?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 4.1.16
[linux/fpc-iii.git] / drivers / crypto / s5p-sss.c
blobf214a875582731cd2850b162b5ba96e161c6b4b6
1 /*
2 * Cryptographic API.
3 *
4 * Support for Samsung S5PV210 HW acceleration.
5 *
6 * Copyright (C) 2011 NetUP Inc. All rights reserved.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as published
10 * by the Free Software Foundation.
11 *
12 */
13
14 #include <linux/delay.h>
15 #include <linux/err.h>
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/errno.h>
19 #include <linux/kernel.h>
20 #include <linux/clk.h>
21 #include <linux/platform_device.h>
22 #include <linux/scatterlist.h>
23 #include <linux/dma-mapping.h>
24 #include <linux/io.h>
25 #include <linux/of.h>
26 #include <linux/crypto.h>
27 #include <linux/interrupt.h>
28
29 #include <crypto/algapi.h>
30 #include <crypto/aes.h>
31 #include <crypto/ctr.h>
32
33 #define _SBF(s, v) ((v) << (s))
34 #define _BIT(b) _SBF(b, 1)
35
36 /* Feed control registers */
37 #define SSS_REG_FCINTSTAT 0x0000
38 #define SSS_FCINTSTAT_BRDMAINT _BIT(3)
39 #define SSS_FCINTSTAT_BTDMAINT _BIT(2)
40 #define SSS_FCINTSTAT_HRDMAINT _BIT(1)
41 #define SSS_FCINTSTAT_PKDMAINT _BIT(0)
42
43 #define SSS_REG_FCINTENSET 0x0004
44 #define SSS_FCINTENSET_BRDMAINTENSET _BIT(3)
45 #define SSS_FCINTENSET_BTDMAINTENSET _BIT(2)
46 #define SSS_FCINTENSET_HRDMAINTENSET _BIT(1)
47 #define SSS_FCINTENSET_PKDMAINTENSET _BIT(0)
48
49 #define SSS_REG_FCINTENCLR 0x0008
50 #define SSS_FCINTENCLR_BRDMAINTENCLR _BIT(3)
51 #define SSS_FCINTENCLR_BTDMAINTENCLR _BIT(2)
52 #define SSS_FCINTENCLR_HRDMAINTENCLR _BIT(1)
53 #define SSS_FCINTENCLR_PKDMAINTENCLR _BIT(0)
54
55 #define SSS_REG_FCINTPEND 0x000C
56 #define SSS_FCINTPEND_BRDMAINTP _BIT(3)
57 #define SSS_FCINTPEND_BTDMAINTP _BIT(2)
58 #define SSS_FCINTPEND_HRDMAINTP _BIT(1)
59 #define SSS_FCINTPEND_PKDMAINTP _BIT(0)
60
61 #define SSS_REG_FCFIFOSTAT 0x0010
62 #define SSS_FCFIFOSTAT_BRFIFOFUL _BIT(7)
63 #define SSS_FCFIFOSTAT_BRFIFOEMP _BIT(6)
64 #define SSS_FCFIFOSTAT_BTFIFOFUL _BIT(5)
65 #define SSS_FCFIFOSTAT_BTFIFOEMP _BIT(4)
66 #define SSS_FCFIFOSTAT_HRFIFOFUL _BIT(3)
67 #define SSS_FCFIFOSTAT_HRFIFOEMP _BIT(2)
68 #define SSS_FCFIFOSTAT_PKFIFOFUL _BIT(1)
69 #define SSS_FCFIFOSTAT_PKFIFOEMP _BIT(0)
70
71 #define SSS_REG_FCFIFOCTRL 0x0014
72 #define SSS_FCFIFOCTRL_DESSEL _BIT(2)
73 #define SSS_HASHIN_INDEPENDENT _SBF(0, 0x00)
74 #define SSS_HASHIN_CIPHER_INPUT _SBF(0, 0x01)
75 #define SSS_HASHIN_CIPHER_OUTPUT _SBF(0, 0x02)
76
77 #define SSS_REG_FCBRDMAS 0x0020
78 #define SSS_REG_FCBRDMAL 0x0024
79 #define SSS_REG_FCBRDMAC 0x0028
80 #define SSS_FCBRDMAC_BYTESWAP _BIT(1)
81 #define SSS_FCBRDMAC_FLUSH _BIT(0)
82
83 #define SSS_REG_FCBTDMAS 0x0030
84 #define SSS_REG_FCBTDMAL 0x0034
85 #define SSS_REG_FCBTDMAC 0x0038
86 #define SSS_FCBTDMAC_BYTESWAP _BIT(1)
87 #define SSS_FCBTDMAC_FLUSH _BIT(0)
88
89 #define SSS_REG_FCHRDMAS 0x0040
90 #define SSS_REG_FCHRDMAL 0x0044
91 #define SSS_REG_FCHRDMAC 0x0048
92 #define SSS_FCHRDMAC_BYTESWAP _BIT(1)
93 #define SSS_FCHRDMAC_FLUSH _BIT(0)
94
95 #define SSS_REG_FCPKDMAS 0x0050
96 #define SSS_REG_FCPKDMAL 0x0054
97 #define SSS_REG_FCPKDMAC 0x0058
98 #define SSS_FCPKDMAC_BYTESWAP _BIT(3)
99 #define SSS_FCPKDMAC_DESCEND _BIT(2)
100 #define SSS_FCPKDMAC_TRANSMIT _BIT(1)
101 #define SSS_FCPKDMAC_FLUSH _BIT(0)
102
103 #define SSS_REG_FCPKDMAO 0x005C
104
105 /* AES registers */
106 #define SSS_REG_AES_CONTROL 0x00
107 #define SSS_AES_BYTESWAP_DI _BIT(11)
108 #define SSS_AES_BYTESWAP_DO _BIT(10)
109 #define SSS_AES_BYTESWAP_IV _BIT(9)
110 #define SSS_AES_BYTESWAP_CNT _BIT(8)
111 #define SSS_AES_BYTESWAP_KEY _BIT(7)
112 #define SSS_AES_KEY_CHANGE_MODE _BIT(6)
113 #define SSS_AES_KEY_SIZE_128 _SBF(4, 0x00)
114 #define SSS_AES_KEY_SIZE_192 _SBF(4, 0x01)
115 #define SSS_AES_KEY_SIZE_256 _SBF(4, 0x02)
116 #define SSS_AES_FIFO_MODE _BIT(3)
117 #define SSS_AES_CHAIN_MODE_ECB _SBF(1, 0x00)
118 #define SSS_AES_CHAIN_MODE_CBC _SBF(1, 0x01)
119 #define SSS_AES_CHAIN_MODE_CTR _SBF(1, 0x02)
120 #define SSS_AES_MODE_DECRYPT _BIT(0)
121
122 #define SSS_REG_AES_STATUS 0x04
123 #define SSS_AES_BUSY _BIT(2)
124 #define SSS_AES_INPUT_READY _BIT(1)
125 #define SSS_AES_OUTPUT_READY _BIT(0)
126
127 #define SSS_REG_AES_IN_DATA(s) (0x10 + (s << 2))
128 #define SSS_REG_AES_OUT_DATA(s) (0x20 + (s << 2))
129 #define SSS_REG_AES_IV_DATA(s) (0x30 + (s << 2))
130 #define SSS_REG_AES_CNT_DATA(s) (0x40 + (s << 2))
131 #define SSS_REG_AES_KEY_DATA(s) (0x80 + (s << 2))
132
133 #define SSS_REG(dev, reg) ((dev)->ioaddr + (SSS_REG_##reg))
134 #define SSS_READ(dev, reg) __raw_readl(SSS_REG(dev, reg))
135 #define SSS_WRITE(dev, reg, val) __raw_writel((val), SSS_REG(dev, reg))
136
137 #define SSS_AES_REG(dev, reg) ((dev)->aes_ioaddr + SSS_REG_##reg)
138 #define SSS_AES_WRITE(dev, reg, val) __raw_writel((val), \
139 SSS_AES_REG(dev, reg))
140
141 /* HW engine modes */
142 #define FLAGS_AES_DECRYPT _BIT(0)
143 #define FLAGS_AES_MODE_MASK _SBF(1, 0x03)
144 #define FLAGS_AES_CBC _SBF(1, 0x01)
145 #define FLAGS_AES_CTR _SBF(1, 0x02)
146
147 #define AES_KEY_LEN 16
148 #define CRYPTO_QUEUE_LEN 1
149
150 /**
151 * struct samsung_aes_variant - platform specific SSS driver data
152 * @has_hash_irq: true if SSS module uses hash interrupt, false otherwise
153 * @aes_offset: AES register offset from SSS module's base.
154 *
155 * Specifies platform specific configuration of SSS module.
156 * Note: A structure for driver specific platform data is used for future
157 * expansion of its usage.
158 */
159 struct samsung_aes_variant {
160 bool has_hash_irq;
161 unsigned int aes_offset;
162 };
163
164 struct s5p_aes_reqctx {
165 unsigned long mode;
166 };
167
168 struct s5p_aes_ctx {
169 struct s5p_aes_dev *dev;
170
171 uint8_t aes_key[AES_MAX_KEY_SIZE];
172 uint8_t nonce[CTR_RFC3686_NONCE_SIZE];
173 int keylen;
174 };
175
176 struct s5p_aes_dev {
177 struct device *dev;
178 struct clk *clk;
179 void __iomem *ioaddr;
180 void __iomem *aes_ioaddr;
181 int irq_hash;
182 int irq_fc;
183
184 struct ablkcipher_request *req;
185 struct s5p_aes_ctx *ctx;
186 struct scatterlist *sg_src;
187 struct scatterlist *sg_dst;
188
189 struct tasklet_struct tasklet;
190 struct crypto_queue queue;
191 bool busy;
192 spinlock_t lock;
193
194 struct samsung_aes_variant *variant;
195 };
196
197 static struct s5p_aes_dev *s5p_dev;
198
199 static const struct samsung_aes_variant s5p_aes_data = {
200 .has_hash_irq = true,
201 .aes_offset = 0x4000,
202 };
203
204 static const struct samsung_aes_variant exynos_aes_data = {
205 .has_hash_irq = false,
206 .aes_offset = 0x200,
207 };
208
209 static const struct of_device_id s5p_sss_dt_match[] = {
210 {
211 .compatible = "samsung,s5pv210-secss",
212 .data = &s5p_aes_data,
213 },
214 {
215 .compatible = "samsung,exynos4210-secss",
216 .data = &exynos_aes_data,
217 },
218 { },
219 };
220 MODULE_DEVICE_TABLE(of, s5p_sss_dt_match);
221
222 static inline struct samsung_aes_variant *find_s5p_sss_version
223 (struct platform_device *pdev)
224 {
225 if (IS_ENABLED(CONFIG_OF) && (pdev->dev.of_node)) {
226 const struct of_device_id *match;
227 match = of_match_node(s5p_sss_dt_match,
228 pdev->dev.of_node);
229 return (struct samsung_aes_variant *)match->data;
230 }
231 return (struct samsung_aes_variant *)
232 platform_get_device_id(pdev)->driver_data;
233 }
234
235 static void s5p_set_dma_indata(struct s5p_aes_dev *dev, struct scatterlist *sg)
236 {
237 SSS_WRITE(dev, FCBRDMAS, sg_dma_address(sg));
238 SSS_WRITE(dev, FCBRDMAL, sg_dma_len(sg));
239 }
240
241 static void s5p_set_dma_outdata(struct s5p_aes_dev *dev, struct scatterlist *sg)
242 {
243 SSS_WRITE(dev, FCBTDMAS, sg_dma_address(sg));
244 SSS_WRITE(dev, FCBTDMAL, sg_dma_len(sg));
245 }
246
247 static void s5p_aes_complete(struct s5p_aes_dev *dev, int err)
248 {
249 /* holding a lock outside */
250 dev->req->base.complete(&dev->req->base, err);
251 dev->busy = false;
252 }
253
254 static void s5p_unset_outdata(struct s5p_aes_dev *dev)
255 {
256 dma_unmap_sg(dev->dev, dev->sg_dst, 1, DMA_FROM_DEVICE);
257 }
258
259 static void s5p_unset_indata(struct s5p_aes_dev *dev)
260 {
261 dma_unmap_sg(dev->dev, dev->sg_src, 1, DMA_TO_DEVICE);
262 }
263
264 static int s5p_set_outdata(struct s5p_aes_dev *dev, struct scatterlist *sg)
265 {
266 int err;
267
268 if (!IS_ALIGNED(sg_dma_len(sg), AES_BLOCK_SIZE)) {
269 err = -EINVAL;
270 goto exit;
271 }
272 if (!sg_dma_len(sg)) {
273 err = -EINVAL;
274 goto exit;
275 }
276
277 err = dma_map_sg(dev->dev, sg, 1, DMA_FROM_DEVICE);
278 if (!err) {
279 err = -ENOMEM;
280 goto exit;
281 }
282
283 dev->sg_dst = sg;
284 err = 0;
285
286 exit:
287 return err;
288 }
289
290 static int s5p_set_indata(struct s5p_aes_dev *dev, struct scatterlist *sg)
291 {
292 int err;
293
294 if (!IS_ALIGNED(sg_dma_len(sg), AES_BLOCK_SIZE)) {
295 err = -EINVAL;
296 goto exit;
297 }
298 if (!sg_dma_len(sg)) {
299 err = -EINVAL;
300 goto exit;
301 }
302
303 err = dma_map_sg(dev->dev, sg, 1, DMA_TO_DEVICE);
304 if (!err) {
305 err = -ENOMEM;
306 goto exit;
307 }
308
309 dev->sg_src = sg;
310 err = 0;
311
312 exit:
313 return err;
314 }
315
316 static void s5p_aes_tx(struct s5p_aes_dev *dev)
317 {
318 int err = 0;
319
320 s5p_unset_outdata(dev);
321
322 if (!sg_is_last(dev->sg_dst)) {
323 err = s5p_set_outdata(dev, sg_next(dev->sg_dst));
324 if (err) {
325 s5p_aes_complete(dev, err);
326 return;
327 }
328
329 s5p_set_dma_outdata(dev, dev->sg_dst);
330 } else {
331 s5p_aes_complete(dev, err);
332
333 dev->busy = true;
334 tasklet_schedule(&dev->tasklet);
335 }
336 }
337
338 static void s5p_aes_rx(struct s5p_aes_dev *dev)
339 {
340 int err;
341
342 s5p_unset_indata(dev);
343
344 if (!sg_is_last(dev->sg_src)) {
345 err = s5p_set_indata(dev, sg_next(dev->sg_src));
346 if (err) {
347 s5p_aes_complete(dev, err);
348 return;
349 }
350
351 s5p_set_dma_indata(dev, dev->sg_src);
352 }
353 }
354
355 static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
356 {
357 struct platform_device *pdev = dev_id;
358 struct s5p_aes_dev *dev = platform_get_drvdata(pdev);
359 uint32_t status;
360 unsigned long flags;
361
362 spin_lock_irqsave(&dev->lock, flags);
363
364 if (irq == dev->irq_fc) {
365 status = SSS_READ(dev, FCINTSTAT);
366 if (status & SSS_FCINTSTAT_BRDMAINT)
367 s5p_aes_rx(dev);
368 if (status & SSS_FCINTSTAT_BTDMAINT)
369 s5p_aes_tx(dev);
370
371 SSS_WRITE(dev, FCINTPEND, status);
372 }
373
374 spin_unlock_irqrestore(&dev->lock, flags);
375
376 return IRQ_HANDLED;
377 }
378
379 static void s5p_set_aes(struct s5p_aes_dev *dev,
380 uint8_t *key, uint8_t *iv, unsigned int keylen)
381 {
382 void __iomem *keystart;
383
384 if (iv)
385 memcpy(dev->aes_ioaddr + SSS_REG_AES_IV_DATA(0), iv, 0x10);
386
387 if (keylen == AES_KEYSIZE_256)
388 keystart = dev->aes_ioaddr + SSS_REG_AES_KEY_DATA(0);
389 else if (keylen == AES_KEYSIZE_192)
390 keystart = dev->aes_ioaddr + SSS_REG_AES_KEY_DATA(2);
391 else
392 keystart = dev->aes_ioaddr + SSS_REG_AES_KEY_DATA(4);
393
394 memcpy(keystart, key, keylen);
395 }
396
397 static void s5p_aes_crypt_start(struct s5p_aes_dev *dev, unsigned long mode)
398 {
399 struct ablkcipher_request *req = dev->req;
400
401 uint32_t aes_control;
402 int err;
403 unsigned long flags;
404
405 aes_control = SSS_AES_KEY_CHANGE_MODE;
406 if (mode & FLAGS_AES_DECRYPT)
407 aes_control |= SSS_AES_MODE_DECRYPT;
408
409 if ((mode & FLAGS_AES_MODE_MASK) == FLAGS_AES_CBC)
410 aes_control |= SSS_AES_CHAIN_MODE_CBC;
411 else if ((mode & FLAGS_AES_MODE_MASK) == FLAGS_AES_CTR)
412 aes_control |= SSS_AES_CHAIN_MODE_CTR;
413
414 if (dev->ctx->keylen == AES_KEYSIZE_192)
415 aes_control |= SSS_AES_KEY_SIZE_192;
416 else if (dev->ctx->keylen == AES_KEYSIZE_256)
417 aes_control |= SSS_AES_KEY_SIZE_256;
418
419 aes_control |= SSS_AES_FIFO_MODE;
420
421 /* as a variant it is possible to use byte swapping on DMA side */
422 aes_control |= SSS_AES_BYTESWAP_DI
423 | SSS_AES_BYTESWAP_DO
424 | SSS_AES_BYTESWAP_IV
425 | SSS_AES_BYTESWAP_KEY
426 | SSS_AES_BYTESWAP_CNT;
427
428 spin_lock_irqsave(&dev->lock, flags);
429
430 SSS_WRITE(dev, FCINTENCLR,
431 SSS_FCINTENCLR_BTDMAINTENCLR | SSS_FCINTENCLR_BRDMAINTENCLR);
432 SSS_WRITE(dev, FCFIFOCTRL, 0x00);
433
434 err = s5p_set_indata(dev, req->src);
435 if (err)
436 goto indata_error;
437
438 err = s5p_set_outdata(dev, req->dst);
439 if (err)
440 goto outdata_error;
441
442 SSS_AES_WRITE(dev, AES_CONTROL, aes_control);
443 s5p_set_aes(dev, dev->ctx->aes_key, req->info, dev->ctx->keylen);
444
445 s5p_set_dma_indata(dev, req->src);
446 s5p_set_dma_outdata(dev, req->dst);
447
448 SSS_WRITE(dev, FCINTENSET,
449 SSS_FCINTENSET_BTDMAINTENSET | SSS_FCINTENSET_BRDMAINTENSET);
450
451 spin_unlock_irqrestore(&dev->lock, flags);
452
453 return;
454
455 outdata_error:
456 s5p_unset_indata(dev);
457
458 indata_error:
459 s5p_aes_complete(dev, err);
460 spin_unlock_irqrestore(&dev->lock, flags);
461 }
462
463 static void s5p_tasklet_cb(unsigned long data)
464 {
465 struct s5p_aes_dev *dev = (struct s5p_aes_dev *)data;
466 struct crypto_async_request *async_req, *backlog;
467 struct s5p_aes_reqctx *reqctx;
468 unsigned long flags;
469
470 spin_lock_irqsave(&dev->lock, flags);
471 backlog = crypto_get_backlog(&dev->queue);
472 async_req = crypto_dequeue_request(&dev->queue);
473
474 if (!async_req) {
475 dev->busy = false;
476 spin_unlock_irqrestore(&dev->lock, flags);
477 return;
478 }
479 spin_unlock_irqrestore(&dev->lock, flags);
480
481 if (backlog)
482 backlog->complete(backlog, -EINPROGRESS);
483
484 dev->req = ablkcipher_request_cast(async_req);
485 dev->ctx = crypto_tfm_ctx(dev->req->base.tfm);
486 reqctx = ablkcipher_request_ctx(dev->req);
487
488 s5p_aes_crypt_start(dev, reqctx->mode);
489 }
490
491 static int s5p_aes_handle_req(struct s5p_aes_dev *dev,
492 struct ablkcipher_request *req)
493 {
494 unsigned long flags;
495 int err;
496
497 spin_lock_irqsave(&dev->lock, flags);
498 err = ablkcipher_enqueue_request(&dev->queue, req);
499 if (dev->busy) {
500 spin_unlock_irqrestore(&dev->lock, flags);
501 goto exit;
502 }
503 dev->busy = true;
504
505 spin_unlock_irqrestore(&dev->lock, flags);
506
507 tasklet_schedule(&dev->tasklet);
508
509 exit:
510 return err;
511 }
512
513 static int s5p_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
514 {
515 struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
516 struct s5p_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
517 struct s5p_aes_reqctx *reqctx = ablkcipher_request_ctx(req);
518 struct s5p_aes_dev *dev = ctx->dev;
519
520 if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE)) {
521 pr_err("request size is not exact amount of AES blocks\n");
522 return -EINVAL;
523 }
524
525 reqctx->mode = mode;
526
527 return s5p_aes_handle_req(dev, req);
528 }
529
530 static int s5p_aes_setkey(struct crypto_ablkcipher *cipher,
531 const uint8_t *key, unsigned int keylen)
532 {
533 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
534 struct s5p_aes_ctx *ctx = crypto_tfm_ctx(tfm);
535
536 if (keylen != AES_KEYSIZE_128 &&
537 keylen != AES_KEYSIZE_192 &&
538 keylen != AES_KEYSIZE_256)
539 return -EINVAL;
540
541 memcpy(ctx->aes_key, key, keylen);
542 ctx->keylen = keylen;
543
544 return 0;
545 }
546
547 static int s5p_aes_ecb_encrypt(struct ablkcipher_request *req)
548 {
549 return s5p_aes_crypt(req, 0);
550 }
551
552 static int s5p_aes_ecb_decrypt(struct ablkcipher_request *req)
553 {
554 return s5p_aes_crypt(req, FLAGS_AES_DECRYPT);
555 }
556
557 static int s5p_aes_cbc_encrypt(struct ablkcipher_request *req)
558 {
559 return s5p_aes_crypt(req, FLAGS_AES_CBC);
560 }
561
562 static int s5p_aes_cbc_decrypt(struct ablkcipher_request *req)
563 {
564 return s5p_aes_crypt(req, FLAGS_AES_DECRYPT | FLAGS_AES_CBC);
565 }
566
567 static int s5p_aes_cra_init(struct crypto_tfm *tfm)
568 {
569 struct s5p_aes_ctx *ctx = crypto_tfm_ctx(tfm);
570
571 ctx->dev = s5p_dev;
572 tfm->crt_ablkcipher.reqsize = sizeof(struct s5p_aes_reqctx);
573
574 return 0;
575 }
576
577 static struct crypto_alg algs[] = {
578 {
579 .cra_name = "ecb(aes)",
580 .cra_driver_name = "ecb-aes-s5p",
581 .cra_priority = 100,
582 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
583 CRYPTO_ALG_ASYNC |
584 CRYPTO_ALG_KERN_DRIVER_ONLY,
585 .cra_blocksize = AES_BLOCK_SIZE,
586 .cra_ctxsize = sizeof(struct s5p_aes_ctx),
587 .cra_alignmask = 0x0f,
588 .cra_type = &crypto_ablkcipher_type,
589 .cra_module = THIS_MODULE,
590 .cra_init = s5p_aes_cra_init,
591 .cra_u.ablkcipher = {
592 .min_keysize = AES_MIN_KEY_SIZE,
593 .max_keysize = AES_MAX_KEY_SIZE,
594 .setkey = s5p_aes_setkey,
595 .encrypt = s5p_aes_ecb_encrypt,
596 .decrypt = s5p_aes_ecb_decrypt,
597 }
598 },
599 {
600 .cra_name = "cbc(aes)",
601 .cra_driver_name = "cbc-aes-s5p",
602 .cra_priority = 100,
603 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
604 CRYPTO_ALG_ASYNC |
605 CRYPTO_ALG_KERN_DRIVER_ONLY,
606 .cra_blocksize = AES_BLOCK_SIZE,
607 .cra_ctxsize = sizeof(struct s5p_aes_ctx),
608 .cra_alignmask = 0x0f,
609 .cra_type = &crypto_ablkcipher_type,
610 .cra_module = THIS_MODULE,
611 .cra_init = s5p_aes_cra_init,
612 .cra_u.ablkcipher = {
613 .min_keysize = AES_MIN_KEY_SIZE,
614 .max_keysize = AES_MAX_KEY_SIZE,
615 .ivsize = AES_BLOCK_SIZE,
616 .setkey = s5p_aes_setkey,
617 .encrypt = s5p_aes_cbc_encrypt,
618 .decrypt = s5p_aes_cbc_decrypt,
619 }
620 },
621 };
622
623 static int s5p_aes_probe(struct platform_device *pdev)
624 {
625 int i, j, err = -ENODEV;
626 struct s5p_aes_dev *pdata;
627 struct device *dev = &pdev->dev;
628 struct resource *res;
629 struct samsung_aes_variant *variant;
630
631 if (s5p_dev)
632 return -EEXIST;
633
634 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
635 if (!pdata)
636 return -ENOMEM;
637
638 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
639 pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
640 if (IS_ERR(pdata->ioaddr))
641 return PTR_ERR(pdata->ioaddr);
642
643 variant = find_s5p_sss_version(pdev);
644
645 pdata->clk = devm_clk_get(dev, "secss");
646 if (IS_ERR(pdata->clk)) {
647 dev_err(dev, "failed to find secss clock source\n");
648 return -ENOENT;
649 }
650
651 err = clk_prepare_enable(pdata->clk);
652 if (err < 0) {
653 dev_err(dev, "Enabling SSS clk failed, err %d\n", err);
654 return err;
655 }
656
657 spin_lock_init(&pdata->lock);
658
659 pdata->aes_ioaddr = pdata->ioaddr + variant->aes_offset;
660
661 pdata->irq_fc = platform_get_irq(pdev, 0);
662 if (pdata->irq_fc < 0) {
663 err = pdata->irq_fc;
664 dev_warn(dev, "feed control interrupt is not available.\n");
665 goto err_irq;
666 }
667 err = devm_request_irq(dev, pdata->irq_fc, s5p_aes_interrupt,
668 IRQF_SHARED, pdev->name, pdev);
669 if (err < 0) {
670 dev_warn(dev, "feed control interrupt is not available.\n");
671 goto err_irq;
672 }
673
674 if (variant->has_hash_irq) {
675 pdata->irq_hash = platform_get_irq(pdev, 1);
676 if (pdata->irq_hash < 0) {
677 err = pdata->irq_hash;
678 dev_warn(dev, "hash interrupt is not available.\n");
679 goto err_irq;
680 }
681 err = devm_request_irq(dev, pdata->irq_hash, s5p_aes_interrupt,
682 IRQF_SHARED, pdev->name, pdev);
683 if (err < 0) {
684 dev_warn(dev, "hash interrupt is not available.\n");
685 goto err_irq;
686 }
687 }
688
689 pdata->busy = false;
690 pdata->variant = variant;
691 pdata->dev = dev;
692 platform_set_drvdata(pdev, pdata);
693 s5p_dev = pdata;
694
695 tasklet_init(&pdata->tasklet, s5p_tasklet_cb, (unsigned long)pdata);
696 crypto_init_queue(&pdata->queue, CRYPTO_QUEUE_LEN);
697
698 for (i = 0; i < ARRAY_SIZE(algs); i++) {
699 err = crypto_register_alg(&algs[i]);
700 if (err)
701 goto err_algs;
702 }
703
704 pr_info("s5p-sss driver registered\n");
705
706 return 0;
707
708 err_algs:
709 dev_err(dev, "can't register '%s': %d\n", algs[i].cra_name, err);
710
711 for (j = 0; j < i; j++)
712 crypto_unregister_alg(&algs[j]);
713
714 tasklet_kill(&pdata->tasklet);
715
716 err_irq:
717 clk_disable_unprepare(pdata->clk);
718
719 s5p_dev = NULL;
720
721 return err;
722 }
723
724 static int s5p_aes_remove(struct platform_device *pdev)
725 {
726 struct s5p_aes_dev *pdata = platform_get_drvdata(pdev);
727 int i;
728
729 if (!pdata)
730 return -ENODEV;
731
732 for (i = 0; i < ARRAY_SIZE(algs); i++)
733 crypto_unregister_alg(&algs[i]);
734
735 tasklet_kill(&pdata->tasklet);
736
737 clk_disable_unprepare(pdata->clk);
738
739 s5p_dev = NULL;
740
741 return 0;
742 }
743
744 static struct platform_driver s5p_aes_crypto = {
745 .probe = s5p_aes_probe,
746 .remove = s5p_aes_remove,
747 .driver = {
748 .name = "s5p-secss",
749 .of_match_table = s5p_sss_dt_match,
750 },
751 };
752
753 module_platform_driver(s5p_aes_crypto);
754
755 MODULE_DESCRIPTION("S5PV210 AES hw acceleration support.");
756 MODULE_LICENSE("GPL v2");
757 MODULE_AUTHOR("Vladimir Zapolskiy <vzapolskiy@gmail.com>");
Linux with added FPC-III support