_cra_init,
1030 .cra_exit = atmel_sha_cra_exit,
1031 }
1032 }
1033 },
1034 {
1035 .init = atmel_sha_init,
1036 .update = atmel_sha_update,
1037 .final = atmel_sha_final,
1038 .finup = atmel_sha_finup,
1039 .digest = atmel_sha_digest,
1040 .halg = {
1041 .digestsize = SHA256_DIGEST_SIZE,
1042 .base = {
1043 .cra_name = "sha256",
1044 .cra_driver_name = "atmel-sha256",
1045 .cra_priority = 100,
1046 .cra_flags = CRYPTO_ALG_ASYNC |
1047 CRYPTO_ALG_NEED_FALLBACK,
1048 .cra_blocksize = SHA256_BLOCK_SIZE,
1049 .cra_ctxsize = sizeof(struct atmel_sha_ctx),
1050 .cra_alignmask = 0,
1051 .cra_module = THIS_MODULE,
1052 .cra_init = atmel_sha_cra_init,
1053 .cra_exit = atmel_sha_cra_exit,
1054 }
1055 }
1056 },
1057 };
1058
1059 static struct ahash_alg sha_224_alg = {
1060 .init = atmel_sha_init,
1061 .update = atmel_sha_update,
1062 .final = atmel_sha_final,
1063 .finup = atmel_sha_finup,
1064 .digest = atmel_sha_digest,
1065 .halg = {
1066 .digestsize = SHA224_DIGEST_SIZE,
1067 .base = {
1068 .cra_name = "sha224",
1069 .cra_driver_name = "atmel-sha224",
1070 .cra_priority = 100,
1071 .cra_flags = CRYPTO_ALG_ASYNC |
1072 CRYPTO_ALG_NEED_FALLBACK,
1073 .cra_blocksize = SHA224_BLOCK_SIZE,
1074 .cra_ctxsize = sizeof(struct atmel_sha_ctx),
1075 .cra_alignmask = 0,
1076 .cra_module = THIS_MODULE,
1077 .cra_init = atmel_sha_cra_init,
1078 .cra_exit = atmel_sha_cra_exit,
1079 }
1080 }
1081 };
1082
1083 static struct ahash_alg sha_384_512_algs[] = {
1084 {
1085 .init = atmel_sha_init,
1086 .update = atmel_sha_update,
1087 .final = atmel_sha_final,
1088 .finup = atmel_sha_finup,
1089 .digest = atmel_sha_digest,
1090 .halg = {
1091 .digestsize = SHA384_DIGEST_SIZE,
1092 .base = {
1093 .cra_name = "sha384",
1094 .cra_driver_name = "atmel-sha384",
1095 .cra_priority = 100,
1096 .cra_flags = CRYPTO_ALG_ASYNC |
1097 CRYPTO_ALG_NEED_FALLBACK,
1098 .cra_blocksize = SHA384_BLOCK_SIZE,
1099 .cra_ctxsize = sizeof(struct atmel_sha_ctx),
1100 .cra_alignmask = 0x3,
1101 .cra_module = THIS_MODULE,
1102 .cra_init = atmel_sha_cra_init,
1103 .cra_exit = atmel_sha_cra_exit,
1104 }
1105 }
1106 },
1107 {
1108 .init = atmel_sha_init,
1109 .update = atmel_sha_update,
1110 .final = atmel_sha_final,
1111 .finup = atmel_sha_finup,
1112 .digest = atmel_sha_digest,
1113 .halg = {
1114 .digestsize = SHA512_DIGEST_SIZE,
1115 .base = {
1116 .cra_name = "sha512",
1117 .cra_driver_name = "atmel-sha512",
1118 .cra_priority = 100,
1119 .cra_flags = CRYPTO_ALG_ASYNC |
1120 CRYPTO_ALG_NEED_FALLBACK,
1121 .cra_blocksize = SHA512_BLOCK_SIZE,
1122 .cra_ctxsize = sizeof(struct atmel_sha_ctx),
1123 .cra_alignmask = 0x3,
1124 .cra_module = THIS_MODULE,
1125 .cra_init = atmel_sha_cra_init,
1126 .cra_exit = atmel_sha_cra_exit,
1127 }
1128 }
1129 },
1130 };
1131
1132 static void atmel_sha_done_task(unsigned long data)
1133 {
1134 struct atmel_sha_dev *dd = (struct atmel_sha_dev *)data;
1135 int err = 0;
1136
1137 if (!(SHA_FLAGS_BUSY & dd->flags)) {
1138 atmel_sha_handle_queue(dd, NULL);
1139 return;
1140 }
1141
1142 if (SHA_FLAGS_CPU & dd->flags) {
1143 if (SHA_FLAGS_OUTPUT_READY & dd->flags) {
1144 dd->flags &= ~SHA_FLAGS_OUTPUT_READY;
1145 goto finish;
1146 }
1147 } else if (SHA_FLAGS_DMA_READY & dd->flags) {
1148 if (SHA_FLAGS_DMA_ACTIVE & dd->flags) {
1149 dd->flags &= ~SHA_FLAGS_DMA_ACTIVE;
1150 atmel_sha_update_dma_stop(dd);
1151 if (dd->err) {
1152 err = dd->err;
1153 goto finish;
1154 }
1155 }
1156 if (SHA_FLAGS_OUTPUT_READY & dd->flags) {
1157 /* hash or semi-hash ready */
1158 dd->flags &= ~(SHA_FLAGS_DMA_READY |
1159 SHA_FLAGS_OUTPUT_READY);
1160 err = atmel_sha_update_dma_start(dd);
1161 if (err != -EINPROGRESS)
1162 goto finish;
1163 }
1164 }
1165 return;
1166
1167 finish:
1168 /* finish curent request */
1169 atmel_sha_finish_req(dd->req, err);
1170 }
1171
1172 static irqreturn_t atmel_sha_irq(int irq, void *dev_id)
1173 {
1174 struct atmel_sha_dev *sha_dd = dev_id;
1175 u32 reg;
1176
1177 reg = atmel_sha_read(sha_dd, SHA_ISR);
1178 if (reg & atmel_sha_read(sha_dd, SHA_IMR)) {
1179 atmel_sha_write(sha_dd, SHA_IDR, reg);
1180 if (SHA_FLAGS_BUSY & sha_dd->flags) {
1181 sha_dd->flags |= SHA_FLAGS_OUTPUT_READY;
1182 if (!(SHA_FLAGS_CPU & sha_dd->flags))
1183 sha_dd->flags |= SHA_FLAGS_DMA_READY;
1184 tasklet_schedule(&sha_dd->done_task);
1185 } else {
1186 dev_warn(sha_dd->dev, "SHA interrupt when no active requests.\n");
1187 }
1188 return IRQ_HANDLED;
1189 }
1190
1191 return IRQ_NONE;
1192 }
1193
1194 static void atmel_sha_unregister_algs(struct atmel_sha_dev *dd)
1195 {
1196 int i;
1197
1198 for (i = 0; i < ARRAY_SIZE(sha_1_256_algs); i++)
1199 crypto_unregister_ahash(&sha_1_256_algs[i]);
1200
1201 if (dd->caps.has_sha224)
1202 crypto_unregister_ahash(&sha_224_alg);
1203
1204 if (dd->caps.has_sha_384_512) {
1205 for (i = 0; i < ARRAY_SIZE(sha_384_512_algs); i++)
1206 crypto_unregister_ahash(&sha_384_512_algs[i]);
1207 }
1208 }
1209
1210 static int atmel_sha_register_algs(struct atmel_sha_dev *dd)
1211 {
1212 int err, i, j;
1213
1214 for (i = 0; i < ARRAY_SIZE(sha_1_256_algs); i++) {
1215 err = crypto_register_ahash(&sha_1_256_algs[i]);
1216 if (err)
1217 goto err_sha_1_256_algs;
1218 }
1219
1220 if (dd->caps.has_sha224) {
1221 err = crypto_register_ahash(&sha_224_alg);
1222 if (err)
1223 goto err_sha_224_algs;
1224 }
1225
1226 if (dd->caps.has_sha_384_512) {
1227 for (i = 0; i < ARRAY_SIZE(sha_384_512_algs); i++) {
1228 err = crypto_register_ahash(&sha_384_512_algs[i]);
1229 if (err)
1230 goto err_sha_384_512_algs;
1231 }
1232 }
1233
1234 return 0;
1235
1236 err_sha_384_512_algs:
1237 for (j = 0; j < i; j++)
1238 crypto_unregister_ahash(&sha_384_512_algs[j]);
1239 crypto_unregister_ahash(&sha_224_alg);
1240 err_sha_224_algs:
1241 i = ARRAY_SIZE(sha_1_256_algs);
1242 err_sha_1_256_algs:
1243 for (j = 0; j < i; j++)
1244 crypto_unregister_ahash(&sha_1_256_algs[j]);
1245
1246 return err;
1247 }
1248
1249 static bool atmel_sha_filter(struct dma_chan *chan, void *slave)
1250 {
1251 struct at_dma_slave *sl = slave;
1252
1253 if (sl && sl->dma_dev == chan->device->dev) {
1254 chan->private = sl;
1255 return true;
1256 } else {
1257 return false;
1258 }
1259 }
1260
1261 static int atmel_sha_dma_init(struct atmel_sha_dev *dd,
1262 struct crypto_platform_data *pdata)
1263 {
1264 int err = -ENOMEM;
1265 dma_cap_mask_t mask_in;
1266
1267 /* Try to grab DMA channel */
1268 dma_cap_zero(mask_in);
1269 dma_cap_set(DMA_SLAVE, mask_in);
1270
1271 dd->dma_lch_in.chan = dma_request_slave_channel_compat(mask_in,
1272 atmel_sha_filter, &pdata->dma_slave->rxdata, dd->dev, "tx");
1273 if (!dd->dma_lch_in.chan) {
1274 dev_warn(dd->dev, "no DMA channel available\n");
1275 return err;
1276 }
1277
1278 dd->dma_lch_in.dma_conf.direction = DMA_MEM_TO_DEV;
1279 dd->dma_lch_in.dma_conf.dst_addr = dd->phys_base +
1280 SHA_REG_DIN(0);
1281 dd->dma_lch_in.dma_conf.src_maxburst = 1;
1282 dd->dma_lch_in.dma_conf.src_addr_width =
1283 DMA_SLAVE_BUSWIDTH_4_BYTES;
1284 dd->dma_lch_in.dma_conf.dst_maxburst = 1;
1285 dd->dma_lch_in.dma_conf.dst_addr_width =
1286 DMA_SLAVE_BUSWIDTH_4_BYTES;
1287 dd->dma_lch_in.dma_conf.device_fc = false;
1288
1289 return 0;
1290 }
1291
1292 static void atmel_sha_dma_cleanup(struct atmel_sha_dev *dd)
1293 {
1294 dma_release_channel(dd->dma_lch_in.chan);
1295 }
1296
1297 static void atmel_sha_get_cap(struct atmel_sha_dev *dd)
1298 {
1299
1300 dd->caps.has_dma = 0;
1301 dd->caps.has_dualbuff = 0;
1302 dd->caps.has_sha224 = 0;
1303 dd->caps.has_sha_384_512 = 0;
1304
1305 /* keep only major version number */
1306 switch (dd->hw_version & 0xff0) {
1307 case 0x410:
1308 dd->caps.has_dma = 1;
1309 dd->caps.has_dualbuff = 1;
1310 dd->caps.has_sha224 = 1;
1311 dd->caps.has_sha_384_512 = 1;
1312 break;
1313 case 0x400:
1314 dd->caps.has_dma = 1;
1315 dd->caps.has_dualbuff = 1;
1316 dd->caps.has_sha224 = 1;
1317 break;
1318 case 0x320:
1319 break;
1320 default:
1321 dev_warn(dd->dev,
1322 "Unmanaged sha version, set minimum capabilities\n");
1323 break;
1324 }
1325 }
1326
1327 #if defined(CONFIG_OF)
1328 static const struct of_device_id atmel_sha_dt_ids[] = {
1329 { .compatible = "atmel,at91sam9g46-sha" },
1330 { /* sentinel */ }
1331 };
1332
1333 MODULE_DEVICE_TABLE(of, atmel_sha_dt_ids);
1334
1335 static struct crypto_platform_data *atmel_sha_of_init(struct platform_device *pdev)
1336 {
1337 struct device_node *np = pdev->dev.of_node;
1338 struct crypto_platform_data *pdata;
1339
1340 if (!np) {
1341 dev_err(&pdev->dev, "device node not found\n");
1342 return ERR_PTR(-EINVAL);
1343 }
1344
1345 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
1346 if (!pdata) {
1347 dev_err(&pdev->dev, "could not allocate memory for pdata\n");
1348 return ERR_PTR(-ENOMEM);
1349 }
1350
1351 pdata->dma_slave = devm_kzalloc(&pdev->dev,
1352 sizeof(*(pdata->dma_slave)),
1353 GFP_KERNEL);
1354 if (!pdata->dma_slave) {
1355 dev_err(&pdev->dev, "could not allocate memory for dma_slave\n");
1356 devm_kfree(&pdev->dev, pdata);
1357 return ERR_PTR(-ENOMEM);
1358 }
1359
1360 return pdata;
1361 }
1362 #else /* CONFIG_OF */
1363 static inline struct crypto_platform_data *atmel_sha_of_init(struct platform_device *dev)
1364 {
1365 return ERR_PTR(-EINVAL);
1366 }
1367 #endif
1368
1369 static int atmel_sha_probe(struct platform_device *pdev)
1370 {
1371 struct atmel_sha_dev *sha_dd;
1372 struct crypto_platform_data *pdata;
1373 struct device *dev = &pdev->dev;
1374 struct resource *sha_res;
1375 unsigned long sha_phys_size;
1376 int err;
1377
1378 sha_dd = kzalloc(sizeof(struct atmel_sha_dev), GFP_KERNEL);
1379 if (sha_dd == NULL) {
1380 dev_err(dev, "unable to alloc data struct.\n");
1381 err = -ENOMEM;
1382 goto sha_dd_err;
1383 }
1384
1385 sha_dd->dev = dev;
1386
1387 platform_set_drvdata(pdev, sha_dd);
1388
1389 INIT_LIST_HEAD(&sha_dd->list);
1390
1391 tasklet_init(&sha_dd->done_task, atmel_sha_done_task,
1392 (unsigned long)sha_dd);
1393
1394 crypto_init_queue(&sha_dd->queue, ATMEL_SHA_QUEUE_LENGTH);
1395
1396 sha_dd->irq = -1;
1397
1398 /* Get the base address */
1399 sha_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1400 if (!sha_res) {
1401 dev_err(dev, "no MEM resource info\n");
1402 err = -ENODEV;
1403 goto res_err;
1404 }
1405 sha_dd->phys_base = sha_res->start;
1406 sha_phys_size = resource_size(sha_res);
1407
1408 /* Get the IRQ */
1409 sha_dd->irq = platform_get_irq(pdev, 0);
1410 if (sha_dd->irq < 0) {
1411 dev_err(dev, "no IRQ resource info\n");
1412 err = sha_dd->irq;
1413 goto res_err;
1414 }
1415
1416 err = request_irq(sha_dd->irq, atmel_sha_irq, IRQF_SHARED, "atmel-sha",
1417 sha_dd);
1418 if (err) {
1419 dev_err(dev, "unable to request sha irq.\n");
1420 goto res_err;
1421 }
1422
1423 /* Initializing the clock */
1424 sha_dd->iclk = clk_get(&pdev->dev, "sha_clk");
1425 if (IS_ERR(sha_dd->iclk)) {
1426 dev_err(dev, "clock intialization failed.\n");
1427 err = PTR_ERR(sha_dd->iclk);
1428 goto clk_err;
1429 }
1430
1431 sha_dd->io_base = ioremap(sha_dd->phys_base, sha_phys_size);
1432 if (!sha_dd->io_base) {
1433 dev_err(dev, "can't ioremap\n");
1434 err = -ENOMEM;
1435 goto sha_io_err;
1436 }
1437
1438 atmel_sha_hw_version_init(sha_dd);
1439
1440 atmel_sha_get_cap(sha_dd);
1441
1442 if (sha_dd->caps.has_dma) {
1443 pdata = pdev->dev.platform_data;
1444 if (!pdata) {
1445 pdata = atmel_sha_of_init(pdev);
1446 if (IS_ERR(pdata)) {
1447 dev_err(&pdev->dev, "platform data not available\n");
1448 err = PTR_ERR(pdata);
1449 goto err_pdata;
1450 }
1451 }
1452 if (!pdata->dma_slave) {
1453 err = -ENXIO;
1454 goto err_pdata;
1455 }
1456 err = atmel_sha_dma_init(sha_dd, pdata);
1457 if (err)
1458 goto err_sha_dma;
1459
1460 dev_info(dev, "using %s for DMA transfers\n",
1461 dma_chan_name(sha_dd->dma_lch_in.chan));
1462 }
1463
1464 spin_lock(&atmel_sha.lock);
1465 list_add_tail(&sha_dd->list, &atmel_sha.dev_list);
1466 spin_unlock(&atmel_sha.lock);
1467
1468 err = atmel_sha_register_algs(sha_dd);
1469 if (err)
1470 goto err_algs;
1471
1472 dev_info(dev, "Atmel SHA1/SHA256%s%s\n",
1473 sha_dd->caps.has_sha224 ? "/SHA224" : "",
1474 sha_dd->caps.has_sha_384_512 ? "/SHA384/SHA512" : "");
1475
1476 return 0;
1477
1478 err_algs:
1479 spin_lock(&atmel_sha.lock);
1480 list_del(&sha_dd->list);
1481 spin_unlock(&atmel_sha.lock);
1482 if (sha_dd->caps.has_dma)
1483 atmel_sha_dma_cleanup(sha_dd);
1484 err_sha_dma:
1485 err_pdata:
1486 iounmap(sha_dd->io_base);
1487 sha_io_err:
1488 clk_put(sha_dd->iclk);
1489 clk_err:
1490 free_irq(sha_dd->irq, sha_dd);
1491 res_err:
1492 tasklet_kill(&sha_dd->done_task);
1493 kfree(sha_dd);
1494 sha_dd = NULL;
1495 sha_dd_err:
1496 dev_err(dev, "initialization failed.\n");
1497
1498 return err;
1499 }
1500
1501 static int atmel_sha_remove(struct platform_device *pdev)
1502 {
1503 static struct atmel_sha_dev *sha_dd;
1504
1505 sha_dd = platform_get_drvdata(pdev);
1506 if (!sha_dd)
1507 return -ENODEV;
1508 spin_lock(&atmel_sha.lock);
1509 list_del(&sha_dd->list);
1510 spin_unlock(&atmel_sha.lock);
1511
1512 atmel_sha_unregister_algs(sha_dd);
1513
1514 tasklet_kill(&sha_dd->done_task);
1515
1516 if (sha_dd->caps.has_dma)
1517 atmel_sha_dma_cleanup(sha_dd);
1518
1519 iounmap(sha_dd->io_base);
1520
1521 clk_put(sha_dd->iclk);
1522
1523 if (sha_dd->irq >= 0)
1524 free_irq(sha_dd->irq, sha_dd);
1525
1526 kfree(sha_dd);
1527 sha_dd = NULL;
1528
1529 return 0;
1530 }
1531
1532 static struct platform_driver atmel_sha_driver = {
1533 .probe = atmel_sha_probe,
1534 .remove = atmel_sha_remove,
1535 .driver = {
1536 .name = "atmel_sha",
1537 .owner = THIS_MODULE,
1538 .of_match_table = of_match_ptr(atmel_sha_dt_ids),
1539 },
1540 };
1541
1542 module_platform_driver(atmel_sha_driver);
1543
1544 MODULE_DESCRIPTION("Atmel SHA (1/256/224/384/512) hw acceleration support.");
1545 MODULE_LICENSE("GPL v2");
1546 MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
Linux with added FPC-III support