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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Cryptographic API.
4 *
5 * Support for ATMEL SHA1/SHA256 HW acceleration.
6 *
7 * Copyright (c) 2012 Eukréa Electromatique - ATMEL
8 * Author: Nicolas Royer <nicolas@eukrea.com>
9 *
10 * Some ideas are from omap-sham.c drivers.
11 */
12
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/err.h>
18#include <linux/clk.h>
19#include <linux/io.h>
20#include <linux/hw_random.h>
21#include <linux/platform_device.h>
22
23#include <linux/device.h>
24#include <linux/dmaengine.h>
25#include <linux/init.h>
26#include <linux/errno.h>
27#include <linux/interrupt.h>
28#include <linux/irq.h>
29#include <linux/scatterlist.h>
30#include <linux/dma-mapping.h>
31#include <linux/mod_devicetable.h>
32#include <linux/delay.h>
33#include <linux/crypto.h>
34#include <crypto/scatterwalk.h>
35#include <crypto/algapi.h>
36#include <crypto/sha1.h>
37#include <crypto/sha2.h>
38#include <crypto/hash.h>
39#include <crypto/internal/hash.h>
40#include "atmel-sha-regs.h"
41#include "atmel-authenc.h"
42
43#define ATMEL_SHA_PRIORITY 300
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#define SHA_FLAGS_DUMP_REG BIT(7)
54
55/* bits[11:8] are reserved. */
56
57#define SHA_FLAGS_FINUP BIT(16)
58#define SHA_FLAGS_SG BIT(17)
59#define SHA_FLAGS_ERROR BIT(23)
60#define SHA_FLAGS_PAD BIT(24)
61#define SHA_FLAGS_RESTORE BIT(25)
62#define SHA_FLAGS_IDATAR0 BIT(26)
63#define SHA_FLAGS_WAIT_DATARDY BIT(27)
64
65#define SHA_OP_INIT 0
66#define SHA_OP_UPDATE 1
67#define SHA_OP_FINAL 2
68#define SHA_OP_DIGEST 3
69
70#define SHA_BUFFER_LEN (PAGE_SIZE / 16)
71
72#define ATMEL_SHA_DMA_THRESHOLD 56
73
74struct atmel_sha_caps {
75 bool has_dma;
76 bool has_dualbuff;
77 bool has_sha224;
78 bool has_sha_384_512;
79 bool has_uihv;
80 bool has_hmac;
81};
82
83struct atmel_sha_dev;
84
85/*
86 * .statesize = sizeof(struct atmel_sha_reqctx) must be <= PAGE_SIZE / 8 as
87 * tested by the ahash_prepare_alg() function.
88 */
89struct atmel_sha_reqctx {
90 struct atmel_sha_dev *dd;
91 unsigned long flags;
92 unsigned long op;
93
94 u8 digest[SHA512_DIGEST_SIZE] __aligned(sizeof(u32));
95 u64 digcnt[2];
96 size_t bufcnt;
97 size_t buflen;
98 dma_addr_t dma_addr;
99
100 /* walk state */
101 struct scatterlist *sg;
102 unsigned int offset; /* offset in current sg */
103 unsigned int total; /* total request */
104
105 size_t block_size;
106 size_t hash_size;
107
108 u8 buffer[SHA_BUFFER_LEN + SHA512_BLOCK_SIZE] __aligned(sizeof(u32));
109};
110
111typedef int (*atmel_sha_fn_t)(struct atmel_sha_dev *);
112
113struct atmel_sha_ctx {
114 struct atmel_sha_dev *dd;
115 atmel_sha_fn_t start;
116
117 unsigned long flags;
118};
119
120#define ATMEL_SHA_QUEUE_LENGTH 50
121
122struct atmel_sha_dma {
123 struct dma_chan *chan;
124 struct dma_slave_config dma_conf;
125 struct scatterlist *sg;
126 int nents;
127 unsigned int last_sg_length;
128};
129
130struct atmel_sha_dev {
131 struct list_head list;
132 unsigned long phys_base;
133 struct device *dev;
134 struct clk *iclk;
135 int irq;
136 void __iomem *io_base;
137
138 spinlock_t lock;
139 struct tasklet_struct done_task;
140 struct tasklet_struct queue_task;
141
142 unsigned long flags;
143 struct crypto_queue queue;
144 struct ahash_request *req;
145 bool is_async;
146 bool force_complete;
147 atmel_sha_fn_t resume;
148 atmel_sha_fn_t cpu_transfer_complete;
149
150 struct atmel_sha_dma dma_lch_in;
151
152 struct atmel_sha_caps caps;
153
154 struct scatterlist tmp;
155
156 u32 hw_version;
157};
158
159struct atmel_sha_drv {
160 struct list_head dev_list;
161 spinlock_t lock;
162};
163
164static struct atmel_sha_drv atmel_sha = {
165 .dev_list = LIST_HEAD_INIT(atmel_sha.dev_list),
166 .lock = __SPIN_LOCK_UNLOCKED(atmel_sha.lock),
167};
168
169#ifdef VERBOSE_DEBUG
170static const char *atmel_sha_reg_name(u32 offset, char *tmp, size_t sz, bool wr)
171{
172 switch (offset) {
173 case SHA_CR:
174 return "CR";
175
176 case SHA_MR:
177 return "MR";
178
179 case SHA_IER:
180 return "IER";
181
182 case SHA_IDR:
183 return "IDR";
184
185 case SHA_IMR:
186 return "IMR";
187
188 case SHA_ISR:
189 return "ISR";
190
191 case SHA_MSR:
192 return "MSR";
193
194 case SHA_BCR:
195 return "BCR";
196
197 case SHA_REG_DIN(0):
198 case SHA_REG_DIN(1):
199 case SHA_REG_DIN(2):
200 case SHA_REG_DIN(3):
201 case SHA_REG_DIN(4):
202 case SHA_REG_DIN(5):
203 case SHA_REG_DIN(6):
204 case SHA_REG_DIN(7):
205 case SHA_REG_DIN(8):
206 case SHA_REG_DIN(9):
207 case SHA_REG_DIN(10):
208 case SHA_REG_DIN(11):
209 case SHA_REG_DIN(12):
210 case SHA_REG_DIN(13):
211 case SHA_REG_DIN(14):
212 case SHA_REG_DIN(15):
213 snprintf(tmp, sz, "IDATAR[%u]", (offset - SHA_REG_DIN(0)) >> 2);
214 break;
215
216 case SHA_REG_DIGEST(0):
217 case SHA_REG_DIGEST(1):
218 case SHA_REG_DIGEST(2):
219 case SHA_REG_DIGEST(3):
220 case SHA_REG_DIGEST(4):
221 case SHA_REG_DIGEST(5):
222 case SHA_REG_DIGEST(6):
223 case SHA_REG_DIGEST(7):
224 case SHA_REG_DIGEST(8):
225 case SHA_REG_DIGEST(9):
226 case SHA_REG_DIGEST(10):
227 case SHA_REG_DIGEST(11):
228 case SHA_REG_DIGEST(12):
229 case SHA_REG_DIGEST(13):
230 case SHA_REG_DIGEST(14):
231 case SHA_REG_DIGEST(15):
232 if (wr)
233 snprintf(tmp, sz, "IDATAR[%u]",
234 16u + ((offset - SHA_REG_DIGEST(0)) >> 2));
235 else
236 snprintf(tmp, sz, "ODATAR[%u]",
237 (offset - SHA_REG_DIGEST(0)) >> 2);
238 break;
239
240 case SHA_HW_VERSION:
241 return "HWVER";
242
243 default:
244 snprintf(tmp, sz, "0x%02x", offset);
245 break;
246 }
247
248 return tmp;
249}
250
251#endif /* VERBOSE_DEBUG */
252
253static inline u32 atmel_sha_read(struct atmel_sha_dev *dd, u32 offset)
254{
255 u32 value = readl_relaxed(dd->io_base + offset);
256
257#ifdef VERBOSE_DEBUG
258 if (dd->flags & SHA_FLAGS_DUMP_REG) {
259 char tmp[16];
260
261 dev_vdbg(dd->dev, "read 0x%08x from %s\n", value,
262 atmel_sha_reg_name(offset, tmp, sizeof(tmp), false));
263 }
264#endif /* VERBOSE_DEBUG */
265
266 return value;
267}
268
269static inline void atmel_sha_write(struct atmel_sha_dev *dd,
270 u32 offset, u32 value)
271{
272#ifdef VERBOSE_DEBUG
273 if (dd->flags & SHA_FLAGS_DUMP_REG) {
274 char tmp[16];
275
276 dev_vdbg(dd->dev, "write 0x%08x into %s\n", value,
277 atmel_sha_reg_name(offset, tmp, sizeof(tmp), true));
278 }
279#endif /* VERBOSE_DEBUG */
280
281 writel_relaxed(value, dd->io_base + offset);
282}
283
284static inline int atmel_sha_complete(struct atmel_sha_dev *dd, int err)
285{
286 struct ahash_request *req = dd->req;
287
288 dd->flags &= ~(SHA_FLAGS_BUSY | SHA_FLAGS_FINAL | SHA_FLAGS_CPU |
289 SHA_FLAGS_DMA_READY | SHA_FLAGS_OUTPUT_READY |
290 SHA_FLAGS_DUMP_REG);
291
292 clk_disable(dd->iclk);
293
294 if ((dd->is_async || dd->force_complete) && req->base.complete)
295 ahash_request_complete(req, err);
296
297 /* handle new request */
298 tasklet_schedule(&dd->queue_task);
299
300 return err;
301}
302
303static size_t atmel_sha_append_sg(struct atmel_sha_reqctx *ctx)
304{
305 size_t count;
306
307 while ((ctx->bufcnt < ctx->buflen) && ctx->total) {
308 count = min(ctx->sg->length - ctx->offset, ctx->total);
309 count = min(count, ctx->buflen - ctx->bufcnt);
310
311 if (count <= 0) {
312 /*
313 * Check if count <= 0 because the buffer is full or
314 * because the sg length is 0. In the latest case,
315 * check if there is another sg in the list, a 0 length
316 * sg doesn't necessarily mean the end of the sg list.
317 */
318 if ((ctx->sg->length == 0) && !sg_is_last(ctx->sg)) {
319 ctx->sg = sg_next(ctx->sg);
320 continue;
321 } else {
322 break;
323 }
324 }
325
326 scatterwalk_map_and_copy(ctx->buffer + ctx->bufcnt, ctx->sg,
327 ctx->offset, count, 0);
328
329 ctx->bufcnt += count;
330 ctx->offset += count;
331 ctx->total -= count;
332
333 if (ctx->offset == ctx->sg->length) {
334 ctx->sg = sg_next(ctx->sg);
335 if (ctx->sg)
336 ctx->offset = 0;
337 else
338 ctx->total = 0;
339 }
340 }
341
342 return 0;
343}
344
345/*
346 * The purpose of this padding is to ensure that the padded message is a
347 * multiple of 512 bits (SHA1/SHA224/SHA256) or 1024 bits (SHA384/SHA512).
348 * The bit "1" is appended at the end of the message followed by
349 * "padlen-1" zero bits. Then a 64 bits block (SHA1/SHA224/SHA256) or
350 * 128 bits block (SHA384/SHA512) equals to the message length in bits
351 * is appended.
352 *
353 * For SHA1/SHA224/SHA256, padlen is calculated as followed:
354 * - if message length < 56 bytes then padlen = 56 - message length
355 * - else padlen = 64 + 56 - message length
356 *
357 * For SHA384/SHA512, padlen is calculated as followed:
358 * - if message length < 112 bytes then padlen = 112 - message length
359 * - else padlen = 128 + 112 - message length
360 */
361static void atmel_sha_fill_padding(struct atmel_sha_reqctx *ctx, int length)
362{
363 unsigned int index, padlen;
364 __be64 bits[2];
365 u64 size[2];
366
367 size[0] = ctx->digcnt[0];
368 size[1] = ctx->digcnt[1];
369
370 size[0] += ctx->bufcnt;
371 if (size[0] < ctx->bufcnt)
372 size[1]++;
373
374 size[0] += length;
375 if (size[0] < length)
376 size[1]++;
377
378 bits[1] = cpu_to_be64(size[0] << 3);
379 bits[0] = cpu_to_be64(size[1] << 3 | size[0] >> 61);
380
381 switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
382 case SHA_FLAGS_SHA384:
383 case SHA_FLAGS_SHA512:
384 index = ctx->bufcnt & 0x7f;
385 padlen = (index < 112) ? (112 - index) : ((128+112) - index);
386 *(ctx->buffer + ctx->bufcnt) = 0x80;
387 memset(ctx->buffer + ctx->bufcnt + 1, 0, padlen-1);
388 memcpy(ctx->buffer + ctx->bufcnt + padlen, bits, 16);
389 ctx->bufcnt += padlen + 16;
390 ctx->flags |= SHA_FLAGS_PAD;
391 break;
392
393 default:
394 index = ctx->bufcnt & 0x3f;
395 padlen = (index < 56) ? (56 - index) : ((64+56) - index);
396 *(ctx->buffer + ctx->bufcnt) = 0x80;
397 memset(ctx->buffer + ctx->bufcnt + 1, 0, padlen-1);
398 memcpy(ctx->buffer + ctx->bufcnt + padlen, &bits[1], 8);
399 ctx->bufcnt += padlen + 8;
400 ctx->flags |= SHA_FLAGS_PAD;
401 break;
402 }
403}
404
405static struct atmel_sha_dev *atmel_sha_find_dev(struct atmel_sha_ctx *tctx)
406{
407 struct atmel_sha_dev *dd = NULL;
408 struct atmel_sha_dev *tmp;
409
410 spin_lock_bh(&atmel_sha.lock);
411 if (!tctx->dd) {
412 list_for_each_entry(tmp, &atmel_sha.dev_list, list) {
413 dd = tmp;
414 break;
415 }
416 tctx->dd = dd;
417 } else {
418 dd = tctx->dd;
419 }
420
421 spin_unlock_bh(&atmel_sha.lock);
422
423 return dd;
424}
425
426static int atmel_sha_init(struct ahash_request *req)
427{
428 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
429 struct atmel_sha_ctx *tctx = crypto_ahash_ctx(tfm);
430 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
431 struct atmel_sha_dev *dd = atmel_sha_find_dev(tctx);
432
433 ctx->dd = dd;
434
435 ctx->flags = 0;
436
437 dev_dbg(dd->dev, "init: digest size: %u\n",
438 crypto_ahash_digestsize(tfm));
439
440 switch (crypto_ahash_digestsize(tfm)) {
441 case SHA1_DIGEST_SIZE:
442 ctx->flags |= SHA_FLAGS_SHA1;
443 ctx->block_size = SHA1_BLOCK_SIZE;
444 break;
445 case SHA224_DIGEST_SIZE:
446 ctx->flags |= SHA_FLAGS_SHA224;
447 ctx->block_size = SHA224_BLOCK_SIZE;
448 break;
449 case SHA256_DIGEST_SIZE:
450 ctx->flags |= SHA_FLAGS_SHA256;
451 ctx->block_size = SHA256_BLOCK_SIZE;
452 break;
453 case SHA384_DIGEST_SIZE:
454 ctx->flags |= SHA_FLAGS_SHA384;
455 ctx->block_size = SHA384_BLOCK_SIZE;
456 break;
457 case SHA512_DIGEST_SIZE:
458 ctx->flags |= SHA_FLAGS_SHA512;
459 ctx->block_size = SHA512_BLOCK_SIZE;
460 break;
461 default:
462 return -EINVAL;
463 }
464
465 ctx->bufcnt = 0;
466 ctx->digcnt[0] = 0;
467 ctx->digcnt[1] = 0;
468 ctx->buflen = SHA_BUFFER_LEN;
469
470 return 0;
471}
472
473static void atmel_sha_write_ctrl(struct atmel_sha_dev *dd, int dma)
474{
475 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
476 u32 valmr = SHA_MR_MODE_AUTO;
477 unsigned int i, hashsize = 0;
478
479 if (likely(dma)) {
480 if (!dd->caps.has_dma)
481 atmel_sha_write(dd, SHA_IER, SHA_INT_TXBUFE);
482 valmr = SHA_MR_MODE_PDC;
483 if (dd->caps.has_dualbuff)
484 valmr |= SHA_MR_DUALBUFF;
485 } else {
486 atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
487 }
488
489 switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
490 case SHA_FLAGS_SHA1:
491 valmr |= SHA_MR_ALGO_SHA1;
492 hashsize = SHA1_DIGEST_SIZE;
493 break;
494
495 case SHA_FLAGS_SHA224:
496 valmr |= SHA_MR_ALGO_SHA224;
497 hashsize = SHA256_DIGEST_SIZE;
498 break;
499
500 case SHA_FLAGS_SHA256:
501 valmr |= SHA_MR_ALGO_SHA256;
502 hashsize = SHA256_DIGEST_SIZE;
503 break;
504
505 case SHA_FLAGS_SHA384:
506 valmr |= SHA_MR_ALGO_SHA384;
507 hashsize = SHA512_DIGEST_SIZE;
508 break;
509
510 case SHA_FLAGS_SHA512:
511 valmr |= SHA_MR_ALGO_SHA512;
512 hashsize = SHA512_DIGEST_SIZE;
513 break;
514
515 default:
516 break;
517 }
518
519 /* Setting CR_FIRST only for the first iteration */
520 if (!(ctx->digcnt[0] || ctx->digcnt[1])) {
521 atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
522 } else if (dd->caps.has_uihv && (ctx->flags & SHA_FLAGS_RESTORE)) {
523 const u32 *hash = (const u32 *)ctx->digest;
524
525 /*
526 * Restore the hardware context: update the User Initialize
527 * Hash Value (UIHV) with the value saved when the latest
528 * 'update' operation completed on this very same crypto
529 * request.
530 */
531 ctx->flags &= ~SHA_FLAGS_RESTORE;
532 atmel_sha_write(dd, SHA_CR, SHA_CR_WUIHV);
533 for (i = 0; i < hashsize / sizeof(u32); ++i)
534 atmel_sha_write(dd, SHA_REG_DIN(i), hash[i]);
535 atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
536 valmr |= SHA_MR_UIHV;
537 }
538 /*
539 * WARNING: If the UIHV feature is not available, the hardware CANNOT
540 * process concurrent requests: the internal registers used to store
541 * the hash/digest are still set to the partial digest output values
542 * computed during the latest round.
543 */
544
545 atmel_sha_write(dd, SHA_MR, valmr);
546}
547
548static inline int atmel_sha_wait_for_data_ready(struct atmel_sha_dev *dd,
549 atmel_sha_fn_t resume)
550{
551 u32 isr = atmel_sha_read(dd, SHA_ISR);
552
553 if (unlikely(isr & SHA_INT_DATARDY))
554 return resume(dd);
555
556 dd->resume = resume;
557 atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
558 return -EINPROGRESS;
559}
560
561static int atmel_sha_xmit_cpu(struct atmel_sha_dev *dd, const u8 *buf,
562 size_t length, int final)
563{
564 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
565 int count, len32;
566 const u32 *buffer = (const u32 *)buf;
567
568 dev_dbg(dd->dev, "xmit_cpu: digcnt: 0x%llx 0x%llx, length: %zd, final: %d\n",
569 ctx->digcnt[1], ctx->digcnt[0], length, final);
570
571 atmel_sha_write_ctrl(dd, 0);
572
573 /* should be non-zero before next lines to disable clocks later */
574 ctx->digcnt[0] += length;
575 if (ctx->digcnt[0] < length)
576 ctx->digcnt[1]++;
577
578 if (final)
579 dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */
580
581 len32 = DIV_ROUND_UP(length, sizeof(u32));
582
583 dd->flags |= SHA_FLAGS_CPU;
584
585 for (count = 0; count < len32; count++)
586 atmel_sha_write(dd, SHA_REG_DIN(count), buffer[count]);
587
588 return -EINPROGRESS;
589}
590
591static int atmel_sha_xmit_pdc(struct atmel_sha_dev *dd, dma_addr_t dma_addr1,
592 size_t length1, dma_addr_t dma_addr2, size_t length2, int final)
593{
594 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
595 int len32;
596
597 dev_dbg(dd->dev, "xmit_pdc: digcnt: 0x%llx 0x%llx, length: %zd, final: %d\n",
598 ctx->digcnt[1], ctx->digcnt[0], length1, final);
599
600 len32 = DIV_ROUND_UP(length1, sizeof(u32));
601 atmel_sha_write(dd, SHA_PTCR, SHA_PTCR_TXTDIS);
602 atmel_sha_write(dd, SHA_TPR, dma_addr1);
603 atmel_sha_write(dd, SHA_TCR, len32);
604
605 len32 = DIV_ROUND_UP(length2, sizeof(u32));
606 atmel_sha_write(dd, SHA_TNPR, dma_addr2);
607 atmel_sha_write(dd, SHA_TNCR, len32);
608
609 atmel_sha_write_ctrl(dd, 1);
610
611 /* should be non-zero before next lines to disable clocks later */
612 ctx->digcnt[0] += length1;
613 if (ctx->digcnt[0] < length1)
614 ctx->digcnt[1]++;
615
616 if (final)
617 dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */
618
619 dd->flags |= SHA_FLAGS_DMA_ACTIVE;
620
621 /* Start DMA transfer */
622 atmel_sha_write(dd, SHA_PTCR, SHA_PTCR_TXTEN);
623
624 return -EINPROGRESS;
625}
626
627static void atmel_sha_dma_callback(void *data)
628{
629 struct atmel_sha_dev *dd = data;
630
631 dd->is_async = true;
632
633 /* dma_lch_in - completed - wait DATRDY */
634 atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
635}
636
637static int atmel_sha_xmit_dma(struct atmel_sha_dev *dd, dma_addr_t dma_addr1,
638 size_t length1, dma_addr_t dma_addr2, size_t length2, int final)
639{
640 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
641 struct dma_async_tx_descriptor *in_desc;
642 struct scatterlist sg[2];
643
644 dev_dbg(dd->dev, "xmit_dma: digcnt: 0x%llx 0x%llx, length: %zd, final: %d\n",
645 ctx->digcnt[1], ctx->digcnt[0], length1, final);
646
647 dd->dma_lch_in.dma_conf.src_maxburst = 16;
648 dd->dma_lch_in.dma_conf.dst_maxburst = 16;
649
650 dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf);
651
652 if (length2) {
653 sg_init_table(sg, 2);
654 sg_dma_address(&sg[0]) = dma_addr1;
655 sg_dma_len(&sg[0]) = length1;
656 sg_dma_address(&sg[1]) = dma_addr2;
657 sg_dma_len(&sg[1]) = length2;
658 in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, sg, 2,
659 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
660 } else {
661 sg_init_table(sg, 1);
662 sg_dma_address(&sg[0]) = dma_addr1;
663 sg_dma_len(&sg[0]) = length1;
664 in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, sg, 1,
665 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
666 }
667 if (!in_desc)
668 return atmel_sha_complete(dd, -EINVAL);
669
670 in_desc->callback = atmel_sha_dma_callback;
671 in_desc->callback_param = dd;
672
673 atmel_sha_write_ctrl(dd, 1);
674
675 /* should be non-zero before next lines to disable clocks later */
676 ctx->digcnt[0] += length1;
677 if (ctx->digcnt[0] < length1)
678 ctx->digcnt[1]++;
679
680 if (final)
681 dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */
682
683 dd->flags |= SHA_FLAGS_DMA_ACTIVE;
684
685 /* Start DMA transfer */
686 dmaengine_submit(in_desc);
687 dma_async_issue_pending(dd->dma_lch_in.chan);
688
689 return -EINPROGRESS;
690}
691
692static int atmel_sha_xmit_start(struct atmel_sha_dev *dd, dma_addr_t dma_addr1,
693 size_t length1, dma_addr_t dma_addr2, size_t length2, int final)
694{
695 if (dd->caps.has_dma)
696 return atmel_sha_xmit_dma(dd, dma_addr1, length1,
697 dma_addr2, length2, final);
698 else
699 return atmel_sha_xmit_pdc(dd, dma_addr1, length1,
700 dma_addr2, length2, final);
701}
702
703static int atmel_sha_update_cpu(struct atmel_sha_dev *dd)
704{
705 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
706 int bufcnt;
707
708 atmel_sha_append_sg(ctx);
709 atmel_sha_fill_padding(ctx, 0);
710 bufcnt = ctx->bufcnt;
711 ctx->bufcnt = 0;
712
713 return atmel_sha_xmit_cpu(dd, ctx->buffer, bufcnt, 1);
714}
715
716static int atmel_sha_xmit_dma_map(struct atmel_sha_dev *dd,
717 struct atmel_sha_reqctx *ctx,
718 size_t length, int final)
719{
720 ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer,
721 ctx->buflen + ctx->block_size, DMA_TO_DEVICE);
722 if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
723 dev_err(dd->dev, "dma %zu bytes error\n", ctx->buflen +
724 ctx->block_size);
725 return atmel_sha_complete(dd, -EINVAL);
726 }
727
728 ctx->flags &= ~SHA_FLAGS_SG;
729
730 /* next call does not fail... so no unmap in the case of error */
731 return atmel_sha_xmit_start(dd, ctx->dma_addr, length, 0, 0, final);
732}
733
734static int atmel_sha_update_dma_slow(struct atmel_sha_dev *dd)
735{
736 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
737 unsigned int final;
738 size_t count;
739
740 atmel_sha_append_sg(ctx);
741
742 final = (ctx->flags & SHA_FLAGS_FINUP) && !ctx->total;
743
744 dev_dbg(dd->dev, "slow: bufcnt: %zu, digcnt: 0x%llx 0x%llx, final: %d\n",
745 ctx->bufcnt, ctx->digcnt[1], ctx->digcnt[0], final);
746
747 if (final)
748 atmel_sha_fill_padding(ctx, 0);
749
750 if (final || (ctx->bufcnt == ctx->buflen)) {
751 count = ctx->bufcnt;
752 ctx->bufcnt = 0;
753 return atmel_sha_xmit_dma_map(dd, ctx, count, final);
754 }
755
756 return 0;
757}
758
759static int atmel_sha_update_dma_start(struct atmel_sha_dev *dd)
760{
761 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
762 unsigned int length, final, tail;
763 struct scatterlist *sg;
764 unsigned int count;
765
766 if (!ctx->total)
767 return 0;
768
769 if (ctx->bufcnt || ctx->offset)
770 return atmel_sha_update_dma_slow(dd);
771
772 dev_dbg(dd->dev, "fast: digcnt: 0x%llx 0x%llx, bufcnt: %zd, total: %u\n",
773 ctx->digcnt[1], ctx->digcnt[0], ctx->bufcnt, ctx->total);
774
775 sg = ctx->sg;
776
777 if (!IS_ALIGNED(sg->offset, sizeof(u32)))
778 return atmel_sha_update_dma_slow(dd);
779
780 if (!sg_is_last(sg) && !IS_ALIGNED(sg->length, ctx->block_size))
781 /* size is not ctx->block_size aligned */
782 return atmel_sha_update_dma_slow(dd);
783
784 length = min(ctx->total, sg->length);
785
786 if (sg_is_last(sg)) {
787 if (!(ctx->flags & SHA_FLAGS_FINUP)) {
788 /* not last sg must be ctx->block_size aligned */
789 tail = length & (ctx->block_size - 1);
790 length -= tail;
791 }
792 }
793
794 ctx->total -= length;
795 ctx->offset = length; /* offset where to start slow */
796
797 final = (ctx->flags & SHA_FLAGS_FINUP) && !ctx->total;
798
799 /* Add padding */
800 if (final) {
801 tail = length & (ctx->block_size - 1);
802 length -= tail;
803 ctx->total += tail;
804 ctx->offset = length; /* offset where to start slow */
805
806 sg = ctx->sg;
807 atmel_sha_append_sg(ctx);
808
809 atmel_sha_fill_padding(ctx, length);
810
811 ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer,
812 ctx->buflen + ctx->block_size, DMA_TO_DEVICE);
813 if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
814 dev_err(dd->dev, "dma %zu bytes error\n",
815 ctx->buflen + ctx->block_size);
816 return atmel_sha_complete(dd, -EINVAL);
817 }
818
819 if (length == 0) {
820 ctx->flags &= ~SHA_FLAGS_SG;
821 count = ctx->bufcnt;
822 ctx->bufcnt = 0;
823 return atmel_sha_xmit_start(dd, ctx->dma_addr, count, 0,
824 0, final);
825 } else {
826 ctx->sg = sg;
827 if (!dma_map_sg(dd->dev, ctx->sg, 1,
828 DMA_TO_DEVICE)) {
829 dev_err(dd->dev, "dma_map_sg error\n");
830 return atmel_sha_complete(dd, -EINVAL);
831 }
832
833 ctx->flags |= SHA_FLAGS_SG;
834
835 count = ctx->bufcnt;
836 ctx->bufcnt = 0;
837 return atmel_sha_xmit_start(dd, sg_dma_address(ctx->sg),
838 length, ctx->dma_addr, count, final);
839 }
840 }
841
842 if (!dma_map_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE)) {
843 dev_err(dd->dev, "dma_map_sg error\n");
844 return atmel_sha_complete(dd, -EINVAL);
845 }
846
847 ctx->flags |= SHA_FLAGS_SG;
848
849 /* next call does not fail... so no unmap in the case of error */
850 return atmel_sha_xmit_start(dd, sg_dma_address(ctx->sg), length, 0,
851 0, final);
852}
853
854static void atmel_sha_update_dma_stop(struct atmel_sha_dev *dd)
855{
856 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
857
858 if (ctx->flags & SHA_FLAGS_SG) {
859 dma_unmap_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE);
860 if (ctx->sg->length == ctx->offset) {
861 ctx->sg = sg_next(ctx->sg);
862 if (ctx->sg)
863 ctx->offset = 0;
864 }
865 if (ctx->flags & SHA_FLAGS_PAD) {
866 dma_unmap_single(dd->dev, ctx->dma_addr,
867 ctx->buflen + ctx->block_size, DMA_TO_DEVICE);
868 }
869 } else {
870 dma_unmap_single(dd->dev, ctx->dma_addr, ctx->buflen +
871 ctx->block_size, DMA_TO_DEVICE);
872 }
873}
874
875static int atmel_sha_update_req(struct atmel_sha_dev *dd)
876{
877 struct ahash_request *req = dd->req;
878 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
879 int err;
880
881 dev_dbg(dd->dev, "update_req: total: %u, digcnt: 0x%llx 0x%llx\n",
882 ctx->total, ctx->digcnt[1], ctx->digcnt[0]);
883
884 if (ctx->flags & SHA_FLAGS_CPU)
885 err = atmel_sha_update_cpu(dd);
886 else
887 err = atmel_sha_update_dma_start(dd);
888
889 /* wait for dma completion before can take more data */
890 dev_dbg(dd->dev, "update: err: %d, digcnt: 0x%llx 0%llx\n",
891 err, ctx->digcnt[1], ctx->digcnt[0]);
892
893 return err;
894}
895
896static int atmel_sha_final_req(struct atmel_sha_dev *dd)
897{
898 struct ahash_request *req = dd->req;
899 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
900 int err = 0;
901 int count;
902
903 if (ctx->bufcnt >= ATMEL_SHA_DMA_THRESHOLD) {
904 atmel_sha_fill_padding(ctx, 0);
905 count = ctx->bufcnt;
906 ctx->bufcnt = 0;
907 err = atmel_sha_xmit_dma_map(dd, ctx, count, 1);
908 }
909 /* faster to handle last block with cpu */
910 else {
911 atmel_sha_fill_padding(ctx, 0);
912 count = ctx->bufcnt;
913 ctx->bufcnt = 0;
914 err = atmel_sha_xmit_cpu(dd, ctx->buffer, count, 1);
915 }
916
917 dev_dbg(dd->dev, "final_req: err: %d\n", err);
918
919 return err;
920}
921
922static void atmel_sha_copy_hash(struct ahash_request *req)
923{
924 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
925 u32 *hash = (u32 *)ctx->digest;
926 unsigned int i, hashsize;
927
928 switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
929 case SHA_FLAGS_SHA1:
930 hashsize = SHA1_DIGEST_SIZE;
931 break;
932
933 case SHA_FLAGS_SHA224:
934 case SHA_FLAGS_SHA256:
935 hashsize = SHA256_DIGEST_SIZE;
936 break;
937
938 case SHA_FLAGS_SHA384:
939 case SHA_FLAGS_SHA512:
940 hashsize = SHA512_DIGEST_SIZE;
941 break;
942
943 default:
944 /* Should not happen... */
945 return;
946 }
947
948 for (i = 0; i < hashsize / sizeof(u32); ++i)
949 hash[i] = atmel_sha_read(ctx->dd, SHA_REG_DIGEST(i));
950 ctx->flags |= SHA_FLAGS_RESTORE;
951}
952
953static void atmel_sha_copy_ready_hash(struct ahash_request *req)
954{
955 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
956
957 if (!req->result)
958 return;
959
960 switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
961 default:
962 case SHA_FLAGS_SHA1:
963 memcpy(req->result, ctx->digest, SHA1_DIGEST_SIZE);
964 break;
965
966 case SHA_FLAGS_SHA224:
967 memcpy(req->result, ctx->digest, SHA224_DIGEST_SIZE);
968 break;
969
970 case SHA_FLAGS_SHA256:
971 memcpy(req->result, ctx->digest, SHA256_DIGEST_SIZE);
972 break;
973
974 case SHA_FLAGS_SHA384:
975 memcpy(req->result, ctx->digest, SHA384_DIGEST_SIZE);
976 break;
977
978 case SHA_FLAGS_SHA512:
979 memcpy(req->result, ctx->digest, SHA512_DIGEST_SIZE);
980 break;
981 }
982}
983
984static int atmel_sha_finish(struct ahash_request *req)
985{
986 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
987 struct atmel_sha_dev *dd = ctx->dd;
988
989 if (ctx->digcnt[0] || ctx->digcnt[1])
990 atmel_sha_copy_ready_hash(req);
991
992 dev_dbg(dd->dev, "digcnt: 0x%llx 0x%llx, bufcnt: %zd\n", ctx->digcnt[1],
993 ctx->digcnt[0], ctx->bufcnt);
994
995 return 0;
996}
997
998static void atmel_sha_finish_req(struct ahash_request *req, int err)
999{
1000 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1001 struct atmel_sha_dev *dd = ctx->dd;
1002
1003 if (!err) {
1004 atmel_sha_copy_hash(req);
1005 if (SHA_FLAGS_FINAL & dd->flags)
1006 err = atmel_sha_finish(req);
1007 } else {
1008 ctx->flags |= SHA_FLAGS_ERROR;
1009 }
1010
1011 /* atomic operation is not needed here */
1012 (void)atmel_sha_complete(dd, err);
1013}
1014
1015static int atmel_sha_hw_init(struct atmel_sha_dev *dd)
1016{
1017 int err;
1018
1019 err = clk_enable(dd->iclk);
1020 if (err)
1021 return err;
1022
1023 if (!(SHA_FLAGS_INIT & dd->flags)) {
1024 atmel_sha_write(dd, SHA_CR, SHA_CR_SWRST);
1025 dd->flags |= SHA_FLAGS_INIT;
1026 }
1027
1028 return 0;
1029}
1030
1031static inline unsigned int atmel_sha_get_version(struct atmel_sha_dev *dd)
1032{
1033 return atmel_sha_read(dd, SHA_HW_VERSION) & 0x00000fff;
1034}
1035
1036static int atmel_sha_hw_version_init(struct atmel_sha_dev *dd)
1037{
1038 int err;
1039
1040 err = atmel_sha_hw_init(dd);
1041 if (err)
1042 return err;
1043
1044 dd->hw_version = atmel_sha_get_version(dd);
1045
1046 dev_info(dd->dev,
1047 "version: 0x%x\n", dd->hw_version);
1048
1049 clk_disable(dd->iclk);
1050
1051 return 0;
1052}
1053
1054static int atmel_sha_handle_queue(struct atmel_sha_dev *dd,
1055 struct ahash_request *req)
1056{
1057 struct crypto_async_request *async_req, *backlog;
1058 struct atmel_sha_ctx *ctx;
1059 unsigned long flags;
1060 bool start_async;
1061 int err = 0, ret = 0;
1062
1063 spin_lock_irqsave(&dd->lock, flags);
1064 if (req)
1065 ret = ahash_enqueue_request(&dd->queue, req);
1066
1067 if (SHA_FLAGS_BUSY & dd->flags) {
1068 spin_unlock_irqrestore(&dd->lock, flags);
1069 return ret;
1070 }
1071
1072 backlog = crypto_get_backlog(&dd->queue);
1073 async_req = crypto_dequeue_request(&dd->queue);
1074 if (async_req)
1075 dd->flags |= SHA_FLAGS_BUSY;
1076
1077 spin_unlock_irqrestore(&dd->lock, flags);
1078
1079 if (!async_req)
1080 return ret;
1081
1082 if (backlog)
1083 crypto_request_complete(backlog, -EINPROGRESS);
1084
1085 ctx = crypto_tfm_ctx(async_req->tfm);
1086
1087 dd->req = ahash_request_cast(async_req);
1088 start_async = (dd->req != req);
1089 dd->is_async = start_async;
1090 dd->force_complete = false;
1091
1092 /* WARNING: ctx->start() MAY change dd->is_async. */
1093 err = ctx->start(dd);
1094 return (start_async) ? ret : err;
1095}
1096
1097static int atmel_sha_done(struct atmel_sha_dev *dd);
1098
1099static int atmel_sha_start(struct atmel_sha_dev *dd)
1100{
1101 struct ahash_request *req = dd->req;
1102 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1103 int err;
1104
1105 dev_dbg(dd->dev, "handling new req, op: %lu, nbytes: %u\n",
1106 ctx->op, req->nbytes);
1107
1108 err = atmel_sha_hw_init(dd);
1109 if (err)
1110 return atmel_sha_complete(dd, err);
1111
1112 /*
1113 * atmel_sha_update_req() and atmel_sha_final_req() can return either:
1114 * -EINPROGRESS: the hardware is busy and the SHA driver will resume
1115 * its job later in the done_task.
1116 * This is the main path.
1117 *
1118 * 0: the SHA driver can continue its job then release the hardware
1119 * later, if needed, with atmel_sha_finish_req().
1120 * This is the alternate path.
1121 *
1122 * < 0: an error has occurred so atmel_sha_complete(dd, err) has already
1123 * been called, hence the hardware has been released.
1124 * The SHA driver must stop its job without calling
1125 * atmel_sha_finish_req(), otherwise atmel_sha_complete() would be
1126 * called a second time.
1127 *
1128 * Please note that currently, atmel_sha_final_req() never returns 0.
1129 */
1130
1131 dd->resume = atmel_sha_done;
1132 if (ctx->op == SHA_OP_UPDATE) {
1133 err = atmel_sha_update_req(dd);
1134 if (!err && (ctx->flags & SHA_FLAGS_FINUP))
1135 /* no final() after finup() */
1136 err = atmel_sha_final_req(dd);
1137 } else if (ctx->op == SHA_OP_FINAL) {
1138 err = atmel_sha_final_req(dd);
1139 }
1140
1141 if (!err)
1142 /* done_task will not finish it, so do it here */
1143 atmel_sha_finish_req(req, err);
1144
1145 dev_dbg(dd->dev, "exit, err: %d\n", err);
1146
1147 return err;
1148}
1149
1150static int atmel_sha_enqueue(struct ahash_request *req, unsigned int op)
1151{
1152 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1153 struct atmel_sha_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
1154 struct atmel_sha_dev *dd = tctx->dd;
1155
1156 ctx->op = op;
1157
1158 return atmel_sha_handle_queue(dd, req);
1159}
1160
1161static int atmel_sha_update(struct ahash_request *req)
1162{
1163 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1164
1165 if (!req->nbytes)
1166 return 0;
1167
1168 ctx->total = req->nbytes;
1169 ctx->sg = req->src;
1170 ctx->offset = 0;
1171
1172 if (ctx->flags & SHA_FLAGS_FINUP) {
1173 if (ctx->bufcnt + ctx->total < ATMEL_SHA_DMA_THRESHOLD)
1174 /* faster to use CPU for short transfers */
1175 ctx->flags |= SHA_FLAGS_CPU;
1176 } else if (ctx->bufcnt + ctx->total < ctx->buflen) {
1177 atmel_sha_append_sg(ctx);
1178 return 0;
1179 }
1180 return atmel_sha_enqueue(req, SHA_OP_UPDATE);
1181}
1182
1183static int atmel_sha_final(struct ahash_request *req)
1184{
1185 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1186
1187 ctx->flags |= SHA_FLAGS_FINUP;
1188
1189 if (ctx->flags & SHA_FLAGS_ERROR)
1190 return 0; /* uncompleted hash is not needed */
1191
1192 if (ctx->flags & SHA_FLAGS_PAD)
1193 /* copy ready hash (+ finalize hmac) */
1194 return atmel_sha_finish(req);
1195
1196 return atmel_sha_enqueue(req, SHA_OP_FINAL);
1197}
1198
1199static int atmel_sha_finup(struct ahash_request *req)
1200{
1201 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1202 int err1, err2;
1203
1204 ctx->flags |= SHA_FLAGS_FINUP;
1205
1206 err1 = atmel_sha_update(req);
1207 if (err1 == -EINPROGRESS ||
1208 (err1 == -EBUSY && (ahash_request_flags(req) &
1209 CRYPTO_TFM_REQ_MAY_BACKLOG)))
1210 return err1;
1211
1212 /*
1213 * final() has to be always called to cleanup resources
1214 * even if udpate() failed, except EINPROGRESS
1215 */
1216 err2 = atmel_sha_final(req);
1217
1218 return err1 ?: err2;
1219}
1220
1221static int atmel_sha_digest(struct ahash_request *req)
1222{
1223 return atmel_sha_init(req) ?: atmel_sha_finup(req);
1224}
1225
1226
1227static int atmel_sha_export(struct ahash_request *req, void *out)
1228{
1229 const struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1230
1231 memcpy(out, ctx, sizeof(*ctx));
1232 return 0;
1233}
1234
1235static int atmel_sha_import(struct ahash_request *req, const void *in)
1236{
1237 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1238
1239 memcpy(ctx, in, sizeof(*ctx));
1240 return 0;
1241}
1242
1243static int atmel_sha_cra_init(struct crypto_tfm *tfm)
1244{
1245 struct atmel_sha_ctx *ctx = crypto_tfm_ctx(tfm);
1246
1247 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
1248 sizeof(struct atmel_sha_reqctx));
1249 ctx->start = atmel_sha_start;
1250
1251 return 0;
1252}
1253
1254static void atmel_sha_alg_init(struct ahash_alg *alg)
1255{
1256 alg->halg.base.cra_priority = ATMEL_SHA_PRIORITY;
1257 alg->halg.base.cra_flags = CRYPTO_ALG_ASYNC;
1258 alg->halg.base.cra_ctxsize = sizeof(struct atmel_sha_ctx);
1259 alg->halg.base.cra_module = THIS_MODULE;
1260 alg->halg.base.cra_init = atmel_sha_cra_init;
1261
1262 alg->halg.statesize = sizeof(struct atmel_sha_reqctx);
1263
1264 alg->init = atmel_sha_init;
1265 alg->update = atmel_sha_update;
1266 alg->final = atmel_sha_final;
1267 alg->finup = atmel_sha_finup;
1268 alg->digest = atmel_sha_digest;
1269 alg->export = atmel_sha_export;
1270 alg->import = atmel_sha_import;
1271}
1272
1273static struct ahash_alg sha_1_256_algs[] = {
1274{
1275 .halg.base.cra_name = "sha1",
1276 .halg.base.cra_driver_name = "atmel-sha1",
1277 .halg.base.cra_blocksize = SHA1_BLOCK_SIZE,
1278
1279 .halg.digestsize = SHA1_DIGEST_SIZE,
1280},
1281{
1282 .halg.base.cra_name = "sha256",
1283 .halg.base.cra_driver_name = "atmel-sha256",
1284 .halg.base.cra_blocksize = SHA256_BLOCK_SIZE,
1285
1286 .halg.digestsize = SHA256_DIGEST_SIZE,
1287},
1288};
1289
1290static struct ahash_alg sha_224_alg = {
1291 .halg.base.cra_name = "sha224",
1292 .halg.base.cra_driver_name = "atmel-sha224",
1293 .halg.base.cra_blocksize = SHA224_BLOCK_SIZE,
1294
1295 .halg.digestsize = SHA224_DIGEST_SIZE,
1296};
1297
1298static struct ahash_alg sha_384_512_algs[] = {
1299{
1300 .halg.base.cra_name = "sha384",
1301 .halg.base.cra_driver_name = "atmel-sha384",
1302 .halg.base.cra_blocksize = SHA384_BLOCK_SIZE,
1303
1304 .halg.digestsize = SHA384_DIGEST_SIZE,
1305},
1306{
1307 .halg.base.cra_name = "sha512",
1308 .halg.base.cra_driver_name = "atmel-sha512",
1309 .halg.base.cra_blocksize = SHA512_BLOCK_SIZE,
1310
1311 .halg.digestsize = SHA512_DIGEST_SIZE,
1312},
1313};
1314
1315static void atmel_sha_queue_task(unsigned long data)
1316{
1317 struct atmel_sha_dev *dd = (struct atmel_sha_dev *)data;
1318
1319 atmel_sha_handle_queue(dd, NULL);
1320}
1321
1322static int atmel_sha_done(struct atmel_sha_dev *dd)
1323{
1324 int err = 0;
1325
1326 if (SHA_FLAGS_CPU & dd->flags) {
1327 if (SHA_FLAGS_OUTPUT_READY & dd->flags) {
1328 dd->flags &= ~SHA_FLAGS_OUTPUT_READY;
1329 goto finish;
1330 }
1331 } else if (SHA_FLAGS_DMA_READY & dd->flags) {
1332 if (SHA_FLAGS_DMA_ACTIVE & dd->flags) {
1333 dd->flags &= ~SHA_FLAGS_DMA_ACTIVE;
1334 atmel_sha_update_dma_stop(dd);
1335 }
1336 if (SHA_FLAGS_OUTPUT_READY & dd->flags) {
1337 /* hash or semi-hash ready */
1338 dd->flags &= ~(SHA_FLAGS_DMA_READY |
1339 SHA_FLAGS_OUTPUT_READY);
1340 err = atmel_sha_update_dma_start(dd);
1341 if (err != -EINPROGRESS)
1342 goto finish;
1343 }
1344 }
1345 return err;
1346
1347finish:
1348 /* finish curent request */
1349 atmel_sha_finish_req(dd->req, err);
1350
1351 return err;
1352}
1353
1354static void atmel_sha_done_task(unsigned long data)
1355{
1356 struct atmel_sha_dev *dd = (struct atmel_sha_dev *)data;
1357
1358 dd->is_async = true;
1359 (void)dd->resume(dd);
1360}
1361
1362static irqreturn_t atmel_sha_irq(int irq, void *dev_id)
1363{
1364 struct atmel_sha_dev *sha_dd = dev_id;
1365 u32 reg;
1366
1367 reg = atmel_sha_read(sha_dd, SHA_ISR);
1368 if (reg & atmel_sha_read(sha_dd, SHA_IMR)) {
1369 atmel_sha_write(sha_dd, SHA_IDR, reg);
1370 if (SHA_FLAGS_BUSY & sha_dd->flags) {
1371 sha_dd->flags |= SHA_FLAGS_OUTPUT_READY;
1372 if (!(SHA_FLAGS_CPU & sha_dd->flags))
1373 sha_dd->flags |= SHA_FLAGS_DMA_READY;
1374 tasklet_schedule(&sha_dd->done_task);
1375 } else {
1376 dev_warn(sha_dd->dev, "SHA interrupt when no active requests.\n");
1377 }
1378 return IRQ_HANDLED;
1379 }
1380
1381 return IRQ_NONE;
1382}
1383
1384
1385/* DMA transfer functions */
1386
1387static bool atmel_sha_dma_check_aligned(struct atmel_sha_dev *dd,
1388 struct scatterlist *sg,
1389 size_t len)
1390{
1391 struct atmel_sha_dma *dma = &dd->dma_lch_in;
1392 struct ahash_request *req = dd->req;
1393 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1394 size_t bs = ctx->block_size;
1395 int nents;
1396
1397 for (nents = 0; sg; sg = sg_next(sg), ++nents) {
1398 if (!IS_ALIGNED(sg->offset, sizeof(u32)))
1399 return false;
1400
1401 /*
1402 * This is the last sg, the only one that is allowed to
1403 * have an unaligned length.
1404 */
1405 if (len <= sg->length) {
1406 dma->nents = nents + 1;
1407 dma->last_sg_length = sg->length;
1408 sg->length = ALIGN(len, sizeof(u32));
1409 return true;
1410 }
1411
1412 /* All other sg lengths MUST be aligned to the block size. */
1413 if (!IS_ALIGNED(sg->length, bs))
1414 return false;
1415
1416 len -= sg->length;
1417 }
1418
1419 return false;
1420}
1421
1422static void atmel_sha_dma_callback2(void *data)
1423{
1424 struct atmel_sha_dev *dd = data;
1425 struct atmel_sha_dma *dma = &dd->dma_lch_in;
1426 struct scatterlist *sg;
1427 int nents;
1428
1429 dma_unmap_sg(dd->dev, dma->sg, dma->nents, DMA_TO_DEVICE);
1430
1431 sg = dma->sg;
1432 for (nents = 0; nents < dma->nents - 1; ++nents)
1433 sg = sg_next(sg);
1434 sg->length = dma->last_sg_length;
1435
1436 dd->is_async = true;
1437 (void)atmel_sha_wait_for_data_ready(dd, dd->resume);
1438}
1439
1440static int atmel_sha_dma_start(struct atmel_sha_dev *dd,
1441 struct scatterlist *src,
1442 size_t len,
1443 atmel_sha_fn_t resume)
1444{
1445 struct atmel_sha_dma *dma = &dd->dma_lch_in;
1446 struct dma_slave_config *config = &dma->dma_conf;
1447 struct dma_chan *chan = dma->chan;
1448 struct dma_async_tx_descriptor *desc;
1449 dma_cookie_t cookie;
1450 unsigned int sg_len;
1451 int err;
1452
1453 dd->resume = resume;
1454
1455 /*
1456 * dma->nents has already been initialized by
1457 * atmel_sha_dma_check_aligned().
1458 */
1459 dma->sg = src;
1460 sg_len = dma_map_sg(dd->dev, dma->sg, dma->nents, DMA_TO_DEVICE);
1461 if (!sg_len) {
1462 err = -ENOMEM;
1463 goto exit;
1464 }
1465
1466 config->src_maxburst = 16;
1467 config->dst_maxburst = 16;
1468 err = dmaengine_slave_config(chan, config);
1469 if (err)
1470 goto unmap_sg;
1471
1472 desc = dmaengine_prep_slave_sg(chan, dma->sg, sg_len, DMA_MEM_TO_DEV,
1473 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1474 if (!desc) {
1475 err = -ENOMEM;
1476 goto unmap_sg;
1477 }
1478
1479 desc->callback = atmel_sha_dma_callback2;
1480 desc->callback_param = dd;
1481 cookie = dmaengine_submit(desc);
1482 err = dma_submit_error(cookie);
1483 if (err)
1484 goto unmap_sg;
1485
1486 dma_async_issue_pending(chan);
1487
1488 return -EINPROGRESS;
1489
1490unmap_sg:
1491 dma_unmap_sg(dd->dev, dma->sg, dma->nents, DMA_TO_DEVICE);
1492exit:
1493 return atmel_sha_complete(dd, err);
1494}
1495
1496
1497/* CPU transfer functions */
1498
1499static int atmel_sha_cpu_transfer(struct atmel_sha_dev *dd)
1500{
1501 struct ahash_request *req = dd->req;
1502 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1503 const u32 *words = (const u32 *)ctx->buffer;
1504 size_t i, num_words;
1505 u32 isr, din, din_inc;
1506
1507 din_inc = (ctx->flags & SHA_FLAGS_IDATAR0) ? 0 : 1;
1508 for (;;) {
1509 /* Write data into the Input Data Registers. */
1510 num_words = DIV_ROUND_UP(ctx->bufcnt, sizeof(u32));
1511 for (i = 0, din = 0; i < num_words; ++i, din += din_inc)
1512 atmel_sha_write(dd, SHA_REG_DIN(din), words[i]);
1513
1514 ctx->offset += ctx->bufcnt;
1515 ctx->total -= ctx->bufcnt;
1516
1517 if (!ctx->total)
1518 break;
1519
1520 /*
1521 * Prepare next block:
1522 * Fill ctx->buffer now with the next data to be written into
1523 * IDATARx: it gives time for the SHA hardware to process
1524 * the current data so the SHA_INT_DATARDY flag might be set
1525 * in SHA_ISR when polling this register at the beginning of
1526 * the next loop.
1527 */
1528 ctx->bufcnt = min_t(size_t, ctx->block_size, ctx->total);
1529 scatterwalk_map_and_copy(ctx->buffer, ctx->sg,
1530 ctx->offset, ctx->bufcnt, 0);
1531
1532 /* Wait for hardware to be ready again. */
1533 isr = atmel_sha_read(dd, SHA_ISR);
1534 if (!(isr & SHA_INT_DATARDY)) {
1535 /* Not ready yet. */
1536 dd->resume = atmel_sha_cpu_transfer;
1537 atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
1538 return -EINPROGRESS;
1539 }
1540 }
1541
1542 if (unlikely(!(ctx->flags & SHA_FLAGS_WAIT_DATARDY)))
1543 return dd->cpu_transfer_complete(dd);
1544
1545 return atmel_sha_wait_for_data_ready(dd, dd->cpu_transfer_complete);
1546}
1547
1548static int atmel_sha_cpu_start(struct atmel_sha_dev *dd,
1549 struct scatterlist *sg,
1550 unsigned int len,
1551 bool idatar0_only,
1552 bool wait_data_ready,
1553 atmel_sha_fn_t resume)
1554{
1555 struct ahash_request *req = dd->req;
1556 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1557
1558 if (!len)
1559 return resume(dd);
1560
1561 ctx->flags &= ~(SHA_FLAGS_IDATAR0 | SHA_FLAGS_WAIT_DATARDY);
1562
1563 if (idatar0_only)
1564 ctx->flags |= SHA_FLAGS_IDATAR0;
1565
1566 if (wait_data_ready)
1567 ctx->flags |= SHA_FLAGS_WAIT_DATARDY;
1568
1569 ctx->sg = sg;
1570 ctx->total = len;
1571 ctx->offset = 0;
1572
1573 /* Prepare the first block to be written. */
1574 ctx->bufcnt = min_t(size_t, ctx->block_size, ctx->total);
1575 scatterwalk_map_and_copy(ctx->buffer, ctx->sg,
1576 ctx->offset, ctx->bufcnt, 0);
1577
1578 dd->cpu_transfer_complete = resume;
1579 return atmel_sha_cpu_transfer(dd);
1580}
1581
1582static int atmel_sha_cpu_hash(struct atmel_sha_dev *dd,
1583 const void *data, unsigned int datalen,
1584 bool auto_padding,
1585 atmel_sha_fn_t resume)
1586{
1587 struct ahash_request *req = dd->req;
1588 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1589 u32 msglen = (auto_padding) ? datalen : 0;
1590 u32 mr = SHA_MR_MODE_AUTO;
1591
1592 if (!(IS_ALIGNED(datalen, ctx->block_size) || auto_padding))
1593 return atmel_sha_complete(dd, -EINVAL);
1594
1595 mr |= (ctx->flags & SHA_FLAGS_ALGO_MASK);
1596 atmel_sha_write(dd, SHA_MR, mr);
1597 atmel_sha_write(dd, SHA_MSR, msglen);
1598 atmel_sha_write(dd, SHA_BCR, msglen);
1599 atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
1600
1601 sg_init_one(&dd->tmp, data, datalen);
1602 return atmel_sha_cpu_start(dd, &dd->tmp, datalen, false, true, resume);
1603}
1604
1605
1606/* hmac functions */
1607
1608struct atmel_sha_hmac_key {
1609 bool valid;
1610 unsigned int keylen;
1611 u8 buffer[SHA512_BLOCK_SIZE];
1612 u8 *keydup;
1613};
1614
1615static inline void atmel_sha_hmac_key_init(struct atmel_sha_hmac_key *hkey)
1616{
1617 memset(hkey, 0, sizeof(*hkey));
1618}
1619
1620static inline void atmel_sha_hmac_key_release(struct atmel_sha_hmac_key *hkey)
1621{
1622 kfree(hkey->keydup);
1623 memset(hkey, 0, sizeof(*hkey));
1624}
1625
1626static inline int atmel_sha_hmac_key_set(struct atmel_sha_hmac_key *hkey,
1627 const u8 *key,
1628 unsigned int keylen)
1629{
1630 atmel_sha_hmac_key_release(hkey);
1631
1632 if (keylen > sizeof(hkey->buffer)) {
1633 hkey->keydup = kmemdup(key, keylen, GFP_KERNEL);
1634 if (!hkey->keydup)
1635 return -ENOMEM;
1636
1637 } else {
1638 memcpy(hkey->buffer, key, keylen);
1639 }
1640
1641 hkey->valid = true;
1642 hkey->keylen = keylen;
1643 return 0;
1644}
1645
1646static inline bool atmel_sha_hmac_key_get(const struct atmel_sha_hmac_key *hkey,
1647 const u8 **key,
1648 unsigned int *keylen)
1649{
1650 if (!hkey->valid)
1651 return false;
1652
1653 *keylen = hkey->keylen;
1654 *key = (hkey->keydup) ? hkey->keydup : hkey->buffer;
1655 return true;
1656}
1657
1658
1659struct atmel_sha_hmac_ctx {
1660 struct atmel_sha_ctx base;
1661
1662 struct atmel_sha_hmac_key hkey;
1663 u32 ipad[SHA512_BLOCK_SIZE / sizeof(u32)];
1664 u32 opad[SHA512_BLOCK_SIZE / sizeof(u32)];
1665 atmel_sha_fn_t resume;
1666};
1667
1668static int atmel_sha_hmac_setup(struct atmel_sha_dev *dd,
1669 atmel_sha_fn_t resume);
1670static int atmel_sha_hmac_prehash_key(struct atmel_sha_dev *dd,
1671 const u8 *key, unsigned int keylen);
1672static int atmel_sha_hmac_prehash_key_done(struct atmel_sha_dev *dd);
1673static int atmel_sha_hmac_compute_ipad_hash(struct atmel_sha_dev *dd);
1674static int atmel_sha_hmac_compute_opad_hash(struct atmel_sha_dev *dd);
1675static int atmel_sha_hmac_setup_done(struct atmel_sha_dev *dd);
1676
1677static int atmel_sha_hmac_init_done(struct atmel_sha_dev *dd);
1678static int atmel_sha_hmac_final(struct atmel_sha_dev *dd);
1679static int atmel_sha_hmac_final_done(struct atmel_sha_dev *dd);
1680static int atmel_sha_hmac_digest2(struct atmel_sha_dev *dd);
1681
1682static int atmel_sha_hmac_setup(struct atmel_sha_dev *dd,
1683 atmel_sha_fn_t resume)
1684{
1685 struct ahash_request *req = dd->req;
1686 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1687 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1688 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1689 unsigned int keylen;
1690 const u8 *key;
1691 size_t bs;
1692
1693 hmac->resume = resume;
1694 switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
1695 case SHA_FLAGS_SHA1:
1696 ctx->block_size = SHA1_BLOCK_SIZE;
1697 ctx->hash_size = SHA1_DIGEST_SIZE;
1698 break;
1699
1700 case SHA_FLAGS_SHA224:
1701 ctx->block_size = SHA224_BLOCK_SIZE;
1702 ctx->hash_size = SHA256_DIGEST_SIZE;
1703 break;
1704
1705 case SHA_FLAGS_SHA256:
1706 ctx->block_size = SHA256_BLOCK_SIZE;
1707 ctx->hash_size = SHA256_DIGEST_SIZE;
1708 break;
1709
1710 case SHA_FLAGS_SHA384:
1711 ctx->block_size = SHA384_BLOCK_SIZE;
1712 ctx->hash_size = SHA512_DIGEST_SIZE;
1713 break;
1714
1715 case SHA_FLAGS_SHA512:
1716 ctx->block_size = SHA512_BLOCK_SIZE;
1717 ctx->hash_size = SHA512_DIGEST_SIZE;
1718 break;
1719
1720 default:
1721 return atmel_sha_complete(dd, -EINVAL);
1722 }
1723 bs = ctx->block_size;
1724
1725 if (likely(!atmel_sha_hmac_key_get(&hmac->hkey, &key, &keylen)))
1726 return resume(dd);
1727
1728 /* Compute K' from K. */
1729 if (unlikely(keylen > bs))
1730 return atmel_sha_hmac_prehash_key(dd, key, keylen);
1731
1732 /* Prepare ipad. */
1733 memcpy((u8 *)hmac->ipad, key, keylen);
1734 memset((u8 *)hmac->ipad + keylen, 0, bs - keylen);
1735 return atmel_sha_hmac_compute_ipad_hash(dd);
1736}
1737
1738static int atmel_sha_hmac_prehash_key(struct atmel_sha_dev *dd,
1739 const u8 *key, unsigned int keylen)
1740{
1741 return atmel_sha_cpu_hash(dd, key, keylen, true,
1742 atmel_sha_hmac_prehash_key_done);
1743}
1744
1745static int atmel_sha_hmac_prehash_key_done(struct atmel_sha_dev *dd)
1746{
1747 struct ahash_request *req = dd->req;
1748 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1749 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1750 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1751 size_t ds = crypto_ahash_digestsize(tfm);
1752 size_t bs = ctx->block_size;
1753 size_t i, num_words = ds / sizeof(u32);
1754
1755 /* Prepare ipad. */
1756 for (i = 0; i < num_words; ++i)
1757 hmac->ipad[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
1758 memset((u8 *)hmac->ipad + ds, 0, bs - ds);
1759 return atmel_sha_hmac_compute_ipad_hash(dd);
1760}
1761
1762static int atmel_sha_hmac_compute_ipad_hash(struct atmel_sha_dev *dd)
1763{
1764 struct ahash_request *req = dd->req;
1765 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1766 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1767 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1768 size_t bs = ctx->block_size;
1769 size_t i, num_words = bs / sizeof(u32);
1770
1771 unsafe_memcpy(hmac->opad, hmac->ipad, bs,
1772 "fortified memcpy causes -Wrestrict warning");
1773 for (i = 0; i < num_words; ++i) {
1774 hmac->ipad[i] ^= 0x36363636;
1775 hmac->opad[i] ^= 0x5c5c5c5c;
1776 }
1777
1778 return atmel_sha_cpu_hash(dd, hmac->ipad, bs, false,
1779 atmel_sha_hmac_compute_opad_hash);
1780}
1781
1782static int atmel_sha_hmac_compute_opad_hash(struct atmel_sha_dev *dd)
1783{
1784 struct ahash_request *req = dd->req;
1785 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1786 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1787 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1788 size_t bs = ctx->block_size;
1789 size_t hs = ctx->hash_size;
1790 size_t i, num_words = hs / sizeof(u32);
1791
1792 for (i = 0; i < num_words; ++i)
1793 hmac->ipad[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
1794 return atmel_sha_cpu_hash(dd, hmac->opad, bs, false,
1795 atmel_sha_hmac_setup_done);
1796}
1797
1798static int atmel_sha_hmac_setup_done(struct atmel_sha_dev *dd)
1799{
1800 struct ahash_request *req = dd->req;
1801 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1802 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1803 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1804 size_t hs = ctx->hash_size;
1805 size_t i, num_words = hs / sizeof(u32);
1806
1807 for (i = 0; i < num_words; ++i)
1808 hmac->opad[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
1809 atmel_sha_hmac_key_release(&hmac->hkey);
1810 return hmac->resume(dd);
1811}
1812
1813static int atmel_sha_hmac_start(struct atmel_sha_dev *dd)
1814{
1815 struct ahash_request *req = dd->req;
1816 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1817 int err;
1818
1819 err = atmel_sha_hw_init(dd);
1820 if (err)
1821 return atmel_sha_complete(dd, err);
1822
1823 switch (ctx->op) {
1824 case SHA_OP_INIT:
1825 err = atmel_sha_hmac_setup(dd, atmel_sha_hmac_init_done);
1826 break;
1827
1828 case SHA_OP_UPDATE:
1829 dd->resume = atmel_sha_done;
1830 err = atmel_sha_update_req(dd);
1831 break;
1832
1833 case SHA_OP_FINAL:
1834 dd->resume = atmel_sha_hmac_final;
1835 err = atmel_sha_final_req(dd);
1836 break;
1837
1838 case SHA_OP_DIGEST:
1839 err = atmel_sha_hmac_setup(dd, atmel_sha_hmac_digest2);
1840 break;
1841
1842 default:
1843 return atmel_sha_complete(dd, -EINVAL);
1844 }
1845
1846 return err;
1847}
1848
1849static int atmel_sha_hmac_setkey(struct crypto_ahash *tfm, const u8 *key,
1850 unsigned int keylen)
1851{
1852 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1853
1854 return atmel_sha_hmac_key_set(&hmac->hkey, key, keylen);
1855}
1856
1857static int atmel_sha_hmac_init(struct ahash_request *req)
1858{
1859 int err;
1860
1861 err = atmel_sha_init(req);
1862 if (err)
1863 return err;
1864
1865 return atmel_sha_enqueue(req, SHA_OP_INIT);
1866}
1867
1868static int atmel_sha_hmac_init_done(struct atmel_sha_dev *dd)
1869{
1870 struct ahash_request *req = dd->req;
1871 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1872 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1873 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1874 size_t bs = ctx->block_size;
1875 size_t hs = ctx->hash_size;
1876
1877 ctx->bufcnt = 0;
1878 ctx->digcnt[0] = bs;
1879 ctx->digcnt[1] = 0;
1880 ctx->flags |= SHA_FLAGS_RESTORE;
1881 memcpy(ctx->digest, hmac->ipad, hs);
1882 return atmel_sha_complete(dd, 0);
1883}
1884
1885static int atmel_sha_hmac_final(struct atmel_sha_dev *dd)
1886{
1887 struct ahash_request *req = dd->req;
1888 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1889 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1890 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1891 u32 *digest = (u32 *)ctx->digest;
1892 size_t ds = crypto_ahash_digestsize(tfm);
1893 size_t bs = ctx->block_size;
1894 size_t hs = ctx->hash_size;
1895 size_t i, num_words;
1896 u32 mr;
1897
1898 /* Save d = SHA((K' + ipad) | msg). */
1899 num_words = ds / sizeof(u32);
1900 for (i = 0; i < num_words; ++i)
1901 digest[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
1902
1903 /* Restore context to finish computing SHA((K' + opad) | d). */
1904 atmel_sha_write(dd, SHA_CR, SHA_CR_WUIHV);
1905 num_words = hs / sizeof(u32);
1906 for (i = 0; i < num_words; ++i)
1907 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->opad[i]);
1908
1909 mr = SHA_MR_MODE_AUTO | SHA_MR_UIHV;
1910 mr |= (ctx->flags & SHA_FLAGS_ALGO_MASK);
1911 atmel_sha_write(dd, SHA_MR, mr);
1912 atmel_sha_write(dd, SHA_MSR, bs + ds);
1913 atmel_sha_write(dd, SHA_BCR, ds);
1914 atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
1915
1916 sg_init_one(&dd->tmp, digest, ds);
1917 return atmel_sha_cpu_start(dd, &dd->tmp, ds, false, true,
1918 atmel_sha_hmac_final_done);
1919}
1920
1921static int atmel_sha_hmac_final_done(struct atmel_sha_dev *dd)
1922{
1923 /*
1924 * req->result might not be sizeof(u32) aligned, so copy the
1925 * digest into ctx->digest[] before memcpy() the data into
1926 * req->result.
1927 */
1928 atmel_sha_copy_hash(dd->req);
1929 atmel_sha_copy_ready_hash(dd->req);
1930 return atmel_sha_complete(dd, 0);
1931}
1932
1933static int atmel_sha_hmac_digest(struct ahash_request *req)
1934{
1935 int err;
1936
1937 err = atmel_sha_init(req);
1938 if (err)
1939 return err;
1940
1941 return atmel_sha_enqueue(req, SHA_OP_DIGEST);
1942}
1943
1944static int atmel_sha_hmac_digest2(struct atmel_sha_dev *dd)
1945{
1946 struct ahash_request *req = dd->req;
1947 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1948 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1949 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1950 struct scatterlist *sgbuf;
1951 size_t hs = ctx->hash_size;
1952 size_t i, num_words = hs / sizeof(u32);
1953 bool use_dma = false;
1954 u32 mr;
1955
1956 /* Special case for empty message. */
1957 if (!req->nbytes) {
1958 req->nbytes = 0;
1959 ctx->bufcnt = 0;
1960 ctx->digcnt[0] = 0;
1961 ctx->digcnt[1] = 0;
1962 switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
1963 case SHA_FLAGS_SHA1:
1964 case SHA_FLAGS_SHA224:
1965 case SHA_FLAGS_SHA256:
1966 atmel_sha_fill_padding(ctx, 64);
1967 break;
1968
1969 case SHA_FLAGS_SHA384:
1970 case SHA_FLAGS_SHA512:
1971 atmel_sha_fill_padding(ctx, 128);
1972 break;
1973 }
1974 sg_init_one(&dd->tmp, ctx->buffer, ctx->bufcnt);
1975 }
1976
1977 /* Check DMA threshold and alignment. */
1978 if (req->nbytes > ATMEL_SHA_DMA_THRESHOLD &&
1979 atmel_sha_dma_check_aligned(dd, req->src, req->nbytes))
1980 use_dma = true;
1981
1982 /* Write both initial hash values to compute a HMAC. */
1983 atmel_sha_write(dd, SHA_CR, SHA_CR_WUIHV);
1984 for (i = 0; i < num_words; ++i)
1985 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->ipad[i]);
1986
1987 atmel_sha_write(dd, SHA_CR, SHA_CR_WUIEHV);
1988 for (i = 0; i < num_words; ++i)
1989 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->opad[i]);
1990
1991 /* Write the Mode, Message Size, Bytes Count then Control Registers. */
1992 mr = (SHA_MR_HMAC | SHA_MR_DUALBUFF);
1993 mr |= ctx->flags & SHA_FLAGS_ALGO_MASK;
1994 if (use_dma)
1995 mr |= SHA_MR_MODE_IDATAR0;
1996 else
1997 mr |= SHA_MR_MODE_AUTO;
1998 atmel_sha_write(dd, SHA_MR, mr);
1999
2000 atmel_sha_write(dd, SHA_MSR, req->nbytes);
2001 atmel_sha_write(dd, SHA_BCR, req->nbytes);
2002
2003 atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
2004
2005 /* Special case for empty message. */
2006 if (!req->nbytes) {
2007 sgbuf = &dd->tmp;
2008 req->nbytes = ctx->bufcnt;
2009 } else {
2010 sgbuf = req->src;
2011 }
2012
2013 /* Process data. */
2014 if (use_dma)
2015 return atmel_sha_dma_start(dd, sgbuf, req->nbytes,
2016 atmel_sha_hmac_final_done);
2017
2018 return atmel_sha_cpu_start(dd, sgbuf, req->nbytes, false, true,
2019 atmel_sha_hmac_final_done);
2020}
2021
2022static int atmel_sha_hmac_cra_init(struct crypto_tfm *tfm)
2023{
2024 struct atmel_sha_hmac_ctx *hmac = crypto_tfm_ctx(tfm);
2025
2026 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
2027 sizeof(struct atmel_sha_reqctx));
2028 hmac->base.start = atmel_sha_hmac_start;
2029 atmel_sha_hmac_key_init(&hmac->hkey);
2030
2031 return 0;
2032}
2033
2034static void atmel_sha_hmac_cra_exit(struct crypto_tfm *tfm)
2035{
2036 struct atmel_sha_hmac_ctx *hmac = crypto_tfm_ctx(tfm);
2037
2038 atmel_sha_hmac_key_release(&hmac->hkey);
2039}
2040
2041static void atmel_sha_hmac_alg_init(struct ahash_alg *alg)
2042{
2043 alg->halg.base.cra_priority = ATMEL_SHA_PRIORITY;
2044 alg->halg.base.cra_flags = CRYPTO_ALG_ASYNC;
2045 alg->halg.base.cra_ctxsize = sizeof(struct atmel_sha_hmac_ctx);
2046 alg->halg.base.cra_module = THIS_MODULE;
2047 alg->halg.base.cra_init = atmel_sha_hmac_cra_init;
2048 alg->halg.base.cra_exit = atmel_sha_hmac_cra_exit;
2049
2050 alg->halg.statesize = sizeof(struct atmel_sha_reqctx);
2051
2052 alg->init = atmel_sha_hmac_init;
2053 alg->update = atmel_sha_update;
2054 alg->final = atmel_sha_final;
2055 alg->digest = atmel_sha_hmac_digest;
2056 alg->setkey = atmel_sha_hmac_setkey;
2057 alg->export = atmel_sha_export;
2058 alg->import = atmel_sha_import;
2059}
2060
2061static struct ahash_alg sha_hmac_algs[] = {
2062{
2063 .halg.base.cra_name = "hmac(sha1)",
2064 .halg.base.cra_driver_name = "atmel-hmac-sha1",
2065 .halg.base.cra_blocksize = SHA1_BLOCK_SIZE,
2066
2067 .halg.digestsize = SHA1_DIGEST_SIZE,
2068},
2069{
2070 .halg.base.cra_name = "hmac(sha224)",
2071 .halg.base.cra_driver_name = "atmel-hmac-sha224",
2072 .halg.base.cra_blocksize = SHA224_BLOCK_SIZE,
2073
2074 .halg.digestsize = SHA224_DIGEST_SIZE,
2075},
2076{
2077 .halg.base.cra_name = "hmac(sha256)",
2078 .halg.base.cra_driver_name = "atmel-hmac-sha256",
2079 .halg.base.cra_blocksize = SHA256_BLOCK_SIZE,
2080
2081 .halg.digestsize = SHA256_DIGEST_SIZE,
2082},
2083{
2084 .halg.base.cra_name = "hmac(sha384)",
2085 .halg.base.cra_driver_name = "atmel-hmac-sha384",
2086 .halg.base.cra_blocksize = SHA384_BLOCK_SIZE,
2087
2088 .halg.digestsize = SHA384_DIGEST_SIZE,
2089},
2090{
2091 .halg.base.cra_name = "hmac(sha512)",
2092 .halg.base.cra_driver_name = "atmel-hmac-sha512",
2093 .halg.base.cra_blocksize = SHA512_BLOCK_SIZE,
2094
2095 .halg.digestsize = SHA512_DIGEST_SIZE,
2096},
2097};
2098
2099#if IS_ENABLED(CONFIG_CRYPTO_DEV_ATMEL_AUTHENC)
2100/* authenc functions */
2101
2102static int atmel_sha_authenc_init2(struct atmel_sha_dev *dd);
2103static int atmel_sha_authenc_init_done(struct atmel_sha_dev *dd);
2104static int atmel_sha_authenc_final_done(struct atmel_sha_dev *dd);
2105
2106
2107struct atmel_sha_authenc_ctx {
2108 struct crypto_ahash *tfm;
2109};
2110
2111struct atmel_sha_authenc_reqctx {
2112 struct atmel_sha_reqctx base;
2113
2114 atmel_aes_authenc_fn_t cb;
2115 struct atmel_aes_dev *aes_dev;
2116
2117 /* _init() parameters. */
2118 struct scatterlist *assoc;
2119 u32 assoclen;
2120 u32 textlen;
2121
2122 /* _final() parameters. */
2123 u32 *digest;
2124 unsigned int digestlen;
2125};
2126
2127static void atmel_sha_authenc_complete(void *data, int err)
2128{
2129 struct ahash_request *req = data;
2130 struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2131
2132 authctx->cb(authctx->aes_dev, err, authctx->base.dd->is_async);
2133}
2134
2135static int atmel_sha_authenc_start(struct atmel_sha_dev *dd)
2136{
2137 struct ahash_request *req = dd->req;
2138 struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2139 int err;
2140
2141 /*
2142 * Force atmel_sha_complete() to call req->base.complete(), ie
2143 * atmel_sha_authenc_complete(), which in turn calls authctx->cb().
2144 */
2145 dd->force_complete = true;
2146
2147 err = atmel_sha_hw_init(dd);
2148 return authctx->cb(authctx->aes_dev, err, dd->is_async);
2149}
2150
2151bool atmel_sha_authenc_is_ready(void)
2152{
2153 struct atmel_sha_ctx dummy;
2154
2155 dummy.dd = NULL;
2156 return (atmel_sha_find_dev(&dummy) != NULL);
2157}
2158EXPORT_SYMBOL_GPL(atmel_sha_authenc_is_ready);
2159
2160unsigned int atmel_sha_authenc_get_reqsize(void)
2161{
2162 return sizeof(struct atmel_sha_authenc_reqctx);
2163}
2164EXPORT_SYMBOL_GPL(atmel_sha_authenc_get_reqsize);
2165
2166struct atmel_sha_authenc_ctx *atmel_sha_authenc_spawn(unsigned long mode)
2167{
2168 struct atmel_sha_authenc_ctx *auth;
2169 struct crypto_ahash *tfm;
2170 struct atmel_sha_ctx *tctx;
2171 const char *name;
2172 int err = -EINVAL;
2173
2174 switch (mode & SHA_FLAGS_MODE_MASK) {
2175 case SHA_FLAGS_HMAC_SHA1:
2176 name = "atmel-hmac-sha1";
2177 break;
2178
2179 case SHA_FLAGS_HMAC_SHA224:
2180 name = "atmel-hmac-sha224";
2181 break;
2182
2183 case SHA_FLAGS_HMAC_SHA256:
2184 name = "atmel-hmac-sha256";
2185 break;
2186
2187 case SHA_FLAGS_HMAC_SHA384:
2188 name = "atmel-hmac-sha384";
2189 break;
2190
2191 case SHA_FLAGS_HMAC_SHA512:
2192 name = "atmel-hmac-sha512";
2193 break;
2194
2195 default:
2196 goto error;
2197 }
2198
2199 tfm = crypto_alloc_ahash(name, 0, 0);
2200 if (IS_ERR(tfm)) {
2201 err = PTR_ERR(tfm);
2202 goto error;
2203 }
2204 tctx = crypto_ahash_ctx(tfm);
2205 tctx->start = atmel_sha_authenc_start;
2206 tctx->flags = mode;
2207
2208 auth = kzalloc(sizeof(*auth), GFP_KERNEL);
2209 if (!auth) {
2210 err = -ENOMEM;
2211 goto err_free_ahash;
2212 }
2213 auth->tfm = tfm;
2214
2215 return auth;
2216
2217err_free_ahash:
2218 crypto_free_ahash(tfm);
2219error:
2220 return ERR_PTR(err);
2221}
2222EXPORT_SYMBOL_GPL(atmel_sha_authenc_spawn);
2223
2224void atmel_sha_authenc_free(struct atmel_sha_authenc_ctx *auth)
2225{
2226 if (auth)
2227 crypto_free_ahash(auth->tfm);
2228 kfree(auth);
2229}
2230EXPORT_SYMBOL_GPL(atmel_sha_authenc_free);
2231
2232int atmel_sha_authenc_setkey(struct atmel_sha_authenc_ctx *auth,
2233 const u8 *key, unsigned int keylen, u32 flags)
2234{
2235 struct crypto_ahash *tfm = auth->tfm;
2236
2237 crypto_ahash_clear_flags(tfm, CRYPTO_TFM_REQ_MASK);
2238 crypto_ahash_set_flags(tfm, flags & CRYPTO_TFM_REQ_MASK);
2239 return crypto_ahash_setkey(tfm, key, keylen);
2240}
2241EXPORT_SYMBOL_GPL(atmel_sha_authenc_setkey);
2242
2243int atmel_sha_authenc_schedule(struct ahash_request *req,
2244 struct atmel_sha_authenc_ctx *auth,
2245 atmel_aes_authenc_fn_t cb,
2246 struct atmel_aes_dev *aes_dev)
2247{
2248 struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2249 struct atmel_sha_reqctx *ctx = &authctx->base;
2250 struct crypto_ahash *tfm = auth->tfm;
2251 struct atmel_sha_ctx *tctx = crypto_ahash_ctx(tfm);
2252 struct atmel_sha_dev *dd;
2253
2254 /* Reset request context (MUST be done first). */
2255 memset(authctx, 0, sizeof(*authctx));
2256
2257 /* Get SHA device. */
2258 dd = atmel_sha_find_dev(tctx);
2259 if (!dd)
2260 return cb(aes_dev, -ENODEV, false);
2261
2262 /* Init request context. */
2263 ctx->dd = dd;
2264 ctx->buflen = SHA_BUFFER_LEN;
2265 authctx->cb = cb;
2266 authctx->aes_dev = aes_dev;
2267 ahash_request_set_tfm(req, tfm);
2268 ahash_request_set_callback(req, 0, atmel_sha_authenc_complete, req);
2269
2270 return atmel_sha_handle_queue(dd, req);
2271}
2272EXPORT_SYMBOL_GPL(atmel_sha_authenc_schedule);
2273
2274int atmel_sha_authenc_init(struct ahash_request *req,
2275 struct scatterlist *assoc, unsigned int assoclen,
2276 unsigned int textlen,
2277 atmel_aes_authenc_fn_t cb,
2278 struct atmel_aes_dev *aes_dev)
2279{
2280 struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2281 struct atmel_sha_reqctx *ctx = &authctx->base;
2282 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
2283 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
2284 struct atmel_sha_dev *dd = ctx->dd;
2285
2286 if (unlikely(!IS_ALIGNED(assoclen, sizeof(u32))))
2287 return atmel_sha_complete(dd, -EINVAL);
2288
2289 authctx->cb = cb;
2290 authctx->aes_dev = aes_dev;
2291 authctx->assoc = assoc;
2292 authctx->assoclen = assoclen;
2293 authctx->textlen = textlen;
2294
2295 ctx->flags = hmac->base.flags;
2296 return atmel_sha_hmac_setup(dd, atmel_sha_authenc_init2);
2297}
2298EXPORT_SYMBOL_GPL(atmel_sha_authenc_init);
2299
2300static int atmel_sha_authenc_init2(struct atmel_sha_dev *dd)
2301{
2302 struct ahash_request *req = dd->req;
2303 struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2304 struct atmel_sha_reqctx *ctx = &authctx->base;
2305 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
2306 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
2307 size_t hs = ctx->hash_size;
2308 size_t i, num_words = hs / sizeof(u32);
2309 u32 mr, msg_size;
2310
2311 atmel_sha_write(dd, SHA_CR, SHA_CR_WUIHV);
2312 for (i = 0; i < num_words; ++i)
2313 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->ipad[i]);
2314
2315 atmel_sha_write(dd, SHA_CR, SHA_CR_WUIEHV);
2316 for (i = 0; i < num_words; ++i)
2317 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->opad[i]);
2318
2319 mr = (SHA_MR_MODE_IDATAR0 |
2320 SHA_MR_HMAC |
2321 SHA_MR_DUALBUFF);
2322 mr |= ctx->flags & SHA_FLAGS_ALGO_MASK;
2323 atmel_sha_write(dd, SHA_MR, mr);
2324
2325 msg_size = authctx->assoclen + authctx->textlen;
2326 atmel_sha_write(dd, SHA_MSR, msg_size);
2327 atmel_sha_write(dd, SHA_BCR, msg_size);
2328
2329 atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
2330
2331 /* Process assoc data. */
2332 return atmel_sha_cpu_start(dd, authctx->assoc, authctx->assoclen,
2333 true, false,
2334 atmel_sha_authenc_init_done);
2335}
2336
2337static int atmel_sha_authenc_init_done(struct atmel_sha_dev *dd)
2338{
2339 struct ahash_request *req = dd->req;
2340 struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2341
2342 return authctx->cb(authctx->aes_dev, 0, dd->is_async);
2343}
2344
2345int atmel_sha_authenc_final(struct ahash_request *req,
2346 u32 *digest, unsigned int digestlen,
2347 atmel_aes_authenc_fn_t cb,
2348 struct atmel_aes_dev *aes_dev)
2349{
2350 struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2351 struct atmel_sha_reqctx *ctx = &authctx->base;
2352 struct atmel_sha_dev *dd = ctx->dd;
2353
2354 switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
2355 case SHA_FLAGS_SHA1:
2356 authctx->digestlen = SHA1_DIGEST_SIZE;
2357 break;
2358
2359 case SHA_FLAGS_SHA224:
2360 authctx->digestlen = SHA224_DIGEST_SIZE;
2361 break;
2362
2363 case SHA_FLAGS_SHA256:
2364 authctx->digestlen = SHA256_DIGEST_SIZE;
2365 break;
2366
2367 case SHA_FLAGS_SHA384:
2368 authctx->digestlen = SHA384_DIGEST_SIZE;
2369 break;
2370
2371 case SHA_FLAGS_SHA512:
2372 authctx->digestlen = SHA512_DIGEST_SIZE;
2373 break;
2374
2375 default:
2376 return atmel_sha_complete(dd, -EINVAL);
2377 }
2378 if (authctx->digestlen > digestlen)
2379 authctx->digestlen = digestlen;
2380
2381 authctx->cb = cb;
2382 authctx->aes_dev = aes_dev;
2383 authctx->digest = digest;
2384 return atmel_sha_wait_for_data_ready(dd,
2385 atmel_sha_authenc_final_done);
2386}
2387EXPORT_SYMBOL_GPL(atmel_sha_authenc_final);
2388
2389static int atmel_sha_authenc_final_done(struct atmel_sha_dev *dd)
2390{
2391 struct ahash_request *req = dd->req;
2392 struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2393 size_t i, num_words = authctx->digestlen / sizeof(u32);
2394
2395 for (i = 0; i < num_words; ++i)
2396 authctx->digest[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
2397
2398 return atmel_sha_complete(dd, 0);
2399}
2400
2401void atmel_sha_authenc_abort(struct ahash_request *req)
2402{
2403 struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2404 struct atmel_sha_reqctx *ctx = &authctx->base;
2405 struct atmel_sha_dev *dd = ctx->dd;
2406
2407 /* Prevent atmel_sha_complete() from calling req->base.complete(). */
2408 dd->is_async = false;
2409 dd->force_complete = false;
2410 (void)atmel_sha_complete(dd, 0);
2411}
2412EXPORT_SYMBOL_GPL(atmel_sha_authenc_abort);
2413
2414#endif /* CONFIG_CRYPTO_DEV_ATMEL_AUTHENC */
2415
2416
2417static void atmel_sha_unregister_algs(struct atmel_sha_dev *dd)
2418{
2419 int i;
2420
2421 if (dd->caps.has_hmac)
2422 for (i = 0; i < ARRAY_SIZE(sha_hmac_algs); i++)
2423 crypto_unregister_ahash(&sha_hmac_algs[i]);
2424
2425 for (i = 0; i < ARRAY_SIZE(sha_1_256_algs); i++)
2426 crypto_unregister_ahash(&sha_1_256_algs[i]);
2427
2428 if (dd->caps.has_sha224)
2429 crypto_unregister_ahash(&sha_224_alg);
2430
2431 if (dd->caps.has_sha_384_512) {
2432 for (i = 0; i < ARRAY_SIZE(sha_384_512_algs); i++)
2433 crypto_unregister_ahash(&sha_384_512_algs[i]);
2434 }
2435}
2436
2437static int atmel_sha_register_algs(struct atmel_sha_dev *dd)
2438{
2439 int err, i, j;
2440
2441 for (i = 0; i < ARRAY_SIZE(sha_1_256_algs); i++) {
2442 atmel_sha_alg_init(&sha_1_256_algs[i]);
2443
2444 err = crypto_register_ahash(&sha_1_256_algs[i]);
2445 if (err)
2446 goto err_sha_1_256_algs;
2447 }
2448
2449 if (dd->caps.has_sha224) {
2450 atmel_sha_alg_init(&sha_224_alg);
2451
2452 err = crypto_register_ahash(&sha_224_alg);
2453 if (err)
2454 goto err_sha_224_algs;
2455 }
2456
2457 if (dd->caps.has_sha_384_512) {
2458 for (i = 0; i < ARRAY_SIZE(sha_384_512_algs); i++) {
2459 atmel_sha_alg_init(&sha_384_512_algs[i]);
2460
2461 err = crypto_register_ahash(&sha_384_512_algs[i]);
2462 if (err)
2463 goto err_sha_384_512_algs;
2464 }
2465 }
2466
2467 if (dd->caps.has_hmac) {
2468 for (i = 0; i < ARRAY_SIZE(sha_hmac_algs); i++) {
2469 atmel_sha_hmac_alg_init(&sha_hmac_algs[i]);
2470
2471 err = crypto_register_ahash(&sha_hmac_algs[i]);
2472 if (err)
2473 goto err_sha_hmac_algs;
2474 }
2475 }
2476
2477 return 0;
2478
2479 /*i = ARRAY_SIZE(sha_hmac_algs);*/
2480err_sha_hmac_algs:
2481 for (j = 0; j < i; j++)
2482 crypto_unregister_ahash(&sha_hmac_algs[j]);
2483 i = ARRAY_SIZE(sha_384_512_algs);
2484err_sha_384_512_algs:
2485 for (j = 0; j < i; j++)
2486 crypto_unregister_ahash(&sha_384_512_algs[j]);
2487 crypto_unregister_ahash(&sha_224_alg);
2488err_sha_224_algs:
2489 i = ARRAY_SIZE(sha_1_256_algs);
2490err_sha_1_256_algs:
2491 for (j = 0; j < i; j++)
2492 crypto_unregister_ahash(&sha_1_256_algs[j]);
2493
2494 return err;
2495}
2496
2497static int atmel_sha_dma_init(struct atmel_sha_dev *dd)
2498{
2499 dd->dma_lch_in.chan = dma_request_chan(dd->dev, "tx");
2500 if (IS_ERR(dd->dma_lch_in.chan)) {
2501 return dev_err_probe(dd->dev, PTR_ERR(dd->dma_lch_in.chan),
2502 "DMA channel is not available\n");
2503 }
2504
2505 dd->dma_lch_in.dma_conf.dst_addr = dd->phys_base +
2506 SHA_REG_DIN(0);
2507 dd->dma_lch_in.dma_conf.src_maxburst = 1;
2508 dd->dma_lch_in.dma_conf.src_addr_width =
2509 DMA_SLAVE_BUSWIDTH_4_BYTES;
2510 dd->dma_lch_in.dma_conf.dst_maxburst = 1;
2511 dd->dma_lch_in.dma_conf.dst_addr_width =
2512 DMA_SLAVE_BUSWIDTH_4_BYTES;
2513 dd->dma_lch_in.dma_conf.device_fc = false;
2514
2515 return 0;
2516}
2517
2518static void atmel_sha_dma_cleanup(struct atmel_sha_dev *dd)
2519{
2520 dma_release_channel(dd->dma_lch_in.chan);
2521}
2522
2523static void atmel_sha_get_cap(struct atmel_sha_dev *dd)
2524{
2525
2526 dd->caps.has_dma = 0;
2527 dd->caps.has_dualbuff = 0;
2528 dd->caps.has_sha224 = 0;
2529 dd->caps.has_sha_384_512 = 0;
2530 dd->caps.has_uihv = 0;
2531 dd->caps.has_hmac = 0;
2532
2533 /* keep only major version number */
2534 switch (dd->hw_version & 0xff0) {
2535 case 0x700:
2536 case 0x600:
2537 case 0x510:
2538 dd->caps.has_dma = 1;
2539 dd->caps.has_dualbuff = 1;
2540 dd->caps.has_sha224 = 1;
2541 dd->caps.has_sha_384_512 = 1;
2542 dd->caps.has_uihv = 1;
2543 dd->caps.has_hmac = 1;
2544 break;
2545 case 0x420:
2546 dd->caps.has_dma = 1;
2547 dd->caps.has_dualbuff = 1;
2548 dd->caps.has_sha224 = 1;
2549 dd->caps.has_sha_384_512 = 1;
2550 dd->caps.has_uihv = 1;
2551 break;
2552 case 0x410:
2553 dd->caps.has_dma = 1;
2554 dd->caps.has_dualbuff = 1;
2555 dd->caps.has_sha224 = 1;
2556 dd->caps.has_sha_384_512 = 1;
2557 break;
2558 case 0x400:
2559 dd->caps.has_dma = 1;
2560 dd->caps.has_dualbuff = 1;
2561 dd->caps.has_sha224 = 1;
2562 break;
2563 case 0x320:
2564 break;
2565 default:
2566 dev_warn(dd->dev,
2567 "Unmanaged sha version, set minimum capabilities\n");
2568 break;
2569 }
2570}
2571
2572static const struct of_device_id atmel_sha_dt_ids[] = {
2573 { .compatible = "atmel,at91sam9g46-sha" },
2574 { /* sentinel */ }
2575};
2576
2577MODULE_DEVICE_TABLE(of, atmel_sha_dt_ids);
2578
2579static int atmel_sha_probe(struct platform_device *pdev)
2580{
2581 struct atmel_sha_dev *sha_dd;
2582 struct device *dev = &pdev->dev;
2583 struct resource *sha_res;
2584 int err;
2585
2586 sha_dd = devm_kzalloc(&pdev->dev, sizeof(*sha_dd), GFP_KERNEL);
2587 if (!sha_dd)
2588 return -ENOMEM;
2589
2590 sha_dd->dev = dev;
2591
2592 platform_set_drvdata(pdev, sha_dd);
2593
2594 INIT_LIST_HEAD(&sha_dd->list);
2595 spin_lock_init(&sha_dd->lock);
2596
2597 tasklet_init(&sha_dd->done_task, atmel_sha_done_task,
2598 (unsigned long)sha_dd);
2599 tasklet_init(&sha_dd->queue_task, atmel_sha_queue_task,
2600 (unsigned long)sha_dd);
2601
2602 crypto_init_queue(&sha_dd->queue, ATMEL_SHA_QUEUE_LENGTH);
2603
2604 sha_dd->io_base = devm_platform_get_and_ioremap_resource(pdev, 0, &sha_res);
2605 if (IS_ERR(sha_dd->io_base)) {
2606 err = PTR_ERR(sha_dd->io_base);
2607 goto err_tasklet_kill;
2608 }
2609 sha_dd->phys_base = sha_res->start;
2610
2611 /* Get the IRQ */
2612 sha_dd->irq = platform_get_irq(pdev, 0);
2613 if (sha_dd->irq < 0) {
2614 err = sha_dd->irq;
2615 goto err_tasklet_kill;
2616 }
2617
2618 err = devm_request_irq(&pdev->dev, sha_dd->irq, atmel_sha_irq,
2619 IRQF_SHARED, "atmel-sha", sha_dd);
2620 if (err) {
2621 dev_err(dev, "unable to request sha irq.\n");
2622 goto err_tasklet_kill;
2623 }
2624
2625 /* Initializing the clock */
2626 sha_dd->iclk = devm_clk_get(&pdev->dev, "sha_clk");
2627 if (IS_ERR(sha_dd->iclk)) {
2628 dev_err(dev, "clock initialization failed.\n");
2629 err = PTR_ERR(sha_dd->iclk);
2630 goto err_tasklet_kill;
2631 }
2632
2633 err = clk_prepare(sha_dd->iclk);
2634 if (err)
2635 goto err_tasklet_kill;
2636
2637 err = atmel_sha_hw_version_init(sha_dd);
2638 if (err)
2639 goto err_iclk_unprepare;
2640
2641 atmel_sha_get_cap(sha_dd);
2642
2643 if (sha_dd->caps.has_dma) {
2644 err = atmel_sha_dma_init(sha_dd);
2645 if (err)
2646 goto err_iclk_unprepare;
2647
2648 dev_info(dev, "using %s for DMA transfers\n",
2649 dma_chan_name(sha_dd->dma_lch_in.chan));
2650 }
2651
2652 spin_lock(&atmel_sha.lock);
2653 list_add_tail(&sha_dd->list, &atmel_sha.dev_list);
2654 spin_unlock(&atmel_sha.lock);
2655
2656 err = atmel_sha_register_algs(sha_dd);
2657 if (err)
2658 goto err_algs;
2659
2660 dev_info(dev, "Atmel SHA1/SHA256%s%s\n",
2661 sha_dd->caps.has_sha224 ? "/SHA224" : "",
2662 sha_dd->caps.has_sha_384_512 ? "/SHA384/SHA512" : "");
2663
2664 return 0;
2665
2666err_algs:
2667 spin_lock(&atmel_sha.lock);
2668 list_del(&sha_dd->list);
2669 spin_unlock(&atmel_sha.lock);
2670 if (sha_dd->caps.has_dma)
2671 atmel_sha_dma_cleanup(sha_dd);
2672err_iclk_unprepare:
2673 clk_unprepare(sha_dd->iclk);
2674err_tasklet_kill:
2675 tasklet_kill(&sha_dd->queue_task);
2676 tasklet_kill(&sha_dd->done_task);
2677
2678 return err;
2679}
2680
2681static void atmel_sha_remove(struct platform_device *pdev)
2682{
2683 struct atmel_sha_dev *sha_dd = platform_get_drvdata(pdev);
2684
2685 spin_lock(&atmel_sha.lock);
2686 list_del(&sha_dd->list);
2687 spin_unlock(&atmel_sha.lock);
2688
2689 atmel_sha_unregister_algs(sha_dd);
2690
2691 tasklet_kill(&sha_dd->queue_task);
2692 tasklet_kill(&sha_dd->done_task);
2693
2694 if (sha_dd->caps.has_dma)
2695 atmel_sha_dma_cleanup(sha_dd);
2696
2697 clk_unprepare(sha_dd->iclk);
2698}
2699
2700static struct platform_driver atmel_sha_driver = {
2701 .probe = atmel_sha_probe,
2702 .remove_new = atmel_sha_remove,
2703 .driver = {
2704 .name = "atmel_sha",
2705 .of_match_table = atmel_sha_dt_ids,
2706 },
2707};
2708
2709module_platform_driver(atmel_sha_driver);
2710
2711MODULE_DESCRIPTION("Atmel SHA (1/256/224/384/512) hw acceleration support.");
2712MODULE_LICENSE("GPL v2");
2713MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
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#include "atmel-authenc.h"
45
46/* SHA flags */
47#define SHA_FLAGS_BUSY BIT(0)
48#define SHA_FLAGS_FINAL BIT(1)
49#define SHA_FLAGS_DMA_ACTIVE BIT(2)
50#define SHA_FLAGS_OUTPUT_READY BIT(3)
51#define SHA_FLAGS_INIT BIT(4)
52#define SHA_FLAGS_CPU BIT(5)
53#define SHA_FLAGS_DMA_READY BIT(6)
54#define SHA_FLAGS_DUMP_REG BIT(7)
55
56/* bits[11:8] are reserved. */
57
58#define SHA_FLAGS_FINUP BIT(16)
59#define SHA_FLAGS_SG BIT(17)
60#define SHA_FLAGS_ERROR BIT(23)
61#define SHA_FLAGS_PAD BIT(24)
62#define SHA_FLAGS_RESTORE BIT(25)
63#define SHA_FLAGS_IDATAR0 BIT(26)
64#define SHA_FLAGS_WAIT_DATARDY BIT(27)
65
66#define SHA_OP_INIT 0
67#define SHA_OP_UPDATE 1
68#define SHA_OP_FINAL 2
69#define SHA_OP_DIGEST 3
70
71#define SHA_BUFFER_LEN (PAGE_SIZE / 16)
72
73#define ATMEL_SHA_DMA_THRESHOLD 56
74
75struct atmel_sha_caps {
76 bool has_dma;
77 bool has_dualbuff;
78 bool has_sha224;
79 bool has_sha_384_512;
80 bool has_uihv;
81 bool has_hmac;
82};
83
84struct atmel_sha_dev;
85
86/*
87 * .statesize = sizeof(struct atmel_sha_reqctx) must be <= PAGE_SIZE / 8 as
88 * tested by the ahash_prepare_alg() function.
89 */
90struct atmel_sha_reqctx {
91 struct atmel_sha_dev *dd;
92 unsigned long flags;
93 unsigned long op;
94
95 u8 digest[SHA512_DIGEST_SIZE] __aligned(sizeof(u32));
96 u64 digcnt[2];
97 size_t bufcnt;
98 size_t buflen;
99 dma_addr_t dma_addr;
100
101 /* walk state */
102 struct scatterlist *sg;
103 unsigned int offset; /* offset in current sg */
104 unsigned int total; /* total request */
105
106 size_t block_size;
107 size_t hash_size;
108
109 u8 buffer[SHA_BUFFER_LEN + SHA512_BLOCK_SIZE] __aligned(sizeof(u32));
110};
111
112typedef int (*atmel_sha_fn_t)(struct atmel_sha_dev *);
113
114struct atmel_sha_ctx {
115 struct atmel_sha_dev *dd;
116 atmel_sha_fn_t start;
117
118 unsigned long flags;
119};
120
121#define ATMEL_SHA_QUEUE_LENGTH 50
122
123struct atmel_sha_dma {
124 struct dma_chan *chan;
125 struct dma_slave_config dma_conf;
126 struct scatterlist *sg;
127 int nents;
128 unsigned int last_sg_length;
129};
130
131struct atmel_sha_dev {
132 struct list_head list;
133 unsigned long phys_base;
134 struct device *dev;
135 struct clk *iclk;
136 int irq;
137 void __iomem *io_base;
138
139 spinlock_t lock;
140 int err;
141 struct tasklet_struct done_task;
142 struct tasklet_struct queue_task;
143
144 unsigned long flags;
145 struct crypto_queue queue;
146 struct ahash_request *req;
147 bool is_async;
148 bool force_complete;
149 atmel_sha_fn_t resume;
150 atmel_sha_fn_t cpu_transfer_complete;
151
152 struct atmel_sha_dma dma_lch_in;
153
154 struct atmel_sha_caps caps;
155
156 struct scatterlist tmp;
157
158 u32 hw_version;
159};
160
161struct atmel_sha_drv {
162 struct list_head dev_list;
163 spinlock_t lock;
164};
165
166static struct atmel_sha_drv atmel_sha = {
167 .dev_list = LIST_HEAD_INIT(atmel_sha.dev_list),
168 .lock = __SPIN_LOCK_UNLOCKED(atmel_sha.lock),
169};
170
171#ifdef VERBOSE_DEBUG
172static const char *atmel_sha_reg_name(u32 offset, char *tmp, size_t sz, bool wr)
173{
174 switch (offset) {
175 case SHA_CR:
176 return "CR";
177
178 case SHA_MR:
179 return "MR";
180
181 case SHA_IER:
182 return "IER";
183
184 case SHA_IDR:
185 return "IDR";
186
187 case SHA_IMR:
188 return "IMR";
189
190 case SHA_ISR:
191 return "ISR";
192
193 case SHA_MSR:
194 return "MSR";
195
196 case SHA_BCR:
197 return "BCR";
198
199 case SHA_REG_DIN(0):
200 case SHA_REG_DIN(1):
201 case SHA_REG_DIN(2):
202 case SHA_REG_DIN(3):
203 case SHA_REG_DIN(4):
204 case SHA_REG_DIN(5):
205 case SHA_REG_DIN(6):
206 case SHA_REG_DIN(7):
207 case SHA_REG_DIN(8):
208 case SHA_REG_DIN(9):
209 case SHA_REG_DIN(10):
210 case SHA_REG_DIN(11):
211 case SHA_REG_DIN(12):
212 case SHA_REG_DIN(13):
213 case SHA_REG_DIN(14):
214 case SHA_REG_DIN(15):
215 snprintf(tmp, sz, "IDATAR[%u]", (offset - SHA_REG_DIN(0)) >> 2);
216 break;
217
218 case SHA_REG_DIGEST(0):
219 case SHA_REG_DIGEST(1):
220 case SHA_REG_DIGEST(2):
221 case SHA_REG_DIGEST(3):
222 case SHA_REG_DIGEST(4):
223 case SHA_REG_DIGEST(5):
224 case SHA_REG_DIGEST(6):
225 case SHA_REG_DIGEST(7):
226 case SHA_REG_DIGEST(8):
227 case SHA_REG_DIGEST(9):
228 case SHA_REG_DIGEST(10):
229 case SHA_REG_DIGEST(11):
230 case SHA_REG_DIGEST(12):
231 case SHA_REG_DIGEST(13):
232 case SHA_REG_DIGEST(14):
233 case SHA_REG_DIGEST(15):
234 if (wr)
235 snprintf(tmp, sz, "IDATAR[%u]",
236 16u + ((offset - SHA_REG_DIGEST(0)) >> 2));
237 else
238 snprintf(tmp, sz, "ODATAR[%u]",
239 (offset - SHA_REG_DIGEST(0)) >> 2);
240 break;
241
242 case SHA_HW_VERSION:
243 return "HWVER";
244
245 default:
246 snprintf(tmp, sz, "0x%02x", offset);
247 break;
248 }
249
250 return tmp;
251}
252
253#endif /* VERBOSE_DEBUG */
254
255static inline u32 atmel_sha_read(struct atmel_sha_dev *dd, u32 offset)
256{
257 u32 value = readl_relaxed(dd->io_base + offset);
258
259#ifdef VERBOSE_DEBUG
260 if (dd->flags & SHA_FLAGS_DUMP_REG) {
261 char tmp[16];
262
263 dev_vdbg(dd->dev, "read 0x%08x from %s\n", value,
264 atmel_sha_reg_name(offset, tmp, sizeof(tmp), false));
265 }
266#endif /* VERBOSE_DEBUG */
267
268 return value;
269}
270
271static inline void atmel_sha_write(struct atmel_sha_dev *dd,
272 u32 offset, u32 value)
273{
274#ifdef VERBOSE_DEBUG
275 if (dd->flags & SHA_FLAGS_DUMP_REG) {
276 char tmp[16];
277
278 dev_vdbg(dd->dev, "write 0x%08x into %s\n", value,
279 atmel_sha_reg_name(offset, tmp, sizeof(tmp), true));
280 }
281#endif /* VERBOSE_DEBUG */
282
283 writel_relaxed(value, dd->io_base + offset);
284}
285
286static inline int atmel_sha_complete(struct atmel_sha_dev *dd, int err)
287{
288 struct ahash_request *req = dd->req;
289
290 dd->flags &= ~(SHA_FLAGS_BUSY | SHA_FLAGS_FINAL | SHA_FLAGS_CPU |
291 SHA_FLAGS_DMA_READY | SHA_FLAGS_OUTPUT_READY |
292 SHA_FLAGS_DUMP_REG);
293
294 clk_disable(dd->iclk);
295
296 if ((dd->is_async || dd->force_complete) && req->base.complete)
297 req->base.complete(&req->base, err);
298
299 /* handle new request */
300 tasklet_schedule(&dd->queue_task);
301
302 return err;
303}
304
305static size_t atmel_sha_append_sg(struct atmel_sha_reqctx *ctx)
306{
307 size_t count;
308
309 while ((ctx->bufcnt < ctx->buflen) && ctx->total) {
310 count = min(ctx->sg->length - ctx->offset, ctx->total);
311 count = min(count, ctx->buflen - ctx->bufcnt);
312
313 if (count <= 0) {
314 /*
315 * Check if count <= 0 because the buffer is full or
316 * because the sg length is 0. In the latest case,
317 * check if there is another sg in the list, a 0 length
318 * sg doesn't necessarily mean the end of the sg list.
319 */
320 if ((ctx->sg->length == 0) && !sg_is_last(ctx->sg)) {
321 ctx->sg = sg_next(ctx->sg);
322 continue;
323 } else {
324 break;
325 }
326 }
327
328 scatterwalk_map_and_copy(ctx->buffer + ctx->bufcnt, ctx->sg,
329 ctx->offset, count, 0);
330
331 ctx->bufcnt += count;
332 ctx->offset += count;
333 ctx->total -= count;
334
335 if (ctx->offset == ctx->sg->length) {
336 ctx->sg = sg_next(ctx->sg);
337 if (ctx->sg)
338 ctx->offset = 0;
339 else
340 ctx->total = 0;
341 }
342 }
343
344 return 0;
345}
346
347/*
348 * The purpose of this padding is to ensure that the padded message is a
349 * multiple of 512 bits (SHA1/SHA224/SHA256) or 1024 bits (SHA384/SHA512).
350 * The bit "1" is appended at the end of the message followed by
351 * "padlen-1" zero bits. Then a 64 bits block (SHA1/SHA224/SHA256) or
352 * 128 bits block (SHA384/SHA512) equals to the message length in bits
353 * is appended.
354 *
355 * For SHA1/SHA224/SHA256, padlen is calculated as followed:
356 * - if message length < 56 bytes then padlen = 56 - message length
357 * - else padlen = 64 + 56 - message length
358 *
359 * For SHA384/SHA512, padlen is calculated as followed:
360 * - if message length < 112 bytes then padlen = 112 - message length
361 * - else padlen = 128 + 112 - message length
362 */
363static void atmel_sha_fill_padding(struct atmel_sha_reqctx *ctx, int length)
364{
365 unsigned int index, padlen;
366 u64 bits[2];
367 u64 size[2];
368
369 size[0] = ctx->digcnt[0];
370 size[1] = ctx->digcnt[1];
371
372 size[0] += ctx->bufcnt;
373 if (size[0] < ctx->bufcnt)
374 size[1]++;
375
376 size[0] += length;
377 if (size[0] < length)
378 size[1]++;
379
380 bits[1] = cpu_to_be64(size[0] << 3);
381 bits[0] = cpu_to_be64(size[1] << 3 | size[0] >> 61);
382
383 switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
384 case SHA_FLAGS_SHA384:
385 case SHA_FLAGS_SHA512:
386 index = ctx->bufcnt & 0x7f;
387 padlen = (index < 112) ? (112 - index) : ((128+112) - index);
388 *(ctx->buffer + ctx->bufcnt) = 0x80;
389 memset(ctx->buffer + ctx->bufcnt + 1, 0, padlen-1);
390 memcpy(ctx->buffer + ctx->bufcnt + padlen, bits, 16);
391 ctx->bufcnt += padlen + 16;
392 ctx->flags |= SHA_FLAGS_PAD;
393 break;
394
395 default:
396 index = ctx->bufcnt & 0x3f;
397 padlen = (index < 56) ? (56 - index) : ((64+56) - index);
398 *(ctx->buffer + ctx->bufcnt) = 0x80;
399 memset(ctx->buffer + ctx->bufcnt + 1, 0, padlen-1);
400 memcpy(ctx->buffer + ctx->bufcnt + padlen, &bits[1], 8);
401 ctx->bufcnt += padlen + 8;
402 ctx->flags |= SHA_FLAGS_PAD;
403 break;
404 }
405}
406
407static struct atmel_sha_dev *atmel_sha_find_dev(struct atmel_sha_ctx *tctx)
408{
409 struct atmel_sha_dev *dd = NULL;
410 struct atmel_sha_dev *tmp;
411
412 spin_lock_bh(&atmel_sha.lock);
413 if (!tctx->dd) {
414 list_for_each_entry(tmp, &atmel_sha.dev_list, list) {
415 dd = tmp;
416 break;
417 }
418 tctx->dd = dd;
419 } else {
420 dd = tctx->dd;
421 }
422
423 spin_unlock_bh(&atmel_sha.lock);
424
425 return dd;
426}
427
428static int atmel_sha_init(struct ahash_request *req)
429{
430 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
431 struct atmel_sha_ctx *tctx = crypto_ahash_ctx(tfm);
432 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
433 struct atmel_sha_dev *dd = atmel_sha_find_dev(tctx);
434
435 ctx->dd = dd;
436
437 ctx->flags = 0;
438
439 dev_dbg(dd->dev, "init: digest size: %d\n",
440 crypto_ahash_digestsize(tfm));
441
442 switch (crypto_ahash_digestsize(tfm)) {
443 case SHA1_DIGEST_SIZE:
444 ctx->flags |= SHA_FLAGS_SHA1;
445 ctx->block_size = SHA1_BLOCK_SIZE;
446 break;
447 case SHA224_DIGEST_SIZE:
448 ctx->flags |= SHA_FLAGS_SHA224;
449 ctx->block_size = SHA224_BLOCK_SIZE;
450 break;
451 case SHA256_DIGEST_SIZE:
452 ctx->flags |= SHA_FLAGS_SHA256;
453 ctx->block_size = SHA256_BLOCK_SIZE;
454 break;
455 case SHA384_DIGEST_SIZE:
456 ctx->flags |= SHA_FLAGS_SHA384;
457 ctx->block_size = SHA384_BLOCK_SIZE;
458 break;
459 case SHA512_DIGEST_SIZE:
460 ctx->flags |= SHA_FLAGS_SHA512;
461 ctx->block_size = SHA512_BLOCK_SIZE;
462 break;
463 default:
464 return -EINVAL;
465 break;
466 }
467
468 ctx->bufcnt = 0;
469 ctx->digcnt[0] = 0;
470 ctx->digcnt[1] = 0;
471 ctx->buflen = SHA_BUFFER_LEN;
472
473 return 0;
474}
475
476static void atmel_sha_write_ctrl(struct atmel_sha_dev *dd, int dma)
477{
478 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
479 u32 valmr = SHA_MR_MODE_AUTO;
480 unsigned int i, hashsize = 0;
481
482 if (likely(dma)) {
483 if (!dd->caps.has_dma)
484 atmel_sha_write(dd, SHA_IER, SHA_INT_TXBUFE);
485 valmr = SHA_MR_MODE_PDC;
486 if (dd->caps.has_dualbuff)
487 valmr |= SHA_MR_DUALBUFF;
488 } else {
489 atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
490 }
491
492 switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
493 case SHA_FLAGS_SHA1:
494 valmr |= SHA_MR_ALGO_SHA1;
495 hashsize = SHA1_DIGEST_SIZE;
496 break;
497
498 case SHA_FLAGS_SHA224:
499 valmr |= SHA_MR_ALGO_SHA224;
500 hashsize = SHA256_DIGEST_SIZE;
501 break;
502
503 case SHA_FLAGS_SHA256:
504 valmr |= SHA_MR_ALGO_SHA256;
505 hashsize = SHA256_DIGEST_SIZE;
506 break;
507
508 case SHA_FLAGS_SHA384:
509 valmr |= SHA_MR_ALGO_SHA384;
510 hashsize = SHA512_DIGEST_SIZE;
511 break;
512
513 case SHA_FLAGS_SHA512:
514 valmr |= SHA_MR_ALGO_SHA512;
515 hashsize = SHA512_DIGEST_SIZE;
516 break;
517
518 default:
519 break;
520 }
521
522 /* Setting CR_FIRST only for the first iteration */
523 if (!(ctx->digcnt[0] || ctx->digcnt[1])) {
524 atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
525 } else if (dd->caps.has_uihv && (ctx->flags & SHA_FLAGS_RESTORE)) {
526 const u32 *hash = (const u32 *)ctx->digest;
527
528 /*
529 * Restore the hardware context: update the User Initialize
530 * Hash Value (UIHV) with the value saved when the latest
531 * 'update' operation completed on this very same crypto
532 * request.
533 */
534 ctx->flags &= ~SHA_FLAGS_RESTORE;
535 atmel_sha_write(dd, SHA_CR, SHA_CR_WUIHV);
536 for (i = 0; i < hashsize / sizeof(u32); ++i)
537 atmel_sha_write(dd, SHA_REG_DIN(i), hash[i]);
538 atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
539 valmr |= SHA_MR_UIHV;
540 }
541 /*
542 * WARNING: If the UIHV feature is not available, the hardware CANNOT
543 * process concurrent requests: the internal registers used to store
544 * the hash/digest are still set to the partial digest output values
545 * computed during the latest round.
546 */
547
548 atmel_sha_write(dd, SHA_MR, valmr);
549}
550
551static inline int atmel_sha_wait_for_data_ready(struct atmel_sha_dev *dd,
552 atmel_sha_fn_t resume)
553{
554 u32 isr = atmel_sha_read(dd, SHA_ISR);
555
556 if (unlikely(isr & SHA_INT_DATARDY))
557 return resume(dd);
558
559 dd->resume = resume;
560 atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
561 return -EINPROGRESS;
562}
563
564static int atmel_sha_xmit_cpu(struct atmel_sha_dev *dd, const u8 *buf,
565 size_t length, int final)
566{
567 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
568 int count, len32;
569 const u32 *buffer = (const u32 *)buf;
570
571 dev_dbg(dd->dev, "xmit_cpu: digcnt: 0x%llx 0x%llx, length: %zd, final: %d\n",
572 ctx->digcnt[1], ctx->digcnt[0], length, final);
573
574 atmel_sha_write_ctrl(dd, 0);
575
576 /* should be non-zero before next lines to disable clocks later */
577 ctx->digcnt[0] += length;
578 if (ctx->digcnt[0] < length)
579 ctx->digcnt[1]++;
580
581 if (final)
582 dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */
583
584 len32 = DIV_ROUND_UP(length, sizeof(u32));
585
586 dd->flags |= SHA_FLAGS_CPU;
587
588 for (count = 0; count < len32; count++)
589 atmel_sha_write(dd, SHA_REG_DIN(count), buffer[count]);
590
591 return -EINPROGRESS;
592}
593
594static int atmel_sha_xmit_pdc(struct atmel_sha_dev *dd, dma_addr_t dma_addr1,
595 size_t length1, dma_addr_t dma_addr2, size_t length2, int final)
596{
597 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
598 int len32;
599
600 dev_dbg(dd->dev, "xmit_pdc: digcnt: 0x%llx 0x%llx, length: %zd, final: %d\n",
601 ctx->digcnt[1], ctx->digcnt[0], length1, final);
602
603 len32 = DIV_ROUND_UP(length1, sizeof(u32));
604 atmel_sha_write(dd, SHA_PTCR, SHA_PTCR_TXTDIS);
605 atmel_sha_write(dd, SHA_TPR, dma_addr1);
606 atmel_sha_write(dd, SHA_TCR, len32);
607
608 len32 = DIV_ROUND_UP(length2, sizeof(u32));
609 atmel_sha_write(dd, SHA_TNPR, dma_addr2);
610 atmel_sha_write(dd, SHA_TNCR, len32);
611
612 atmel_sha_write_ctrl(dd, 1);
613
614 /* should be non-zero before next lines to disable clocks later */
615 ctx->digcnt[0] += length1;
616 if (ctx->digcnt[0] < length1)
617 ctx->digcnt[1]++;
618
619 if (final)
620 dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */
621
622 dd->flags |= SHA_FLAGS_DMA_ACTIVE;
623
624 /* Start DMA transfer */
625 atmel_sha_write(dd, SHA_PTCR, SHA_PTCR_TXTEN);
626
627 return -EINPROGRESS;
628}
629
630static void atmel_sha_dma_callback(void *data)
631{
632 struct atmel_sha_dev *dd = data;
633
634 dd->is_async = true;
635
636 /* dma_lch_in - completed - wait DATRDY */
637 atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
638}
639
640static int atmel_sha_xmit_dma(struct atmel_sha_dev *dd, dma_addr_t dma_addr1,
641 size_t length1, dma_addr_t dma_addr2, size_t length2, int final)
642{
643 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
644 struct dma_async_tx_descriptor *in_desc;
645 struct scatterlist sg[2];
646
647 dev_dbg(dd->dev, "xmit_dma: digcnt: 0x%llx 0x%llx, length: %zd, final: %d\n",
648 ctx->digcnt[1], ctx->digcnt[0], length1, final);
649
650 dd->dma_lch_in.dma_conf.src_maxburst = 16;
651 dd->dma_lch_in.dma_conf.dst_maxburst = 16;
652
653 dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf);
654
655 if (length2) {
656 sg_init_table(sg, 2);
657 sg_dma_address(&sg[0]) = dma_addr1;
658 sg_dma_len(&sg[0]) = length1;
659 sg_dma_address(&sg[1]) = dma_addr2;
660 sg_dma_len(&sg[1]) = length2;
661 in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, sg, 2,
662 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
663 } else {
664 sg_init_table(sg, 1);
665 sg_dma_address(&sg[0]) = dma_addr1;
666 sg_dma_len(&sg[0]) = length1;
667 in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, sg, 1,
668 DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
669 }
670 if (!in_desc)
671 return atmel_sha_complete(dd, -EINVAL);
672
673 in_desc->callback = atmel_sha_dma_callback;
674 in_desc->callback_param = dd;
675
676 atmel_sha_write_ctrl(dd, 1);
677
678 /* should be non-zero before next lines to disable clocks later */
679 ctx->digcnt[0] += length1;
680 if (ctx->digcnt[0] < length1)
681 ctx->digcnt[1]++;
682
683 if (final)
684 dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */
685
686 dd->flags |= SHA_FLAGS_DMA_ACTIVE;
687
688 /* Start DMA transfer */
689 dmaengine_submit(in_desc);
690 dma_async_issue_pending(dd->dma_lch_in.chan);
691
692 return -EINPROGRESS;
693}
694
695static int atmel_sha_xmit_start(struct atmel_sha_dev *dd, dma_addr_t dma_addr1,
696 size_t length1, dma_addr_t dma_addr2, size_t length2, int final)
697{
698 if (dd->caps.has_dma)
699 return atmel_sha_xmit_dma(dd, dma_addr1, length1,
700 dma_addr2, length2, final);
701 else
702 return atmel_sha_xmit_pdc(dd, dma_addr1, length1,
703 dma_addr2, length2, final);
704}
705
706static int atmel_sha_update_cpu(struct atmel_sha_dev *dd)
707{
708 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
709 int bufcnt;
710
711 atmel_sha_append_sg(ctx);
712 atmel_sha_fill_padding(ctx, 0);
713 bufcnt = ctx->bufcnt;
714 ctx->bufcnt = 0;
715
716 return atmel_sha_xmit_cpu(dd, ctx->buffer, bufcnt, 1);
717}
718
719static int atmel_sha_xmit_dma_map(struct atmel_sha_dev *dd,
720 struct atmel_sha_reqctx *ctx,
721 size_t length, int final)
722{
723 ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer,
724 ctx->buflen + ctx->block_size, DMA_TO_DEVICE);
725 if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
726 dev_err(dd->dev, "dma %zu bytes error\n", ctx->buflen +
727 ctx->block_size);
728 return atmel_sha_complete(dd, -EINVAL);
729 }
730
731 ctx->flags &= ~SHA_FLAGS_SG;
732
733 /* next call does not fail... so no unmap in the case of error */
734 return atmel_sha_xmit_start(dd, ctx->dma_addr, length, 0, 0, final);
735}
736
737static int atmel_sha_update_dma_slow(struct atmel_sha_dev *dd)
738{
739 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
740 unsigned int final;
741 size_t count;
742
743 atmel_sha_append_sg(ctx);
744
745 final = (ctx->flags & SHA_FLAGS_FINUP) && !ctx->total;
746
747 dev_dbg(dd->dev, "slow: bufcnt: %zu, digcnt: 0x%llx 0x%llx, final: %d\n",
748 ctx->bufcnt, ctx->digcnt[1], ctx->digcnt[0], final);
749
750 if (final)
751 atmel_sha_fill_padding(ctx, 0);
752
753 if (final || (ctx->bufcnt == ctx->buflen)) {
754 count = ctx->bufcnt;
755 ctx->bufcnt = 0;
756 return atmel_sha_xmit_dma_map(dd, ctx, count, final);
757 }
758
759 return 0;
760}
761
762static int atmel_sha_update_dma_start(struct atmel_sha_dev *dd)
763{
764 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
765 unsigned int length, final, tail;
766 struct scatterlist *sg;
767 unsigned int count;
768
769 if (!ctx->total)
770 return 0;
771
772 if (ctx->bufcnt || ctx->offset)
773 return atmel_sha_update_dma_slow(dd);
774
775 dev_dbg(dd->dev, "fast: digcnt: 0x%llx 0x%llx, bufcnt: %zd, total: %u\n",
776 ctx->digcnt[1], ctx->digcnt[0], ctx->bufcnt, ctx->total);
777
778 sg = ctx->sg;
779
780 if (!IS_ALIGNED(sg->offset, sizeof(u32)))
781 return atmel_sha_update_dma_slow(dd);
782
783 if (!sg_is_last(sg) && !IS_ALIGNED(sg->length, ctx->block_size))
784 /* size is not ctx->block_size aligned */
785 return atmel_sha_update_dma_slow(dd);
786
787 length = min(ctx->total, sg->length);
788
789 if (sg_is_last(sg)) {
790 if (!(ctx->flags & SHA_FLAGS_FINUP)) {
791 /* not last sg must be ctx->block_size aligned */
792 tail = length & (ctx->block_size - 1);
793 length -= tail;
794 }
795 }
796
797 ctx->total -= length;
798 ctx->offset = length; /* offset where to start slow */
799
800 final = (ctx->flags & SHA_FLAGS_FINUP) && !ctx->total;
801
802 /* Add padding */
803 if (final) {
804 tail = length & (ctx->block_size - 1);
805 length -= tail;
806 ctx->total += tail;
807 ctx->offset = length; /* offset where to start slow */
808
809 sg = ctx->sg;
810 atmel_sha_append_sg(ctx);
811
812 atmel_sha_fill_padding(ctx, length);
813
814 ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer,
815 ctx->buflen + ctx->block_size, DMA_TO_DEVICE);
816 if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
817 dev_err(dd->dev, "dma %zu bytes error\n",
818 ctx->buflen + ctx->block_size);
819 return atmel_sha_complete(dd, -EINVAL);
820 }
821
822 if (length == 0) {
823 ctx->flags &= ~SHA_FLAGS_SG;
824 count = ctx->bufcnt;
825 ctx->bufcnt = 0;
826 return atmel_sha_xmit_start(dd, ctx->dma_addr, count, 0,
827 0, final);
828 } else {
829 ctx->sg = sg;
830 if (!dma_map_sg(dd->dev, ctx->sg, 1,
831 DMA_TO_DEVICE)) {
832 dev_err(dd->dev, "dma_map_sg error\n");
833 return atmel_sha_complete(dd, -EINVAL);
834 }
835
836 ctx->flags |= SHA_FLAGS_SG;
837
838 count = ctx->bufcnt;
839 ctx->bufcnt = 0;
840 return atmel_sha_xmit_start(dd, sg_dma_address(ctx->sg),
841 length, ctx->dma_addr, count, final);
842 }
843 }
844
845 if (!dma_map_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE)) {
846 dev_err(dd->dev, "dma_map_sg error\n");
847 return atmel_sha_complete(dd, -EINVAL);
848 }
849
850 ctx->flags |= SHA_FLAGS_SG;
851
852 /* next call does not fail... so no unmap in the case of error */
853 return atmel_sha_xmit_start(dd, sg_dma_address(ctx->sg), length, 0,
854 0, final);
855}
856
857static int atmel_sha_update_dma_stop(struct atmel_sha_dev *dd)
858{
859 struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
860
861 if (ctx->flags & SHA_FLAGS_SG) {
862 dma_unmap_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE);
863 if (ctx->sg->length == ctx->offset) {
864 ctx->sg = sg_next(ctx->sg);
865 if (ctx->sg)
866 ctx->offset = 0;
867 }
868 if (ctx->flags & SHA_FLAGS_PAD) {
869 dma_unmap_single(dd->dev, ctx->dma_addr,
870 ctx->buflen + ctx->block_size, DMA_TO_DEVICE);
871 }
872 } else {
873 dma_unmap_single(dd->dev, ctx->dma_addr, ctx->buflen +
874 ctx->block_size, DMA_TO_DEVICE);
875 }
876
877 return 0;
878}
879
880static int atmel_sha_update_req(struct atmel_sha_dev *dd)
881{
882 struct ahash_request *req = dd->req;
883 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
884 int err;
885
886 dev_dbg(dd->dev, "update_req: total: %u, digcnt: 0x%llx 0x%llx\n",
887 ctx->total, ctx->digcnt[1], ctx->digcnt[0]);
888
889 if (ctx->flags & SHA_FLAGS_CPU)
890 err = atmel_sha_update_cpu(dd);
891 else
892 err = atmel_sha_update_dma_start(dd);
893
894 /* wait for dma completion before can take more data */
895 dev_dbg(dd->dev, "update: err: %d, digcnt: 0x%llx 0%llx\n",
896 err, ctx->digcnt[1], ctx->digcnt[0]);
897
898 return err;
899}
900
901static int atmel_sha_final_req(struct atmel_sha_dev *dd)
902{
903 struct ahash_request *req = dd->req;
904 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
905 int err = 0;
906 int count;
907
908 if (ctx->bufcnt >= ATMEL_SHA_DMA_THRESHOLD) {
909 atmel_sha_fill_padding(ctx, 0);
910 count = ctx->bufcnt;
911 ctx->bufcnt = 0;
912 err = atmel_sha_xmit_dma_map(dd, ctx, count, 1);
913 }
914 /* faster to handle last block with cpu */
915 else {
916 atmel_sha_fill_padding(ctx, 0);
917 count = ctx->bufcnt;
918 ctx->bufcnt = 0;
919 err = atmel_sha_xmit_cpu(dd, ctx->buffer, count, 1);
920 }
921
922 dev_dbg(dd->dev, "final_req: err: %d\n", err);
923
924 return err;
925}
926
927static void atmel_sha_copy_hash(struct ahash_request *req)
928{
929 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
930 u32 *hash = (u32 *)ctx->digest;
931 unsigned int i, hashsize;
932
933 switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
934 case SHA_FLAGS_SHA1:
935 hashsize = SHA1_DIGEST_SIZE;
936 break;
937
938 case SHA_FLAGS_SHA224:
939 case SHA_FLAGS_SHA256:
940 hashsize = SHA256_DIGEST_SIZE;
941 break;
942
943 case SHA_FLAGS_SHA384:
944 case SHA_FLAGS_SHA512:
945 hashsize = SHA512_DIGEST_SIZE;
946 break;
947
948 default:
949 /* Should not happen... */
950 return;
951 }
952
953 for (i = 0; i < hashsize / sizeof(u32); ++i)
954 hash[i] = atmel_sha_read(ctx->dd, SHA_REG_DIGEST(i));
955 ctx->flags |= SHA_FLAGS_RESTORE;
956}
957
958static void atmel_sha_copy_ready_hash(struct ahash_request *req)
959{
960 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
961
962 if (!req->result)
963 return;
964
965 switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
966 default:
967 case SHA_FLAGS_SHA1:
968 memcpy(req->result, ctx->digest, SHA1_DIGEST_SIZE);
969 break;
970
971 case SHA_FLAGS_SHA224:
972 memcpy(req->result, ctx->digest, SHA224_DIGEST_SIZE);
973 break;
974
975 case SHA_FLAGS_SHA256:
976 memcpy(req->result, ctx->digest, SHA256_DIGEST_SIZE);
977 break;
978
979 case SHA_FLAGS_SHA384:
980 memcpy(req->result, ctx->digest, SHA384_DIGEST_SIZE);
981 break;
982
983 case SHA_FLAGS_SHA512:
984 memcpy(req->result, ctx->digest, SHA512_DIGEST_SIZE);
985 break;
986 }
987}
988
989static int atmel_sha_finish(struct ahash_request *req)
990{
991 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
992 struct atmel_sha_dev *dd = ctx->dd;
993
994 if (ctx->digcnt[0] || ctx->digcnt[1])
995 atmel_sha_copy_ready_hash(req);
996
997 dev_dbg(dd->dev, "digcnt: 0x%llx 0x%llx, bufcnt: %zd\n", ctx->digcnt[1],
998 ctx->digcnt[0], ctx->bufcnt);
999
1000 return 0;
1001}
1002
1003static void atmel_sha_finish_req(struct ahash_request *req, int err)
1004{
1005 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1006 struct atmel_sha_dev *dd = ctx->dd;
1007
1008 if (!err) {
1009 atmel_sha_copy_hash(req);
1010 if (SHA_FLAGS_FINAL & dd->flags)
1011 err = atmel_sha_finish(req);
1012 } else {
1013 ctx->flags |= SHA_FLAGS_ERROR;
1014 }
1015
1016 /* atomic operation is not needed here */
1017 (void)atmel_sha_complete(dd, err);
1018}
1019
1020static int atmel_sha_hw_init(struct atmel_sha_dev *dd)
1021{
1022 int err;
1023
1024 err = clk_enable(dd->iclk);
1025 if (err)
1026 return err;
1027
1028 if (!(SHA_FLAGS_INIT & dd->flags)) {
1029 atmel_sha_write(dd, SHA_CR, SHA_CR_SWRST);
1030 dd->flags |= SHA_FLAGS_INIT;
1031 dd->err = 0;
1032 }
1033
1034 return 0;
1035}
1036
1037static inline unsigned int atmel_sha_get_version(struct atmel_sha_dev *dd)
1038{
1039 return atmel_sha_read(dd, SHA_HW_VERSION) & 0x00000fff;
1040}
1041
1042static void atmel_sha_hw_version_init(struct atmel_sha_dev *dd)
1043{
1044 atmel_sha_hw_init(dd);
1045
1046 dd->hw_version = atmel_sha_get_version(dd);
1047
1048 dev_info(dd->dev,
1049 "version: 0x%x\n", dd->hw_version);
1050
1051 clk_disable(dd->iclk);
1052}
1053
1054static int atmel_sha_handle_queue(struct atmel_sha_dev *dd,
1055 struct ahash_request *req)
1056{
1057 struct crypto_async_request *async_req, *backlog;
1058 struct atmel_sha_ctx *ctx;
1059 unsigned long flags;
1060 bool start_async;
1061 int err = 0, ret = 0;
1062
1063 spin_lock_irqsave(&dd->lock, flags);
1064 if (req)
1065 ret = ahash_enqueue_request(&dd->queue, req);
1066
1067 if (SHA_FLAGS_BUSY & dd->flags) {
1068 spin_unlock_irqrestore(&dd->lock, flags);
1069 return ret;
1070 }
1071
1072 backlog = crypto_get_backlog(&dd->queue);
1073 async_req = crypto_dequeue_request(&dd->queue);
1074 if (async_req)
1075 dd->flags |= SHA_FLAGS_BUSY;
1076
1077 spin_unlock_irqrestore(&dd->lock, flags);
1078
1079 if (!async_req)
1080 return ret;
1081
1082 if (backlog)
1083 backlog->complete(backlog, -EINPROGRESS);
1084
1085 ctx = crypto_tfm_ctx(async_req->tfm);
1086
1087 dd->req = ahash_request_cast(async_req);
1088 start_async = (dd->req != req);
1089 dd->is_async = start_async;
1090 dd->force_complete = false;
1091
1092 /* WARNING: ctx->start() MAY change dd->is_async. */
1093 err = ctx->start(dd);
1094 return (start_async) ? ret : err;
1095}
1096
1097static int atmel_sha_done(struct atmel_sha_dev *dd);
1098
1099static int atmel_sha_start(struct atmel_sha_dev *dd)
1100{
1101 struct ahash_request *req = dd->req;
1102 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1103 int err;
1104
1105 dev_dbg(dd->dev, "handling new req, op: %lu, nbytes: %d\n",
1106 ctx->op, req->nbytes);
1107
1108 err = atmel_sha_hw_init(dd);
1109 if (err)
1110 return atmel_sha_complete(dd, err);
1111
1112 /*
1113 * atmel_sha_update_req() and atmel_sha_final_req() can return either:
1114 * -EINPROGRESS: the hardware is busy and the SHA driver will resume
1115 * its job later in the done_task.
1116 * This is the main path.
1117 *
1118 * 0: the SHA driver can continue its job then release the hardware
1119 * later, if needed, with atmel_sha_finish_req().
1120 * This is the alternate path.
1121 *
1122 * < 0: an error has occurred so atmel_sha_complete(dd, err) has already
1123 * been called, hence the hardware has been released.
1124 * The SHA driver must stop its job without calling
1125 * atmel_sha_finish_req(), otherwise atmel_sha_complete() would be
1126 * called a second time.
1127 *
1128 * Please note that currently, atmel_sha_final_req() never returns 0.
1129 */
1130
1131 dd->resume = atmel_sha_done;
1132 if (ctx->op == SHA_OP_UPDATE) {
1133 err = atmel_sha_update_req(dd);
1134 if (!err && (ctx->flags & SHA_FLAGS_FINUP))
1135 /* no final() after finup() */
1136 err = atmel_sha_final_req(dd);
1137 } else if (ctx->op == SHA_OP_FINAL) {
1138 err = atmel_sha_final_req(dd);
1139 }
1140
1141 if (!err)
1142 /* done_task will not finish it, so do it here */
1143 atmel_sha_finish_req(req, err);
1144
1145 dev_dbg(dd->dev, "exit, err: %d\n", err);
1146
1147 return err;
1148}
1149
1150static int atmel_sha_enqueue(struct ahash_request *req, unsigned int op)
1151{
1152 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1153 struct atmel_sha_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
1154 struct atmel_sha_dev *dd = tctx->dd;
1155
1156 ctx->op = op;
1157
1158 return atmel_sha_handle_queue(dd, req);
1159}
1160
1161static int atmel_sha_update(struct ahash_request *req)
1162{
1163 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1164
1165 if (!req->nbytes)
1166 return 0;
1167
1168 ctx->total = req->nbytes;
1169 ctx->sg = req->src;
1170 ctx->offset = 0;
1171
1172 if (ctx->flags & SHA_FLAGS_FINUP) {
1173 if (ctx->bufcnt + ctx->total < ATMEL_SHA_DMA_THRESHOLD)
1174 /* faster to use CPU for short transfers */
1175 ctx->flags |= SHA_FLAGS_CPU;
1176 } else if (ctx->bufcnt + ctx->total < ctx->buflen) {
1177 atmel_sha_append_sg(ctx);
1178 return 0;
1179 }
1180 return atmel_sha_enqueue(req, SHA_OP_UPDATE);
1181}
1182
1183static int atmel_sha_final(struct ahash_request *req)
1184{
1185 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1186
1187 ctx->flags |= SHA_FLAGS_FINUP;
1188
1189 if (ctx->flags & SHA_FLAGS_ERROR)
1190 return 0; /* uncompleted hash is not needed */
1191
1192 if (ctx->flags & SHA_FLAGS_PAD)
1193 /* copy ready hash (+ finalize hmac) */
1194 return atmel_sha_finish(req);
1195
1196 return atmel_sha_enqueue(req, SHA_OP_FINAL);
1197}
1198
1199static int atmel_sha_finup(struct ahash_request *req)
1200{
1201 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1202 int err1, err2;
1203
1204 ctx->flags |= SHA_FLAGS_FINUP;
1205
1206 err1 = atmel_sha_update(req);
1207 if (err1 == -EINPROGRESS ||
1208 (err1 == -EBUSY && (ahash_request_flags(req) &
1209 CRYPTO_TFM_REQ_MAY_BACKLOG)))
1210 return err1;
1211
1212 /*
1213 * final() has to be always called to cleanup resources
1214 * even if udpate() failed, except EINPROGRESS
1215 */
1216 err2 = atmel_sha_final(req);
1217
1218 return err1 ?: err2;
1219}
1220
1221static int atmel_sha_digest(struct ahash_request *req)
1222{
1223 return atmel_sha_init(req) ?: atmel_sha_finup(req);
1224}
1225
1226
1227static int atmel_sha_export(struct ahash_request *req, void *out)
1228{
1229 const struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1230
1231 memcpy(out, ctx, sizeof(*ctx));
1232 return 0;
1233}
1234
1235static int atmel_sha_import(struct ahash_request *req, const void *in)
1236{
1237 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1238
1239 memcpy(ctx, in, sizeof(*ctx));
1240 return 0;
1241}
1242
1243static int atmel_sha_cra_init(struct crypto_tfm *tfm)
1244{
1245 struct atmel_sha_ctx *ctx = crypto_tfm_ctx(tfm);
1246
1247 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
1248 sizeof(struct atmel_sha_reqctx));
1249 ctx->start = atmel_sha_start;
1250
1251 return 0;
1252}
1253
1254static struct ahash_alg sha_1_256_algs[] = {
1255{
1256 .init = atmel_sha_init,
1257 .update = atmel_sha_update,
1258 .final = atmel_sha_final,
1259 .finup = atmel_sha_finup,
1260 .digest = atmel_sha_digest,
1261 .export = atmel_sha_export,
1262 .import = atmel_sha_import,
1263 .halg = {
1264 .digestsize = SHA1_DIGEST_SIZE,
1265 .statesize = sizeof(struct atmel_sha_reqctx),
1266 .base = {
1267 .cra_name = "sha1",
1268 .cra_driver_name = "atmel-sha1",
1269 .cra_priority = 100,
1270 .cra_flags = CRYPTO_ALG_ASYNC,
1271 .cra_blocksize = SHA1_BLOCK_SIZE,
1272 .cra_ctxsize = sizeof(struct atmel_sha_ctx),
1273 .cra_alignmask = 0,
1274 .cra_module = THIS_MODULE,
1275 .cra_init = atmel_sha_cra_init,
1276 }
1277 }
1278},
1279{
1280 .init = atmel_sha_init,
1281 .update = atmel_sha_update,
1282 .final = atmel_sha_final,
1283 .finup = atmel_sha_finup,
1284 .digest = atmel_sha_digest,
1285 .export = atmel_sha_export,
1286 .import = atmel_sha_import,
1287 .halg = {
1288 .digestsize = SHA256_DIGEST_SIZE,
1289 .statesize = sizeof(struct atmel_sha_reqctx),
1290 .base = {
1291 .cra_name = "sha256",
1292 .cra_driver_name = "atmel-sha256",
1293 .cra_priority = 100,
1294 .cra_flags = CRYPTO_ALG_ASYNC,
1295 .cra_blocksize = SHA256_BLOCK_SIZE,
1296 .cra_ctxsize = sizeof(struct atmel_sha_ctx),
1297 .cra_alignmask = 0,
1298 .cra_module = THIS_MODULE,
1299 .cra_init = atmel_sha_cra_init,
1300 }
1301 }
1302},
1303};
1304
1305static struct ahash_alg sha_224_alg = {
1306 .init = atmel_sha_init,
1307 .update = atmel_sha_update,
1308 .final = atmel_sha_final,
1309 .finup = atmel_sha_finup,
1310 .digest = atmel_sha_digest,
1311 .export = atmel_sha_export,
1312 .import = atmel_sha_import,
1313 .halg = {
1314 .digestsize = SHA224_DIGEST_SIZE,
1315 .statesize = sizeof(struct atmel_sha_reqctx),
1316 .base = {
1317 .cra_name = "sha224",
1318 .cra_driver_name = "atmel-sha224",
1319 .cra_priority = 100,
1320 .cra_flags = CRYPTO_ALG_ASYNC,
1321 .cra_blocksize = SHA224_BLOCK_SIZE,
1322 .cra_ctxsize = sizeof(struct atmel_sha_ctx),
1323 .cra_alignmask = 0,
1324 .cra_module = THIS_MODULE,
1325 .cra_init = atmel_sha_cra_init,
1326 }
1327 }
1328};
1329
1330static struct ahash_alg sha_384_512_algs[] = {
1331{
1332 .init = atmel_sha_init,
1333 .update = atmel_sha_update,
1334 .final = atmel_sha_final,
1335 .finup = atmel_sha_finup,
1336 .digest = atmel_sha_digest,
1337 .export = atmel_sha_export,
1338 .import = atmel_sha_import,
1339 .halg = {
1340 .digestsize = SHA384_DIGEST_SIZE,
1341 .statesize = sizeof(struct atmel_sha_reqctx),
1342 .base = {
1343 .cra_name = "sha384",
1344 .cra_driver_name = "atmel-sha384",
1345 .cra_priority = 100,
1346 .cra_flags = CRYPTO_ALG_ASYNC,
1347 .cra_blocksize = SHA384_BLOCK_SIZE,
1348 .cra_ctxsize = sizeof(struct atmel_sha_ctx),
1349 .cra_alignmask = 0x3,
1350 .cra_module = THIS_MODULE,
1351 .cra_init = atmel_sha_cra_init,
1352 }
1353 }
1354},
1355{
1356 .init = atmel_sha_init,
1357 .update = atmel_sha_update,
1358 .final = atmel_sha_final,
1359 .finup = atmel_sha_finup,
1360 .digest = atmel_sha_digest,
1361 .export = atmel_sha_export,
1362 .import = atmel_sha_import,
1363 .halg = {
1364 .digestsize = SHA512_DIGEST_SIZE,
1365 .statesize = sizeof(struct atmel_sha_reqctx),
1366 .base = {
1367 .cra_name = "sha512",
1368 .cra_driver_name = "atmel-sha512",
1369 .cra_priority = 100,
1370 .cra_flags = CRYPTO_ALG_ASYNC,
1371 .cra_blocksize = SHA512_BLOCK_SIZE,
1372 .cra_ctxsize = sizeof(struct atmel_sha_ctx),
1373 .cra_alignmask = 0x3,
1374 .cra_module = THIS_MODULE,
1375 .cra_init = atmel_sha_cra_init,
1376 }
1377 }
1378},
1379};
1380
1381static void atmel_sha_queue_task(unsigned long data)
1382{
1383 struct atmel_sha_dev *dd = (struct atmel_sha_dev *)data;
1384
1385 atmel_sha_handle_queue(dd, NULL);
1386}
1387
1388static int atmel_sha_done(struct atmel_sha_dev *dd)
1389{
1390 int err = 0;
1391
1392 if (SHA_FLAGS_CPU & dd->flags) {
1393 if (SHA_FLAGS_OUTPUT_READY & dd->flags) {
1394 dd->flags &= ~SHA_FLAGS_OUTPUT_READY;
1395 goto finish;
1396 }
1397 } else if (SHA_FLAGS_DMA_READY & dd->flags) {
1398 if (SHA_FLAGS_DMA_ACTIVE & dd->flags) {
1399 dd->flags &= ~SHA_FLAGS_DMA_ACTIVE;
1400 atmel_sha_update_dma_stop(dd);
1401 if (dd->err) {
1402 err = dd->err;
1403 goto finish;
1404 }
1405 }
1406 if (SHA_FLAGS_OUTPUT_READY & dd->flags) {
1407 /* hash or semi-hash ready */
1408 dd->flags &= ~(SHA_FLAGS_DMA_READY |
1409 SHA_FLAGS_OUTPUT_READY);
1410 err = atmel_sha_update_dma_start(dd);
1411 if (err != -EINPROGRESS)
1412 goto finish;
1413 }
1414 }
1415 return err;
1416
1417finish:
1418 /* finish curent request */
1419 atmel_sha_finish_req(dd->req, err);
1420
1421 return err;
1422}
1423
1424static void atmel_sha_done_task(unsigned long data)
1425{
1426 struct atmel_sha_dev *dd = (struct atmel_sha_dev *)data;
1427
1428 dd->is_async = true;
1429 (void)dd->resume(dd);
1430}
1431
1432static irqreturn_t atmel_sha_irq(int irq, void *dev_id)
1433{
1434 struct atmel_sha_dev *sha_dd = dev_id;
1435 u32 reg;
1436
1437 reg = atmel_sha_read(sha_dd, SHA_ISR);
1438 if (reg & atmel_sha_read(sha_dd, SHA_IMR)) {
1439 atmel_sha_write(sha_dd, SHA_IDR, reg);
1440 if (SHA_FLAGS_BUSY & sha_dd->flags) {
1441 sha_dd->flags |= SHA_FLAGS_OUTPUT_READY;
1442 if (!(SHA_FLAGS_CPU & sha_dd->flags))
1443 sha_dd->flags |= SHA_FLAGS_DMA_READY;
1444 tasklet_schedule(&sha_dd->done_task);
1445 } else {
1446 dev_warn(sha_dd->dev, "SHA interrupt when no active requests.\n");
1447 }
1448 return IRQ_HANDLED;
1449 }
1450
1451 return IRQ_NONE;
1452}
1453
1454
1455/* DMA transfer functions */
1456
1457static bool atmel_sha_dma_check_aligned(struct atmel_sha_dev *dd,
1458 struct scatterlist *sg,
1459 size_t len)
1460{
1461 struct atmel_sha_dma *dma = &dd->dma_lch_in;
1462 struct ahash_request *req = dd->req;
1463 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1464 size_t bs = ctx->block_size;
1465 int nents;
1466
1467 for (nents = 0; sg; sg = sg_next(sg), ++nents) {
1468 if (!IS_ALIGNED(sg->offset, sizeof(u32)))
1469 return false;
1470
1471 /*
1472 * This is the last sg, the only one that is allowed to
1473 * have an unaligned length.
1474 */
1475 if (len <= sg->length) {
1476 dma->nents = nents + 1;
1477 dma->last_sg_length = sg->length;
1478 sg->length = ALIGN(len, sizeof(u32));
1479 return true;
1480 }
1481
1482 /* All other sg lengths MUST be aligned to the block size. */
1483 if (!IS_ALIGNED(sg->length, bs))
1484 return false;
1485
1486 len -= sg->length;
1487 }
1488
1489 return false;
1490}
1491
1492static void atmel_sha_dma_callback2(void *data)
1493{
1494 struct atmel_sha_dev *dd = data;
1495 struct atmel_sha_dma *dma = &dd->dma_lch_in;
1496 struct scatterlist *sg;
1497 int nents;
1498
1499 dmaengine_terminate_all(dma->chan);
1500 dma_unmap_sg(dd->dev, dma->sg, dma->nents, DMA_TO_DEVICE);
1501
1502 sg = dma->sg;
1503 for (nents = 0; nents < dma->nents - 1; ++nents)
1504 sg = sg_next(sg);
1505 sg->length = dma->last_sg_length;
1506
1507 dd->is_async = true;
1508 (void)atmel_sha_wait_for_data_ready(dd, dd->resume);
1509}
1510
1511static int atmel_sha_dma_start(struct atmel_sha_dev *dd,
1512 struct scatterlist *src,
1513 size_t len,
1514 atmel_sha_fn_t resume)
1515{
1516 struct atmel_sha_dma *dma = &dd->dma_lch_in;
1517 struct dma_slave_config *config = &dma->dma_conf;
1518 struct dma_chan *chan = dma->chan;
1519 struct dma_async_tx_descriptor *desc;
1520 dma_cookie_t cookie;
1521 unsigned int sg_len;
1522 int err;
1523
1524 dd->resume = resume;
1525
1526 /*
1527 * dma->nents has already been initialized by
1528 * atmel_sha_dma_check_aligned().
1529 */
1530 dma->sg = src;
1531 sg_len = dma_map_sg(dd->dev, dma->sg, dma->nents, DMA_TO_DEVICE);
1532 if (!sg_len) {
1533 err = -ENOMEM;
1534 goto exit;
1535 }
1536
1537 config->src_maxburst = 16;
1538 config->dst_maxburst = 16;
1539 err = dmaengine_slave_config(chan, config);
1540 if (err)
1541 goto unmap_sg;
1542
1543 desc = dmaengine_prep_slave_sg(chan, dma->sg, sg_len, DMA_MEM_TO_DEV,
1544 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
1545 if (!desc) {
1546 err = -ENOMEM;
1547 goto unmap_sg;
1548 }
1549
1550 desc->callback = atmel_sha_dma_callback2;
1551 desc->callback_param = dd;
1552 cookie = dmaengine_submit(desc);
1553 err = dma_submit_error(cookie);
1554 if (err)
1555 goto unmap_sg;
1556
1557 dma_async_issue_pending(chan);
1558
1559 return -EINPROGRESS;
1560
1561unmap_sg:
1562 dma_unmap_sg(dd->dev, dma->sg, dma->nents, DMA_TO_DEVICE);
1563exit:
1564 return atmel_sha_complete(dd, err);
1565}
1566
1567
1568/* CPU transfer functions */
1569
1570static int atmel_sha_cpu_transfer(struct atmel_sha_dev *dd)
1571{
1572 struct ahash_request *req = dd->req;
1573 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1574 const u32 *words = (const u32 *)ctx->buffer;
1575 size_t i, num_words;
1576 u32 isr, din, din_inc;
1577
1578 din_inc = (ctx->flags & SHA_FLAGS_IDATAR0) ? 0 : 1;
1579 for (;;) {
1580 /* Write data into the Input Data Registers. */
1581 num_words = DIV_ROUND_UP(ctx->bufcnt, sizeof(u32));
1582 for (i = 0, din = 0; i < num_words; ++i, din += din_inc)
1583 atmel_sha_write(dd, SHA_REG_DIN(din), words[i]);
1584
1585 ctx->offset += ctx->bufcnt;
1586 ctx->total -= ctx->bufcnt;
1587
1588 if (!ctx->total)
1589 break;
1590
1591 /*
1592 * Prepare next block:
1593 * Fill ctx->buffer now with the next data to be written into
1594 * IDATARx: it gives time for the SHA hardware to process
1595 * the current data so the SHA_INT_DATARDY flag might be set
1596 * in SHA_ISR when polling this register at the beginning of
1597 * the next loop.
1598 */
1599 ctx->bufcnt = min_t(size_t, ctx->block_size, ctx->total);
1600 scatterwalk_map_and_copy(ctx->buffer, ctx->sg,
1601 ctx->offset, ctx->bufcnt, 0);
1602
1603 /* Wait for hardware to be ready again. */
1604 isr = atmel_sha_read(dd, SHA_ISR);
1605 if (!(isr & SHA_INT_DATARDY)) {
1606 /* Not ready yet. */
1607 dd->resume = atmel_sha_cpu_transfer;
1608 atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
1609 return -EINPROGRESS;
1610 }
1611 }
1612
1613 if (unlikely(!(ctx->flags & SHA_FLAGS_WAIT_DATARDY)))
1614 return dd->cpu_transfer_complete(dd);
1615
1616 return atmel_sha_wait_for_data_ready(dd, dd->cpu_transfer_complete);
1617}
1618
1619static int atmel_sha_cpu_start(struct atmel_sha_dev *dd,
1620 struct scatterlist *sg,
1621 unsigned int len,
1622 bool idatar0_only,
1623 bool wait_data_ready,
1624 atmel_sha_fn_t resume)
1625{
1626 struct ahash_request *req = dd->req;
1627 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1628
1629 if (!len)
1630 return resume(dd);
1631
1632 ctx->flags &= ~(SHA_FLAGS_IDATAR0 | SHA_FLAGS_WAIT_DATARDY);
1633
1634 if (idatar0_only)
1635 ctx->flags |= SHA_FLAGS_IDATAR0;
1636
1637 if (wait_data_ready)
1638 ctx->flags |= SHA_FLAGS_WAIT_DATARDY;
1639
1640 ctx->sg = sg;
1641 ctx->total = len;
1642 ctx->offset = 0;
1643
1644 /* Prepare the first block to be written. */
1645 ctx->bufcnt = min_t(size_t, ctx->block_size, ctx->total);
1646 scatterwalk_map_and_copy(ctx->buffer, ctx->sg,
1647 ctx->offset, ctx->bufcnt, 0);
1648
1649 dd->cpu_transfer_complete = resume;
1650 return atmel_sha_cpu_transfer(dd);
1651}
1652
1653static int atmel_sha_cpu_hash(struct atmel_sha_dev *dd,
1654 const void *data, unsigned int datalen,
1655 bool auto_padding,
1656 atmel_sha_fn_t resume)
1657{
1658 struct ahash_request *req = dd->req;
1659 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1660 u32 msglen = (auto_padding) ? datalen : 0;
1661 u32 mr = SHA_MR_MODE_AUTO;
1662
1663 if (!(IS_ALIGNED(datalen, ctx->block_size) || auto_padding))
1664 return atmel_sha_complete(dd, -EINVAL);
1665
1666 mr |= (ctx->flags & SHA_FLAGS_ALGO_MASK);
1667 atmel_sha_write(dd, SHA_MR, mr);
1668 atmel_sha_write(dd, SHA_MSR, msglen);
1669 atmel_sha_write(dd, SHA_BCR, msglen);
1670 atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
1671
1672 sg_init_one(&dd->tmp, data, datalen);
1673 return atmel_sha_cpu_start(dd, &dd->tmp, datalen, false, true, resume);
1674}
1675
1676
1677/* hmac functions */
1678
1679struct atmel_sha_hmac_key {
1680 bool valid;
1681 unsigned int keylen;
1682 u8 buffer[SHA512_BLOCK_SIZE];
1683 u8 *keydup;
1684};
1685
1686static inline void atmel_sha_hmac_key_init(struct atmel_sha_hmac_key *hkey)
1687{
1688 memset(hkey, 0, sizeof(*hkey));
1689}
1690
1691static inline void atmel_sha_hmac_key_release(struct atmel_sha_hmac_key *hkey)
1692{
1693 kfree(hkey->keydup);
1694 memset(hkey, 0, sizeof(*hkey));
1695}
1696
1697static inline int atmel_sha_hmac_key_set(struct atmel_sha_hmac_key *hkey,
1698 const u8 *key,
1699 unsigned int keylen)
1700{
1701 atmel_sha_hmac_key_release(hkey);
1702
1703 if (keylen > sizeof(hkey->buffer)) {
1704 hkey->keydup = kmemdup(key, keylen, GFP_KERNEL);
1705 if (!hkey->keydup)
1706 return -ENOMEM;
1707
1708 } else {
1709 memcpy(hkey->buffer, key, keylen);
1710 }
1711
1712 hkey->valid = true;
1713 hkey->keylen = keylen;
1714 return 0;
1715}
1716
1717static inline bool atmel_sha_hmac_key_get(const struct atmel_sha_hmac_key *hkey,
1718 const u8 **key,
1719 unsigned int *keylen)
1720{
1721 if (!hkey->valid)
1722 return false;
1723
1724 *keylen = hkey->keylen;
1725 *key = (hkey->keydup) ? hkey->keydup : hkey->buffer;
1726 return true;
1727}
1728
1729
1730struct atmel_sha_hmac_ctx {
1731 struct atmel_sha_ctx base;
1732
1733 struct atmel_sha_hmac_key hkey;
1734 u32 ipad[SHA512_BLOCK_SIZE / sizeof(u32)];
1735 u32 opad[SHA512_BLOCK_SIZE / sizeof(u32)];
1736 atmel_sha_fn_t resume;
1737};
1738
1739static int atmel_sha_hmac_setup(struct atmel_sha_dev *dd,
1740 atmel_sha_fn_t resume);
1741static int atmel_sha_hmac_prehash_key(struct atmel_sha_dev *dd,
1742 const u8 *key, unsigned int keylen);
1743static int atmel_sha_hmac_prehash_key_done(struct atmel_sha_dev *dd);
1744static int atmel_sha_hmac_compute_ipad_hash(struct atmel_sha_dev *dd);
1745static int atmel_sha_hmac_compute_opad_hash(struct atmel_sha_dev *dd);
1746static int atmel_sha_hmac_setup_done(struct atmel_sha_dev *dd);
1747
1748static int atmel_sha_hmac_init_done(struct atmel_sha_dev *dd);
1749static int atmel_sha_hmac_final(struct atmel_sha_dev *dd);
1750static int atmel_sha_hmac_final_done(struct atmel_sha_dev *dd);
1751static int atmel_sha_hmac_digest2(struct atmel_sha_dev *dd);
1752
1753static int atmel_sha_hmac_setup(struct atmel_sha_dev *dd,
1754 atmel_sha_fn_t resume)
1755{
1756 struct ahash_request *req = dd->req;
1757 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1758 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1759 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1760 unsigned int keylen;
1761 const u8 *key;
1762 size_t bs;
1763
1764 hmac->resume = resume;
1765 switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
1766 case SHA_FLAGS_SHA1:
1767 ctx->block_size = SHA1_BLOCK_SIZE;
1768 ctx->hash_size = SHA1_DIGEST_SIZE;
1769 break;
1770
1771 case SHA_FLAGS_SHA224:
1772 ctx->block_size = SHA224_BLOCK_SIZE;
1773 ctx->hash_size = SHA256_DIGEST_SIZE;
1774 break;
1775
1776 case SHA_FLAGS_SHA256:
1777 ctx->block_size = SHA256_BLOCK_SIZE;
1778 ctx->hash_size = SHA256_DIGEST_SIZE;
1779 break;
1780
1781 case SHA_FLAGS_SHA384:
1782 ctx->block_size = SHA384_BLOCK_SIZE;
1783 ctx->hash_size = SHA512_DIGEST_SIZE;
1784 break;
1785
1786 case SHA_FLAGS_SHA512:
1787 ctx->block_size = SHA512_BLOCK_SIZE;
1788 ctx->hash_size = SHA512_DIGEST_SIZE;
1789 break;
1790
1791 default:
1792 return atmel_sha_complete(dd, -EINVAL);
1793 }
1794 bs = ctx->block_size;
1795
1796 if (likely(!atmel_sha_hmac_key_get(&hmac->hkey, &key, &keylen)))
1797 return resume(dd);
1798
1799 /* Compute K' from K. */
1800 if (unlikely(keylen > bs))
1801 return atmel_sha_hmac_prehash_key(dd, key, keylen);
1802
1803 /* Prepare ipad. */
1804 memcpy((u8 *)hmac->ipad, key, keylen);
1805 memset((u8 *)hmac->ipad + keylen, 0, bs - keylen);
1806 return atmel_sha_hmac_compute_ipad_hash(dd);
1807}
1808
1809static int atmel_sha_hmac_prehash_key(struct atmel_sha_dev *dd,
1810 const u8 *key, unsigned int keylen)
1811{
1812 return atmel_sha_cpu_hash(dd, key, keylen, true,
1813 atmel_sha_hmac_prehash_key_done);
1814}
1815
1816static int atmel_sha_hmac_prehash_key_done(struct atmel_sha_dev *dd)
1817{
1818 struct ahash_request *req = dd->req;
1819 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1820 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1821 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1822 size_t ds = crypto_ahash_digestsize(tfm);
1823 size_t bs = ctx->block_size;
1824 size_t i, num_words = ds / sizeof(u32);
1825
1826 /* Prepare ipad. */
1827 for (i = 0; i < num_words; ++i)
1828 hmac->ipad[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
1829 memset((u8 *)hmac->ipad + ds, 0, bs - ds);
1830 return atmel_sha_hmac_compute_ipad_hash(dd);
1831}
1832
1833static int atmel_sha_hmac_compute_ipad_hash(struct atmel_sha_dev *dd)
1834{
1835 struct ahash_request *req = dd->req;
1836 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1837 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1838 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1839 size_t bs = ctx->block_size;
1840 size_t i, num_words = bs / sizeof(u32);
1841
1842 memcpy(hmac->opad, hmac->ipad, bs);
1843 for (i = 0; i < num_words; ++i) {
1844 hmac->ipad[i] ^= 0x36363636;
1845 hmac->opad[i] ^= 0x5c5c5c5c;
1846 }
1847
1848 return atmel_sha_cpu_hash(dd, hmac->ipad, bs, false,
1849 atmel_sha_hmac_compute_opad_hash);
1850}
1851
1852static int atmel_sha_hmac_compute_opad_hash(struct atmel_sha_dev *dd)
1853{
1854 struct ahash_request *req = dd->req;
1855 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1856 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1857 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1858 size_t bs = ctx->block_size;
1859 size_t hs = ctx->hash_size;
1860 size_t i, num_words = hs / sizeof(u32);
1861
1862 for (i = 0; i < num_words; ++i)
1863 hmac->ipad[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
1864 return atmel_sha_cpu_hash(dd, hmac->opad, bs, false,
1865 atmel_sha_hmac_setup_done);
1866}
1867
1868static int atmel_sha_hmac_setup_done(struct atmel_sha_dev *dd)
1869{
1870 struct ahash_request *req = dd->req;
1871 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1872 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1873 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1874 size_t hs = ctx->hash_size;
1875 size_t i, num_words = hs / sizeof(u32);
1876
1877 for (i = 0; i < num_words; ++i)
1878 hmac->opad[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
1879 atmel_sha_hmac_key_release(&hmac->hkey);
1880 return hmac->resume(dd);
1881}
1882
1883static int atmel_sha_hmac_start(struct atmel_sha_dev *dd)
1884{
1885 struct ahash_request *req = dd->req;
1886 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1887 int err;
1888
1889 err = atmel_sha_hw_init(dd);
1890 if (err)
1891 return atmel_sha_complete(dd, err);
1892
1893 switch (ctx->op) {
1894 case SHA_OP_INIT:
1895 err = atmel_sha_hmac_setup(dd, atmel_sha_hmac_init_done);
1896 break;
1897
1898 case SHA_OP_UPDATE:
1899 dd->resume = atmel_sha_done;
1900 err = atmel_sha_update_req(dd);
1901 break;
1902
1903 case SHA_OP_FINAL:
1904 dd->resume = atmel_sha_hmac_final;
1905 err = atmel_sha_final_req(dd);
1906 break;
1907
1908 case SHA_OP_DIGEST:
1909 err = atmel_sha_hmac_setup(dd, atmel_sha_hmac_digest2);
1910 break;
1911
1912 default:
1913 return atmel_sha_complete(dd, -EINVAL);
1914 }
1915
1916 return err;
1917}
1918
1919static int atmel_sha_hmac_setkey(struct crypto_ahash *tfm, const u8 *key,
1920 unsigned int keylen)
1921{
1922 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1923
1924 if (atmel_sha_hmac_key_set(&hmac->hkey, key, keylen)) {
1925 crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
1926 return -EINVAL;
1927 }
1928
1929 return 0;
1930}
1931
1932static int atmel_sha_hmac_init(struct ahash_request *req)
1933{
1934 int err;
1935
1936 err = atmel_sha_init(req);
1937 if (err)
1938 return err;
1939
1940 return atmel_sha_enqueue(req, SHA_OP_INIT);
1941}
1942
1943static int atmel_sha_hmac_init_done(struct atmel_sha_dev *dd)
1944{
1945 struct ahash_request *req = dd->req;
1946 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1947 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1948 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1949 size_t bs = ctx->block_size;
1950 size_t hs = ctx->hash_size;
1951
1952 ctx->bufcnt = 0;
1953 ctx->digcnt[0] = bs;
1954 ctx->digcnt[1] = 0;
1955 ctx->flags |= SHA_FLAGS_RESTORE;
1956 memcpy(ctx->digest, hmac->ipad, hs);
1957 return atmel_sha_complete(dd, 0);
1958}
1959
1960static int atmel_sha_hmac_final(struct atmel_sha_dev *dd)
1961{
1962 struct ahash_request *req = dd->req;
1963 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
1964 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1965 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
1966 u32 *digest = (u32 *)ctx->digest;
1967 size_t ds = crypto_ahash_digestsize(tfm);
1968 size_t bs = ctx->block_size;
1969 size_t hs = ctx->hash_size;
1970 size_t i, num_words;
1971 u32 mr;
1972
1973 /* Save d = SHA((K' + ipad) | msg). */
1974 num_words = ds / sizeof(u32);
1975 for (i = 0; i < num_words; ++i)
1976 digest[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
1977
1978 /* Restore context to finish computing SHA((K' + opad) | d). */
1979 atmel_sha_write(dd, SHA_CR, SHA_CR_WUIHV);
1980 num_words = hs / sizeof(u32);
1981 for (i = 0; i < num_words; ++i)
1982 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->opad[i]);
1983
1984 mr = SHA_MR_MODE_AUTO | SHA_MR_UIHV;
1985 mr |= (ctx->flags & SHA_FLAGS_ALGO_MASK);
1986 atmel_sha_write(dd, SHA_MR, mr);
1987 atmel_sha_write(dd, SHA_MSR, bs + ds);
1988 atmel_sha_write(dd, SHA_BCR, ds);
1989 atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
1990
1991 sg_init_one(&dd->tmp, digest, ds);
1992 return atmel_sha_cpu_start(dd, &dd->tmp, ds, false, true,
1993 atmel_sha_hmac_final_done);
1994}
1995
1996static int atmel_sha_hmac_final_done(struct atmel_sha_dev *dd)
1997{
1998 /*
1999 * req->result might not be sizeof(u32) aligned, so copy the
2000 * digest into ctx->digest[] before memcpy() the data into
2001 * req->result.
2002 */
2003 atmel_sha_copy_hash(dd->req);
2004 atmel_sha_copy_ready_hash(dd->req);
2005 return atmel_sha_complete(dd, 0);
2006}
2007
2008static int atmel_sha_hmac_digest(struct ahash_request *req)
2009{
2010 int err;
2011
2012 err = atmel_sha_init(req);
2013 if (err)
2014 return err;
2015
2016 return atmel_sha_enqueue(req, SHA_OP_DIGEST);
2017}
2018
2019static int atmel_sha_hmac_digest2(struct atmel_sha_dev *dd)
2020{
2021 struct ahash_request *req = dd->req;
2022 struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
2023 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
2024 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
2025 size_t hs = ctx->hash_size;
2026 size_t i, num_words = hs / sizeof(u32);
2027 bool use_dma = false;
2028 u32 mr;
2029
2030 /* Special case for empty message. */
2031 if (!req->nbytes)
2032 return atmel_sha_complete(dd, -EINVAL); // TODO:
2033
2034 /* Check DMA threshold and alignment. */
2035 if (req->nbytes > ATMEL_SHA_DMA_THRESHOLD &&
2036 atmel_sha_dma_check_aligned(dd, req->src, req->nbytes))
2037 use_dma = true;
2038
2039 /* Write both initial hash values to compute a HMAC. */
2040 atmel_sha_write(dd, SHA_CR, SHA_CR_WUIHV);
2041 for (i = 0; i < num_words; ++i)
2042 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->ipad[i]);
2043
2044 atmel_sha_write(dd, SHA_CR, SHA_CR_WUIEHV);
2045 for (i = 0; i < num_words; ++i)
2046 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->opad[i]);
2047
2048 /* Write the Mode, Message Size, Bytes Count then Control Registers. */
2049 mr = (SHA_MR_HMAC | SHA_MR_DUALBUFF);
2050 mr |= ctx->flags & SHA_FLAGS_ALGO_MASK;
2051 if (use_dma)
2052 mr |= SHA_MR_MODE_IDATAR0;
2053 else
2054 mr |= SHA_MR_MODE_AUTO;
2055 atmel_sha_write(dd, SHA_MR, mr);
2056
2057 atmel_sha_write(dd, SHA_MSR, req->nbytes);
2058 atmel_sha_write(dd, SHA_BCR, req->nbytes);
2059
2060 atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
2061
2062 /* Process data. */
2063 if (use_dma)
2064 return atmel_sha_dma_start(dd, req->src, req->nbytes,
2065 atmel_sha_hmac_final_done);
2066
2067 return atmel_sha_cpu_start(dd, req->src, req->nbytes, false, true,
2068 atmel_sha_hmac_final_done);
2069}
2070
2071static int atmel_sha_hmac_cra_init(struct crypto_tfm *tfm)
2072{
2073 struct atmel_sha_hmac_ctx *hmac = crypto_tfm_ctx(tfm);
2074
2075 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
2076 sizeof(struct atmel_sha_reqctx));
2077 hmac->base.start = atmel_sha_hmac_start;
2078 atmel_sha_hmac_key_init(&hmac->hkey);
2079
2080 return 0;
2081}
2082
2083static void atmel_sha_hmac_cra_exit(struct crypto_tfm *tfm)
2084{
2085 struct atmel_sha_hmac_ctx *hmac = crypto_tfm_ctx(tfm);
2086
2087 atmel_sha_hmac_key_release(&hmac->hkey);
2088}
2089
2090static struct ahash_alg sha_hmac_algs[] = {
2091{
2092 .init = atmel_sha_hmac_init,
2093 .update = atmel_sha_update,
2094 .final = atmel_sha_final,
2095 .digest = atmel_sha_hmac_digest,
2096 .setkey = atmel_sha_hmac_setkey,
2097 .export = atmel_sha_export,
2098 .import = atmel_sha_import,
2099 .halg = {
2100 .digestsize = SHA1_DIGEST_SIZE,
2101 .statesize = sizeof(struct atmel_sha_reqctx),
2102 .base = {
2103 .cra_name = "hmac(sha1)",
2104 .cra_driver_name = "atmel-hmac-sha1",
2105 .cra_priority = 100,
2106 .cra_flags = CRYPTO_ALG_ASYNC,
2107 .cra_blocksize = SHA1_BLOCK_SIZE,
2108 .cra_ctxsize = sizeof(struct atmel_sha_hmac_ctx),
2109 .cra_alignmask = 0,
2110 .cra_module = THIS_MODULE,
2111 .cra_init = atmel_sha_hmac_cra_init,
2112 .cra_exit = atmel_sha_hmac_cra_exit,
2113 }
2114 }
2115},
2116{
2117 .init = atmel_sha_hmac_init,
2118 .update = atmel_sha_update,
2119 .final = atmel_sha_final,
2120 .digest = atmel_sha_hmac_digest,
2121 .setkey = atmel_sha_hmac_setkey,
2122 .export = atmel_sha_export,
2123 .import = atmel_sha_import,
2124 .halg = {
2125 .digestsize = SHA224_DIGEST_SIZE,
2126 .statesize = sizeof(struct atmel_sha_reqctx),
2127 .base = {
2128 .cra_name = "hmac(sha224)",
2129 .cra_driver_name = "atmel-hmac-sha224",
2130 .cra_priority = 100,
2131 .cra_flags = CRYPTO_ALG_ASYNC,
2132 .cra_blocksize = SHA224_BLOCK_SIZE,
2133 .cra_ctxsize = sizeof(struct atmel_sha_hmac_ctx),
2134 .cra_alignmask = 0,
2135 .cra_module = THIS_MODULE,
2136 .cra_init = atmel_sha_hmac_cra_init,
2137 .cra_exit = atmel_sha_hmac_cra_exit,
2138 }
2139 }
2140},
2141{
2142 .init = atmel_sha_hmac_init,
2143 .update = atmel_sha_update,
2144 .final = atmel_sha_final,
2145 .digest = atmel_sha_hmac_digest,
2146 .setkey = atmel_sha_hmac_setkey,
2147 .export = atmel_sha_export,
2148 .import = atmel_sha_import,
2149 .halg = {
2150 .digestsize = SHA256_DIGEST_SIZE,
2151 .statesize = sizeof(struct atmel_sha_reqctx),
2152 .base = {
2153 .cra_name = "hmac(sha256)",
2154 .cra_driver_name = "atmel-hmac-sha256",
2155 .cra_priority = 100,
2156 .cra_flags = CRYPTO_ALG_ASYNC,
2157 .cra_blocksize = SHA256_BLOCK_SIZE,
2158 .cra_ctxsize = sizeof(struct atmel_sha_hmac_ctx),
2159 .cra_alignmask = 0,
2160 .cra_module = THIS_MODULE,
2161 .cra_init = atmel_sha_hmac_cra_init,
2162 .cra_exit = atmel_sha_hmac_cra_exit,
2163 }
2164 }
2165},
2166{
2167 .init = atmel_sha_hmac_init,
2168 .update = atmel_sha_update,
2169 .final = atmel_sha_final,
2170 .digest = atmel_sha_hmac_digest,
2171 .setkey = atmel_sha_hmac_setkey,
2172 .export = atmel_sha_export,
2173 .import = atmel_sha_import,
2174 .halg = {
2175 .digestsize = SHA384_DIGEST_SIZE,
2176 .statesize = sizeof(struct atmel_sha_reqctx),
2177 .base = {
2178 .cra_name = "hmac(sha384)",
2179 .cra_driver_name = "atmel-hmac-sha384",
2180 .cra_priority = 100,
2181 .cra_flags = CRYPTO_ALG_ASYNC,
2182 .cra_blocksize = SHA384_BLOCK_SIZE,
2183 .cra_ctxsize = sizeof(struct atmel_sha_hmac_ctx),
2184 .cra_alignmask = 0,
2185 .cra_module = THIS_MODULE,
2186 .cra_init = atmel_sha_hmac_cra_init,
2187 .cra_exit = atmel_sha_hmac_cra_exit,
2188 }
2189 }
2190},
2191{
2192 .init = atmel_sha_hmac_init,
2193 .update = atmel_sha_update,
2194 .final = atmel_sha_final,
2195 .digest = atmel_sha_hmac_digest,
2196 .setkey = atmel_sha_hmac_setkey,
2197 .export = atmel_sha_export,
2198 .import = atmel_sha_import,
2199 .halg = {
2200 .digestsize = SHA512_DIGEST_SIZE,
2201 .statesize = sizeof(struct atmel_sha_reqctx),
2202 .base = {
2203 .cra_name = "hmac(sha512)",
2204 .cra_driver_name = "atmel-hmac-sha512",
2205 .cra_priority = 100,
2206 .cra_flags = CRYPTO_ALG_ASYNC,
2207 .cra_blocksize = SHA512_BLOCK_SIZE,
2208 .cra_ctxsize = sizeof(struct atmel_sha_hmac_ctx),
2209 .cra_alignmask = 0,
2210 .cra_module = THIS_MODULE,
2211 .cra_init = atmel_sha_hmac_cra_init,
2212 .cra_exit = atmel_sha_hmac_cra_exit,
2213 }
2214 }
2215},
2216};
2217
2218#ifdef CONFIG_CRYPTO_DEV_ATMEL_AUTHENC
2219/* authenc functions */
2220
2221static int atmel_sha_authenc_init2(struct atmel_sha_dev *dd);
2222static int atmel_sha_authenc_init_done(struct atmel_sha_dev *dd);
2223static int atmel_sha_authenc_final_done(struct atmel_sha_dev *dd);
2224
2225
2226struct atmel_sha_authenc_ctx {
2227 struct crypto_ahash *tfm;
2228};
2229
2230struct atmel_sha_authenc_reqctx {
2231 struct atmel_sha_reqctx base;
2232
2233 atmel_aes_authenc_fn_t cb;
2234 struct atmel_aes_dev *aes_dev;
2235
2236 /* _init() parameters. */
2237 struct scatterlist *assoc;
2238 u32 assoclen;
2239 u32 textlen;
2240
2241 /* _final() parameters. */
2242 u32 *digest;
2243 unsigned int digestlen;
2244};
2245
2246static void atmel_sha_authenc_complete(struct crypto_async_request *areq,
2247 int err)
2248{
2249 struct ahash_request *req = areq->data;
2250 struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2251
2252 authctx->cb(authctx->aes_dev, err, authctx->base.dd->is_async);
2253}
2254
2255static int atmel_sha_authenc_start(struct atmel_sha_dev *dd)
2256{
2257 struct ahash_request *req = dd->req;
2258 struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2259 int err;
2260
2261 /*
2262 * Force atmel_sha_complete() to call req->base.complete(), ie
2263 * atmel_sha_authenc_complete(), which in turn calls authctx->cb().
2264 */
2265 dd->force_complete = true;
2266
2267 err = atmel_sha_hw_init(dd);
2268 return authctx->cb(authctx->aes_dev, err, dd->is_async);
2269}
2270
2271bool atmel_sha_authenc_is_ready(void)
2272{
2273 struct atmel_sha_ctx dummy;
2274
2275 dummy.dd = NULL;
2276 return (atmel_sha_find_dev(&dummy) != NULL);
2277}
2278EXPORT_SYMBOL_GPL(atmel_sha_authenc_is_ready);
2279
2280unsigned int atmel_sha_authenc_get_reqsize(void)
2281{
2282 return sizeof(struct atmel_sha_authenc_reqctx);
2283}
2284EXPORT_SYMBOL_GPL(atmel_sha_authenc_get_reqsize);
2285
2286struct atmel_sha_authenc_ctx *atmel_sha_authenc_spawn(unsigned long mode)
2287{
2288 struct atmel_sha_authenc_ctx *auth;
2289 struct crypto_ahash *tfm;
2290 struct atmel_sha_ctx *tctx;
2291 const char *name;
2292 int err = -EINVAL;
2293
2294 switch (mode & SHA_FLAGS_MODE_MASK) {
2295 case SHA_FLAGS_HMAC_SHA1:
2296 name = "atmel-hmac-sha1";
2297 break;
2298
2299 case SHA_FLAGS_HMAC_SHA224:
2300 name = "atmel-hmac-sha224";
2301 break;
2302
2303 case SHA_FLAGS_HMAC_SHA256:
2304 name = "atmel-hmac-sha256";
2305 break;
2306
2307 case SHA_FLAGS_HMAC_SHA384:
2308 name = "atmel-hmac-sha384";
2309 break;
2310
2311 case SHA_FLAGS_HMAC_SHA512:
2312 name = "atmel-hmac-sha512";
2313 break;
2314
2315 default:
2316 goto error;
2317 }
2318
2319 tfm = crypto_alloc_ahash(name,
2320 CRYPTO_ALG_TYPE_AHASH,
2321 CRYPTO_ALG_TYPE_AHASH_MASK);
2322 if (IS_ERR(tfm)) {
2323 err = PTR_ERR(tfm);
2324 goto error;
2325 }
2326 tctx = crypto_ahash_ctx(tfm);
2327 tctx->start = atmel_sha_authenc_start;
2328 tctx->flags = mode;
2329
2330 auth = kzalloc(sizeof(*auth), GFP_KERNEL);
2331 if (!auth) {
2332 err = -ENOMEM;
2333 goto err_free_ahash;
2334 }
2335 auth->tfm = tfm;
2336
2337 return auth;
2338
2339err_free_ahash:
2340 crypto_free_ahash(tfm);
2341error:
2342 return ERR_PTR(err);
2343}
2344EXPORT_SYMBOL_GPL(atmel_sha_authenc_spawn);
2345
2346void atmel_sha_authenc_free(struct atmel_sha_authenc_ctx *auth)
2347{
2348 if (auth)
2349 crypto_free_ahash(auth->tfm);
2350 kfree(auth);
2351}
2352EXPORT_SYMBOL_GPL(atmel_sha_authenc_free);
2353
2354int atmel_sha_authenc_setkey(struct atmel_sha_authenc_ctx *auth,
2355 const u8 *key, unsigned int keylen,
2356 u32 *flags)
2357{
2358 struct crypto_ahash *tfm = auth->tfm;
2359 int err;
2360
2361 crypto_ahash_clear_flags(tfm, CRYPTO_TFM_REQ_MASK);
2362 crypto_ahash_set_flags(tfm, *flags & CRYPTO_TFM_REQ_MASK);
2363 err = crypto_ahash_setkey(tfm, key, keylen);
2364 *flags = crypto_ahash_get_flags(tfm);
2365
2366 return err;
2367}
2368EXPORT_SYMBOL_GPL(atmel_sha_authenc_setkey);
2369
2370int atmel_sha_authenc_schedule(struct ahash_request *req,
2371 struct atmel_sha_authenc_ctx *auth,
2372 atmel_aes_authenc_fn_t cb,
2373 struct atmel_aes_dev *aes_dev)
2374{
2375 struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2376 struct atmel_sha_reqctx *ctx = &authctx->base;
2377 struct crypto_ahash *tfm = auth->tfm;
2378 struct atmel_sha_ctx *tctx = crypto_ahash_ctx(tfm);
2379 struct atmel_sha_dev *dd;
2380
2381 /* Reset request context (MUST be done first). */
2382 memset(authctx, 0, sizeof(*authctx));
2383
2384 /* Get SHA device. */
2385 dd = atmel_sha_find_dev(tctx);
2386 if (!dd)
2387 return cb(aes_dev, -ENODEV, false);
2388
2389 /* Init request context. */
2390 ctx->dd = dd;
2391 ctx->buflen = SHA_BUFFER_LEN;
2392 authctx->cb = cb;
2393 authctx->aes_dev = aes_dev;
2394 ahash_request_set_tfm(req, tfm);
2395 ahash_request_set_callback(req, 0, atmel_sha_authenc_complete, req);
2396
2397 return atmel_sha_handle_queue(dd, req);
2398}
2399EXPORT_SYMBOL_GPL(atmel_sha_authenc_schedule);
2400
2401int atmel_sha_authenc_init(struct ahash_request *req,
2402 struct scatterlist *assoc, unsigned int assoclen,
2403 unsigned int textlen,
2404 atmel_aes_authenc_fn_t cb,
2405 struct atmel_aes_dev *aes_dev)
2406{
2407 struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2408 struct atmel_sha_reqctx *ctx = &authctx->base;
2409 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
2410 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
2411 struct atmel_sha_dev *dd = ctx->dd;
2412
2413 if (unlikely(!IS_ALIGNED(assoclen, sizeof(u32))))
2414 return atmel_sha_complete(dd, -EINVAL);
2415
2416 authctx->cb = cb;
2417 authctx->aes_dev = aes_dev;
2418 authctx->assoc = assoc;
2419 authctx->assoclen = assoclen;
2420 authctx->textlen = textlen;
2421
2422 ctx->flags = hmac->base.flags;
2423 return atmel_sha_hmac_setup(dd, atmel_sha_authenc_init2);
2424}
2425EXPORT_SYMBOL_GPL(atmel_sha_authenc_init);
2426
2427static int atmel_sha_authenc_init2(struct atmel_sha_dev *dd)
2428{
2429 struct ahash_request *req = dd->req;
2430 struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2431 struct atmel_sha_reqctx *ctx = &authctx->base;
2432 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
2433 struct atmel_sha_hmac_ctx *hmac = crypto_ahash_ctx(tfm);
2434 size_t hs = ctx->hash_size;
2435 size_t i, num_words = hs / sizeof(u32);
2436 u32 mr, msg_size;
2437
2438 atmel_sha_write(dd, SHA_CR, SHA_CR_WUIHV);
2439 for (i = 0; i < num_words; ++i)
2440 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->ipad[i]);
2441
2442 atmel_sha_write(dd, SHA_CR, SHA_CR_WUIEHV);
2443 for (i = 0; i < num_words; ++i)
2444 atmel_sha_write(dd, SHA_REG_DIN(i), hmac->opad[i]);
2445
2446 mr = (SHA_MR_MODE_IDATAR0 |
2447 SHA_MR_HMAC |
2448 SHA_MR_DUALBUFF);
2449 mr |= ctx->flags & SHA_FLAGS_ALGO_MASK;
2450 atmel_sha_write(dd, SHA_MR, mr);
2451
2452 msg_size = authctx->assoclen + authctx->textlen;
2453 atmel_sha_write(dd, SHA_MSR, msg_size);
2454 atmel_sha_write(dd, SHA_BCR, msg_size);
2455
2456 atmel_sha_write(dd, SHA_CR, SHA_CR_FIRST);
2457
2458 /* Process assoc data. */
2459 return atmel_sha_cpu_start(dd, authctx->assoc, authctx->assoclen,
2460 true, false,
2461 atmel_sha_authenc_init_done);
2462}
2463
2464static int atmel_sha_authenc_init_done(struct atmel_sha_dev *dd)
2465{
2466 struct ahash_request *req = dd->req;
2467 struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2468
2469 return authctx->cb(authctx->aes_dev, 0, dd->is_async);
2470}
2471
2472int atmel_sha_authenc_final(struct ahash_request *req,
2473 u32 *digest, unsigned int digestlen,
2474 atmel_aes_authenc_fn_t cb,
2475 struct atmel_aes_dev *aes_dev)
2476{
2477 struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2478 struct atmel_sha_reqctx *ctx = &authctx->base;
2479 struct atmel_sha_dev *dd = ctx->dd;
2480
2481 switch (ctx->flags & SHA_FLAGS_ALGO_MASK) {
2482 case SHA_FLAGS_SHA1:
2483 authctx->digestlen = SHA1_DIGEST_SIZE;
2484 break;
2485
2486 case SHA_FLAGS_SHA224:
2487 authctx->digestlen = SHA224_DIGEST_SIZE;
2488 break;
2489
2490 case SHA_FLAGS_SHA256:
2491 authctx->digestlen = SHA256_DIGEST_SIZE;
2492 break;
2493
2494 case SHA_FLAGS_SHA384:
2495 authctx->digestlen = SHA384_DIGEST_SIZE;
2496 break;
2497
2498 case SHA_FLAGS_SHA512:
2499 authctx->digestlen = SHA512_DIGEST_SIZE;
2500 break;
2501
2502 default:
2503 return atmel_sha_complete(dd, -EINVAL);
2504 }
2505 if (authctx->digestlen > digestlen)
2506 authctx->digestlen = digestlen;
2507
2508 authctx->cb = cb;
2509 authctx->aes_dev = aes_dev;
2510 authctx->digest = digest;
2511 return atmel_sha_wait_for_data_ready(dd,
2512 atmel_sha_authenc_final_done);
2513}
2514EXPORT_SYMBOL_GPL(atmel_sha_authenc_final);
2515
2516static int atmel_sha_authenc_final_done(struct atmel_sha_dev *dd)
2517{
2518 struct ahash_request *req = dd->req;
2519 struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2520 size_t i, num_words = authctx->digestlen / sizeof(u32);
2521
2522 for (i = 0; i < num_words; ++i)
2523 authctx->digest[i] = atmel_sha_read(dd, SHA_REG_DIGEST(i));
2524
2525 return atmel_sha_complete(dd, 0);
2526}
2527
2528void atmel_sha_authenc_abort(struct ahash_request *req)
2529{
2530 struct atmel_sha_authenc_reqctx *authctx = ahash_request_ctx(req);
2531 struct atmel_sha_reqctx *ctx = &authctx->base;
2532 struct atmel_sha_dev *dd = ctx->dd;
2533
2534 /* Prevent atmel_sha_complete() from calling req->base.complete(). */
2535 dd->is_async = false;
2536 dd->force_complete = false;
2537 (void)atmel_sha_complete(dd, 0);
2538}
2539EXPORT_SYMBOL_GPL(atmel_sha_authenc_abort);
2540
2541#endif /* CONFIG_CRYPTO_DEV_ATMEL_AUTHENC */
2542
2543
2544static void atmel_sha_unregister_algs(struct atmel_sha_dev *dd)
2545{
2546 int i;
2547
2548 if (dd->caps.has_hmac)
2549 for (i = 0; i < ARRAY_SIZE(sha_hmac_algs); i++)
2550 crypto_unregister_ahash(&sha_hmac_algs[i]);
2551
2552 for (i = 0; i < ARRAY_SIZE(sha_1_256_algs); i++)
2553 crypto_unregister_ahash(&sha_1_256_algs[i]);
2554
2555 if (dd->caps.has_sha224)
2556 crypto_unregister_ahash(&sha_224_alg);
2557
2558 if (dd->caps.has_sha_384_512) {
2559 for (i = 0; i < ARRAY_SIZE(sha_384_512_algs); i++)
2560 crypto_unregister_ahash(&sha_384_512_algs[i]);
2561 }
2562}
2563
2564static int atmel_sha_register_algs(struct atmel_sha_dev *dd)
2565{
2566 int err, i, j;
2567
2568 for (i = 0; i < ARRAY_SIZE(sha_1_256_algs); i++) {
2569 err = crypto_register_ahash(&sha_1_256_algs[i]);
2570 if (err)
2571 goto err_sha_1_256_algs;
2572 }
2573
2574 if (dd->caps.has_sha224) {
2575 err = crypto_register_ahash(&sha_224_alg);
2576 if (err)
2577 goto err_sha_224_algs;
2578 }
2579
2580 if (dd->caps.has_sha_384_512) {
2581 for (i = 0; i < ARRAY_SIZE(sha_384_512_algs); i++) {
2582 err = crypto_register_ahash(&sha_384_512_algs[i]);
2583 if (err)
2584 goto err_sha_384_512_algs;
2585 }
2586 }
2587
2588 if (dd->caps.has_hmac) {
2589 for (i = 0; i < ARRAY_SIZE(sha_hmac_algs); i++) {
2590 err = crypto_register_ahash(&sha_hmac_algs[i]);
2591 if (err)
2592 goto err_sha_hmac_algs;
2593 }
2594 }
2595
2596 return 0;
2597
2598 /*i = ARRAY_SIZE(sha_hmac_algs);*/
2599err_sha_hmac_algs:
2600 for (j = 0; j < i; j++)
2601 crypto_unregister_ahash(&sha_hmac_algs[j]);
2602 i = ARRAY_SIZE(sha_384_512_algs);
2603err_sha_384_512_algs:
2604 for (j = 0; j < i; j++)
2605 crypto_unregister_ahash(&sha_384_512_algs[j]);
2606 crypto_unregister_ahash(&sha_224_alg);
2607err_sha_224_algs:
2608 i = ARRAY_SIZE(sha_1_256_algs);
2609err_sha_1_256_algs:
2610 for (j = 0; j < i; j++)
2611 crypto_unregister_ahash(&sha_1_256_algs[j]);
2612
2613 return err;
2614}
2615
2616static bool atmel_sha_filter(struct dma_chan *chan, void *slave)
2617{
2618 struct at_dma_slave *sl = slave;
2619
2620 if (sl && sl->dma_dev == chan->device->dev) {
2621 chan->private = sl;
2622 return true;
2623 } else {
2624 return false;
2625 }
2626}
2627
2628static int atmel_sha_dma_init(struct atmel_sha_dev *dd,
2629 struct crypto_platform_data *pdata)
2630{
2631 dma_cap_mask_t mask_in;
2632
2633 /* Try to grab DMA channel */
2634 dma_cap_zero(mask_in);
2635 dma_cap_set(DMA_SLAVE, mask_in);
2636
2637 dd->dma_lch_in.chan = dma_request_slave_channel_compat(mask_in,
2638 atmel_sha_filter, &pdata->dma_slave->rxdata, dd->dev, "tx");
2639 if (!dd->dma_lch_in.chan) {
2640 dev_warn(dd->dev, "no DMA channel available\n");
2641 return -ENODEV;
2642 }
2643
2644 dd->dma_lch_in.dma_conf.direction = DMA_MEM_TO_DEV;
2645 dd->dma_lch_in.dma_conf.dst_addr = dd->phys_base +
2646 SHA_REG_DIN(0);
2647 dd->dma_lch_in.dma_conf.src_maxburst = 1;
2648 dd->dma_lch_in.dma_conf.src_addr_width =
2649 DMA_SLAVE_BUSWIDTH_4_BYTES;
2650 dd->dma_lch_in.dma_conf.dst_maxburst = 1;
2651 dd->dma_lch_in.dma_conf.dst_addr_width =
2652 DMA_SLAVE_BUSWIDTH_4_BYTES;
2653 dd->dma_lch_in.dma_conf.device_fc = false;
2654
2655 return 0;
2656}
2657
2658static void atmel_sha_dma_cleanup(struct atmel_sha_dev *dd)
2659{
2660 dma_release_channel(dd->dma_lch_in.chan);
2661}
2662
2663static void atmel_sha_get_cap(struct atmel_sha_dev *dd)
2664{
2665
2666 dd->caps.has_dma = 0;
2667 dd->caps.has_dualbuff = 0;
2668 dd->caps.has_sha224 = 0;
2669 dd->caps.has_sha_384_512 = 0;
2670 dd->caps.has_uihv = 0;
2671 dd->caps.has_hmac = 0;
2672
2673 /* keep only major version number */
2674 switch (dd->hw_version & 0xff0) {
2675 case 0x510:
2676 dd->caps.has_dma = 1;
2677 dd->caps.has_dualbuff = 1;
2678 dd->caps.has_sha224 = 1;
2679 dd->caps.has_sha_384_512 = 1;
2680 dd->caps.has_uihv = 1;
2681 dd->caps.has_hmac = 1;
2682 break;
2683 case 0x420:
2684 dd->caps.has_dma = 1;
2685 dd->caps.has_dualbuff = 1;
2686 dd->caps.has_sha224 = 1;
2687 dd->caps.has_sha_384_512 = 1;
2688 dd->caps.has_uihv = 1;
2689 break;
2690 case 0x410:
2691 dd->caps.has_dma = 1;
2692 dd->caps.has_dualbuff = 1;
2693 dd->caps.has_sha224 = 1;
2694 dd->caps.has_sha_384_512 = 1;
2695 break;
2696 case 0x400:
2697 dd->caps.has_dma = 1;
2698 dd->caps.has_dualbuff = 1;
2699 dd->caps.has_sha224 = 1;
2700 break;
2701 case 0x320:
2702 break;
2703 default:
2704 dev_warn(dd->dev,
2705 "Unmanaged sha version, set minimum capabilities\n");
2706 break;
2707 }
2708}
2709
2710#if defined(CONFIG_OF)
2711static const struct of_device_id atmel_sha_dt_ids[] = {
2712 { .compatible = "atmel,at91sam9g46-sha" },
2713 { /* sentinel */ }
2714};
2715
2716MODULE_DEVICE_TABLE(of, atmel_sha_dt_ids);
2717
2718static struct crypto_platform_data *atmel_sha_of_init(struct platform_device *pdev)
2719{
2720 struct device_node *np = pdev->dev.of_node;
2721 struct crypto_platform_data *pdata;
2722
2723 if (!np) {
2724 dev_err(&pdev->dev, "device node not found\n");
2725 return ERR_PTR(-EINVAL);
2726 }
2727
2728 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
2729 if (!pdata)
2730 return ERR_PTR(-ENOMEM);
2731
2732 pdata->dma_slave = devm_kzalloc(&pdev->dev,
2733 sizeof(*(pdata->dma_slave)),
2734 GFP_KERNEL);
2735 if (!pdata->dma_slave)
2736 return ERR_PTR(-ENOMEM);
2737
2738 return pdata;
2739}
2740#else /* CONFIG_OF */
2741static inline struct crypto_platform_data *atmel_sha_of_init(struct platform_device *dev)
2742{
2743 return ERR_PTR(-EINVAL);
2744}
2745#endif
2746
2747static int atmel_sha_probe(struct platform_device *pdev)
2748{
2749 struct atmel_sha_dev *sha_dd;
2750 struct crypto_platform_data *pdata;
2751 struct device *dev = &pdev->dev;
2752 struct resource *sha_res;
2753 int err;
2754
2755 sha_dd = devm_kzalloc(&pdev->dev, sizeof(*sha_dd), GFP_KERNEL);
2756 if (sha_dd == NULL) {
2757 err = -ENOMEM;
2758 goto sha_dd_err;
2759 }
2760
2761 sha_dd->dev = dev;
2762
2763 platform_set_drvdata(pdev, sha_dd);
2764
2765 INIT_LIST_HEAD(&sha_dd->list);
2766 spin_lock_init(&sha_dd->lock);
2767
2768 tasklet_init(&sha_dd->done_task, atmel_sha_done_task,
2769 (unsigned long)sha_dd);
2770 tasklet_init(&sha_dd->queue_task, atmel_sha_queue_task,
2771 (unsigned long)sha_dd);
2772
2773 crypto_init_queue(&sha_dd->queue, ATMEL_SHA_QUEUE_LENGTH);
2774
2775 /* Get the base address */
2776 sha_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2777 if (!sha_res) {
2778 dev_err(dev, "no MEM resource info\n");
2779 err = -ENODEV;
2780 goto res_err;
2781 }
2782 sha_dd->phys_base = sha_res->start;
2783
2784 /* Get the IRQ */
2785 sha_dd->irq = platform_get_irq(pdev, 0);
2786 if (sha_dd->irq < 0) {
2787 dev_err(dev, "no IRQ resource info\n");
2788 err = sha_dd->irq;
2789 goto res_err;
2790 }
2791
2792 err = devm_request_irq(&pdev->dev, sha_dd->irq, atmel_sha_irq,
2793 IRQF_SHARED, "atmel-sha", sha_dd);
2794 if (err) {
2795 dev_err(dev, "unable to request sha irq.\n");
2796 goto res_err;
2797 }
2798
2799 /* Initializing the clock */
2800 sha_dd->iclk = devm_clk_get(&pdev->dev, "sha_clk");
2801 if (IS_ERR(sha_dd->iclk)) {
2802 dev_err(dev, "clock initialization failed.\n");
2803 err = PTR_ERR(sha_dd->iclk);
2804 goto res_err;
2805 }
2806
2807 sha_dd->io_base = devm_ioremap_resource(&pdev->dev, sha_res);
2808 if (IS_ERR(sha_dd->io_base)) {
2809 dev_err(dev, "can't ioremap\n");
2810 err = PTR_ERR(sha_dd->io_base);
2811 goto res_err;
2812 }
2813
2814 err = clk_prepare(sha_dd->iclk);
2815 if (err)
2816 goto res_err;
2817
2818 atmel_sha_hw_version_init(sha_dd);
2819
2820 atmel_sha_get_cap(sha_dd);
2821
2822 if (sha_dd->caps.has_dma) {
2823 pdata = pdev->dev.platform_data;
2824 if (!pdata) {
2825 pdata = atmel_sha_of_init(pdev);
2826 if (IS_ERR(pdata)) {
2827 dev_err(&pdev->dev, "platform data not available\n");
2828 err = PTR_ERR(pdata);
2829 goto iclk_unprepare;
2830 }
2831 }
2832 if (!pdata->dma_slave) {
2833 err = -ENXIO;
2834 goto iclk_unprepare;
2835 }
2836 err = atmel_sha_dma_init(sha_dd, pdata);
2837 if (err)
2838 goto err_sha_dma;
2839
2840 dev_info(dev, "using %s for DMA transfers\n",
2841 dma_chan_name(sha_dd->dma_lch_in.chan));
2842 }
2843
2844 spin_lock(&atmel_sha.lock);
2845 list_add_tail(&sha_dd->list, &atmel_sha.dev_list);
2846 spin_unlock(&atmel_sha.lock);
2847
2848 err = atmel_sha_register_algs(sha_dd);
2849 if (err)
2850 goto err_algs;
2851
2852 dev_info(dev, "Atmel SHA1/SHA256%s%s\n",
2853 sha_dd->caps.has_sha224 ? "/SHA224" : "",
2854 sha_dd->caps.has_sha_384_512 ? "/SHA384/SHA512" : "");
2855
2856 return 0;
2857
2858err_algs:
2859 spin_lock(&atmel_sha.lock);
2860 list_del(&sha_dd->list);
2861 spin_unlock(&atmel_sha.lock);
2862 if (sha_dd->caps.has_dma)
2863 atmel_sha_dma_cleanup(sha_dd);
2864err_sha_dma:
2865iclk_unprepare:
2866 clk_unprepare(sha_dd->iclk);
2867res_err:
2868 tasklet_kill(&sha_dd->queue_task);
2869 tasklet_kill(&sha_dd->done_task);
2870sha_dd_err:
2871 dev_err(dev, "initialization failed.\n");
2872
2873 return err;
2874}
2875
2876static int atmel_sha_remove(struct platform_device *pdev)
2877{
2878 struct atmel_sha_dev *sha_dd;
2879
2880 sha_dd = platform_get_drvdata(pdev);
2881 if (!sha_dd)
2882 return -ENODEV;
2883 spin_lock(&atmel_sha.lock);
2884 list_del(&sha_dd->list);
2885 spin_unlock(&atmel_sha.lock);
2886
2887 atmel_sha_unregister_algs(sha_dd);
2888
2889 tasklet_kill(&sha_dd->queue_task);
2890 tasklet_kill(&sha_dd->done_task);
2891
2892 if (sha_dd->caps.has_dma)
2893 atmel_sha_dma_cleanup(sha_dd);
2894
2895 clk_unprepare(sha_dd->iclk);
2896
2897 return 0;
2898}
2899
2900static struct platform_driver atmel_sha_driver = {
2901 .probe = atmel_sha_probe,
2902 .remove = atmel_sha_remove,
2903 .driver = {
2904 .name = "atmel_sha",
2905 .of_match_table = of_match_ptr(atmel_sha_dt_ids),
2906 },
2907};
2908
2909module_platform_driver(atmel_sha_driver);
2910
2911MODULE_DESCRIPTION("Atmel SHA (1/256/224/384/512) hw acceleration support.");
2912MODULE_LICENSE("GPL v2");
2913MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");