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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) STMicroelectronics SA 2017
4 * Author: Fabien Dessenne <fabien.dessenne@st.com>
5 */
6
7#include <linux/clk.h>
8#include <linux/delay.h>
9#include <linux/interrupt.h>
10#include <linux/iopoll.h>
11#include <linux/module.h>
12#include <linux/of_device.h>
13#include <linux/platform_device.h>
14#include <linux/pm_runtime.h>
15#include <linux/reset.h>
16
17#include <crypto/aes.h>
18#include <crypto/internal/des.h>
19#include <crypto/engine.h>
20#include <crypto/scatterwalk.h>
21#include <crypto/internal/aead.h>
22#include <crypto/internal/skcipher.h>
23
24#define DRIVER_NAME "stm32-cryp"
25
26/* Bit [0] encrypt / decrypt */
27#define FLG_ENCRYPT BIT(0)
28/* Bit [8..1] algo & operation mode */
29#define FLG_AES BIT(1)
30#define FLG_DES BIT(2)
31#define FLG_TDES BIT(3)
32#define FLG_ECB BIT(4)
33#define FLG_CBC BIT(5)
34#define FLG_CTR BIT(6)
35#define FLG_GCM BIT(7)
36#define FLG_CCM BIT(8)
37/* Mode mask = bits [15..0] */
38#define FLG_MODE_MASK GENMASK(15, 0)
39/* Bit [31..16] status */
40#define FLG_CCM_PADDED_WA BIT(16)
41
42/* Registers */
43#define CRYP_CR 0x00000000
44#define CRYP_SR 0x00000004
45#define CRYP_DIN 0x00000008
46#define CRYP_DOUT 0x0000000C
47#define CRYP_DMACR 0x00000010
48#define CRYP_IMSCR 0x00000014
49#define CRYP_RISR 0x00000018
50#define CRYP_MISR 0x0000001C
51#define CRYP_K0LR 0x00000020
52#define CRYP_K0RR 0x00000024
53#define CRYP_K1LR 0x00000028
54#define CRYP_K1RR 0x0000002C
55#define CRYP_K2LR 0x00000030
56#define CRYP_K2RR 0x00000034
57#define CRYP_K3LR 0x00000038
58#define CRYP_K3RR 0x0000003C
59#define CRYP_IV0LR 0x00000040
60#define CRYP_IV0RR 0x00000044
61#define CRYP_IV1LR 0x00000048
62#define CRYP_IV1RR 0x0000004C
63#define CRYP_CSGCMCCM0R 0x00000050
64#define CRYP_CSGCM0R 0x00000070
65
66/* Registers values */
67#define CR_DEC_NOT_ENC 0x00000004
68#define CR_TDES_ECB 0x00000000
69#define CR_TDES_CBC 0x00000008
70#define CR_DES_ECB 0x00000010
71#define CR_DES_CBC 0x00000018
72#define CR_AES_ECB 0x00000020
73#define CR_AES_CBC 0x00000028
74#define CR_AES_CTR 0x00000030
75#define CR_AES_KP 0x00000038
76#define CR_AES_GCM 0x00080000
77#define CR_AES_CCM 0x00080008
78#define CR_AES_UNKNOWN 0xFFFFFFFF
79#define CR_ALGO_MASK 0x00080038
80#define CR_DATA32 0x00000000
81#define CR_DATA16 0x00000040
82#define CR_DATA8 0x00000080
83#define CR_DATA1 0x000000C0
84#define CR_KEY128 0x00000000
85#define CR_KEY192 0x00000100
86#define CR_KEY256 0x00000200
87#define CR_FFLUSH 0x00004000
88#define CR_CRYPEN 0x00008000
89#define CR_PH_INIT 0x00000000
90#define CR_PH_HEADER 0x00010000
91#define CR_PH_PAYLOAD 0x00020000
92#define CR_PH_FINAL 0x00030000
93#define CR_PH_MASK 0x00030000
94#define CR_NBPBL_SHIFT 20
95
96#define SR_BUSY 0x00000010
97#define SR_OFNE 0x00000004
98
99#define IMSCR_IN BIT(0)
100#define IMSCR_OUT BIT(1)
101
102#define MISR_IN BIT(0)
103#define MISR_OUT BIT(1)
104
105/* Misc */
106#define AES_BLOCK_32 (AES_BLOCK_SIZE / sizeof(u32))
107#define GCM_CTR_INIT 2
108#define _walked_in (cryp->in_walk.offset - cryp->in_sg->offset)
109#define _walked_out (cryp->out_walk.offset - cryp->out_sg->offset)
110#define CRYP_AUTOSUSPEND_DELAY 50
111
112struct stm32_cryp_caps {
113 bool swap_final;
114 bool padding_wa;
115};
116
117struct stm32_cryp_ctx {
118 struct crypto_engine_ctx enginectx;
119 struct stm32_cryp *cryp;
120 int keylen;
121 u32 key[AES_KEYSIZE_256 / sizeof(u32)];
122 unsigned long flags;
123};
124
125struct stm32_cryp_reqctx {
126 unsigned long mode;
127};
128
129struct stm32_cryp {
130 struct list_head list;
131 struct device *dev;
132 void __iomem *regs;
133 struct clk *clk;
134 unsigned long flags;
135 u32 irq_status;
136 const struct stm32_cryp_caps *caps;
137 struct stm32_cryp_ctx *ctx;
138
139 struct crypto_engine *engine;
140
141 struct skcipher_request *req;
142 struct aead_request *areq;
143
144 size_t authsize;
145 size_t hw_blocksize;
146
147 size_t total_in;
148 size_t total_in_save;
149 size_t total_out;
150 size_t total_out_save;
151
152 struct scatterlist *in_sg;
153 struct scatterlist *out_sg;
154 struct scatterlist *out_sg_save;
155
156 struct scatterlist in_sgl;
157 struct scatterlist out_sgl;
158 bool sgs_copied;
159
160 int in_sg_len;
161 int out_sg_len;
162
163 struct scatter_walk in_walk;
164 struct scatter_walk out_walk;
165
166 u32 last_ctr[4];
167 u32 gcm_ctr;
168};
169
170struct stm32_cryp_list {
171 struct list_head dev_list;
172 spinlock_t lock; /* protect dev_list */
173};
174
175static struct stm32_cryp_list cryp_list = {
176 .dev_list = LIST_HEAD_INIT(cryp_list.dev_list),
177 .lock = __SPIN_LOCK_UNLOCKED(cryp_list.lock),
178};
179
180static inline bool is_aes(struct stm32_cryp *cryp)
181{
182 return cryp->flags & FLG_AES;
183}
184
185static inline bool is_des(struct stm32_cryp *cryp)
186{
187 return cryp->flags & FLG_DES;
188}
189
190static inline bool is_tdes(struct stm32_cryp *cryp)
191{
192 return cryp->flags & FLG_TDES;
193}
194
195static inline bool is_ecb(struct stm32_cryp *cryp)
196{
197 return cryp->flags & FLG_ECB;
198}
199
200static inline bool is_cbc(struct stm32_cryp *cryp)
201{
202 return cryp->flags & FLG_CBC;
203}
204
205static inline bool is_ctr(struct stm32_cryp *cryp)
206{
207 return cryp->flags & FLG_CTR;
208}
209
210static inline bool is_gcm(struct stm32_cryp *cryp)
211{
212 return cryp->flags & FLG_GCM;
213}
214
215static inline bool is_ccm(struct stm32_cryp *cryp)
216{
217 return cryp->flags & FLG_CCM;
218}
219
220static inline bool is_encrypt(struct stm32_cryp *cryp)
221{
222 return cryp->flags & FLG_ENCRYPT;
223}
224
225static inline bool is_decrypt(struct stm32_cryp *cryp)
226{
227 return !is_encrypt(cryp);
228}
229
230static inline u32 stm32_cryp_read(struct stm32_cryp *cryp, u32 ofst)
231{
232 return readl_relaxed(cryp->regs + ofst);
233}
234
235static inline void stm32_cryp_write(struct stm32_cryp *cryp, u32 ofst, u32 val)
236{
237 writel_relaxed(val, cryp->regs + ofst);
238}
239
240static inline int stm32_cryp_wait_busy(struct stm32_cryp *cryp)
241{
242 u32 status;
243
244 return readl_relaxed_poll_timeout(cryp->regs + CRYP_SR, status,
245 !(status & SR_BUSY), 10, 100000);
246}
247
248static inline int stm32_cryp_wait_enable(struct stm32_cryp *cryp)
249{
250 u32 status;
251
252 return readl_relaxed_poll_timeout(cryp->regs + CRYP_CR, status,
253 !(status & CR_CRYPEN), 10, 100000);
254}
255
256static inline int stm32_cryp_wait_output(struct stm32_cryp *cryp)
257{
258 u32 status;
259
260 return readl_relaxed_poll_timeout(cryp->regs + CRYP_SR, status,
261 status & SR_OFNE, 10, 100000);
262}
263
264static int stm32_cryp_read_auth_tag(struct stm32_cryp *cryp);
265
266static struct stm32_cryp *stm32_cryp_find_dev(struct stm32_cryp_ctx *ctx)
267{
268 struct stm32_cryp *tmp, *cryp = NULL;
269
270 spin_lock_bh(&cryp_list.lock);
271 if (!ctx->cryp) {
272 list_for_each_entry(tmp, &cryp_list.dev_list, list) {
273 cryp = tmp;
274 break;
275 }
276 ctx->cryp = cryp;
277 } else {
278 cryp = ctx->cryp;
279 }
280
281 spin_unlock_bh(&cryp_list.lock);
282
283 return cryp;
284}
285
286static int stm32_cryp_check_aligned(struct scatterlist *sg, size_t total,
287 size_t align)
288{
289 int len = 0;
290
291 if (!total)
292 return 0;
293
294 if (!IS_ALIGNED(total, align))
295 return -EINVAL;
296
297 while (sg) {
298 if (!IS_ALIGNED(sg->offset, sizeof(u32)))
299 return -EINVAL;
300
301 if (!IS_ALIGNED(sg->length, align))
302 return -EINVAL;
303
304 len += sg->length;
305 sg = sg_next(sg);
306 }
307
308 if (len != total)
309 return -EINVAL;
310
311 return 0;
312}
313
314static int stm32_cryp_check_io_aligned(struct stm32_cryp *cryp)
315{
316 int ret;
317
318 ret = stm32_cryp_check_aligned(cryp->in_sg, cryp->total_in,
319 cryp->hw_blocksize);
320 if (ret)
321 return ret;
322
323 ret = stm32_cryp_check_aligned(cryp->out_sg, cryp->total_out,
324 cryp->hw_blocksize);
325
326 return ret;
327}
328
329static void sg_copy_buf(void *buf, struct scatterlist *sg,
330 unsigned int start, unsigned int nbytes, int out)
331{
332 struct scatter_walk walk;
333
334 if (!nbytes)
335 return;
336
337 scatterwalk_start(&walk, sg);
338 scatterwalk_advance(&walk, start);
339 scatterwalk_copychunks(buf, &walk, nbytes, out);
340 scatterwalk_done(&walk, out, 0);
341}
342
343static int stm32_cryp_copy_sgs(struct stm32_cryp *cryp)
344{
345 void *buf_in, *buf_out;
346 int pages, total_in, total_out;
347
348 if (!stm32_cryp_check_io_aligned(cryp)) {
349 cryp->sgs_copied = 0;
350 return 0;
351 }
352
353 total_in = ALIGN(cryp->total_in, cryp->hw_blocksize);
354 pages = total_in ? get_order(total_in) : 1;
355 buf_in = (void *)__get_free_pages(GFP_ATOMIC, pages);
356
357 total_out = ALIGN(cryp->total_out, cryp->hw_blocksize);
358 pages = total_out ? get_order(total_out) : 1;
359 buf_out = (void *)__get_free_pages(GFP_ATOMIC, pages);
360
361 if (!buf_in || !buf_out) {
362 dev_err(cryp->dev, "Can't allocate pages when unaligned\n");
363 cryp->sgs_copied = 0;
364 return -EFAULT;
365 }
366
367 sg_copy_buf(buf_in, cryp->in_sg, 0, cryp->total_in, 0);
368
369 sg_init_one(&cryp->in_sgl, buf_in, total_in);
370 cryp->in_sg = &cryp->in_sgl;
371 cryp->in_sg_len = 1;
372
373 sg_init_one(&cryp->out_sgl, buf_out, total_out);
374 cryp->out_sg_save = cryp->out_sg;
375 cryp->out_sg = &cryp->out_sgl;
376 cryp->out_sg_len = 1;
377
378 cryp->sgs_copied = 1;
379
380 return 0;
381}
382
383static void stm32_cryp_hw_write_iv(struct stm32_cryp *cryp, u32 *iv)
384{
385 if (!iv)
386 return;
387
388 stm32_cryp_write(cryp, CRYP_IV0LR, cpu_to_be32(*iv++));
389 stm32_cryp_write(cryp, CRYP_IV0RR, cpu_to_be32(*iv++));
390
391 if (is_aes(cryp)) {
392 stm32_cryp_write(cryp, CRYP_IV1LR, cpu_to_be32(*iv++));
393 stm32_cryp_write(cryp, CRYP_IV1RR, cpu_to_be32(*iv++));
394 }
395}
396
397static void stm32_cryp_get_iv(struct stm32_cryp *cryp)
398{
399 struct skcipher_request *req = cryp->req;
400 u32 *tmp = (void *)req->iv;
401
402 if (!tmp)
403 return;
404
405 *tmp++ = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV0LR));
406 *tmp++ = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV0RR));
407
408 if (is_aes(cryp)) {
409 *tmp++ = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV1LR));
410 *tmp++ = cpu_to_be32(stm32_cryp_read(cryp, CRYP_IV1RR));
411 }
412}
413
414static void stm32_cryp_hw_write_key(struct stm32_cryp *c)
415{
416 unsigned int i;
417 int r_id;
418
419 if (is_des(c)) {
420 stm32_cryp_write(c, CRYP_K1LR, cpu_to_be32(c->ctx->key[0]));
421 stm32_cryp_write(c, CRYP_K1RR, cpu_to_be32(c->ctx->key[1]));
422 } else {
423 r_id = CRYP_K3RR;
424 for (i = c->ctx->keylen / sizeof(u32); i > 0; i--, r_id -= 4)
425 stm32_cryp_write(c, r_id,
426 cpu_to_be32(c->ctx->key[i - 1]));
427 }
428}
429
430static u32 stm32_cryp_get_hw_mode(struct stm32_cryp *cryp)
431{
432 if (is_aes(cryp) && is_ecb(cryp))
433 return CR_AES_ECB;
434
435 if (is_aes(cryp) && is_cbc(cryp))
436 return CR_AES_CBC;
437
438 if (is_aes(cryp) && is_ctr(cryp))
439 return CR_AES_CTR;
440
441 if (is_aes(cryp) && is_gcm(cryp))
442 return CR_AES_GCM;
443
444 if (is_aes(cryp) && is_ccm(cryp))
445 return CR_AES_CCM;
446
447 if (is_des(cryp) && is_ecb(cryp))
448 return CR_DES_ECB;
449
450 if (is_des(cryp) && is_cbc(cryp))
451 return CR_DES_CBC;
452
453 if (is_tdes(cryp) && is_ecb(cryp))
454 return CR_TDES_ECB;
455
456 if (is_tdes(cryp) && is_cbc(cryp))
457 return CR_TDES_CBC;
458
459 dev_err(cryp->dev, "Unknown mode\n");
460 return CR_AES_UNKNOWN;
461}
462
463static unsigned int stm32_cryp_get_input_text_len(struct stm32_cryp *cryp)
464{
465 return is_encrypt(cryp) ? cryp->areq->cryptlen :
466 cryp->areq->cryptlen - cryp->authsize;
467}
468
469static int stm32_cryp_gcm_init(struct stm32_cryp *cryp, u32 cfg)
470{
471 int ret;
472 u32 iv[4];
473
474 /* Phase 1 : init */
475 memcpy(iv, cryp->areq->iv, 12);
476 iv[3] = cpu_to_be32(GCM_CTR_INIT);
477 cryp->gcm_ctr = GCM_CTR_INIT;
478 stm32_cryp_hw_write_iv(cryp, iv);
479
480 stm32_cryp_write(cryp, CRYP_CR, cfg | CR_PH_INIT | CR_CRYPEN);
481
482 /* Wait for end of processing */
483 ret = stm32_cryp_wait_enable(cryp);
484 if (ret)
485 dev_err(cryp->dev, "Timeout (gcm init)\n");
486
487 return ret;
488}
489
490static int stm32_cryp_ccm_init(struct stm32_cryp *cryp, u32 cfg)
491{
492 int ret;
493 u8 iv[AES_BLOCK_SIZE], b0[AES_BLOCK_SIZE];
494 u32 *d;
495 unsigned int i, textlen;
496
497 /* Phase 1 : init. Firstly set the CTR value to 1 (not 0) */
498 memcpy(iv, cryp->areq->iv, AES_BLOCK_SIZE);
499 memset(iv + AES_BLOCK_SIZE - 1 - iv[0], 0, iv[0] + 1);
500 iv[AES_BLOCK_SIZE - 1] = 1;
501 stm32_cryp_hw_write_iv(cryp, (u32 *)iv);
502
503 /* Build B0 */
504 memcpy(b0, iv, AES_BLOCK_SIZE);
505
506 b0[0] |= (8 * ((cryp->authsize - 2) / 2));
507
508 if (cryp->areq->assoclen)
509 b0[0] |= 0x40;
510
511 textlen = stm32_cryp_get_input_text_len(cryp);
512
513 b0[AES_BLOCK_SIZE - 2] = textlen >> 8;
514 b0[AES_BLOCK_SIZE - 1] = textlen & 0xFF;
515
516 /* Enable HW */
517 stm32_cryp_write(cryp, CRYP_CR, cfg | CR_PH_INIT | CR_CRYPEN);
518
519 /* Write B0 */
520 d = (u32 *)b0;
521
522 for (i = 0; i < AES_BLOCK_32; i++) {
523 if (!cryp->caps->padding_wa)
524 *d = cpu_to_be32(*d);
525 stm32_cryp_write(cryp, CRYP_DIN, *d++);
526 }
527
528 /* Wait for end of processing */
529 ret = stm32_cryp_wait_enable(cryp);
530 if (ret)
531 dev_err(cryp->dev, "Timeout (ccm init)\n");
532
533 return ret;
534}
535
536static int stm32_cryp_hw_init(struct stm32_cryp *cryp)
537{
538 int ret;
539 u32 cfg, hw_mode;
540
541 pm_runtime_get_sync(cryp->dev);
542
543 /* Disable interrupt */
544 stm32_cryp_write(cryp, CRYP_IMSCR, 0);
545
546 /* Set key */
547 stm32_cryp_hw_write_key(cryp);
548
549 /* Set configuration */
550 cfg = CR_DATA8 | CR_FFLUSH;
551
552 switch (cryp->ctx->keylen) {
553 case AES_KEYSIZE_128:
554 cfg |= CR_KEY128;
555 break;
556
557 case AES_KEYSIZE_192:
558 cfg |= CR_KEY192;
559 break;
560
561 default:
562 case AES_KEYSIZE_256:
563 cfg |= CR_KEY256;
564 break;
565 }
566
567 hw_mode = stm32_cryp_get_hw_mode(cryp);
568 if (hw_mode == CR_AES_UNKNOWN)
569 return -EINVAL;
570
571 /* AES ECB/CBC decrypt: run key preparation first */
572 if (is_decrypt(cryp) &&
573 ((hw_mode == CR_AES_ECB) || (hw_mode == CR_AES_CBC))) {
574 stm32_cryp_write(cryp, CRYP_CR, cfg | CR_AES_KP | CR_CRYPEN);
575
576 /* Wait for end of processing */
577 ret = stm32_cryp_wait_busy(cryp);
578 if (ret) {
579 dev_err(cryp->dev, "Timeout (key preparation)\n");
580 return ret;
581 }
582 }
583
584 cfg |= hw_mode;
585
586 if (is_decrypt(cryp))
587 cfg |= CR_DEC_NOT_ENC;
588
589 /* Apply config and flush (valid when CRYPEN = 0) */
590 stm32_cryp_write(cryp, CRYP_CR, cfg);
591
592 switch (hw_mode) {
593 case CR_AES_GCM:
594 case CR_AES_CCM:
595 /* Phase 1 : init */
596 if (hw_mode == CR_AES_CCM)
597 ret = stm32_cryp_ccm_init(cryp, cfg);
598 else
599 ret = stm32_cryp_gcm_init(cryp, cfg);
600
601 if (ret)
602 return ret;
603
604 /* Phase 2 : header (authenticated data) */
605 if (cryp->areq->assoclen) {
606 cfg |= CR_PH_HEADER;
607 } else if (stm32_cryp_get_input_text_len(cryp)) {
608 cfg |= CR_PH_PAYLOAD;
609 stm32_cryp_write(cryp, CRYP_CR, cfg);
610 } else {
611 cfg |= CR_PH_INIT;
612 }
613
614 break;
615
616 case CR_DES_CBC:
617 case CR_TDES_CBC:
618 case CR_AES_CBC:
619 case CR_AES_CTR:
620 stm32_cryp_hw_write_iv(cryp, (u32 *)cryp->req->iv);
621 break;
622
623 default:
624 break;
625 }
626
627 /* Enable now */
628 cfg |= CR_CRYPEN;
629
630 stm32_cryp_write(cryp, CRYP_CR, cfg);
631
632 cryp->flags &= ~FLG_CCM_PADDED_WA;
633
634 return 0;
635}
636
637static void stm32_cryp_finish_req(struct stm32_cryp *cryp, int err)
638{
639 if (!err && (is_gcm(cryp) || is_ccm(cryp)))
640 /* Phase 4 : output tag */
641 err = stm32_cryp_read_auth_tag(cryp);
642
643 if (!err && (!(is_gcm(cryp) || is_ccm(cryp))))
644 stm32_cryp_get_iv(cryp);
645
646 if (cryp->sgs_copied) {
647 void *buf_in, *buf_out;
648 int pages, len;
649
650 buf_in = sg_virt(&cryp->in_sgl);
651 buf_out = sg_virt(&cryp->out_sgl);
652
653 sg_copy_buf(buf_out, cryp->out_sg_save, 0,
654 cryp->total_out_save, 1);
655
656 len = ALIGN(cryp->total_in_save, cryp->hw_blocksize);
657 pages = len ? get_order(len) : 1;
658 free_pages((unsigned long)buf_in, pages);
659
660 len = ALIGN(cryp->total_out_save, cryp->hw_blocksize);
661 pages = len ? get_order(len) : 1;
662 free_pages((unsigned long)buf_out, pages);
663 }
664
665 pm_runtime_mark_last_busy(cryp->dev);
666 pm_runtime_put_autosuspend(cryp->dev);
667
668 if (is_gcm(cryp) || is_ccm(cryp))
669 crypto_finalize_aead_request(cryp->engine, cryp->areq, err);
670 else
671 crypto_finalize_skcipher_request(cryp->engine, cryp->req,
672 err);
673
674 memset(cryp->ctx->key, 0, cryp->ctx->keylen);
675}
676
677static int stm32_cryp_cpu_start(struct stm32_cryp *cryp)
678{
679 /* Enable interrupt and let the IRQ handler do everything */
680 stm32_cryp_write(cryp, CRYP_IMSCR, IMSCR_IN | IMSCR_OUT);
681
682 return 0;
683}
684
685static int stm32_cryp_cipher_one_req(struct crypto_engine *engine, void *areq);
686static int stm32_cryp_prepare_cipher_req(struct crypto_engine *engine,
687 void *areq);
688
689static int stm32_cryp_init_tfm(struct crypto_skcipher *tfm)
690{
691 struct stm32_cryp_ctx *ctx = crypto_skcipher_ctx(tfm);
692
693 crypto_skcipher_set_reqsize(tfm, sizeof(struct stm32_cryp_reqctx));
694
695 ctx->enginectx.op.do_one_request = stm32_cryp_cipher_one_req;
696 ctx->enginectx.op.prepare_request = stm32_cryp_prepare_cipher_req;
697 ctx->enginectx.op.unprepare_request = NULL;
698 return 0;
699}
700
701static int stm32_cryp_aead_one_req(struct crypto_engine *engine, void *areq);
702static int stm32_cryp_prepare_aead_req(struct crypto_engine *engine,
703 void *areq);
704
705static int stm32_cryp_aes_aead_init(struct crypto_aead *tfm)
706{
707 struct stm32_cryp_ctx *ctx = crypto_aead_ctx(tfm);
708
709 tfm->reqsize = sizeof(struct stm32_cryp_reqctx);
710
711 ctx->enginectx.op.do_one_request = stm32_cryp_aead_one_req;
712 ctx->enginectx.op.prepare_request = stm32_cryp_prepare_aead_req;
713 ctx->enginectx.op.unprepare_request = NULL;
714
715 return 0;
716}
717
718static int stm32_cryp_crypt(struct skcipher_request *req, unsigned long mode)
719{
720 struct stm32_cryp_ctx *ctx = crypto_skcipher_ctx(
721 crypto_skcipher_reqtfm(req));
722 struct stm32_cryp_reqctx *rctx = skcipher_request_ctx(req);
723 struct stm32_cryp *cryp = stm32_cryp_find_dev(ctx);
724
725 if (!cryp)
726 return -ENODEV;
727
728 rctx->mode = mode;
729
730 return crypto_transfer_skcipher_request_to_engine(cryp->engine, req);
731}
732
733static int stm32_cryp_aead_crypt(struct aead_request *req, unsigned long mode)
734{
735 struct stm32_cryp_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
736 struct stm32_cryp_reqctx *rctx = aead_request_ctx(req);
737 struct stm32_cryp *cryp = stm32_cryp_find_dev(ctx);
738
739 if (!cryp)
740 return -ENODEV;
741
742 rctx->mode = mode;
743
744 return crypto_transfer_aead_request_to_engine(cryp->engine, req);
745}
746
747static int stm32_cryp_setkey(struct crypto_skcipher *tfm, const u8 *key,
748 unsigned int keylen)
749{
750 struct stm32_cryp_ctx *ctx = crypto_skcipher_ctx(tfm);
751
752 memcpy(ctx->key, key, keylen);
753 ctx->keylen = keylen;
754
755 return 0;
756}
757
758static int stm32_cryp_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
759 unsigned int keylen)
760{
761 if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
762 keylen != AES_KEYSIZE_256)
763 return -EINVAL;
764 else
765 return stm32_cryp_setkey(tfm, key, keylen);
766}
767
768static int stm32_cryp_des_setkey(struct crypto_skcipher *tfm, const u8 *key,
769 unsigned int keylen)
770{
771 return verify_skcipher_des_key(tfm, key) ?:
772 stm32_cryp_setkey(tfm, key, keylen);
773}
774
775static int stm32_cryp_tdes_setkey(struct crypto_skcipher *tfm, const u8 *key,
776 unsigned int keylen)
777{
778 return verify_skcipher_des3_key(tfm, key) ?:
779 stm32_cryp_setkey(tfm, key, keylen);
780}
781
782static int stm32_cryp_aes_aead_setkey(struct crypto_aead *tfm, const u8 *key,
783 unsigned int keylen)
784{
785 struct stm32_cryp_ctx *ctx = crypto_aead_ctx(tfm);
786
787 if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
788 keylen != AES_KEYSIZE_256)
789 return -EINVAL;
790
791 memcpy(ctx->key, key, keylen);
792 ctx->keylen = keylen;
793
794 return 0;
795}
796
797static int stm32_cryp_aes_gcm_setauthsize(struct crypto_aead *tfm,
798 unsigned int authsize)
799{
800 return authsize == AES_BLOCK_SIZE ? 0 : -EINVAL;
801}
802
803static int stm32_cryp_aes_ccm_setauthsize(struct crypto_aead *tfm,
804 unsigned int authsize)
805{
806 switch (authsize) {
807 case 4:
808 case 6:
809 case 8:
810 case 10:
811 case 12:
812 case 14:
813 case 16:
814 break;
815 default:
816 return -EINVAL;
817 }
818
819 return 0;
820}
821
822static int stm32_cryp_aes_ecb_encrypt(struct skcipher_request *req)
823{
824 return stm32_cryp_crypt(req, FLG_AES | FLG_ECB | FLG_ENCRYPT);
825}
826
827static int stm32_cryp_aes_ecb_decrypt(struct skcipher_request *req)
828{
829 return stm32_cryp_crypt(req, FLG_AES | FLG_ECB);
830}
831
832static int stm32_cryp_aes_cbc_encrypt(struct skcipher_request *req)
833{
834 return stm32_cryp_crypt(req, FLG_AES | FLG_CBC | FLG_ENCRYPT);
835}
836
837static int stm32_cryp_aes_cbc_decrypt(struct skcipher_request *req)
838{
839 return stm32_cryp_crypt(req, FLG_AES | FLG_CBC);
840}
841
842static int stm32_cryp_aes_ctr_encrypt(struct skcipher_request *req)
843{
844 return stm32_cryp_crypt(req, FLG_AES | FLG_CTR | FLG_ENCRYPT);
845}
846
847static int stm32_cryp_aes_ctr_decrypt(struct skcipher_request *req)
848{
849 return stm32_cryp_crypt(req, FLG_AES | FLG_CTR);
850}
851
852static int stm32_cryp_aes_gcm_encrypt(struct aead_request *req)
853{
854 return stm32_cryp_aead_crypt(req, FLG_AES | FLG_GCM | FLG_ENCRYPT);
855}
856
857static int stm32_cryp_aes_gcm_decrypt(struct aead_request *req)
858{
859 return stm32_cryp_aead_crypt(req, FLG_AES | FLG_GCM);
860}
861
862static int stm32_cryp_aes_ccm_encrypt(struct aead_request *req)
863{
864 return stm32_cryp_aead_crypt(req, FLG_AES | FLG_CCM | FLG_ENCRYPT);
865}
866
867static int stm32_cryp_aes_ccm_decrypt(struct aead_request *req)
868{
869 return stm32_cryp_aead_crypt(req, FLG_AES | FLG_CCM);
870}
871
872static int stm32_cryp_des_ecb_encrypt(struct skcipher_request *req)
873{
874 return stm32_cryp_crypt(req, FLG_DES | FLG_ECB | FLG_ENCRYPT);
875}
876
877static int stm32_cryp_des_ecb_decrypt(struct skcipher_request *req)
878{
879 return stm32_cryp_crypt(req, FLG_DES | FLG_ECB);
880}
881
882static int stm32_cryp_des_cbc_encrypt(struct skcipher_request *req)
883{
884 return stm32_cryp_crypt(req, FLG_DES | FLG_CBC | FLG_ENCRYPT);
885}
886
887static int stm32_cryp_des_cbc_decrypt(struct skcipher_request *req)
888{
889 return stm32_cryp_crypt(req, FLG_DES | FLG_CBC);
890}
891
892static int stm32_cryp_tdes_ecb_encrypt(struct skcipher_request *req)
893{
894 return stm32_cryp_crypt(req, FLG_TDES | FLG_ECB | FLG_ENCRYPT);
895}
896
897static int stm32_cryp_tdes_ecb_decrypt(struct skcipher_request *req)
898{
899 return stm32_cryp_crypt(req, FLG_TDES | FLG_ECB);
900}
901
902static int stm32_cryp_tdes_cbc_encrypt(struct skcipher_request *req)
903{
904 return stm32_cryp_crypt(req, FLG_TDES | FLG_CBC | FLG_ENCRYPT);
905}
906
907static int stm32_cryp_tdes_cbc_decrypt(struct skcipher_request *req)
908{
909 return stm32_cryp_crypt(req, FLG_TDES | FLG_CBC);
910}
911
912static int stm32_cryp_prepare_req(struct skcipher_request *req,
913 struct aead_request *areq)
914{
915 struct stm32_cryp_ctx *ctx;
916 struct stm32_cryp *cryp;
917 struct stm32_cryp_reqctx *rctx;
918 int ret;
919
920 if (!req && !areq)
921 return -EINVAL;
922
923 ctx = req ? crypto_skcipher_ctx(crypto_skcipher_reqtfm(req)) :
924 crypto_aead_ctx(crypto_aead_reqtfm(areq));
925
926 cryp = ctx->cryp;
927
928 if (!cryp)
929 return -ENODEV;
930
931 rctx = req ? skcipher_request_ctx(req) : aead_request_ctx(areq);
932 rctx->mode &= FLG_MODE_MASK;
933
934 ctx->cryp = cryp;
935
936 cryp->flags = (cryp->flags & ~FLG_MODE_MASK) | rctx->mode;
937 cryp->hw_blocksize = is_aes(cryp) ? AES_BLOCK_SIZE : DES_BLOCK_SIZE;
938 cryp->ctx = ctx;
939
940 if (req) {
941 cryp->req = req;
942 cryp->areq = NULL;
943 cryp->total_in = req->cryptlen;
944 cryp->total_out = cryp->total_in;
945 } else {
946 /*
947 * Length of input and output data:
948 * Encryption case:
949 * INPUT = AssocData || PlainText
950 * <- assoclen -> <- cryptlen ->
951 * <------- total_in ----------->
952 *
953 * OUTPUT = AssocData || CipherText || AuthTag
954 * <- assoclen -> <- cryptlen -> <- authsize ->
955 * <---------------- total_out ----------------->
956 *
957 * Decryption case:
958 * INPUT = AssocData || CipherText || AuthTag
959 * <- assoclen -> <--------- cryptlen --------->
960 * <- authsize ->
961 * <---------------- total_in ------------------>
962 *
963 * OUTPUT = AssocData || PlainText
964 * <- assoclen -> <- crypten - authsize ->
965 * <---------- total_out ----------------->
966 */
967 cryp->areq = areq;
968 cryp->req = NULL;
969 cryp->authsize = crypto_aead_authsize(crypto_aead_reqtfm(areq));
970 cryp->total_in = areq->assoclen + areq->cryptlen;
971 if (is_encrypt(cryp))
972 /* Append auth tag to output */
973 cryp->total_out = cryp->total_in + cryp->authsize;
974 else
975 /* No auth tag in output */
976 cryp->total_out = cryp->total_in - cryp->authsize;
977 }
978
979 cryp->total_in_save = cryp->total_in;
980 cryp->total_out_save = cryp->total_out;
981
982 cryp->in_sg = req ? req->src : areq->src;
983 cryp->out_sg = req ? req->dst : areq->dst;
984 cryp->out_sg_save = cryp->out_sg;
985
986 cryp->in_sg_len = sg_nents_for_len(cryp->in_sg, cryp->total_in);
987 if (cryp->in_sg_len < 0) {
988 dev_err(cryp->dev, "Cannot get in_sg_len\n");
989 ret = cryp->in_sg_len;
990 return ret;
991 }
992
993 cryp->out_sg_len = sg_nents_for_len(cryp->out_sg, cryp->total_out);
994 if (cryp->out_sg_len < 0) {
995 dev_err(cryp->dev, "Cannot get out_sg_len\n");
996 ret = cryp->out_sg_len;
997 return ret;
998 }
999
1000 ret = stm32_cryp_copy_sgs(cryp);
1001 if (ret)
1002 return ret;
1003
1004 scatterwalk_start(&cryp->in_walk, cryp->in_sg);
1005 scatterwalk_start(&cryp->out_walk, cryp->out_sg);
1006
1007 if (is_gcm(cryp) || is_ccm(cryp)) {
1008 /* In output, jump after assoc data */
1009 scatterwalk_advance(&cryp->out_walk, cryp->areq->assoclen);
1010 cryp->total_out -= cryp->areq->assoclen;
1011 }
1012
1013 ret = stm32_cryp_hw_init(cryp);
1014 return ret;
1015}
1016
1017static int stm32_cryp_prepare_cipher_req(struct crypto_engine *engine,
1018 void *areq)
1019{
1020 struct skcipher_request *req = container_of(areq,
1021 struct skcipher_request,
1022 base);
1023
1024 return stm32_cryp_prepare_req(req, NULL);
1025}
1026
1027static int stm32_cryp_cipher_one_req(struct crypto_engine *engine, void *areq)
1028{
1029 struct skcipher_request *req = container_of(areq,
1030 struct skcipher_request,
1031 base);
1032 struct stm32_cryp_ctx *ctx = crypto_skcipher_ctx(
1033 crypto_skcipher_reqtfm(req));
1034 struct stm32_cryp *cryp = ctx->cryp;
1035
1036 if (!cryp)
1037 return -ENODEV;
1038
1039 return stm32_cryp_cpu_start(cryp);
1040}
1041
1042static int stm32_cryp_prepare_aead_req(struct crypto_engine *engine, void *areq)
1043{
1044 struct aead_request *req = container_of(areq, struct aead_request,
1045 base);
1046
1047 return stm32_cryp_prepare_req(NULL, req);
1048}
1049
1050static int stm32_cryp_aead_one_req(struct crypto_engine *engine, void *areq)
1051{
1052 struct aead_request *req = container_of(areq, struct aead_request,
1053 base);
1054 struct stm32_cryp_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
1055 struct stm32_cryp *cryp = ctx->cryp;
1056
1057 if (!cryp)
1058 return -ENODEV;
1059
1060 if (unlikely(!cryp->areq->assoclen &&
1061 !stm32_cryp_get_input_text_len(cryp))) {
1062 /* No input data to process: get tag and finish */
1063 stm32_cryp_finish_req(cryp, 0);
1064 return 0;
1065 }
1066
1067 return stm32_cryp_cpu_start(cryp);
1068}
1069
1070static u32 *stm32_cryp_next_out(struct stm32_cryp *cryp, u32 *dst,
1071 unsigned int n)
1072{
1073 scatterwalk_advance(&cryp->out_walk, n);
1074
1075 if (unlikely(cryp->out_sg->length == _walked_out)) {
1076 cryp->out_sg = sg_next(cryp->out_sg);
1077 if (cryp->out_sg) {
1078 scatterwalk_start(&cryp->out_walk, cryp->out_sg);
1079 return (sg_virt(cryp->out_sg) + _walked_out);
1080 }
1081 }
1082
1083 return (u32 *)((u8 *)dst + n);
1084}
1085
1086static u32 *stm32_cryp_next_in(struct stm32_cryp *cryp, u32 *src,
1087 unsigned int n)
1088{
1089 scatterwalk_advance(&cryp->in_walk, n);
1090
1091 if (unlikely(cryp->in_sg->length == _walked_in)) {
1092 cryp->in_sg = sg_next(cryp->in_sg);
1093 if (cryp->in_sg) {
1094 scatterwalk_start(&cryp->in_walk, cryp->in_sg);
1095 return (sg_virt(cryp->in_sg) + _walked_in);
1096 }
1097 }
1098
1099 return (u32 *)((u8 *)src + n);
1100}
1101
1102static int stm32_cryp_read_auth_tag(struct stm32_cryp *cryp)
1103{
1104 u32 cfg, size_bit, *dst, d32;
1105 u8 *d8;
1106 unsigned int i, j;
1107 int ret = 0;
1108
1109 /* Update Config */
1110 cfg = stm32_cryp_read(cryp, CRYP_CR);
1111
1112 cfg &= ~CR_PH_MASK;
1113 cfg |= CR_PH_FINAL;
1114 cfg &= ~CR_DEC_NOT_ENC;
1115 cfg |= CR_CRYPEN;
1116
1117 stm32_cryp_write(cryp, CRYP_CR, cfg);
1118
1119 if (is_gcm(cryp)) {
1120 /* GCM: write aad and payload size (in bits) */
1121 size_bit = cryp->areq->assoclen * 8;
1122 if (cryp->caps->swap_final)
1123 size_bit = cpu_to_be32(size_bit);
1124
1125 stm32_cryp_write(cryp, CRYP_DIN, 0);
1126 stm32_cryp_write(cryp, CRYP_DIN, size_bit);
1127
1128 size_bit = is_encrypt(cryp) ? cryp->areq->cryptlen :
1129 cryp->areq->cryptlen - AES_BLOCK_SIZE;
1130 size_bit *= 8;
1131 if (cryp->caps->swap_final)
1132 size_bit = cpu_to_be32(size_bit);
1133
1134 stm32_cryp_write(cryp, CRYP_DIN, 0);
1135 stm32_cryp_write(cryp, CRYP_DIN, size_bit);
1136 } else {
1137 /* CCM: write CTR0 */
1138 u8 iv[AES_BLOCK_SIZE];
1139 u32 *iv32 = (u32 *)iv;
1140
1141 memcpy(iv, cryp->areq->iv, AES_BLOCK_SIZE);
1142 memset(iv + AES_BLOCK_SIZE - 1 - iv[0], 0, iv[0] + 1);
1143
1144 for (i = 0; i < AES_BLOCK_32; i++) {
1145 if (!cryp->caps->padding_wa)
1146 *iv32 = cpu_to_be32(*iv32);
1147 stm32_cryp_write(cryp, CRYP_DIN, *iv32++);
1148 }
1149 }
1150
1151 /* Wait for output data */
1152 ret = stm32_cryp_wait_output(cryp);
1153 if (ret) {
1154 dev_err(cryp->dev, "Timeout (read tag)\n");
1155 return ret;
1156 }
1157
1158 if (is_encrypt(cryp)) {
1159 /* Get and write tag */
1160 dst = sg_virt(cryp->out_sg) + _walked_out;
1161
1162 for (i = 0; i < AES_BLOCK_32; i++) {
1163 if (cryp->total_out >= sizeof(u32)) {
1164 /* Read a full u32 */
1165 *dst = stm32_cryp_read(cryp, CRYP_DOUT);
1166
1167 dst = stm32_cryp_next_out(cryp, dst,
1168 sizeof(u32));
1169 cryp->total_out -= sizeof(u32);
1170 } else if (!cryp->total_out) {
1171 /* Empty fifo out (data from input padding) */
1172 stm32_cryp_read(cryp, CRYP_DOUT);
1173 } else {
1174 /* Read less than an u32 */
1175 d32 = stm32_cryp_read(cryp, CRYP_DOUT);
1176 d8 = (u8 *)&d32;
1177
1178 for (j = 0; j < cryp->total_out; j++) {
1179 *((u8 *)dst) = *(d8++);
1180 dst = stm32_cryp_next_out(cryp, dst, 1);
1181 }
1182 cryp->total_out = 0;
1183 }
1184 }
1185 } else {
1186 /* Get and check tag */
1187 u32 in_tag[AES_BLOCK_32], out_tag[AES_BLOCK_32];
1188
1189 scatterwalk_map_and_copy(in_tag, cryp->in_sg,
1190 cryp->total_in_save - cryp->authsize,
1191 cryp->authsize, 0);
1192
1193 for (i = 0; i < AES_BLOCK_32; i++)
1194 out_tag[i] = stm32_cryp_read(cryp, CRYP_DOUT);
1195
1196 if (crypto_memneq(in_tag, out_tag, cryp->authsize))
1197 ret = -EBADMSG;
1198 }
1199
1200 /* Disable cryp */
1201 cfg &= ~CR_CRYPEN;
1202 stm32_cryp_write(cryp, CRYP_CR, cfg);
1203
1204 return ret;
1205}
1206
1207static void stm32_cryp_check_ctr_counter(struct stm32_cryp *cryp)
1208{
1209 u32 cr;
1210
1211 if (unlikely(cryp->last_ctr[3] == 0xFFFFFFFF)) {
1212 cryp->last_ctr[3] = 0;
1213 cryp->last_ctr[2]++;
1214 if (!cryp->last_ctr[2]) {
1215 cryp->last_ctr[1]++;
1216 if (!cryp->last_ctr[1])
1217 cryp->last_ctr[0]++;
1218 }
1219
1220 cr = stm32_cryp_read(cryp, CRYP_CR);
1221 stm32_cryp_write(cryp, CRYP_CR, cr & ~CR_CRYPEN);
1222
1223 stm32_cryp_hw_write_iv(cryp, (u32 *)cryp->last_ctr);
1224
1225 stm32_cryp_write(cryp, CRYP_CR, cr);
1226 }
1227
1228 cryp->last_ctr[0] = stm32_cryp_read(cryp, CRYP_IV0LR);
1229 cryp->last_ctr[1] = stm32_cryp_read(cryp, CRYP_IV0RR);
1230 cryp->last_ctr[2] = stm32_cryp_read(cryp, CRYP_IV1LR);
1231 cryp->last_ctr[3] = stm32_cryp_read(cryp, CRYP_IV1RR);
1232}
1233
1234static bool stm32_cryp_irq_read_data(struct stm32_cryp *cryp)
1235{
1236 unsigned int i, j;
1237 u32 d32, *dst;
1238 u8 *d8;
1239 size_t tag_size;
1240
1241 /* Do no read tag now (if any) */
1242 if (is_encrypt(cryp) && (is_gcm(cryp) || is_ccm(cryp)))
1243 tag_size = cryp->authsize;
1244 else
1245 tag_size = 0;
1246
1247 dst = sg_virt(cryp->out_sg) + _walked_out;
1248
1249 for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++) {
1250 if (likely(cryp->total_out - tag_size >= sizeof(u32))) {
1251 /* Read a full u32 */
1252 *dst = stm32_cryp_read(cryp, CRYP_DOUT);
1253
1254 dst = stm32_cryp_next_out(cryp, dst, sizeof(u32));
1255 cryp->total_out -= sizeof(u32);
1256 } else if (cryp->total_out == tag_size) {
1257 /* Empty fifo out (data from input padding) */
1258 d32 = stm32_cryp_read(cryp, CRYP_DOUT);
1259 } else {
1260 /* Read less than an u32 */
1261 d32 = stm32_cryp_read(cryp, CRYP_DOUT);
1262 d8 = (u8 *)&d32;
1263
1264 for (j = 0; j < cryp->total_out - tag_size; j++) {
1265 *((u8 *)dst) = *(d8++);
1266 dst = stm32_cryp_next_out(cryp, dst, 1);
1267 }
1268 cryp->total_out = tag_size;
1269 }
1270 }
1271
1272 return !(cryp->total_out - tag_size) || !cryp->total_in;
1273}
1274
1275static void stm32_cryp_irq_write_block(struct stm32_cryp *cryp)
1276{
1277 unsigned int i, j;
1278 u32 *src;
1279 u8 d8[4];
1280 size_t tag_size;
1281
1282 /* Do no write tag (if any) */
1283 if (is_decrypt(cryp) && (is_gcm(cryp) || is_ccm(cryp)))
1284 tag_size = cryp->authsize;
1285 else
1286 tag_size = 0;
1287
1288 src = sg_virt(cryp->in_sg) + _walked_in;
1289
1290 for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++) {
1291 if (likely(cryp->total_in - tag_size >= sizeof(u32))) {
1292 /* Write a full u32 */
1293 stm32_cryp_write(cryp, CRYP_DIN, *src);
1294
1295 src = stm32_cryp_next_in(cryp, src, sizeof(u32));
1296 cryp->total_in -= sizeof(u32);
1297 } else if (cryp->total_in == tag_size) {
1298 /* Write padding data */
1299 stm32_cryp_write(cryp, CRYP_DIN, 0);
1300 } else {
1301 /* Write less than an u32 */
1302 memset(d8, 0, sizeof(u32));
1303 for (j = 0; j < cryp->total_in - tag_size; j++) {
1304 d8[j] = *((u8 *)src);
1305 src = stm32_cryp_next_in(cryp, src, 1);
1306 }
1307
1308 stm32_cryp_write(cryp, CRYP_DIN, *(u32 *)d8);
1309 cryp->total_in = tag_size;
1310 }
1311 }
1312}
1313
1314static void stm32_cryp_irq_write_gcm_padded_data(struct stm32_cryp *cryp)
1315{
1316 int err;
1317 u32 cfg, tmp[AES_BLOCK_32];
1318 size_t total_in_ori = cryp->total_in;
1319 struct scatterlist *out_sg_ori = cryp->out_sg;
1320 unsigned int i;
1321
1322 /* 'Special workaround' procedure described in the datasheet */
1323
1324 /* a) disable ip */
1325 stm32_cryp_write(cryp, CRYP_IMSCR, 0);
1326 cfg = stm32_cryp_read(cryp, CRYP_CR);
1327 cfg &= ~CR_CRYPEN;
1328 stm32_cryp_write(cryp, CRYP_CR, cfg);
1329
1330 /* b) Update IV1R */
1331 stm32_cryp_write(cryp, CRYP_IV1RR, cryp->gcm_ctr - 2);
1332
1333 /* c) change mode to CTR */
1334 cfg &= ~CR_ALGO_MASK;
1335 cfg |= CR_AES_CTR;
1336 stm32_cryp_write(cryp, CRYP_CR, cfg);
1337
1338 /* a) enable IP */
1339 cfg |= CR_CRYPEN;
1340 stm32_cryp_write(cryp, CRYP_CR, cfg);
1341
1342 /* b) pad and write the last block */
1343 stm32_cryp_irq_write_block(cryp);
1344 cryp->total_in = total_in_ori;
1345 err = stm32_cryp_wait_output(cryp);
1346 if (err) {
1347 dev_err(cryp->dev, "Timeout (write gcm header)\n");
1348 return stm32_cryp_finish_req(cryp, err);
1349 }
1350
1351 /* c) get and store encrypted data */
1352 stm32_cryp_irq_read_data(cryp);
1353 scatterwalk_map_and_copy(tmp, out_sg_ori,
1354 cryp->total_in_save - total_in_ori,
1355 total_in_ori, 0);
1356
1357 /* d) change mode back to AES GCM */
1358 cfg &= ~CR_ALGO_MASK;
1359 cfg |= CR_AES_GCM;
1360 stm32_cryp_write(cryp, CRYP_CR, cfg);
1361
1362 /* e) change phase to Final */
1363 cfg &= ~CR_PH_MASK;
1364 cfg |= CR_PH_FINAL;
1365 stm32_cryp_write(cryp, CRYP_CR, cfg);
1366
1367 /* f) write padded data */
1368 for (i = 0; i < AES_BLOCK_32; i++) {
1369 if (cryp->total_in)
1370 stm32_cryp_write(cryp, CRYP_DIN, tmp[i]);
1371 else
1372 stm32_cryp_write(cryp, CRYP_DIN, 0);
1373
1374 cryp->total_in -= min_t(size_t, sizeof(u32), cryp->total_in);
1375 }
1376
1377 /* g) Empty fifo out */
1378 err = stm32_cryp_wait_output(cryp);
1379 if (err) {
1380 dev_err(cryp->dev, "Timeout (write gcm header)\n");
1381 return stm32_cryp_finish_req(cryp, err);
1382 }
1383
1384 for (i = 0; i < AES_BLOCK_32; i++)
1385 stm32_cryp_read(cryp, CRYP_DOUT);
1386
1387 /* h) run the he normal Final phase */
1388 stm32_cryp_finish_req(cryp, 0);
1389}
1390
1391static void stm32_cryp_irq_set_npblb(struct stm32_cryp *cryp)
1392{
1393 u32 cfg, payload_bytes;
1394
1395 /* disable ip, set NPBLB and reneable ip */
1396 cfg = stm32_cryp_read(cryp, CRYP_CR);
1397 cfg &= ~CR_CRYPEN;
1398 stm32_cryp_write(cryp, CRYP_CR, cfg);
1399
1400 payload_bytes = is_decrypt(cryp) ? cryp->total_in - cryp->authsize :
1401 cryp->total_in;
1402 cfg |= (cryp->hw_blocksize - payload_bytes) << CR_NBPBL_SHIFT;
1403 cfg |= CR_CRYPEN;
1404 stm32_cryp_write(cryp, CRYP_CR, cfg);
1405}
1406
1407static void stm32_cryp_irq_write_ccm_padded_data(struct stm32_cryp *cryp)
1408{
1409 int err = 0;
1410 u32 cfg, iv1tmp;
1411 u32 cstmp1[AES_BLOCK_32], cstmp2[AES_BLOCK_32], tmp[AES_BLOCK_32];
1412 size_t last_total_out, total_in_ori = cryp->total_in;
1413 struct scatterlist *out_sg_ori = cryp->out_sg;
1414 unsigned int i;
1415
1416 /* 'Special workaround' procedure described in the datasheet */
1417 cryp->flags |= FLG_CCM_PADDED_WA;
1418
1419 /* a) disable ip */
1420 stm32_cryp_write(cryp, CRYP_IMSCR, 0);
1421
1422 cfg = stm32_cryp_read(cryp, CRYP_CR);
1423 cfg &= ~CR_CRYPEN;
1424 stm32_cryp_write(cryp, CRYP_CR, cfg);
1425
1426 /* b) get IV1 from CRYP_CSGCMCCM7 */
1427 iv1tmp = stm32_cryp_read(cryp, CRYP_CSGCMCCM0R + 7 * 4);
1428
1429 /* c) Load CRYP_CSGCMCCMxR */
1430 for (i = 0; i < ARRAY_SIZE(cstmp1); i++)
1431 cstmp1[i] = stm32_cryp_read(cryp, CRYP_CSGCMCCM0R + i * 4);
1432
1433 /* d) Write IV1R */
1434 stm32_cryp_write(cryp, CRYP_IV1RR, iv1tmp);
1435
1436 /* e) change mode to CTR */
1437 cfg &= ~CR_ALGO_MASK;
1438 cfg |= CR_AES_CTR;
1439 stm32_cryp_write(cryp, CRYP_CR, cfg);
1440
1441 /* a) enable IP */
1442 cfg |= CR_CRYPEN;
1443 stm32_cryp_write(cryp, CRYP_CR, cfg);
1444
1445 /* b) pad and write the last block */
1446 stm32_cryp_irq_write_block(cryp);
1447 cryp->total_in = total_in_ori;
1448 err = stm32_cryp_wait_output(cryp);
1449 if (err) {
1450 dev_err(cryp->dev, "Timeout (wite ccm padded data)\n");
1451 return stm32_cryp_finish_req(cryp, err);
1452 }
1453
1454 /* c) get and store decrypted data */
1455 last_total_out = cryp->total_out;
1456 stm32_cryp_irq_read_data(cryp);
1457
1458 memset(tmp, 0, sizeof(tmp));
1459 scatterwalk_map_and_copy(tmp, out_sg_ori,
1460 cryp->total_out_save - last_total_out,
1461 last_total_out, 0);
1462
1463 /* d) Load again CRYP_CSGCMCCMxR */
1464 for (i = 0; i < ARRAY_SIZE(cstmp2); i++)
1465 cstmp2[i] = stm32_cryp_read(cryp, CRYP_CSGCMCCM0R + i * 4);
1466
1467 /* e) change mode back to AES CCM */
1468 cfg &= ~CR_ALGO_MASK;
1469 cfg |= CR_AES_CCM;
1470 stm32_cryp_write(cryp, CRYP_CR, cfg);
1471
1472 /* f) change phase to header */
1473 cfg &= ~CR_PH_MASK;
1474 cfg |= CR_PH_HEADER;
1475 stm32_cryp_write(cryp, CRYP_CR, cfg);
1476
1477 /* g) XOR and write padded data */
1478 for (i = 0; i < ARRAY_SIZE(tmp); i++) {
1479 tmp[i] ^= cstmp1[i];
1480 tmp[i] ^= cstmp2[i];
1481 stm32_cryp_write(cryp, CRYP_DIN, tmp[i]);
1482 }
1483
1484 /* h) wait for completion */
1485 err = stm32_cryp_wait_busy(cryp);
1486 if (err)
1487 dev_err(cryp->dev, "Timeout (wite ccm padded data)\n");
1488
1489 /* i) run the he normal Final phase */
1490 stm32_cryp_finish_req(cryp, err);
1491}
1492
1493static void stm32_cryp_irq_write_data(struct stm32_cryp *cryp)
1494{
1495 if (unlikely(!cryp->total_in)) {
1496 dev_warn(cryp->dev, "No more data to process\n");
1497 return;
1498 }
1499
1500 if (unlikely(cryp->total_in < AES_BLOCK_SIZE &&
1501 (stm32_cryp_get_hw_mode(cryp) == CR_AES_GCM) &&
1502 is_encrypt(cryp))) {
1503 /* Padding for AES GCM encryption */
1504 if (cryp->caps->padding_wa)
1505 /* Special case 1 */
1506 return stm32_cryp_irq_write_gcm_padded_data(cryp);
1507
1508 /* Setting padding bytes (NBBLB) */
1509 stm32_cryp_irq_set_npblb(cryp);
1510 }
1511
1512 if (unlikely((cryp->total_in - cryp->authsize < AES_BLOCK_SIZE) &&
1513 (stm32_cryp_get_hw_mode(cryp) == CR_AES_CCM) &&
1514 is_decrypt(cryp))) {
1515 /* Padding for AES CCM decryption */
1516 if (cryp->caps->padding_wa)
1517 /* Special case 2 */
1518 return stm32_cryp_irq_write_ccm_padded_data(cryp);
1519
1520 /* Setting padding bytes (NBBLB) */
1521 stm32_cryp_irq_set_npblb(cryp);
1522 }
1523
1524 if (is_aes(cryp) && is_ctr(cryp))
1525 stm32_cryp_check_ctr_counter(cryp);
1526
1527 stm32_cryp_irq_write_block(cryp);
1528}
1529
1530static void stm32_cryp_irq_write_gcm_header(struct stm32_cryp *cryp)
1531{
1532 int err;
1533 unsigned int i, j;
1534 u32 cfg, *src;
1535
1536 src = sg_virt(cryp->in_sg) + _walked_in;
1537
1538 for (i = 0; i < AES_BLOCK_32; i++) {
1539 stm32_cryp_write(cryp, CRYP_DIN, *src);
1540
1541 src = stm32_cryp_next_in(cryp, src, sizeof(u32));
1542 cryp->total_in -= min_t(size_t, sizeof(u32), cryp->total_in);
1543
1544 /* Check if whole header written */
1545 if ((cryp->total_in_save - cryp->total_in) ==
1546 cryp->areq->assoclen) {
1547 /* Write padding if needed */
1548 for (j = i + 1; j < AES_BLOCK_32; j++)
1549 stm32_cryp_write(cryp, CRYP_DIN, 0);
1550
1551 /* Wait for completion */
1552 err = stm32_cryp_wait_busy(cryp);
1553 if (err) {
1554 dev_err(cryp->dev, "Timeout (gcm header)\n");
1555 return stm32_cryp_finish_req(cryp, err);
1556 }
1557
1558 if (stm32_cryp_get_input_text_len(cryp)) {
1559 /* Phase 3 : payload */
1560 cfg = stm32_cryp_read(cryp, CRYP_CR);
1561 cfg &= ~CR_CRYPEN;
1562 stm32_cryp_write(cryp, CRYP_CR, cfg);
1563
1564 cfg &= ~CR_PH_MASK;
1565 cfg |= CR_PH_PAYLOAD;
1566 cfg |= CR_CRYPEN;
1567 stm32_cryp_write(cryp, CRYP_CR, cfg);
1568 } else {
1569 /* Phase 4 : tag */
1570 stm32_cryp_write(cryp, CRYP_IMSCR, 0);
1571 stm32_cryp_finish_req(cryp, 0);
1572 }
1573
1574 break;
1575 }
1576
1577 if (!cryp->total_in)
1578 break;
1579 }
1580}
1581
1582static void stm32_cryp_irq_write_ccm_header(struct stm32_cryp *cryp)
1583{
1584 int err;
1585 unsigned int i = 0, j, k;
1586 u32 alen, cfg, *src;
1587 u8 d8[4];
1588
1589 src = sg_virt(cryp->in_sg) + _walked_in;
1590 alen = cryp->areq->assoclen;
1591
1592 if (!_walked_in) {
1593 if (cryp->areq->assoclen <= 65280) {
1594 /* Write first u32 of B1 */
1595 d8[0] = (alen >> 8) & 0xFF;
1596 d8[1] = alen & 0xFF;
1597 d8[2] = *((u8 *)src);
1598 src = stm32_cryp_next_in(cryp, src, 1);
1599 d8[3] = *((u8 *)src);
1600 src = stm32_cryp_next_in(cryp, src, 1);
1601
1602 stm32_cryp_write(cryp, CRYP_DIN, *(u32 *)d8);
1603 i++;
1604
1605 cryp->total_in -= min_t(size_t, 2, cryp->total_in);
1606 } else {
1607 /* Build the two first u32 of B1 */
1608 d8[0] = 0xFF;
1609 d8[1] = 0xFE;
1610 d8[2] = alen & 0xFF000000;
1611 d8[3] = alen & 0x00FF0000;
1612
1613 stm32_cryp_write(cryp, CRYP_DIN, *(u32 *)d8);
1614 i++;
1615
1616 d8[0] = alen & 0x0000FF00;
1617 d8[1] = alen & 0x000000FF;
1618 d8[2] = *((u8 *)src);
1619 src = stm32_cryp_next_in(cryp, src, 1);
1620 d8[3] = *((u8 *)src);
1621 src = stm32_cryp_next_in(cryp, src, 1);
1622
1623 stm32_cryp_write(cryp, CRYP_DIN, *(u32 *)d8);
1624 i++;
1625
1626 cryp->total_in -= min_t(size_t, 2, cryp->total_in);
1627 }
1628 }
1629
1630 /* Write next u32 */
1631 for (; i < AES_BLOCK_32; i++) {
1632 /* Build an u32 */
1633 memset(d8, 0, sizeof(u32));
1634 for (k = 0; k < sizeof(u32); k++) {
1635 d8[k] = *((u8 *)src);
1636 src = stm32_cryp_next_in(cryp, src, 1);
1637
1638 cryp->total_in -= min_t(size_t, 1, cryp->total_in);
1639 if ((cryp->total_in_save - cryp->total_in) == alen)
1640 break;
1641 }
1642
1643 stm32_cryp_write(cryp, CRYP_DIN, *(u32 *)d8);
1644
1645 if ((cryp->total_in_save - cryp->total_in) == alen) {
1646 /* Write padding if needed */
1647 for (j = i + 1; j < AES_BLOCK_32; j++)
1648 stm32_cryp_write(cryp, CRYP_DIN, 0);
1649
1650 /* Wait for completion */
1651 err = stm32_cryp_wait_busy(cryp);
1652 if (err) {
1653 dev_err(cryp->dev, "Timeout (ccm header)\n");
1654 return stm32_cryp_finish_req(cryp, err);
1655 }
1656
1657 if (stm32_cryp_get_input_text_len(cryp)) {
1658 /* Phase 3 : payload */
1659 cfg = stm32_cryp_read(cryp, CRYP_CR);
1660 cfg &= ~CR_CRYPEN;
1661 stm32_cryp_write(cryp, CRYP_CR, cfg);
1662
1663 cfg &= ~CR_PH_MASK;
1664 cfg |= CR_PH_PAYLOAD;
1665 cfg |= CR_CRYPEN;
1666 stm32_cryp_write(cryp, CRYP_CR, cfg);
1667 } else {
1668 /* Phase 4 : tag */
1669 stm32_cryp_write(cryp, CRYP_IMSCR, 0);
1670 stm32_cryp_finish_req(cryp, 0);
1671 }
1672
1673 break;
1674 }
1675 }
1676}
1677
1678static irqreturn_t stm32_cryp_irq_thread(int irq, void *arg)
1679{
1680 struct stm32_cryp *cryp = arg;
1681 u32 ph;
1682
1683 if (cryp->irq_status & MISR_OUT)
1684 /* Output FIFO IRQ: read data */
1685 if (unlikely(stm32_cryp_irq_read_data(cryp))) {
1686 /* All bytes processed, finish */
1687 stm32_cryp_write(cryp, CRYP_IMSCR, 0);
1688 stm32_cryp_finish_req(cryp, 0);
1689 return IRQ_HANDLED;
1690 }
1691
1692 if (cryp->irq_status & MISR_IN) {
1693 if (is_gcm(cryp)) {
1694 ph = stm32_cryp_read(cryp, CRYP_CR) & CR_PH_MASK;
1695 if (unlikely(ph == CR_PH_HEADER))
1696 /* Write Header */
1697 stm32_cryp_irq_write_gcm_header(cryp);
1698 else
1699 /* Input FIFO IRQ: write data */
1700 stm32_cryp_irq_write_data(cryp);
1701 cryp->gcm_ctr++;
1702 } else if (is_ccm(cryp)) {
1703 ph = stm32_cryp_read(cryp, CRYP_CR) & CR_PH_MASK;
1704 if (unlikely(ph == CR_PH_HEADER))
1705 /* Write Header */
1706 stm32_cryp_irq_write_ccm_header(cryp);
1707 else
1708 /* Input FIFO IRQ: write data */
1709 stm32_cryp_irq_write_data(cryp);
1710 } else {
1711 /* Input FIFO IRQ: write data */
1712 stm32_cryp_irq_write_data(cryp);
1713 }
1714 }
1715
1716 return IRQ_HANDLED;
1717}
1718
1719static irqreturn_t stm32_cryp_irq(int irq, void *arg)
1720{
1721 struct stm32_cryp *cryp = arg;
1722
1723 cryp->irq_status = stm32_cryp_read(cryp, CRYP_MISR);
1724
1725 return IRQ_WAKE_THREAD;
1726}
1727
1728static struct skcipher_alg crypto_algs[] = {
1729{
1730 .base.cra_name = "ecb(aes)",
1731 .base.cra_driver_name = "stm32-ecb-aes",
1732 .base.cra_priority = 200,
1733 .base.cra_flags = CRYPTO_ALG_ASYNC,
1734 .base.cra_blocksize = AES_BLOCK_SIZE,
1735 .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
1736 .base.cra_alignmask = 0xf,
1737 .base.cra_module = THIS_MODULE,
1738
1739 .init = stm32_cryp_init_tfm,
1740 .min_keysize = AES_MIN_KEY_SIZE,
1741 .max_keysize = AES_MAX_KEY_SIZE,
1742 .setkey = stm32_cryp_aes_setkey,
1743 .encrypt = stm32_cryp_aes_ecb_encrypt,
1744 .decrypt = stm32_cryp_aes_ecb_decrypt,
1745},
1746{
1747 .base.cra_name = "cbc(aes)",
1748 .base.cra_driver_name = "stm32-cbc-aes",
1749 .base.cra_priority = 200,
1750 .base.cra_flags = CRYPTO_ALG_ASYNC,
1751 .base.cra_blocksize = AES_BLOCK_SIZE,
1752 .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
1753 .base.cra_alignmask = 0xf,
1754 .base.cra_module = THIS_MODULE,
1755
1756 .init = stm32_cryp_init_tfm,
1757 .min_keysize = AES_MIN_KEY_SIZE,
1758 .max_keysize = AES_MAX_KEY_SIZE,
1759 .ivsize = AES_BLOCK_SIZE,
1760 .setkey = stm32_cryp_aes_setkey,
1761 .encrypt = stm32_cryp_aes_cbc_encrypt,
1762 .decrypt = stm32_cryp_aes_cbc_decrypt,
1763},
1764{
1765 .base.cra_name = "ctr(aes)",
1766 .base.cra_driver_name = "stm32-ctr-aes",
1767 .base.cra_priority = 200,
1768 .base.cra_flags = CRYPTO_ALG_ASYNC,
1769 .base.cra_blocksize = 1,
1770 .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
1771 .base.cra_alignmask = 0xf,
1772 .base.cra_module = THIS_MODULE,
1773
1774 .init = stm32_cryp_init_tfm,
1775 .min_keysize = AES_MIN_KEY_SIZE,
1776 .max_keysize = AES_MAX_KEY_SIZE,
1777 .ivsize = AES_BLOCK_SIZE,
1778 .setkey = stm32_cryp_aes_setkey,
1779 .encrypt = stm32_cryp_aes_ctr_encrypt,
1780 .decrypt = stm32_cryp_aes_ctr_decrypt,
1781},
1782{
1783 .base.cra_name = "ecb(des)",
1784 .base.cra_driver_name = "stm32-ecb-des",
1785 .base.cra_priority = 200,
1786 .base.cra_flags = CRYPTO_ALG_ASYNC,
1787 .base.cra_blocksize = DES_BLOCK_SIZE,
1788 .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
1789 .base.cra_alignmask = 0xf,
1790 .base.cra_module = THIS_MODULE,
1791
1792 .init = stm32_cryp_init_tfm,
1793 .min_keysize = DES_BLOCK_SIZE,
1794 .max_keysize = DES_BLOCK_SIZE,
1795 .setkey = stm32_cryp_des_setkey,
1796 .encrypt = stm32_cryp_des_ecb_encrypt,
1797 .decrypt = stm32_cryp_des_ecb_decrypt,
1798},
1799{
1800 .base.cra_name = "cbc(des)",
1801 .base.cra_driver_name = "stm32-cbc-des",
1802 .base.cra_priority = 200,
1803 .base.cra_flags = CRYPTO_ALG_ASYNC,
1804 .base.cra_blocksize = DES_BLOCK_SIZE,
1805 .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
1806 .base.cra_alignmask = 0xf,
1807 .base.cra_module = THIS_MODULE,
1808
1809 .init = stm32_cryp_init_tfm,
1810 .min_keysize = DES_BLOCK_SIZE,
1811 .max_keysize = DES_BLOCK_SIZE,
1812 .ivsize = DES_BLOCK_SIZE,
1813 .setkey = stm32_cryp_des_setkey,
1814 .encrypt = stm32_cryp_des_cbc_encrypt,
1815 .decrypt = stm32_cryp_des_cbc_decrypt,
1816},
1817{
1818 .base.cra_name = "ecb(des3_ede)",
1819 .base.cra_driver_name = "stm32-ecb-des3",
1820 .base.cra_priority = 200,
1821 .base.cra_flags = CRYPTO_ALG_ASYNC,
1822 .base.cra_blocksize = DES_BLOCK_SIZE,
1823 .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
1824 .base.cra_alignmask = 0xf,
1825 .base.cra_module = THIS_MODULE,
1826
1827 .init = stm32_cryp_init_tfm,
1828 .min_keysize = 3 * DES_BLOCK_SIZE,
1829 .max_keysize = 3 * DES_BLOCK_SIZE,
1830 .setkey = stm32_cryp_tdes_setkey,
1831 .encrypt = stm32_cryp_tdes_ecb_encrypt,
1832 .decrypt = stm32_cryp_tdes_ecb_decrypt,
1833},
1834{
1835 .base.cra_name = "cbc(des3_ede)",
1836 .base.cra_driver_name = "stm32-cbc-des3",
1837 .base.cra_priority = 200,
1838 .base.cra_flags = CRYPTO_ALG_ASYNC,
1839 .base.cra_blocksize = DES_BLOCK_SIZE,
1840 .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
1841 .base.cra_alignmask = 0xf,
1842 .base.cra_module = THIS_MODULE,
1843
1844 .init = stm32_cryp_init_tfm,
1845 .min_keysize = 3 * DES_BLOCK_SIZE,
1846 .max_keysize = 3 * DES_BLOCK_SIZE,
1847 .ivsize = DES_BLOCK_SIZE,
1848 .setkey = stm32_cryp_tdes_setkey,
1849 .encrypt = stm32_cryp_tdes_cbc_encrypt,
1850 .decrypt = stm32_cryp_tdes_cbc_decrypt,
1851},
1852};
1853
1854static struct aead_alg aead_algs[] = {
1855{
1856 .setkey = stm32_cryp_aes_aead_setkey,
1857 .setauthsize = stm32_cryp_aes_gcm_setauthsize,
1858 .encrypt = stm32_cryp_aes_gcm_encrypt,
1859 .decrypt = stm32_cryp_aes_gcm_decrypt,
1860 .init = stm32_cryp_aes_aead_init,
1861 .ivsize = 12,
1862 .maxauthsize = AES_BLOCK_SIZE,
1863
1864 .base = {
1865 .cra_name = "gcm(aes)",
1866 .cra_driver_name = "stm32-gcm-aes",
1867 .cra_priority = 200,
1868 .cra_flags = CRYPTO_ALG_ASYNC,
1869 .cra_blocksize = 1,
1870 .cra_ctxsize = sizeof(struct stm32_cryp_ctx),
1871 .cra_alignmask = 0xf,
1872 .cra_module = THIS_MODULE,
1873 },
1874},
1875{
1876 .setkey = stm32_cryp_aes_aead_setkey,
1877 .setauthsize = stm32_cryp_aes_ccm_setauthsize,
1878 .encrypt = stm32_cryp_aes_ccm_encrypt,
1879 .decrypt = stm32_cryp_aes_ccm_decrypt,
1880 .init = stm32_cryp_aes_aead_init,
1881 .ivsize = AES_BLOCK_SIZE,
1882 .maxauthsize = AES_BLOCK_SIZE,
1883
1884 .base = {
1885 .cra_name = "ccm(aes)",
1886 .cra_driver_name = "stm32-ccm-aes",
1887 .cra_priority = 200,
1888 .cra_flags = CRYPTO_ALG_ASYNC,
1889 .cra_blocksize = 1,
1890 .cra_ctxsize = sizeof(struct stm32_cryp_ctx),
1891 .cra_alignmask = 0xf,
1892 .cra_module = THIS_MODULE,
1893 },
1894},
1895};
1896
1897static const struct stm32_cryp_caps f7_data = {
1898 .swap_final = true,
1899 .padding_wa = true,
1900};
1901
1902static const struct stm32_cryp_caps mp1_data = {
1903 .swap_final = false,
1904 .padding_wa = false,
1905};
1906
1907static const struct of_device_id stm32_dt_ids[] = {
1908 { .compatible = "st,stm32f756-cryp", .data = &f7_data},
1909 { .compatible = "st,stm32mp1-cryp", .data = &mp1_data},
1910 {},
1911};
1912MODULE_DEVICE_TABLE(of, stm32_dt_ids);
1913
1914static int stm32_cryp_probe(struct platform_device *pdev)
1915{
1916 struct device *dev = &pdev->dev;
1917 struct stm32_cryp *cryp;
1918 struct reset_control *rst;
1919 int irq, ret;
1920
1921 cryp = devm_kzalloc(dev, sizeof(*cryp), GFP_KERNEL);
1922 if (!cryp)
1923 return -ENOMEM;
1924
1925 cryp->caps = of_device_get_match_data(dev);
1926 if (!cryp->caps)
1927 return -ENODEV;
1928
1929 cryp->dev = dev;
1930
1931 cryp->regs = devm_platform_ioremap_resource(pdev, 0);
1932 if (IS_ERR(cryp->regs))
1933 return PTR_ERR(cryp->regs);
1934
1935 irq = platform_get_irq(pdev, 0);
1936 if (irq < 0)
1937 return irq;
1938
1939 ret = devm_request_threaded_irq(dev, irq, stm32_cryp_irq,
1940 stm32_cryp_irq_thread, IRQF_ONESHOT,
1941 dev_name(dev), cryp);
1942 if (ret) {
1943 dev_err(dev, "Cannot grab IRQ\n");
1944 return ret;
1945 }
1946
1947 cryp->clk = devm_clk_get(dev, NULL);
1948 if (IS_ERR(cryp->clk)) {
1949 dev_err(dev, "Could not get clock\n");
1950 return PTR_ERR(cryp->clk);
1951 }
1952
1953 ret = clk_prepare_enable(cryp->clk);
1954 if (ret) {
1955 dev_err(cryp->dev, "Failed to enable clock\n");
1956 return ret;
1957 }
1958
1959 pm_runtime_set_autosuspend_delay(dev, CRYP_AUTOSUSPEND_DELAY);
1960 pm_runtime_use_autosuspend(dev);
1961
1962 pm_runtime_get_noresume(dev);
1963 pm_runtime_set_active(dev);
1964 pm_runtime_enable(dev);
1965
1966 rst = devm_reset_control_get(dev, NULL);
1967 if (!IS_ERR(rst)) {
1968 reset_control_assert(rst);
1969 udelay(2);
1970 reset_control_deassert(rst);
1971 }
1972
1973 platform_set_drvdata(pdev, cryp);
1974
1975 spin_lock(&cryp_list.lock);
1976 list_add(&cryp->list, &cryp_list.dev_list);
1977 spin_unlock(&cryp_list.lock);
1978
1979 /* Initialize crypto engine */
1980 cryp->engine = crypto_engine_alloc_init(dev, 1);
1981 if (!cryp->engine) {
1982 dev_err(dev, "Could not init crypto engine\n");
1983 ret = -ENOMEM;
1984 goto err_engine1;
1985 }
1986
1987 ret = crypto_engine_start(cryp->engine);
1988 if (ret) {
1989 dev_err(dev, "Could not start crypto engine\n");
1990 goto err_engine2;
1991 }
1992
1993 ret = crypto_register_skciphers(crypto_algs, ARRAY_SIZE(crypto_algs));
1994 if (ret) {
1995 dev_err(dev, "Could not register algs\n");
1996 goto err_algs;
1997 }
1998
1999 ret = crypto_register_aeads(aead_algs, ARRAY_SIZE(aead_algs));
2000 if (ret)
2001 goto err_aead_algs;
2002
2003 dev_info(dev, "Initialized\n");
2004
2005 pm_runtime_put_sync(dev);
2006
2007 return 0;
2008
2009err_aead_algs:
2010 crypto_unregister_skciphers(crypto_algs, ARRAY_SIZE(crypto_algs));
2011err_algs:
2012err_engine2:
2013 crypto_engine_exit(cryp->engine);
2014err_engine1:
2015 spin_lock(&cryp_list.lock);
2016 list_del(&cryp->list);
2017 spin_unlock(&cryp_list.lock);
2018
2019 pm_runtime_disable(dev);
2020 pm_runtime_put_noidle(dev);
2021 pm_runtime_disable(dev);
2022 pm_runtime_put_noidle(dev);
2023
2024 clk_disable_unprepare(cryp->clk);
2025
2026 return ret;
2027}
2028
2029static int stm32_cryp_remove(struct platform_device *pdev)
2030{
2031 struct stm32_cryp *cryp = platform_get_drvdata(pdev);
2032 int ret;
2033
2034 if (!cryp)
2035 return -ENODEV;
2036
2037 ret = pm_runtime_get_sync(cryp->dev);
2038 if (ret < 0)
2039 return ret;
2040
2041 crypto_unregister_aeads(aead_algs, ARRAY_SIZE(aead_algs));
2042 crypto_unregister_skciphers(crypto_algs, ARRAY_SIZE(crypto_algs));
2043
2044 crypto_engine_exit(cryp->engine);
2045
2046 spin_lock(&cryp_list.lock);
2047 list_del(&cryp->list);
2048 spin_unlock(&cryp_list.lock);
2049
2050 pm_runtime_disable(cryp->dev);
2051 pm_runtime_put_noidle(cryp->dev);
2052
2053 clk_disable_unprepare(cryp->clk);
2054
2055 return 0;
2056}
2057
2058#ifdef CONFIG_PM
2059static int stm32_cryp_runtime_suspend(struct device *dev)
2060{
2061 struct stm32_cryp *cryp = dev_get_drvdata(dev);
2062
2063 clk_disable_unprepare(cryp->clk);
2064
2065 return 0;
2066}
2067
2068static int stm32_cryp_runtime_resume(struct device *dev)
2069{
2070 struct stm32_cryp *cryp = dev_get_drvdata(dev);
2071 int ret;
2072
2073 ret = clk_prepare_enable(cryp->clk);
2074 if (ret) {
2075 dev_err(cryp->dev, "Failed to prepare_enable clock\n");
2076 return ret;
2077 }
2078
2079 return 0;
2080}
2081#endif
2082
2083static const struct dev_pm_ops stm32_cryp_pm_ops = {
2084 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
2085 pm_runtime_force_resume)
2086 SET_RUNTIME_PM_OPS(stm32_cryp_runtime_suspend,
2087 stm32_cryp_runtime_resume, NULL)
2088};
2089
2090static struct platform_driver stm32_cryp_driver = {
2091 .probe = stm32_cryp_probe,
2092 .remove = stm32_cryp_remove,
2093 .driver = {
2094 .name = DRIVER_NAME,
2095 .pm = &stm32_cryp_pm_ops,
2096 .of_match_table = stm32_dt_ids,
2097 },
2098};
2099
2100module_platform_driver(stm32_cryp_driver);
2101
2102MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
2103MODULE_DESCRIPTION("STMicrolectronics STM32 CRYP hardware driver");
2104MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) STMicroelectronics SA 2017
4 * Author: Fabien Dessenne <fabien.dessenne@st.com>
5 * Ux500 support taken from snippets in the old Ux500 cryp driver
6 */
7
8#include <linux/clk.h>
9#include <linux/delay.h>
10#include <linux/interrupt.h>
11#include <linux/iopoll.h>
12#include <linux/module.h>
13#include <linux/of_device.h>
14#include <linux/platform_device.h>
15#include <linux/pm_runtime.h>
16#include <linux/reset.h>
17
18#include <crypto/aes.h>
19#include <crypto/internal/des.h>
20#include <crypto/engine.h>
21#include <crypto/scatterwalk.h>
22#include <crypto/internal/aead.h>
23#include <crypto/internal/skcipher.h>
24
25#define DRIVER_NAME "stm32-cryp"
26
27/* Bit [0] encrypt / decrypt */
28#define FLG_ENCRYPT BIT(0)
29/* Bit [8..1] algo & operation mode */
30#define FLG_AES BIT(1)
31#define FLG_DES BIT(2)
32#define FLG_TDES BIT(3)
33#define FLG_ECB BIT(4)
34#define FLG_CBC BIT(5)
35#define FLG_CTR BIT(6)
36#define FLG_GCM BIT(7)
37#define FLG_CCM BIT(8)
38/* Mode mask = bits [15..0] */
39#define FLG_MODE_MASK GENMASK(15, 0)
40/* Bit [31..16] status */
41
42/* Registers */
43#define CRYP_CR 0x00000000
44#define CRYP_SR 0x00000004
45#define CRYP_DIN 0x00000008
46#define CRYP_DOUT 0x0000000C
47#define CRYP_DMACR 0x00000010
48#define CRYP_IMSCR 0x00000014
49#define CRYP_RISR 0x00000018
50#define CRYP_MISR 0x0000001C
51#define CRYP_K0LR 0x00000020
52#define CRYP_K0RR 0x00000024
53#define CRYP_K1LR 0x00000028
54#define CRYP_K1RR 0x0000002C
55#define CRYP_K2LR 0x00000030
56#define CRYP_K2RR 0x00000034
57#define CRYP_K3LR 0x00000038
58#define CRYP_K3RR 0x0000003C
59#define CRYP_IV0LR 0x00000040
60#define CRYP_IV0RR 0x00000044
61#define CRYP_IV1LR 0x00000048
62#define CRYP_IV1RR 0x0000004C
63#define CRYP_CSGCMCCM0R 0x00000050
64#define CRYP_CSGCM0R 0x00000070
65
66#define UX500_CRYP_CR 0x00000000
67#define UX500_CRYP_SR 0x00000004
68#define UX500_CRYP_DIN 0x00000008
69#define UX500_CRYP_DINSIZE 0x0000000C
70#define UX500_CRYP_DOUT 0x00000010
71#define UX500_CRYP_DOUSIZE 0x00000014
72#define UX500_CRYP_DMACR 0x00000018
73#define UX500_CRYP_IMSC 0x0000001C
74#define UX500_CRYP_RIS 0x00000020
75#define UX500_CRYP_MIS 0x00000024
76#define UX500_CRYP_K1L 0x00000028
77#define UX500_CRYP_K1R 0x0000002C
78#define UX500_CRYP_K2L 0x00000030
79#define UX500_CRYP_K2R 0x00000034
80#define UX500_CRYP_K3L 0x00000038
81#define UX500_CRYP_K3R 0x0000003C
82#define UX500_CRYP_K4L 0x00000040
83#define UX500_CRYP_K4R 0x00000044
84#define UX500_CRYP_IV0L 0x00000048
85#define UX500_CRYP_IV0R 0x0000004C
86#define UX500_CRYP_IV1L 0x00000050
87#define UX500_CRYP_IV1R 0x00000054
88
89/* Registers values */
90#define CR_DEC_NOT_ENC 0x00000004
91#define CR_TDES_ECB 0x00000000
92#define CR_TDES_CBC 0x00000008
93#define CR_DES_ECB 0x00000010
94#define CR_DES_CBC 0x00000018
95#define CR_AES_ECB 0x00000020
96#define CR_AES_CBC 0x00000028
97#define CR_AES_CTR 0x00000030
98#define CR_AES_KP 0x00000038 /* Not on Ux500 */
99#define CR_AES_XTS 0x00000038 /* Only on Ux500 */
100#define CR_AES_GCM 0x00080000
101#define CR_AES_CCM 0x00080008
102#define CR_AES_UNKNOWN 0xFFFFFFFF
103#define CR_ALGO_MASK 0x00080038
104#define CR_DATA32 0x00000000
105#define CR_DATA16 0x00000040
106#define CR_DATA8 0x00000080
107#define CR_DATA1 0x000000C0
108#define CR_KEY128 0x00000000
109#define CR_KEY192 0x00000100
110#define CR_KEY256 0x00000200
111#define CR_KEYRDEN 0x00000400 /* Only on Ux500 */
112#define CR_KSE 0x00000800 /* Only on Ux500 */
113#define CR_FFLUSH 0x00004000
114#define CR_CRYPEN 0x00008000
115#define CR_PH_INIT 0x00000000
116#define CR_PH_HEADER 0x00010000
117#define CR_PH_PAYLOAD 0x00020000
118#define CR_PH_FINAL 0x00030000
119#define CR_PH_MASK 0x00030000
120#define CR_NBPBL_SHIFT 20
121
122#define SR_BUSY 0x00000010
123#define SR_OFNE 0x00000004
124
125#define IMSCR_IN BIT(0)
126#define IMSCR_OUT BIT(1)
127
128#define MISR_IN BIT(0)
129#define MISR_OUT BIT(1)
130
131/* Misc */
132#define AES_BLOCK_32 (AES_BLOCK_SIZE / sizeof(u32))
133#define GCM_CTR_INIT 2
134#define CRYP_AUTOSUSPEND_DELAY 50
135
136struct stm32_cryp_caps {
137 bool aeads_support;
138 bool linear_aes_key;
139 bool kp_mode;
140 bool iv_protection;
141 bool swap_final;
142 bool padding_wa;
143 u32 cr;
144 u32 sr;
145 u32 din;
146 u32 dout;
147 u32 imsc;
148 u32 mis;
149 u32 k1l;
150 u32 k1r;
151 u32 k3r;
152 u32 iv0l;
153 u32 iv0r;
154 u32 iv1l;
155 u32 iv1r;
156};
157
158struct stm32_cryp_ctx {
159 struct crypto_engine_ctx enginectx;
160 struct stm32_cryp *cryp;
161 int keylen;
162 __be32 key[AES_KEYSIZE_256 / sizeof(u32)];
163 unsigned long flags;
164};
165
166struct stm32_cryp_reqctx {
167 unsigned long mode;
168};
169
170struct stm32_cryp {
171 struct list_head list;
172 struct device *dev;
173 void __iomem *regs;
174 struct clk *clk;
175 unsigned long flags;
176 u32 irq_status;
177 const struct stm32_cryp_caps *caps;
178 struct stm32_cryp_ctx *ctx;
179
180 struct crypto_engine *engine;
181
182 struct skcipher_request *req;
183 struct aead_request *areq;
184
185 size_t authsize;
186 size_t hw_blocksize;
187
188 size_t payload_in;
189 size_t header_in;
190 size_t payload_out;
191
192 struct scatterlist *out_sg;
193
194 struct scatter_walk in_walk;
195 struct scatter_walk out_walk;
196
197 __be32 last_ctr[4];
198 u32 gcm_ctr;
199};
200
201struct stm32_cryp_list {
202 struct list_head dev_list;
203 spinlock_t lock; /* protect dev_list */
204};
205
206static struct stm32_cryp_list cryp_list = {
207 .dev_list = LIST_HEAD_INIT(cryp_list.dev_list),
208 .lock = __SPIN_LOCK_UNLOCKED(cryp_list.lock),
209};
210
211static inline bool is_aes(struct stm32_cryp *cryp)
212{
213 return cryp->flags & FLG_AES;
214}
215
216static inline bool is_des(struct stm32_cryp *cryp)
217{
218 return cryp->flags & FLG_DES;
219}
220
221static inline bool is_tdes(struct stm32_cryp *cryp)
222{
223 return cryp->flags & FLG_TDES;
224}
225
226static inline bool is_ecb(struct stm32_cryp *cryp)
227{
228 return cryp->flags & FLG_ECB;
229}
230
231static inline bool is_cbc(struct stm32_cryp *cryp)
232{
233 return cryp->flags & FLG_CBC;
234}
235
236static inline bool is_ctr(struct stm32_cryp *cryp)
237{
238 return cryp->flags & FLG_CTR;
239}
240
241static inline bool is_gcm(struct stm32_cryp *cryp)
242{
243 return cryp->flags & FLG_GCM;
244}
245
246static inline bool is_ccm(struct stm32_cryp *cryp)
247{
248 return cryp->flags & FLG_CCM;
249}
250
251static inline bool is_encrypt(struct stm32_cryp *cryp)
252{
253 return cryp->flags & FLG_ENCRYPT;
254}
255
256static inline bool is_decrypt(struct stm32_cryp *cryp)
257{
258 return !is_encrypt(cryp);
259}
260
261static inline u32 stm32_cryp_read(struct stm32_cryp *cryp, u32 ofst)
262{
263 return readl_relaxed(cryp->regs + ofst);
264}
265
266static inline void stm32_cryp_write(struct stm32_cryp *cryp, u32 ofst, u32 val)
267{
268 writel_relaxed(val, cryp->regs + ofst);
269}
270
271static inline int stm32_cryp_wait_busy(struct stm32_cryp *cryp)
272{
273 u32 status;
274
275 return readl_relaxed_poll_timeout(cryp->regs + cryp->caps->sr, status,
276 !(status & SR_BUSY), 10, 100000);
277}
278
279static inline void stm32_cryp_enable(struct stm32_cryp *cryp)
280{
281 writel_relaxed(readl_relaxed(cryp->regs + cryp->caps->cr) | CR_CRYPEN,
282 cryp->regs + cryp->caps->cr);
283}
284
285static inline int stm32_cryp_wait_enable(struct stm32_cryp *cryp)
286{
287 u32 status;
288
289 return readl_relaxed_poll_timeout(cryp->regs + cryp->caps->cr, status,
290 !(status & CR_CRYPEN), 10, 100000);
291}
292
293static inline int stm32_cryp_wait_output(struct stm32_cryp *cryp)
294{
295 u32 status;
296
297 return readl_relaxed_poll_timeout(cryp->regs + cryp->caps->sr, status,
298 status & SR_OFNE, 10, 100000);
299}
300
301static inline void stm32_cryp_key_read_enable(struct stm32_cryp *cryp)
302{
303 writel_relaxed(readl_relaxed(cryp->regs + cryp->caps->cr) | CR_KEYRDEN,
304 cryp->regs + cryp->caps->cr);
305}
306
307static inline void stm32_cryp_key_read_disable(struct stm32_cryp *cryp)
308{
309 writel_relaxed(readl_relaxed(cryp->regs + cryp->caps->cr) & ~CR_KEYRDEN,
310 cryp->regs + cryp->caps->cr);
311}
312
313static int stm32_cryp_read_auth_tag(struct stm32_cryp *cryp);
314static void stm32_cryp_finish_req(struct stm32_cryp *cryp, int err);
315
316static struct stm32_cryp *stm32_cryp_find_dev(struct stm32_cryp_ctx *ctx)
317{
318 struct stm32_cryp *tmp, *cryp = NULL;
319
320 spin_lock_bh(&cryp_list.lock);
321 if (!ctx->cryp) {
322 list_for_each_entry(tmp, &cryp_list.dev_list, list) {
323 cryp = tmp;
324 break;
325 }
326 ctx->cryp = cryp;
327 } else {
328 cryp = ctx->cryp;
329 }
330
331 spin_unlock_bh(&cryp_list.lock);
332
333 return cryp;
334}
335
336static void stm32_cryp_hw_write_iv(struct stm32_cryp *cryp, __be32 *iv)
337{
338 if (!iv)
339 return;
340
341 stm32_cryp_write(cryp, cryp->caps->iv0l, be32_to_cpu(*iv++));
342 stm32_cryp_write(cryp, cryp->caps->iv0r, be32_to_cpu(*iv++));
343
344 if (is_aes(cryp)) {
345 stm32_cryp_write(cryp, cryp->caps->iv1l, be32_to_cpu(*iv++));
346 stm32_cryp_write(cryp, cryp->caps->iv1r, be32_to_cpu(*iv++));
347 }
348}
349
350static void stm32_cryp_get_iv(struct stm32_cryp *cryp)
351{
352 struct skcipher_request *req = cryp->req;
353 __be32 *tmp = (void *)req->iv;
354
355 if (!tmp)
356 return;
357
358 if (cryp->caps->iv_protection)
359 stm32_cryp_key_read_enable(cryp);
360
361 *tmp++ = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv0l));
362 *tmp++ = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv0r));
363
364 if (is_aes(cryp)) {
365 *tmp++ = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv1l));
366 *tmp++ = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv1r));
367 }
368
369 if (cryp->caps->iv_protection)
370 stm32_cryp_key_read_disable(cryp);
371}
372
373/**
374 * ux500_swap_bits_in_byte() - mirror the bits in a byte
375 * @b: the byte to be mirrored
376 *
377 * The bits are swapped the following way:
378 * Byte b include bits 0-7, nibble 1 (n1) include bits 0-3 and
379 * nibble 2 (n2) bits 4-7.
380 *
381 * Nibble 1 (n1):
382 * (The "old" (moved) bit is replaced with a zero)
383 * 1. Move bit 6 and 7, 4 positions to the left.
384 * 2. Move bit 3 and 5, 2 positions to the left.
385 * 3. Move bit 1-4, 1 position to the left.
386 *
387 * Nibble 2 (n2):
388 * 1. Move bit 0 and 1, 4 positions to the right.
389 * 2. Move bit 2 and 4, 2 positions to the right.
390 * 3. Move bit 3-6, 1 position to the right.
391 *
392 * Combine the two nibbles to a complete and swapped byte.
393 */
394static inline u8 ux500_swap_bits_in_byte(u8 b)
395{
396#define R_SHIFT_4_MASK 0xc0 /* Bits 6 and 7, right shift 4 */
397#define R_SHIFT_2_MASK 0x28 /* (After right shift 4) Bits 3 and 5,
398 right shift 2 */
399#define R_SHIFT_1_MASK 0x1e /* (After right shift 2) Bits 1-4,
400 right shift 1 */
401#define L_SHIFT_4_MASK 0x03 /* Bits 0 and 1, left shift 4 */
402#define L_SHIFT_2_MASK 0x14 /* (After left shift 4) Bits 2 and 4,
403 left shift 2 */
404#define L_SHIFT_1_MASK 0x78 /* (After left shift 1) Bits 3-6,
405 left shift 1 */
406
407 u8 n1;
408 u8 n2;
409
410 /* Swap most significant nibble */
411 /* Right shift 4, bits 6 and 7 */
412 n1 = ((b & R_SHIFT_4_MASK) >> 4) | (b & ~(R_SHIFT_4_MASK >> 4));
413 /* Right shift 2, bits 3 and 5 */
414 n1 = ((n1 & R_SHIFT_2_MASK) >> 2) | (n1 & ~(R_SHIFT_2_MASK >> 2));
415 /* Right shift 1, bits 1-4 */
416 n1 = (n1 & R_SHIFT_1_MASK) >> 1;
417
418 /* Swap least significant nibble */
419 /* Left shift 4, bits 0 and 1 */
420 n2 = ((b & L_SHIFT_4_MASK) << 4) | (b & ~(L_SHIFT_4_MASK << 4));
421 /* Left shift 2, bits 2 and 4 */
422 n2 = ((n2 & L_SHIFT_2_MASK) << 2) | (n2 & ~(L_SHIFT_2_MASK << 2));
423 /* Left shift 1, bits 3-6 */
424 n2 = (n2 & L_SHIFT_1_MASK) << 1;
425
426 return n1 | n2;
427}
428
429/**
430 * ux500_swizzle_key() - Shuffle around words and bits in the AES key
431 * @in: key to swizzle
432 * @out: swizzled key
433 * @len: length of key, in bytes
434 *
435 * This "key swizzling procedure" is described in the examples in the
436 * DB8500 design specification. There is no real description of why
437 * the bits have been arranged like this in the hardware.
438 */
439static inline void ux500_swizzle_key(const u8 *in, u8 *out, u32 len)
440{
441 int i = 0;
442 int bpw = sizeof(u32);
443 int j;
444 int index = 0;
445
446 j = len - bpw;
447 while (j >= 0) {
448 for (i = 0; i < bpw; i++) {
449 index = len - j - bpw + i;
450 out[j + i] =
451 ux500_swap_bits_in_byte(in[index]);
452 }
453 j -= bpw;
454 }
455}
456
457static void stm32_cryp_hw_write_key(struct stm32_cryp *c)
458{
459 unsigned int i;
460 int r_id;
461
462 if (is_des(c)) {
463 stm32_cryp_write(c, c->caps->k1l, be32_to_cpu(c->ctx->key[0]));
464 stm32_cryp_write(c, c->caps->k1r, be32_to_cpu(c->ctx->key[1]));
465 return;
466 }
467
468 /*
469 * On the Ux500 the AES key is considered as a single bit sequence
470 * of 128, 192 or 256 bits length. It is written linearly into the
471 * registers from K1L and down, and need to be processed to become
472 * a proper big-endian bit sequence.
473 */
474 if (is_aes(c) && c->caps->linear_aes_key) {
475 u32 tmpkey[8];
476
477 ux500_swizzle_key((u8 *)c->ctx->key,
478 (u8 *)tmpkey, c->ctx->keylen);
479
480 r_id = c->caps->k1l;
481 for (i = 0; i < c->ctx->keylen / sizeof(u32); i++, r_id += 4)
482 stm32_cryp_write(c, r_id, tmpkey[i]);
483
484 return;
485 }
486
487 r_id = c->caps->k3r;
488 for (i = c->ctx->keylen / sizeof(u32); i > 0; i--, r_id -= 4)
489 stm32_cryp_write(c, r_id, be32_to_cpu(c->ctx->key[i - 1]));
490}
491
492static u32 stm32_cryp_get_hw_mode(struct stm32_cryp *cryp)
493{
494 if (is_aes(cryp) && is_ecb(cryp))
495 return CR_AES_ECB;
496
497 if (is_aes(cryp) && is_cbc(cryp))
498 return CR_AES_CBC;
499
500 if (is_aes(cryp) && is_ctr(cryp))
501 return CR_AES_CTR;
502
503 if (is_aes(cryp) && is_gcm(cryp))
504 return CR_AES_GCM;
505
506 if (is_aes(cryp) && is_ccm(cryp))
507 return CR_AES_CCM;
508
509 if (is_des(cryp) && is_ecb(cryp))
510 return CR_DES_ECB;
511
512 if (is_des(cryp) && is_cbc(cryp))
513 return CR_DES_CBC;
514
515 if (is_tdes(cryp) && is_ecb(cryp))
516 return CR_TDES_ECB;
517
518 if (is_tdes(cryp) && is_cbc(cryp))
519 return CR_TDES_CBC;
520
521 dev_err(cryp->dev, "Unknown mode\n");
522 return CR_AES_UNKNOWN;
523}
524
525static unsigned int stm32_cryp_get_input_text_len(struct stm32_cryp *cryp)
526{
527 return is_encrypt(cryp) ? cryp->areq->cryptlen :
528 cryp->areq->cryptlen - cryp->authsize;
529}
530
531static int stm32_cryp_gcm_init(struct stm32_cryp *cryp, u32 cfg)
532{
533 int ret;
534 __be32 iv[4];
535
536 /* Phase 1 : init */
537 memcpy(iv, cryp->areq->iv, 12);
538 iv[3] = cpu_to_be32(GCM_CTR_INIT);
539 cryp->gcm_ctr = GCM_CTR_INIT;
540 stm32_cryp_hw_write_iv(cryp, iv);
541
542 stm32_cryp_write(cryp, cryp->caps->cr, cfg | CR_PH_INIT | CR_CRYPEN);
543
544 /* Wait for end of processing */
545 ret = stm32_cryp_wait_enable(cryp);
546 if (ret) {
547 dev_err(cryp->dev, "Timeout (gcm init)\n");
548 return ret;
549 }
550
551 /* Prepare next phase */
552 if (cryp->areq->assoclen) {
553 cfg |= CR_PH_HEADER;
554 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
555 } else if (stm32_cryp_get_input_text_len(cryp)) {
556 cfg |= CR_PH_PAYLOAD;
557 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
558 }
559
560 return 0;
561}
562
563static void stm32_crypt_gcmccm_end_header(struct stm32_cryp *cryp)
564{
565 u32 cfg;
566 int err;
567
568 /* Check if whole header written */
569 if (!cryp->header_in) {
570 /* Wait for completion */
571 err = stm32_cryp_wait_busy(cryp);
572 if (err) {
573 dev_err(cryp->dev, "Timeout (gcm/ccm header)\n");
574 stm32_cryp_write(cryp, cryp->caps->imsc, 0);
575 stm32_cryp_finish_req(cryp, err);
576 return;
577 }
578
579 if (stm32_cryp_get_input_text_len(cryp)) {
580 /* Phase 3 : payload */
581 cfg = stm32_cryp_read(cryp, cryp->caps->cr);
582 cfg &= ~CR_CRYPEN;
583 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
584
585 cfg &= ~CR_PH_MASK;
586 cfg |= CR_PH_PAYLOAD | CR_CRYPEN;
587 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
588 } else {
589 /*
590 * Phase 4 : tag.
591 * Nothing to read, nothing to write, caller have to
592 * end request
593 */
594 }
595 }
596}
597
598static void stm32_cryp_write_ccm_first_header(struct stm32_cryp *cryp)
599{
600 unsigned int i;
601 size_t written;
602 size_t len;
603 u32 alen = cryp->areq->assoclen;
604 u32 block[AES_BLOCK_32] = {0};
605 u8 *b8 = (u8 *)block;
606
607 if (alen <= 65280) {
608 /* Write first u32 of B1 */
609 b8[0] = (alen >> 8) & 0xFF;
610 b8[1] = alen & 0xFF;
611 len = 2;
612 } else {
613 /* Build the two first u32 of B1 */
614 b8[0] = 0xFF;
615 b8[1] = 0xFE;
616 b8[2] = (alen & 0xFF000000) >> 24;
617 b8[3] = (alen & 0x00FF0000) >> 16;
618 b8[4] = (alen & 0x0000FF00) >> 8;
619 b8[5] = alen & 0x000000FF;
620 len = 6;
621 }
622
623 written = min_t(size_t, AES_BLOCK_SIZE - len, alen);
624
625 scatterwalk_copychunks((char *)block + len, &cryp->in_walk, written, 0);
626 for (i = 0; i < AES_BLOCK_32; i++)
627 stm32_cryp_write(cryp, cryp->caps->din, block[i]);
628
629 cryp->header_in -= written;
630
631 stm32_crypt_gcmccm_end_header(cryp);
632}
633
634static int stm32_cryp_ccm_init(struct stm32_cryp *cryp, u32 cfg)
635{
636 int ret;
637 u32 iv_32[AES_BLOCK_32], b0_32[AES_BLOCK_32];
638 u8 *iv = (u8 *)iv_32, *b0 = (u8 *)b0_32;
639 __be32 *bd;
640 u32 *d;
641 unsigned int i, textlen;
642
643 /* Phase 1 : init. Firstly set the CTR value to 1 (not 0) */
644 memcpy(iv, cryp->areq->iv, AES_BLOCK_SIZE);
645 memset(iv + AES_BLOCK_SIZE - 1 - iv[0], 0, iv[0] + 1);
646 iv[AES_BLOCK_SIZE - 1] = 1;
647 stm32_cryp_hw_write_iv(cryp, (__be32 *)iv);
648
649 /* Build B0 */
650 memcpy(b0, iv, AES_BLOCK_SIZE);
651
652 b0[0] |= (8 * ((cryp->authsize - 2) / 2));
653
654 if (cryp->areq->assoclen)
655 b0[0] |= 0x40;
656
657 textlen = stm32_cryp_get_input_text_len(cryp);
658
659 b0[AES_BLOCK_SIZE - 2] = textlen >> 8;
660 b0[AES_BLOCK_SIZE - 1] = textlen & 0xFF;
661
662 /* Enable HW */
663 stm32_cryp_write(cryp, cryp->caps->cr, cfg | CR_PH_INIT | CR_CRYPEN);
664
665 /* Write B0 */
666 d = (u32 *)b0;
667 bd = (__be32 *)b0;
668
669 for (i = 0; i < AES_BLOCK_32; i++) {
670 u32 xd = d[i];
671
672 if (!cryp->caps->padding_wa)
673 xd = be32_to_cpu(bd[i]);
674 stm32_cryp_write(cryp, cryp->caps->din, xd);
675 }
676
677 /* Wait for end of processing */
678 ret = stm32_cryp_wait_enable(cryp);
679 if (ret) {
680 dev_err(cryp->dev, "Timeout (ccm init)\n");
681 return ret;
682 }
683
684 /* Prepare next phase */
685 if (cryp->areq->assoclen) {
686 cfg |= CR_PH_HEADER | CR_CRYPEN;
687 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
688
689 /* Write first (special) block (may move to next phase [payload]) */
690 stm32_cryp_write_ccm_first_header(cryp);
691 } else if (stm32_cryp_get_input_text_len(cryp)) {
692 cfg |= CR_PH_PAYLOAD;
693 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
694 }
695
696 return 0;
697}
698
699static int stm32_cryp_hw_init(struct stm32_cryp *cryp)
700{
701 int ret;
702 u32 cfg, hw_mode;
703
704 pm_runtime_get_sync(cryp->dev);
705
706 /* Disable interrupt */
707 stm32_cryp_write(cryp, cryp->caps->imsc, 0);
708
709 /* Set configuration */
710 cfg = CR_DATA8 | CR_FFLUSH;
711
712 switch (cryp->ctx->keylen) {
713 case AES_KEYSIZE_128:
714 cfg |= CR_KEY128;
715 break;
716
717 case AES_KEYSIZE_192:
718 cfg |= CR_KEY192;
719 break;
720
721 default:
722 case AES_KEYSIZE_256:
723 cfg |= CR_KEY256;
724 break;
725 }
726
727 hw_mode = stm32_cryp_get_hw_mode(cryp);
728 if (hw_mode == CR_AES_UNKNOWN)
729 return -EINVAL;
730
731 /* AES ECB/CBC decrypt: run key preparation first */
732 if (is_decrypt(cryp) &&
733 ((hw_mode == CR_AES_ECB) || (hw_mode == CR_AES_CBC))) {
734 /* Configure in key preparation mode */
735 if (cryp->caps->kp_mode)
736 stm32_cryp_write(cryp, cryp->caps->cr,
737 cfg | CR_AES_KP);
738 else
739 stm32_cryp_write(cryp,
740 cryp->caps->cr, cfg | CR_AES_ECB | CR_KSE);
741
742 /* Set key only after full configuration done */
743 stm32_cryp_hw_write_key(cryp);
744
745 /* Start prepare key */
746 stm32_cryp_enable(cryp);
747 /* Wait for end of processing */
748 ret = stm32_cryp_wait_busy(cryp);
749 if (ret) {
750 dev_err(cryp->dev, "Timeout (key preparation)\n");
751 return ret;
752 }
753
754 cfg |= hw_mode | CR_DEC_NOT_ENC;
755
756 /* Apply updated config (Decrypt + algo) and flush */
757 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
758 } else {
759 cfg |= hw_mode;
760 if (is_decrypt(cryp))
761 cfg |= CR_DEC_NOT_ENC;
762
763 /* Apply config and flush */
764 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
765
766 /* Set key only after configuration done */
767 stm32_cryp_hw_write_key(cryp);
768 }
769
770 switch (hw_mode) {
771 case CR_AES_GCM:
772 case CR_AES_CCM:
773 /* Phase 1 : init */
774 if (hw_mode == CR_AES_CCM)
775 ret = stm32_cryp_ccm_init(cryp, cfg);
776 else
777 ret = stm32_cryp_gcm_init(cryp, cfg);
778
779 if (ret)
780 return ret;
781
782 break;
783
784 case CR_DES_CBC:
785 case CR_TDES_CBC:
786 case CR_AES_CBC:
787 case CR_AES_CTR:
788 stm32_cryp_hw_write_iv(cryp, (__be32 *)cryp->req->iv);
789 break;
790
791 default:
792 break;
793 }
794
795 /* Enable now */
796 stm32_cryp_enable(cryp);
797
798 return 0;
799}
800
801static void stm32_cryp_finish_req(struct stm32_cryp *cryp, int err)
802{
803 if (!err && (is_gcm(cryp) || is_ccm(cryp)))
804 /* Phase 4 : output tag */
805 err = stm32_cryp_read_auth_tag(cryp);
806
807 if (!err && (!(is_gcm(cryp) || is_ccm(cryp) || is_ecb(cryp))))
808 stm32_cryp_get_iv(cryp);
809
810 pm_runtime_mark_last_busy(cryp->dev);
811 pm_runtime_put_autosuspend(cryp->dev);
812
813 if (is_gcm(cryp) || is_ccm(cryp))
814 crypto_finalize_aead_request(cryp->engine, cryp->areq, err);
815 else
816 crypto_finalize_skcipher_request(cryp->engine, cryp->req,
817 err);
818}
819
820static int stm32_cryp_cpu_start(struct stm32_cryp *cryp)
821{
822 /* Enable interrupt and let the IRQ handler do everything */
823 stm32_cryp_write(cryp, cryp->caps->imsc, IMSCR_IN | IMSCR_OUT);
824
825 return 0;
826}
827
828static int stm32_cryp_cipher_one_req(struct crypto_engine *engine, void *areq);
829static int stm32_cryp_prepare_cipher_req(struct crypto_engine *engine,
830 void *areq);
831
832static int stm32_cryp_init_tfm(struct crypto_skcipher *tfm)
833{
834 struct stm32_cryp_ctx *ctx = crypto_skcipher_ctx(tfm);
835
836 crypto_skcipher_set_reqsize(tfm, sizeof(struct stm32_cryp_reqctx));
837
838 ctx->enginectx.op.do_one_request = stm32_cryp_cipher_one_req;
839 ctx->enginectx.op.prepare_request = stm32_cryp_prepare_cipher_req;
840 ctx->enginectx.op.unprepare_request = NULL;
841 return 0;
842}
843
844static int stm32_cryp_aead_one_req(struct crypto_engine *engine, void *areq);
845static int stm32_cryp_prepare_aead_req(struct crypto_engine *engine,
846 void *areq);
847
848static int stm32_cryp_aes_aead_init(struct crypto_aead *tfm)
849{
850 struct stm32_cryp_ctx *ctx = crypto_aead_ctx(tfm);
851
852 tfm->reqsize = sizeof(struct stm32_cryp_reqctx);
853
854 ctx->enginectx.op.do_one_request = stm32_cryp_aead_one_req;
855 ctx->enginectx.op.prepare_request = stm32_cryp_prepare_aead_req;
856 ctx->enginectx.op.unprepare_request = NULL;
857
858 return 0;
859}
860
861static int stm32_cryp_crypt(struct skcipher_request *req, unsigned long mode)
862{
863 struct stm32_cryp_ctx *ctx = crypto_skcipher_ctx(
864 crypto_skcipher_reqtfm(req));
865 struct stm32_cryp_reqctx *rctx = skcipher_request_ctx(req);
866 struct stm32_cryp *cryp = stm32_cryp_find_dev(ctx);
867
868 if (!cryp)
869 return -ENODEV;
870
871 rctx->mode = mode;
872
873 return crypto_transfer_skcipher_request_to_engine(cryp->engine, req);
874}
875
876static int stm32_cryp_aead_crypt(struct aead_request *req, unsigned long mode)
877{
878 struct stm32_cryp_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
879 struct stm32_cryp_reqctx *rctx = aead_request_ctx(req);
880 struct stm32_cryp *cryp = stm32_cryp_find_dev(ctx);
881
882 if (!cryp)
883 return -ENODEV;
884
885 rctx->mode = mode;
886
887 return crypto_transfer_aead_request_to_engine(cryp->engine, req);
888}
889
890static int stm32_cryp_setkey(struct crypto_skcipher *tfm, const u8 *key,
891 unsigned int keylen)
892{
893 struct stm32_cryp_ctx *ctx = crypto_skcipher_ctx(tfm);
894
895 memcpy(ctx->key, key, keylen);
896 ctx->keylen = keylen;
897
898 return 0;
899}
900
901static int stm32_cryp_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
902 unsigned int keylen)
903{
904 if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
905 keylen != AES_KEYSIZE_256)
906 return -EINVAL;
907 else
908 return stm32_cryp_setkey(tfm, key, keylen);
909}
910
911static int stm32_cryp_des_setkey(struct crypto_skcipher *tfm, const u8 *key,
912 unsigned int keylen)
913{
914 return verify_skcipher_des_key(tfm, key) ?:
915 stm32_cryp_setkey(tfm, key, keylen);
916}
917
918static int stm32_cryp_tdes_setkey(struct crypto_skcipher *tfm, const u8 *key,
919 unsigned int keylen)
920{
921 return verify_skcipher_des3_key(tfm, key) ?:
922 stm32_cryp_setkey(tfm, key, keylen);
923}
924
925static int stm32_cryp_aes_aead_setkey(struct crypto_aead *tfm, const u8 *key,
926 unsigned int keylen)
927{
928 struct stm32_cryp_ctx *ctx = crypto_aead_ctx(tfm);
929
930 if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
931 keylen != AES_KEYSIZE_256)
932 return -EINVAL;
933
934 memcpy(ctx->key, key, keylen);
935 ctx->keylen = keylen;
936
937 return 0;
938}
939
940static int stm32_cryp_aes_gcm_setauthsize(struct crypto_aead *tfm,
941 unsigned int authsize)
942{
943 switch (authsize) {
944 case 4:
945 case 8:
946 case 12:
947 case 13:
948 case 14:
949 case 15:
950 case 16:
951 break;
952 default:
953 return -EINVAL;
954 }
955
956 return 0;
957}
958
959static int stm32_cryp_aes_ccm_setauthsize(struct crypto_aead *tfm,
960 unsigned int authsize)
961{
962 switch (authsize) {
963 case 4:
964 case 6:
965 case 8:
966 case 10:
967 case 12:
968 case 14:
969 case 16:
970 break;
971 default:
972 return -EINVAL;
973 }
974
975 return 0;
976}
977
978static int stm32_cryp_aes_ecb_encrypt(struct skcipher_request *req)
979{
980 if (req->cryptlen % AES_BLOCK_SIZE)
981 return -EINVAL;
982
983 if (req->cryptlen == 0)
984 return 0;
985
986 return stm32_cryp_crypt(req, FLG_AES | FLG_ECB | FLG_ENCRYPT);
987}
988
989static int stm32_cryp_aes_ecb_decrypt(struct skcipher_request *req)
990{
991 if (req->cryptlen % AES_BLOCK_SIZE)
992 return -EINVAL;
993
994 if (req->cryptlen == 0)
995 return 0;
996
997 return stm32_cryp_crypt(req, FLG_AES | FLG_ECB);
998}
999
1000static int stm32_cryp_aes_cbc_encrypt(struct skcipher_request *req)
1001{
1002 if (req->cryptlen % AES_BLOCK_SIZE)
1003 return -EINVAL;
1004
1005 if (req->cryptlen == 0)
1006 return 0;
1007
1008 return stm32_cryp_crypt(req, FLG_AES | FLG_CBC | FLG_ENCRYPT);
1009}
1010
1011static int stm32_cryp_aes_cbc_decrypt(struct skcipher_request *req)
1012{
1013 if (req->cryptlen % AES_BLOCK_SIZE)
1014 return -EINVAL;
1015
1016 if (req->cryptlen == 0)
1017 return 0;
1018
1019 return stm32_cryp_crypt(req, FLG_AES | FLG_CBC);
1020}
1021
1022static int stm32_cryp_aes_ctr_encrypt(struct skcipher_request *req)
1023{
1024 if (req->cryptlen == 0)
1025 return 0;
1026
1027 return stm32_cryp_crypt(req, FLG_AES | FLG_CTR | FLG_ENCRYPT);
1028}
1029
1030static int stm32_cryp_aes_ctr_decrypt(struct skcipher_request *req)
1031{
1032 if (req->cryptlen == 0)
1033 return 0;
1034
1035 return stm32_cryp_crypt(req, FLG_AES | FLG_CTR);
1036}
1037
1038static int stm32_cryp_aes_gcm_encrypt(struct aead_request *req)
1039{
1040 return stm32_cryp_aead_crypt(req, FLG_AES | FLG_GCM | FLG_ENCRYPT);
1041}
1042
1043static int stm32_cryp_aes_gcm_decrypt(struct aead_request *req)
1044{
1045 return stm32_cryp_aead_crypt(req, FLG_AES | FLG_GCM);
1046}
1047
1048static inline int crypto_ccm_check_iv(const u8 *iv)
1049{
1050 /* 2 <= L <= 8, so 1 <= L' <= 7. */
1051 if (iv[0] < 1 || iv[0] > 7)
1052 return -EINVAL;
1053
1054 return 0;
1055}
1056
1057static int stm32_cryp_aes_ccm_encrypt(struct aead_request *req)
1058{
1059 int err;
1060
1061 err = crypto_ccm_check_iv(req->iv);
1062 if (err)
1063 return err;
1064
1065 return stm32_cryp_aead_crypt(req, FLG_AES | FLG_CCM | FLG_ENCRYPT);
1066}
1067
1068static int stm32_cryp_aes_ccm_decrypt(struct aead_request *req)
1069{
1070 int err;
1071
1072 err = crypto_ccm_check_iv(req->iv);
1073 if (err)
1074 return err;
1075
1076 return stm32_cryp_aead_crypt(req, FLG_AES | FLG_CCM);
1077}
1078
1079static int stm32_cryp_des_ecb_encrypt(struct skcipher_request *req)
1080{
1081 if (req->cryptlen % DES_BLOCK_SIZE)
1082 return -EINVAL;
1083
1084 if (req->cryptlen == 0)
1085 return 0;
1086
1087 return stm32_cryp_crypt(req, FLG_DES | FLG_ECB | FLG_ENCRYPT);
1088}
1089
1090static int stm32_cryp_des_ecb_decrypt(struct skcipher_request *req)
1091{
1092 if (req->cryptlen % DES_BLOCK_SIZE)
1093 return -EINVAL;
1094
1095 if (req->cryptlen == 0)
1096 return 0;
1097
1098 return stm32_cryp_crypt(req, FLG_DES | FLG_ECB);
1099}
1100
1101static int stm32_cryp_des_cbc_encrypt(struct skcipher_request *req)
1102{
1103 if (req->cryptlen % DES_BLOCK_SIZE)
1104 return -EINVAL;
1105
1106 if (req->cryptlen == 0)
1107 return 0;
1108
1109 return stm32_cryp_crypt(req, FLG_DES | FLG_CBC | FLG_ENCRYPT);
1110}
1111
1112static int stm32_cryp_des_cbc_decrypt(struct skcipher_request *req)
1113{
1114 if (req->cryptlen % DES_BLOCK_SIZE)
1115 return -EINVAL;
1116
1117 if (req->cryptlen == 0)
1118 return 0;
1119
1120 return stm32_cryp_crypt(req, FLG_DES | FLG_CBC);
1121}
1122
1123static int stm32_cryp_tdes_ecb_encrypt(struct skcipher_request *req)
1124{
1125 if (req->cryptlen % DES_BLOCK_SIZE)
1126 return -EINVAL;
1127
1128 if (req->cryptlen == 0)
1129 return 0;
1130
1131 return stm32_cryp_crypt(req, FLG_TDES | FLG_ECB | FLG_ENCRYPT);
1132}
1133
1134static int stm32_cryp_tdes_ecb_decrypt(struct skcipher_request *req)
1135{
1136 if (req->cryptlen % DES_BLOCK_SIZE)
1137 return -EINVAL;
1138
1139 if (req->cryptlen == 0)
1140 return 0;
1141
1142 return stm32_cryp_crypt(req, FLG_TDES | FLG_ECB);
1143}
1144
1145static int stm32_cryp_tdes_cbc_encrypt(struct skcipher_request *req)
1146{
1147 if (req->cryptlen % DES_BLOCK_SIZE)
1148 return -EINVAL;
1149
1150 if (req->cryptlen == 0)
1151 return 0;
1152
1153 return stm32_cryp_crypt(req, FLG_TDES | FLG_CBC | FLG_ENCRYPT);
1154}
1155
1156static int stm32_cryp_tdes_cbc_decrypt(struct skcipher_request *req)
1157{
1158 if (req->cryptlen % DES_BLOCK_SIZE)
1159 return -EINVAL;
1160
1161 if (req->cryptlen == 0)
1162 return 0;
1163
1164 return stm32_cryp_crypt(req, FLG_TDES | FLG_CBC);
1165}
1166
1167static int stm32_cryp_prepare_req(struct skcipher_request *req,
1168 struct aead_request *areq)
1169{
1170 struct stm32_cryp_ctx *ctx;
1171 struct stm32_cryp *cryp;
1172 struct stm32_cryp_reqctx *rctx;
1173 struct scatterlist *in_sg;
1174 int ret;
1175
1176 if (!req && !areq)
1177 return -EINVAL;
1178
1179 ctx = req ? crypto_skcipher_ctx(crypto_skcipher_reqtfm(req)) :
1180 crypto_aead_ctx(crypto_aead_reqtfm(areq));
1181
1182 cryp = ctx->cryp;
1183
1184 if (!cryp)
1185 return -ENODEV;
1186
1187 rctx = req ? skcipher_request_ctx(req) : aead_request_ctx(areq);
1188 rctx->mode &= FLG_MODE_MASK;
1189
1190 ctx->cryp = cryp;
1191
1192 cryp->flags = (cryp->flags & ~FLG_MODE_MASK) | rctx->mode;
1193 cryp->hw_blocksize = is_aes(cryp) ? AES_BLOCK_SIZE : DES_BLOCK_SIZE;
1194 cryp->ctx = ctx;
1195
1196 if (req) {
1197 cryp->req = req;
1198 cryp->areq = NULL;
1199 cryp->header_in = 0;
1200 cryp->payload_in = req->cryptlen;
1201 cryp->payload_out = req->cryptlen;
1202 cryp->authsize = 0;
1203 } else {
1204 /*
1205 * Length of input and output data:
1206 * Encryption case:
1207 * INPUT = AssocData || PlainText
1208 * <- assoclen -> <- cryptlen ->
1209 *
1210 * OUTPUT = AssocData || CipherText || AuthTag
1211 * <- assoclen -> <-- cryptlen --> <- authsize ->
1212 *
1213 * Decryption case:
1214 * INPUT = AssocData || CipherTex || AuthTag
1215 * <- assoclen ---> <---------- cryptlen ---------->
1216 *
1217 * OUTPUT = AssocData || PlainText
1218 * <- assoclen -> <- cryptlen - authsize ->
1219 */
1220 cryp->areq = areq;
1221 cryp->req = NULL;
1222 cryp->authsize = crypto_aead_authsize(crypto_aead_reqtfm(areq));
1223 if (is_encrypt(cryp)) {
1224 cryp->payload_in = areq->cryptlen;
1225 cryp->header_in = areq->assoclen;
1226 cryp->payload_out = areq->cryptlen;
1227 } else {
1228 cryp->payload_in = areq->cryptlen - cryp->authsize;
1229 cryp->header_in = areq->assoclen;
1230 cryp->payload_out = cryp->payload_in;
1231 }
1232 }
1233
1234 in_sg = req ? req->src : areq->src;
1235 scatterwalk_start(&cryp->in_walk, in_sg);
1236
1237 cryp->out_sg = req ? req->dst : areq->dst;
1238 scatterwalk_start(&cryp->out_walk, cryp->out_sg);
1239
1240 if (is_gcm(cryp) || is_ccm(cryp)) {
1241 /* In output, jump after assoc data */
1242 scatterwalk_copychunks(NULL, &cryp->out_walk, cryp->areq->assoclen, 2);
1243 }
1244
1245 if (is_ctr(cryp))
1246 memset(cryp->last_ctr, 0, sizeof(cryp->last_ctr));
1247
1248 ret = stm32_cryp_hw_init(cryp);
1249 return ret;
1250}
1251
1252static int stm32_cryp_prepare_cipher_req(struct crypto_engine *engine,
1253 void *areq)
1254{
1255 struct skcipher_request *req = container_of(areq,
1256 struct skcipher_request,
1257 base);
1258
1259 return stm32_cryp_prepare_req(req, NULL);
1260}
1261
1262static int stm32_cryp_cipher_one_req(struct crypto_engine *engine, void *areq)
1263{
1264 struct skcipher_request *req = container_of(areq,
1265 struct skcipher_request,
1266 base);
1267 struct stm32_cryp_ctx *ctx = crypto_skcipher_ctx(
1268 crypto_skcipher_reqtfm(req));
1269 struct stm32_cryp *cryp = ctx->cryp;
1270
1271 if (!cryp)
1272 return -ENODEV;
1273
1274 return stm32_cryp_cpu_start(cryp);
1275}
1276
1277static int stm32_cryp_prepare_aead_req(struct crypto_engine *engine, void *areq)
1278{
1279 struct aead_request *req = container_of(areq, struct aead_request,
1280 base);
1281
1282 return stm32_cryp_prepare_req(NULL, req);
1283}
1284
1285static int stm32_cryp_aead_one_req(struct crypto_engine *engine, void *areq)
1286{
1287 struct aead_request *req = container_of(areq, struct aead_request,
1288 base);
1289 struct stm32_cryp_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
1290 struct stm32_cryp *cryp = ctx->cryp;
1291
1292 if (!cryp)
1293 return -ENODEV;
1294
1295 if (unlikely(!cryp->payload_in && !cryp->header_in)) {
1296 /* No input data to process: get tag and finish */
1297 stm32_cryp_finish_req(cryp, 0);
1298 return 0;
1299 }
1300
1301 return stm32_cryp_cpu_start(cryp);
1302}
1303
1304static int stm32_cryp_read_auth_tag(struct stm32_cryp *cryp)
1305{
1306 u32 cfg, size_bit;
1307 unsigned int i;
1308 int ret = 0;
1309
1310 /* Update Config */
1311 cfg = stm32_cryp_read(cryp, cryp->caps->cr);
1312
1313 cfg &= ~CR_PH_MASK;
1314 cfg |= CR_PH_FINAL;
1315 cfg &= ~CR_DEC_NOT_ENC;
1316 cfg |= CR_CRYPEN;
1317
1318 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
1319
1320 if (is_gcm(cryp)) {
1321 /* GCM: write aad and payload size (in bits) */
1322 size_bit = cryp->areq->assoclen * 8;
1323 if (cryp->caps->swap_final)
1324 size_bit = (__force u32)cpu_to_be32(size_bit);
1325
1326 stm32_cryp_write(cryp, cryp->caps->din, 0);
1327 stm32_cryp_write(cryp, cryp->caps->din, size_bit);
1328
1329 size_bit = is_encrypt(cryp) ? cryp->areq->cryptlen :
1330 cryp->areq->cryptlen - cryp->authsize;
1331 size_bit *= 8;
1332 if (cryp->caps->swap_final)
1333 size_bit = (__force u32)cpu_to_be32(size_bit);
1334
1335 stm32_cryp_write(cryp, cryp->caps->din, 0);
1336 stm32_cryp_write(cryp, cryp->caps->din, size_bit);
1337 } else {
1338 /* CCM: write CTR0 */
1339 u32 iv32[AES_BLOCK_32];
1340 u8 *iv = (u8 *)iv32;
1341 __be32 *biv = (__be32 *)iv32;
1342
1343 memcpy(iv, cryp->areq->iv, AES_BLOCK_SIZE);
1344 memset(iv + AES_BLOCK_SIZE - 1 - iv[0], 0, iv[0] + 1);
1345
1346 for (i = 0; i < AES_BLOCK_32; i++) {
1347 u32 xiv = iv32[i];
1348
1349 if (!cryp->caps->padding_wa)
1350 xiv = be32_to_cpu(biv[i]);
1351 stm32_cryp_write(cryp, cryp->caps->din, xiv);
1352 }
1353 }
1354
1355 /* Wait for output data */
1356 ret = stm32_cryp_wait_output(cryp);
1357 if (ret) {
1358 dev_err(cryp->dev, "Timeout (read tag)\n");
1359 return ret;
1360 }
1361
1362 if (is_encrypt(cryp)) {
1363 u32 out_tag[AES_BLOCK_32];
1364
1365 /* Get and write tag */
1366 for (i = 0; i < AES_BLOCK_32; i++)
1367 out_tag[i] = stm32_cryp_read(cryp, cryp->caps->dout);
1368
1369 scatterwalk_copychunks(out_tag, &cryp->out_walk, cryp->authsize, 1);
1370 } else {
1371 /* Get and check tag */
1372 u32 in_tag[AES_BLOCK_32], out_tag[AES_BLOCK_32];
1373
1374 scatterwalk_copychunks(in_tag, &cryp->in_walk, cryp->authsize, 0);
1375
1376 for (i = 0; i < AES_BLOCK_32; i++)
1377 out_tag[i] = stm32_cryp_read(cryp, cryp->caps->dout);
1378
1379 if (crypto_memneq(in_tag, out_tag, cryp->authsize))
1380 ret = -EBADMSG;
1381 }
1382
1383 /* Disable cryp */
1384 cfg &= ~CR_CRYPEN;
1385 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
1386
1387 return ret;
1388}
1389
1390static void stm32_cryp_check_ctr_counter(struct stm32_cryp *cryp)
1391{
1392 u32 cr;
1393
1394 if (unlikely(cryp->last_ctr[3] == cpu_to_be32(0xFFFFFFFF))) {
1395 /*
1396 * In this case, we need to increment manually the ctr counter,
1397 * as HW doesn't handle the U32 carry.
1398 */
1399 crypto_inc((u8 *)cryp->last_ctr, sizeof(cryp->last_ctr));
1400
1401 cr = stm32_cryp_read(cryp, cryp->caps->cr);
1402 stm32_cryp_write(cryp, cryp->caps->cr, cr & ~CR_CRYPEN);
1403
1404 stm32_cryp_hw_write_iv(cryp, cryp->last_ctr);
1405
1406 stm32_cryp_write(cryp, cryp->caps->cr, cr);
1407 }
1408
1409 /* The IV registers are BE */
1410 cryp->last_ctr[0] = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv0l));
1411 cryp->last_ctr[1] = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv0r));
1412 cryp->last_ctr[2] = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv1l));
1413 cryp->last_ctr[3] = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv1r));
1414}
1415
1416static void stm32_cryp_irq_read_data(struct stm32_cryp *cryp)
1417{
1418 unsigned int i;
1419 u32 block[AES_BLOCK_32];
1420
1421 for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++)
1422 block[i] = stm32_cryp_read(cryp, cryp->caps->dout);
1423
1424 scatterwalk_copychunks(block, &cryp->out_walk, min_t(size_t, cryp->hw_blocksize,
1425 cryp->payload_out), 1);
1426 cryp->payload_out -= min_t(size_t, cryp->hw_blocksize,
1427 cryp->payload_out);
1428}
1429
1430static void stm32_cryp_irq_write_block(struct stm32_cryp *cryp)
1431{
1432 unsigned int i;
1433 u32 block[AES_BLOCK_32] = {0};
1434
1435 scatterwalk_copychunks(block, &cryp->in_walk, min_t(size_t, cryp->hw_blocksize,
1436 cryp->payload_in), 0);
1437 for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++)
1438 stm32_cryp_write(cryp, cryp->caps->din, block[i]);
1439
1440 cryp->payload_in -= min_t(size_t, cryp->hw_blocksize, cryp->payload_in);
1441}
1442
1443static void stm32_cryp_irq_write_gcm_padded_data(struct stm32_cryp *cryp)
1444{
1445 int err;
1446 u32 cfg, block[AES_BLOCK_32] = {0};
1447 unsigned int i;
1448
1449 /* 'Special workaround' procedure described in the datasheet */
1450
1451 /* a) disable ip */
1452 stm32_cryp_write(cryp, cryp->caps->imsc, 0);
1453 cfg = stm32_cryp_read(cryp, cryp->caps->cr);
1454 cfg &= ~CR_CRYPEN;
1455 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
1456
1457 /* b) Update IV1R */
1458 stm32_cryp_write(cryp, cryp->caps->iv1r, cryp->gcm_ctr - 2);
1459
1460 /* c) change mode to CTR */
1461 cfg &= ~CR_ALGO_MASK;
1462 cfg |= CR_AES_CTR;
1463 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
1464
1465 /* a) enable IP */
1466 cfg |= CR_CRYPEN;
1467 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
1468
1469 /* b) pad and write the last block */
1470 stm32_cryp_irq_write_block(cryp);
1471 /* wait end of process */
1472 err = stm32_cryp_wait_output(cryp);
1473 if (err) {
1474 dev_err(cryp->dev, "Timeout (write gcm last data)\n");
1475 return stm32_cryp_finish_req(cryp, err);
1476 }
1477
1478 /* c) get and store encrypted data */
1479 /*
1480 * Same code as stm32_cryp_irq_read_data(), but we want to store
1481 * block value
1482 */
1483 for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++)
1484 block[i] = stm32_cryp_read(cryp, cryp->caps->dout);
1485
1486 scatterwalk_copychunks(block, &cryp->out_walk, min_t(size_t, cryp->hw_blocksize,
1487 cryp->payload_out), 1);
1488 cryp->payload_out -= min_t(size_t, cryp->hw_blocksize,
1489 cryp->payload_out);
1490
1491 /* d) change mode back to AES GCM */
1492 cfg &= ~CR_ALGO_MASK;
1493 cfg |= CR_AES_GCM;
1494 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
1495
1496 /* e) change phase to Final */
1497 cfg &= ~CR_PH_MASK;
1498 cfg |= CR_PH_FINAL;
1499 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
1500
1501 /* f) write padded data */
1502 for (i = 0; i < AES_BLOCK_32; i++)
1503 stm32_cryp_write(cryp, cryp->caps->din, block[i]);
1504
1505 /* g) Empty fifo out */
1506 err = stm32_cryp_wait_output(cryp);
1507 if (err) {
1508 dev_err(cryp->dev, "Timeout (write gcm padded data)\n");
1509 return stm32_cryp_finish_req(cryp, err);
1510 }
1511
1512 for (i = 0; i < AES_BLOCK_32; i++)
1513 stm32_cryp_read(cryp, cryp->caps->dout);
1514
1515 /* h) run the he normal Final phase */
1516 stm32_cryp_finish_req(cryp, 0);
1517}
1518
1519static void stm32_cryp_irq_set_npblb(struct stm32_cryp *cryp)
1520{
1521 u32 cfg;
1522
1523 /* disable ip, set NPBLB and reneable ip */
1524 cfg = stm32_cryp_read(cryp, cryp->caps->cr);
1525 cfg &= ~CR_CRYPEN;
1526 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
1527
1528 cfg |= (cryp->hw_blocksize - cryp->payload_in) << CR_NBPBL_SHIFT;
1529 cfg |= CR_CRYPEN;
1530 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
1531}
1532
1533static void stm32_cryp_irq_write_ccm_padded_data(struct stm32_cryp *cryp)
1534{
1535 int err = 0;
1536 u32 cfg, iv1tmp;
1537 u32 cstmp1[AES_BLOCK_32], cstmp2[AES_BLOCK_32];
1538 u32 block[AES_BLOCK_32] = {0};
1539 unsigned int i;
1540
1541 /* 'Special workaround' procedure described in the datasheet */
1542
1543 /* a) disable ip */
1544 stm32_cryp_write(cryp, cryp->caps->imsc, 0);
1545
1546 cfg = stm32_cryp_read(cryp, cryp->caps->cr);
1547 cfg &= ~CR_CRYPEN;
1548 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
1549
1550 /* b) get IV1 from CRYP_CSGCMCCM7 */
1551 iv1tmp = stm32_cryp_read(cryp, CRYP_CSGCMCCM0R + 7 * 4);
1552
1553 /* c) Load CRYP_CSGCMCCMxR */
1554 for (i = 0; i < ARRAY_SIZE(cstmp1); i++)
1555 cstmp1[i] = stm32_cryp_read(cryp, CRYP_CSGCMCCM0R + i * 4);
1556
1557 /* d) Write IV1R */
1558 stm32_cryp_write(cryp, cryp->caps->iv1r, iv1tmp);
1559
1560 /* e) change mode to CTR */
1561 cfg &= ~CR_ALGO_MASK;
1562 cfg |= CR_AES_CTR;
1563 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
1564
1565 /* a) enable IP */
1566 cfg |= CR_CRYPEN;
1567 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
1568
1569 /* b) pad and write the last block */
1570 stm32_cryp_irq_write_block(cryp);
1571 /* wait end of process */
1572 err = stm32_cryp_wait_output(cryp);
1573 if (err) {
1574 dev_err(cryp->dev, "Timeout (write ccm padded data)\n");
1575 return stm32_cryp_finish_req(cryp, err);
1576 }
1577
1578 /* c) get and store decrypted data */
1579 /*
1580 * Same code as stm32_cryp_irq_read_data(), but we want to store
1581 * block value
1582 */
1583 for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++)
1584 block[i] = stm32_cryp_read(cryp, cryp->caps->dout);
1585
1586 scatterwalk_copychunks(block, &cryp->out_walk, min_t(size_t, cryp->hw_blocksize,
1587 cryp->payload_out), 1);
1588 cryp->payload_out -= min_t(size_t, cryp->hw_blocksize, cryp->payload_out);
1589
1590 /* d) Load again CRYP_CSGCMCCMxR */
1591 for (i = 0; i < ARRAY_SIZE(cstmp2); i++)
1592 cstmp2[i] = stm32_cryp_read(cryp, CRYP_CSGCMCCM0R + i * 4);
1593
1594 /* e) change mode back to AES CCM */
1595 cfg &= ~CR_ALGO_MASK;
1596 cfg |= CR_AES_CCM;
1597 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
1598
1599 /* f) change phase to header */
1600 cfg &= ~CR_PH_MASK;
1601 cfg |= CR_PH_HEADER;
1602 stm32_cryp_write(cryp, cryp->caps->cr, cfg);
1603
1604 /* g) XOR and write padded data */
1605 for (i = 0; i < ARRAY_SIZE(block); i++) {
1606 block[i] ^= cstmp1[i];
1607 block[i] ^= cstmp2[i];
1608 stm32_cryp_write(cryp, cryp->caps->din, block[i]);
1609 }
1610
1611 /* h) wait for completion */
1612 err = stm32_cryp_wait_busy(cryp);
1613 if (err)
1614 dev_err(cryp->dev, "Timeout (write ccm padded data)\n");
1615
1616 /* i) run the he normal Final phase */
1617 stm32_cryp_finish_req(cryp, err);
1618}
1619
1620static void stm32_cryp_irq_write_data(struct stm32_cryp *cryp)
1621{
1622 if (unlikely(!cryp->payload_in)) {
1623 dev_warn(cryp->dev, "No more data to process\n");
1624 return;
1625 }
1626
1627 if (unlikely(cryp->payload_in < AES_BLOCK_SIZE &&
1628 (stm32_cryp_get_hw_mode(cryp) == CR_AES_GCM) &&
1629 is_encrypt(cryp))) {
1630 /* Padding for AES GCM encryption */
1631 if (cryp->caps->padding_wa) {
1632 /* Special case 1 */
1633 stm32_cryp_irq_write_gcm_padded_data(cryp);
1634 return;
1635 }
1636
1637 /* Setting padding bytes (NBBLB) */
1638 stm32_cryp_irq_set_npblb(cryp);
1639 }
1640
1641 if (unlikely((cryp->payload_in < AES_BLOCK_SIZE) &&
1642 (stm32_cryp_get_hw_mode(cryp) == CR_AES_CCM) &&
1643 is_decrypt(cryp))) {
1644 /* Padding for AES CCM decryption */
1645 if (cryp->caps->padding_wa) {
1646 /* Special case 2 */
1647 stm32_cryp_irq_write_ccm_padded_data(cryp);
1648 return;
1649 }
1650
1651 /* Setting padding bytes (NBBLB) */
1652 stm32_cryp_irq_set_npblb(cryp);
1653 }
1654
1655 if (is_aes(cryp) && is_ctr(cryp))
1656 stm32_cryp_check_ctr_counter(cryp);
1657
1658 stm32_cryp_irq_write_block(cryp);
1659}
1660
1661static void stm32_cryp_irq_write_gcmccm_header(struct stm32_cryp *cryp)
1662{
1663 unsigned int i;
1664 u32 block[AES_BLOCK_32] = {0};
1665 size_t written;
1666
1667 written = min_t(size_t, AES_BLOCK_SIZE, cryp->header_in);
1668
1669 scatterwalk_copychunks(block, &cryp->in_walk, written, 0);
1670 for (i = 0; i < AES_BLOCK_32; i++)
1671 stm32_cryp_write(cryp, cryp->caps->din, block[i]);
1672
1673 cryp->header_in -= written;
1674
1675 stm32_crypt_gcmccm_end_header(cryp);
1676}
1677
1678static irqreturn_t stm32_cryp_irq_thread(int irq, void *arg)
1679{
1680 struct stm32_cryp *cryp = arg;
1681 u32 ph;
1682 u32 it_mask = stm32_cryp_read(cryp, cryp->caps->imsc);
1683
1684 if (cryp->irq_status & MISR_OUT)
1685 /* Output FIFO IRQ: read data */
1686 stm32_cryp_irq_read_data(cryp);
1687
1688 if (cryp->irq_status & MISR_IN) {
1689 if (is_gcm(cryp) || is_ccm(cryp)) {
1690 ph = stm32_cryp_read(cryp, cryp->caps->cr) & CR_PH_MASK;
1691 if (unlikely(ph == CR_PH_HEADER))
1692 /* Write Header */
1693 stm32_cryp_irq_write_gcmccm_header(cryp);
1694 else
1695 /* Input FIFO IRQ: write data */
1696 stm32_cryp_irq_write_data(cryp);
1697 if (is_gcm(cryp))
1698 cryp->gcm_ctr++;
1699 } else {
1700 /* Input FIFO IRQ: write data */
1701 stm32_cryp_irq_write_data(cryp);
1702 }
1703 }
1704
1705 /* Mask useless interrupts */
1706 if (!cryp->payload_in && !cryp->header_in)
1707 it_mask &= ~IMSCR_IN;
1708 if (!cryp->payload_out)
1709 it_mask &= ~IMSCR_OUT;
1710 stm32_cryp_write(cryp, cryp->caps->imsc, it_mask);
1711
1712 if (!cryp->payload_in && !cryp->header_in && !cryp->payload_out)
1713 stm32_cryp_finish_req(cryp, 0);
1714
1715 return IRQ_HANDLED;
1716}
1717
1718static irqreturn_t stm32_cryp_irq(int irq, void *arg)
1719{
1720 struct stm32_cryp *cryp = arg;
1721
1722 cryp->irq_status = stm32_cryp_read(cryp, cryp->caps->mis);
1723
1724 return IRQ_WAKE_THREAD;
1725}
1726
1727static struct skcipher_alg crypto_algs[] = {
1728{
1729 .base.cra_name = "ecb(aes)",
1730 .base.cra_driver_name = "stm32-ecb-aes",
1731 .base.cra_priority = 200,
1732 .base.cra_flags = CRYPTO_ALG_ASYNC,
1733 .base.cra_blocksize = AES_BLOCK_SIZE,
1734 .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
1735 .base.cra_alignmask = 0,
1736 .base.cra_module = THIS_MODULE,
1737
1738 .init = stm32_cryp_init_tfm,
1739 .min_keysize = AES_MIN_KEY_SIZE,
1740 .max_keysize = AES_MAX_KEY_SIZE,
1741 .setkey = stm32_cryp_aes_setkey,
1742 .encrypt = stm32_cryp_aes_ecb_encrypt,
1743 .decrypt = stm32_cryp_aes_ecb_decrypt,
1744},
1745{
1746 .base.cra_name = "cbc(aes)",
1747 .base.cra_driver_name = "stm32-cbc-aes",
1748 .base.cra_priority = 200,
1749 .base.cra_flags = CRYPTO_ALG_ASYNC,
1750 .base.cra_blocksize = AES_BLOCK_SIZE,
1751 .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
1752 .base.cra_alignmask = 0,
1753 .base.cra_module = THIS_MODULE,
1754
1755 .init = stm32_cryp_init_tfm,
1756 .min_keysize = AES_MIN_KEY_SIZE,
1757 .max_keysize = AES_MAX_KEY_SIZE,
1758 .ivsize = AES_BLOCK_SIZE,
1759 .setkey = stm32_cryp_aes_setkey,
1760 .encrypt = stm32_cryp_aes_cbc_encrypt,
1761 .decrypt = stm32_cryp_aes_cbc_decrypt,
1762},
1763{
1764 .base.cra_name = "ctr(aes)",
1765 .base.cra_driver_name = "stm32-ctr-aes",
1766 .base.cra_priority = 200,
1767 .base.cra_flags = CRYPTO_ALG_ASYNC,
1768 .base.cra_blocksize = 1,
1769 .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
1770 .base.cra_alignmask = 0,
1771 .base.cra_module = THIS_MODULE,
1772
1773 .init = stm32_cryp_init_tfm,
1774 .min_keysize = AES_MIN_KEY_SIZE,
1775 .max_keysize = AES_MAX_KEY_SIZE,
1776 .ivsize = AES_BLOCK_SIZE,
1777 .setkey = stm32_cryp_aes_setkey,
1778 .encrypt = stm32_cryp_aes_ctr_encrypt,
1779 .decrypt = stm32_cryp_aes_ctr_decrypt,
1780},
1781{
1782 .base.cra_name = "ecb(des)",
1783 .base.cra_driver_name = "stm32-ecb-des",
1784 .base.cra_priority = 200,
1785 .base.cra_flags = CRYPTO_ALG_ASYNC,
1786 .base.cra_blocksize = DES_BLOCK_SIZE,
1787 .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
1788 .base.cra_alignmask = 0,
1789 .base.cra_module = THIS_MODULE,
1790
1791 .init = stm32_cryp_init_tfm,
1792 .min_keysize = DES_BLOCK_SIZE,
1793 .max_keysize = DES_BLOCK_SIZE,
1794 .setkey = stm32_cryp_des_setkey,
1795 .encrypt = stm32_cryp_des_ecb_encrypt,
1796 .decrypt = stm32_cryp_des_ecb_decrypt,
1797},
1798{
1799 .base.cra_name = "cbc(des)",
1800 .base.cra_driver_name = "stm32-cbc-des",
1801 .base.cra_priority = 200,
1802 .base.cra_flags = CRYPTO_ALG_ASYNC,
1803 .base.cra_blocksize = DES_BLOCK_SIZE,
1804 .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
1805 .base.cra_alignmask = 0,
1806 .base.cra_module = THIS_MODULE,
1807
1808 .init = stm32_cryp_init_tfm,
1809 .min_keysize = DES_BLOCK_SIZE,
1810 .max_keysize = DES_BLOCK_SIZE,
1811 .ivsize = DES_BLOCK_SIZE,
1812 .setkey = stm32_cryp_des_setkey,
1813 .encrypt = stm32_cryp_des_cbc_encrypt,
1814 .decrypt = stm32_cryp_des_cbc_decrypt,
1815},
1816{
1817 .base.cra_name = "ecb(des3_ede)",
1818 .base.cra_driver_name = "stm32-ecb-des3",
1819 .base.cra_priority = 200,
1820 .base.cra_flags = CRYPTO_ALG_ASYNC,
1821 .base.cra_blocksize = DES_BLOCK_SIZE,
1822 .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
1823 .base.cra_alignmask = 0,
1824 .base.cra_module = THIS_MODULE,
1825
1826 .init = stm32_cryp_init_tfm,
1827 .min_keysize = 3 * DES_BLOCK_SIZE,
1828 .max_keysize = 3 * DES_BLOCK_SIZE,
1829 .setkey = stm32_cryp_tdes_setkey,
1830 .encrypt = stm32_cryp_tdes_ecb_encrypt,
1831 .decrypt = stm32_cryp_tdes_ecb_decrypt,
1832},
1833{
1834 .base.cra_name = "cbc(des3_ede)",
1835 .base.cra_driver_name = "stm32-cbc-des3",
1836 .base.cra_priority = 200,
1837 .base.cra_flags = CRYPTO_ALG_ASYNC,
1838 .base.cra_blocksize = DES_BLOCK_SIZE,
1839 .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
1840 .base.cra_alignmask = 0,
1841 .base.cra_module = THIS_MODULE,
1842
1843 .init = stm32_cryp_init_tfm,
1844 .min_keysize = 3 * DES_BLOCK_SIZE,
1845 .max_keysize = 3 * DES_BLOCK_SIZE,
1846 .ivsize = DES_BLOCK_SIZE,
1847 .setkey = stm32_cryp_tdes_setkey,
1848 .encrypt = stm32_cryp_tdes_cbc_encrypt,
1849 .decrypt = stm32_cryp_tdes_cbc_decrypt,
1850},
1851};
1852
1853static struct aead_alg aead_algs[] = {
1854{
1855 .setkey = stm32_cryp_aes_aead_setkey,
1856 .setauthsize = stm32_cryp_aes_gcm_setauthsize,
1857 .encrypt = stm32_cryp_aes_gcm_encrypt,
1858 .decrypt = stm32_cryp_aes_gcm_decrypt,
1859 .init = stm32_cryp_aes_aead_init,
1860 .ivsize = 12,
1861 .maxauthsize = AES_BLOCK_SIZE,
1862
1863 .base = {
1864 .cra_name = "gcm(aes)",
1865 .cra_driver_name = "stm32-gcm-aes",
1866 .cra_priority = 200,
1867 .cra_flags = CRYPTO_ALG_ASYNC,
1868 .cra_blocksize = 1,
1869 .cra_ctxsize = sizeof(struct stm32_cryp_ctx),
1870 .cra_alignmask = 0,
1871 .cra_module = THIS_MODULE,
1872 },
1873},
1874{
1875 .setkey = stm32_cryp_aes_aead_setkey,
1876 .setauthsize = stm32_cryp_aes_ccm_setauthsize,
1877 .encrypt = stm32_cryp_aes_ccm_encrypt,
1878 .decrypt = stm32_cryp_aes_ccm_decrypt,
1879 .init = stm32_cryp_aes_aead_init,
1880 .ivsize = AES_BLOCK_SIZE,
1881 .maxauthsize = AES_BLOCK_SIZE,
1882
1883 .base = {
1884 .cra_name = "ccm(aes)",
1885 .cra_driver_name = "stm32-ccm-aes",
1886 .cra_priority = 200,
1887 .cra_flags = CRYPTO_ALG_ASYNC,
1888 .cra_blocksize = 1,
1889 .cra_ctxsize = sizeof(struct stm32_cryp_ctx),
1890 .cra_alignmask = 0,
1891 .cra_module = THIS_MODULE,
1892 },
1893},
1894};
1895
1896static const struct stm32_cryp_caps ux500_data = {
1897 .aeads_support = false,
1898 .linear_aes_key = true,
1899 .kp_mode = false,
1900 .iv_protection = true,
1901 .swap_final = true,
1902 .padding_wa = true,
1903 .cr = UX500_CRYP_CR,
1904 .sr = UX500_CRYP_SR,
1905 .din = UX500_CRYP_DIN,
1906 .dout = UX500_CRYP_DOUT,
1907 .imsc = UX500_CRYP_IMSC,
1908 .mis = UX500_CRYP_MIS,
1909 .k1l = UX500_CRYP_K1L,
1910 .k1r = UX500_CRYP_K1R,
1911 .k3r = UX500_CRYP_K3R,
1912 .iv0l = UX500_CRYP_IV0L,
1913 .iv0r = UX500_CRYP_IV0R,
1914 .iv1l = UX500_CRYP_IV1L,
1915 .iv1r = UX500_CRYP_IV1R,
1916};
1917
1918static const struct stm32_cryp_caps f7_data = {
1919 .aeads_support = true,
1920 .linear_aes_key = false,
1921 .kp_mode = true,
1922 .iv_protection = false,
1923 .swap_final = true,
1924 .padding_wa = true,
1925 .cr = CRYP_CR,
1926 .sr = CRYP_SR,
1927 .din = CRYP_DIN,
1928 .dout = CRYP_DOUT,
1929 .imsc = CRYP_IMSCR,
1930 .mis = CRYP_MISR,
1931 .k1l = CRYP_K1LR,
1932 .k1r = CRYP_K1RR,
1933 .k3r = CRYP_K3RR,
1934 .iv0l = CRYP_IV0LR,
1935 .iv0r = CRYP_IV0RR,
1936 .iv1l = CRYP_IV1LR,
1937 .iv1r = CRYP_IV1RR,
1938};
1939
1940static const struct stm32_cryp_caps mp1_data = {
1941 .aeads_support = true,
1942 .linear_aes_key = false,
1943 .kp_mode = true,
1944 .iv_protection = false,
1945 .swap_final = false,
1946 .padding_wa = false,
1947 .cr = CRYP_CR,
1948 .sr = CRYP_SR,
1949 .din = CRYP_DIN,
1950 .dout = CRYP_DOUT,
1951 .imsc = CRYP_IMSCR,
1952 .mis = CRYP_MISR,
1953 .k1l = CRYP_K1LR,
1954 .k1r = CRYP_K1RR,
1955 .k3r = CRYP_K3RR,
1956 .iv0l = CRYP_IV0LR,
1957 .iv0r = CRYP_IV0RR,
1958 .iv1l = CRYP_IV1LR,
1959 .iv1r = CRYP_IV1RR,
1960};
1961
1962static const struct of_device_id stm32_dt_ids[] = {
1963 { .compatible = "stericsson,ux500-cryp", .data = &ux500_data},
1964 { .compatible = "st,stm32f756-cryp", .data = &f7_data},
1965 { .compatible = "st,stm32mp1-cryp", .data = &mp1_data},
1966 {},
1967};
1968MODULE_DEVICE_TABLE(of, stm32_dt_ids);
1969
1970static int stm32_cryp_probe(struct platform_device *pdev)
1971{
1972 struct device *dev = &pdev->dev;
1973 struct stm32_cryp *cryp;
1974 struct reset_control *rst;
1975 int irq, ret;
1976
1977 cryp = devm_kzalloc(dev, sizeof(*cryp), GFP_KERNEL);
1978 if (!cryp)
1979 return -ENOMEM;
1980
1981 cryp->caps = of_device_get_match_data(dev);
1982 if (!cryp->caps)
1983 return -ENODEV;
1984
1985 cryp->dev = dev;
1986
1987 cryp->regs = devm_platform_ioremap_resource(pdev, 0);
1988 if (IS_ERR(cryp->regs))
1989 return PTR_ERR(cryp->regs);
1990
1991 irq = platform_get_irq(pdev, 0);
1992 if (irq < 0)
1993 return irq;
1994
1995 ret = devm_request_threaded_irq(dev, irq, stm32_cryp_irq,
1996 stm32_cryp_irq_thread, IRQF_ONESHOT,
1997 dev_name(dev), cryp);
1998 if (ret) {
1999 dev_err(dev, "Cannot grab IRQ\n");
2000 return ret;
2001 }
2002
2003 cryp->clk = devm_clk_get(dev, NULL);
2004 if (IS_ERR(cryp->clk)) {
2005 dev_err_probe(dev, PTR_ERR(cryp->clk), "Could not get clock\n");
2006
2007 return PTR_ERR(cryp->clk);
2008 }
2009
2010 ret = clk_prepare_enable(cryp->clk);
2011 if (ret) {
2012 dev_err(cryp->dev, "Failed to enable clock\n");
2013 return ret;
2014 }
2015
2016 pm_runtime_set_autosuspend_delay(dev, CRYP_AUTOSUSPEND_DELAY);
2017 pm_runtime_use_autosuspend(dev);
2018
2019 pm_runtime_get_noresume(dev);
2020 pm_runtime_set_active(dev);
2021 pm_runtime_enable(dev);
2022
2023 rst = devm_reset_control_get(dev, NULL);
2024 if (IS_ERR(rst)) {
2025 ret = PTR_ERR(rst);
2026 if (ret == -EPROBE_DEFER)
2027 goto err_rst;
2028 } else {
2029 reset_control_assert(rst);
2030 udelay(2);
2031 reset_control_deassert(rst);
2032 }
2033
2034 platform_set_drvdata(pdev, cryp);
2035
2036 spin_lock(&cryp_list.lock);
2037 list_add(&cryp->list, &cryp_list.dev_list);
2038 spin_unlock(&cryp_list.lock);
2039
2040 /* Initialize crypto engine */
2041 cryp->engine = crypto_engine_alloc_init(dev, 1);
2042 if (!cryp->engine) {
2043 dev_err(dev, "Could not init crypto engine\n");
2044 ret = -ENOMEM;
2045 goto err_engine1;
2046 }
2047
2048 ret = crypto_engine_start(cryp->engine);
2049 if (ret) {
2050 dev_err(dev, "Could not start crypto engine\n");
2051 goto err_engine2;
2052 }
2053
2054 ret = crypto_register_skciphers(crypto_algs, ARRAY_SIZE(crypto_algs));
2055 if (ret) {
2056 dev_err(dev, "Could not register algs\n");
2057 goto err_algs;
2058 }
2059
2060 if (cryp->caps->aeads_support) {
2061 ret = crypto_register_aeads(aead_algs, ARRAY_SIZE(aead_algs));
2062 if (ret)
2063 goto err_aead_algs;
2064 }
2065
2066 dev_info(dev, "Initialized\n");
2067
2068 pm_runtime_put_sync(dev);
2069
2070 return 0;
2071
2072err_aead_algs:
2073 crypto_unregister_skciphers(crypto_algs, ARRAY_SIZE(crypto_algs));
2074err_algs:
2075err_engine2:
2076 crypto_engine_exit(cryp->engine);
2077err_engine1:
2078 spin_lock(&cryp_list.lock);
2079 list_del(&cryp->list);
2080 spin_unlock(&cryp_list.lock);
2081err_rst:
2082 pm_runtime_disable(dev);
2083 pm_runtime_put_noidle(dev);
2084
2085 clk_disable_unprepare(cryp->clk);
2086
2087 return ret;
2088}
2089
2090static int stm32_cryp_remove(struct platform_device *pdev)
2091{
2092 struct stm32_cryp *cryp = platform_get_drvdata(pdev);
2093 int ret;
2094
2095 if (!cryp)
2096 return -ENODEV;
2097
2098 ret = pm_runtime_resume_and_get(cryp->dev);
2099 if (ret < 0)
2100 return ret;
2101
2102 if (cryp->caps->aeads_support)
2103 crypto_unregister_aeads(aead_algs, ARRAY_SIZE(aead_algs));
2104 crypto_unregister_skciphers(crypto_algs, ARRAY_SIZE(crypto_algs));
2105
2106 crypto_engine_exit(cryp->engine);
2107
2108 spin_lock(&cryp_list.lock);
2109 list_del(&cryp->list);
2110 spin_unlock(&cryp_list.lock);
2111
2112 pm_runtime_disable(cryp->dev);
2113 pm_runtime_put_noidle(cryp->dev);
2114
2115 clk_disable_unprepare(cryp->clk);
2116
2117 return 0;
2118}
2119
2120#ifdef CONFIG_PM
2121static int stm32_cryp_runtime_suspend(struct device *dev)
2122{
2123 struct stm32_cryp *cryp = dev_get_drvdata(dev);
2124
2125 clk_disable_unprepare(cryp->clk);
2126
2127 return 0;
2128}
2129
2130static int stm32_cryp_runtime_resume(struct device *dev)
2131{
2132 struct stm32_cryp *cryp = dev_get_drvdata(dev);
2133 int ret;
2134
2135 ret = clk_prepare_enable(cryp->clk);
2136 if (ret) {
2137 dev_err(cryp->dev, "Failed to prepare_enable clock\n");
2138 return ret;
2139 }
2140
2141 return 0;
2142}
2143#endif
2144
2145static const struct dev_pm_ops stm32_cryp_pm_ops = {
2146 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
2147 pm_runtime_force_resume)
2148 SET_RUNTIME_PM_OPS(stm32_cryp_runtime_suspend,
2149 stm32_cryp_runtime_resume, NULL)
2150};
2151
2152static struct platform_driver stm32_cryp_driver = {
2153 .probe = stm32_cryp_probe,
2154 .remove = stm32_cryp_remove,
2155 .driver = {
2156 .name = DRIVER_NAME,
2157 .pm = &stm32_cryp_pm_ops,
2158 .of_match_table = stm32_dt_ids,
2159 },
2160};
2161
2162module_platform_driver(stm32_cryp_driver);
2163
2164MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
2165MODULE_DESCRIPTION("STMicrolectronics STM32 CRYP hardware driver");
2166MODULE_LICENSE("GPL");