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hwmon: (adt7475) fan stall prevention
[linux/fpc-iii.git] / drivers / crypto / sahara.c
blob1d9ecd368b5bb966b80a725514fe5ae4fcc92e59
1 /*
2 * Cryptographic API.
3 *
4 * Support for SAHARA cryptographic accelerator.
5 *
6 * Copyright (c) 2014 Steffen Trumtrar <s.trumtrar@pengutronix.de>
7 * Copyright (c) 2013 Vista Silicon S.L.
8 * Author: Javier Martin <javier.martin@vista-silicon.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as published
12 * by the Free Software Foundation.
13 *
14 * Based on omap-aes.c and tegra-aes.c
15 */
16
17 #include <crypto/aes.h>
18 #include <crypto/internal/hash.h>
19 #include <crypto/internal/skcipher.h>
20 #include <crypto/scatterwalk.h>
21 #include <crypto/sha.h>
22
23 #include <linux/clk.h>
24 #include <linux/crypto.h>
25 #include <linux/interrupt.h>
26 #include <linux/io.h>
27 #include <linux/irq.h>
28 #include <linux/kernel.h>
29 #include <linux/kthread.h>
30 #include <linux/module.h>
31 #include <linux/mutex.h>
32 #include <linux/of.h>
33 #include <linux/of_device.h>
34 #include <linux/platform_device.h>
35
36 #define SHA_BUFFER_LEN PAGE_SIZE
37 #define SAHARA_MAX_SHA_BLOCK_SIZE SHA256_BLOCK_SIZE
38
39 #define SAHARA_NAME "sahara"
40 #define SAHARA_VERSION_3 3
41 #define SAHARA_VERSION_4 4
42 #define SAHARA_TIMEOUT_MS 1000
43 #define SAHARA_MAX_HW_DESC 2
44 #define SAHARA_MAX_HW_LINK 20
45
46 #define FLAGS_MODE_MASK 0x000f
47 #define FLAGS_ENCRYPT BIT(0)
48 #define FLAGS_CBC BIT(1)
49 #define FLAGS_NEW_KEY BIT(3)
50
51 #define SAHARA_HDR_BASE 0x00800000
52 #define SAHARA_HDR_SKHA_ALG_AES 0
53 #define SAHARA_HDR_SKHA_OP_ENC (1 << 2)
54 #define SAHARA_HDR_SKHA_MODE_ECB (0 << 3)
55 #define SAHARA_HDR_SKHA_MODE_CBC (1 << 3)
56 #define SAHARA_HDR_FORM_DATA (5 << 16)
57 #define SAHARA_HDR_FORM_KEY (8 << 16)
58 #define SAHARA_HDR_LLO (1 << 24)
59 #define SAHARA_HDR_CHA_SKHA (1 << 28)
60 #define SAHARA_HDR_CHA_MDHA (2 << 28)
61 #define SAHARA_HDR_PARITY_BIT (1 << 31)
62
63 #define SAHARA_HDR_MDHA_SET_MODE_MD_KEY 0x20880000
64 #define SAHARA_HDR_MDHA_SET_MODE_HASH 0x208D0000
65 #define SAHARA_HDR_MDHA_HASH 0xA0850000
66 #define SAHARA_HDR_MDHA_STORE_DIGEST 0x20820000
67 #define SAHARA_HDR_MDHA_ALG_SHA1 0
68 #define SAHARA_HDR_MDHA_ALG_MD5 1
69 #define SAHARA_HDR_MDHA_ALG_SHA256 2
70 #define SAHARA_HDR_MDHA_ALG_SHA224 3
71 #define SAHARA_HDR_MDHA_PDATA (1 << 2)
72 #define SAHARA_HDR_MDHA_HMAC (1 << 3)
73 #define SAHARA_HDR_MDHA_INIT (1 << 5)
74 #define SAHARA_HDR_MDHA_IPAD (1 << 6)
75 #define SAHARA_HDR_MDHA_OPAD (1 << 7)
76 #define SAHARA_HDR_MDHA_SWAP (1 << 8)
77 #define SAHARA_HDR_MDHA_MAC_FULL (1 << 9)
78 #define SAHARA_HDR_MDHA_SSL (1 << 10)
79
80 /* SAHARA can only process one request at a time */
81 #define SAHARA_QUEUE_LENGTH 1
82
83 #define SAHARA_REG_VERSION 0x00
84 #define SAHARA_REG_DAR 0x04
85 #define SAHARA_REG_CONTROL 0x08
86 #define SAHARA_CONTROL_SET_THROTTLE(x) (((x) & 0xff) << 24)
87 #define SAHARA_CONTROL_SET_MAXBURST(x) (((x) & 0xff) << 16)
88 #define SAHARA_CONTROL_RNG_AUTORSD (1 << 7)
89 #define SAHARA_CONTROL_ENABLE_INT (1 << 4)
90 #define SAHARA_REG_CMD 0x0C
91 #define SAHARA_CMD_RESET (1 << 0)
92 #define SAHARA_CMD_CLEAR_INT (1 << 8)
93 #define SAHARA_CMD_CLEAR_ERR (1 << 9)
94 #define SAHARA_CMD_SINGLE_STEP (1 << 10)
95 #define SAHARA_CMD_MODE_BATCH (1 << 16)
96 #define SAHARA_CMD_MODE_DEBUG (1 << 18)
97 #define SAHARA_REG_STATUS 0x10
98 #define SAHARA_STATUS_GET_STATE(x) ((x) & 0x7)
99 #define SAHARA_STATE_IDLE 0
100 #define SAHARA_STATE_BUSY 1
101 #define SAHARA_STATE_ERR 2
102 #define SAHARA_STATE_FAULT 3
103 #define SAHARA_STATE_COMPLETE 4
104 #define SAHARA_STATE_COMP_FLAG (1 << 2)
105 #define SAHARA_STATUS_DAR_FULL (1 << 3)
106 #define SAHARA_STATUS_ERROR (1 << 4)
107 #define SAHARA_STATUS_SECURE (1 << 5)
108 #define SAHARA_STATUS_FAIL (1 << 6)
109 #define SAHARA_STATUS_INIT (1 << 7)
110 #define SAHARA_STATUS_RNG_RESEED (1 << 8)
111 #define SAHARA_STATUS_ACTIVE_RNG (1 << 9)
112 #define SAHARA_STATUS_ACTIVE_MDHA (1 << 10)
113 #define SAHARA_STATUS_ACTIVE_SKHA (1 << 11)
114 #define SAHARA_STATUS_MODE_BATCH (1 << 16)
115 #define SAHARA_STATUS_MODE_DEDICATED (1 << 17)
116 #define SAHARA_STATUS_MODE_DEBUG (1 << 18)
117 #define SAHARA_STATUS_GET_ISTATE(x) (((x) >> 24) & 0xff)
118 #define SAHARA_REG_ERRSTATUS 0x14
119 #define SAHARA_ERRSTATUS_GET_SOURCE(x) ((x) & 0xf)
120 #define SAHARA_ERRSOURCE_CHA 14
121 #define SAHARA_ERRSOURCE_DMA 15
122 #define SAHARA_ERRSTATUS_DMA_DIR (1 << 8)
123 #define SAHARA_ERRSTATUS_GET_DMASZ(x)(((x) >> 9) & 0x3)
124 #define SAHARA_ERRSTATUS_GET_DMASRC(x) (((x) >> 13) & 0x7)
125 #define SAHARA_ERRSTATUS_GET_CHASRC(x) (((x) >> 16) & 0xfff)
126 #define SAHARA_ERRSTATUS_GET_CHAERR(x) (((x) >> 28) & 0x3)
127 #define SAHARA_REG_FADDR 0x18
128 #define SAHARA_REG_CDAR 0x1C
129 #define SAHARA_REG_IDAR 0x20
130
131 struct sahara_hw_desc {
132 u32 hdr;
133 u32 len1;
134 u32 p1;
135 u32 len2;
136 u32 p2;
137 u32 next;
138 };
139
140 struct sahara_hw_link {
141 u32 len;
142 u32 p;
143 u32 next;
144 };
145
146 struct sahara_ctx {
147 unsigned long flags;
148
149 /* AES-specific context */
150 int keylen;
151 u8 key[AES_KEYSIZE_128];
152 struct crypto_skcipher *fallback;
153 };
154
155 struct sahara_aes_reqctx {
156 unsigned long mode;
157 };
158
159 /*
160 * struct sahara_sha_reqctx - private data per request
161 * @buf: holds data for requests smaller than block_size
162 * @rembuf: used to prepare one block_size-aligned request
163 * @context: hw-specific context for request. Digest is extracted from this
164 * @mode: specifies what type of hw-descriptor needs to be built
165 * @digest_size: length of digest for this request
166 * @context_size: length of hw-context for this request.
167 * Always digest_size + 4
168 * @buf_cnt: number of bytes saved in buf
169 * @sg_in_idx: number of hw links
170 * @in_sg: scatterlist for input data
171 * @in_sg_chain: scatterlists for chained input data
172 * @total: total number of bytes for transfer
173 * @last: is this the last block
174 * @first: is this the first block
175 * @active: inside a transfer
176 */
177 struct sahara_sha_reqctx {
178 u8 buf[SAHARA_MAX_SHA_BLOCK_SIZE];
179 u8 rembuf[SAHARA_MAX_SHA_BLOCK_SIZE];
180 u8 context[SHA256_DIGEST_SIZE + 4];
181 unsigned int mode;
182 unsigned int digest_size;
183 unsigned int context_size;
184 unsigned int buf_cnt;
185 unsigned int sg_in_idx;
186 struct scatterlist *in_sg;
187 struct scatterlist in_sg_chain[2];
188 size_t total;
189 unsigned int last;
190 unsigned int first;
191 unsigned int active;
192 };
193
194 struct sahara_dev {
195 struct device *device;
196 unsigned int version;
197 void __iomem *regs_base;
198 struct clk *clk_ipg;
199 struct clk *clk_ahb;
200 struct mutex queue_mutex;
201 struct task_struct *kthread;
202 struct completion dma_completion;
203
204 struct sahara_ctx *ctx;
205 spinlock_t lock;
206 struct crypto_queue queue;
207 unsigned long flags;
208
209 struct sahara_hw_desc *hw_desc[SAHARA_MAX_HW_DESC];
210 dma_addr_t hw_phys_desc[SAHARA_MAX_HW_DESC];
211
212 u8 *key_base;
213 dma_addr_t key_phys_base;
214
215 u8 *iv_base;
216 dma_addr_t iv_phys_base;
217
218 u8 *context_base;
219 dma_addr_t context_phys_base;
220
221 struct sahara_hw_link *hw_link[SAHARA_MAX_HW_LINK];
222 dma_addr_t hw_phys_link[SAHARA_MAX_HW_LINK];
223
224 size_t total;
225 struct scatterlist *in_sg;
226 int nb_in_sg;
227 struct scatterlist *out_sg;
228 int nb_out_sg;
229
230 u32 error;
231 };
232
233 static struct sahara_dev *dev_ptr;
234
235 static inline void sahara_write(struct sahara_dev *dev, u32 data, u32 reg)
236 {
237 writel(data, dev->regs_base + reg);
238 }
239
240 static inline unsigned int sahara_read(struct sahara_dev *dev, u32 reg)
241 {
242 return readl(dev->regs_base + reg);
243 }
244
245 static u32 sahara_aes_key_hdr(struct sahara_dev *dev)
246 {
247 u32 hdr = SAHARA_HDR_BASE | SAHARA_HDR_SKHA_ALG_AES |
248 SAHARA_HDR_FORM_KEY | SAHARA_HDR_LLO |
249 SAHARA_HDR_CHA_SKHA | SAHARA_HDR_PARITY_BIT;
250
251 if (dev->flags & FLAGS_CBC) {
252 hdr |= SAHARA_HDR_SKHA_MODE_CBC;
253 hdr ^= SAHARA_HDR_PARITY_BIT;
254 }
255
256 if (dev->flags & FLAGS_ENCRYPT) {
257 hdr |= SAHARA_HDR_SKHA_OP_ENC;
258 hdr ^= SAHARA_HDR_PARITY_BIT;
259 }
260
261 return hdr;
262 }
263
264 static u32 sahara_aes_data_link_hdr(struct sahara_dev *dev)
265 {
266 return SAHARA_HDR_BASE | SAHARA_HDR_FORM_DATA |
267 SAHARA_HDR_CHA_SKHA | SAHARA_HDR_PARITY_BIT;
268 }
269
270 static const char *sahara_err_src[16] = {
271 "No error",
272 "Header error",
273 "Descriptor length error",
274 "Descriptor length or pointer error",
275 "Link length error",
276 "Link pointer error",
277 "Input buffer error",
278 "Output buffer error",
279 "Output buffer starvation",
280 "Internal state fault",
281 "General descriptor problem",
282 "Reserved",
283 "Descriptor address error",
284 "Link address error",
285 "CHA error",
286 "DMA error"
287 };
288
289 static const char *sahara_err_dmasize[4] = {
290 "Byte transfer",
291 "Half-word transfer",
292 "Word transfer",
293 "Reserved"
294 };
295
296 static const char *sahara_err_dmasrc[8] = {
297 "No error",
298 "AHB bus error",
299 "Internal IP bus error",
300 "Parity error",
301 "DMA crosses 256 byte boundary",
302 "DMA is busy",
303 "Reserved",
304 "DMA HW error"
305 };
306
307 static const char *sahara_cha_errsrc[12] = {
308 "Input buffer non-empty",
309 "Illegal address",
310 "Illegal mode",
311 "Illegal data size",
312 "Illegal key size",
313 "Write during processing",
314 "CTX read during processing",
315 "HW error",
316 "Input buffer disabled/underflow",
317 "Output buffer disabled/overflow",
318 "DES key parity error",
319 "Reserved"
320 };
321
322 static const char *sahara_cha_err[4] = { "No error", "SKHA", "MDHA", "RNG" };
323
324 static void sahara_decode_error(struct sahara_dev *dev, unsigned int error)
325 {
326 u8 source = SAHARA_ERRSTATUS_GET_SOURCE(error);
327 u16 chasrc = ffs(SAHARA_ERRSTATUS_GET_CHASRC(error));
328
329 dev_err(dev->device, "%s: Error Register = 0x%08x\n", __func__, error);
330
331 dev_err(dev->device, " - %s.\n", sahara_err_src[source]);
332
333 if (source == SAHARA_ERRSOURCE_DMA) {
334 if (error & SAHARA_ERRSTATUS_DMA_DIR)
335 dev_err(dev->device, " * DMA read.\n");
336 else
337 dev_err(dev->device, " * DMA write.\n");
338
339 dev_err(dev->device, " * %s.\n",
340 sahara_err_dmasize[SAHARA_ERRSTATUS_GET_DMASZ(error)]);
341 dev_err(dev->device, " * %s.\n",
342 sahara_err_dmasrc[SAHARA_ERRSTATUS_GET_DMASRC(error)]);
343 } else if (source == SAHARA_ERRSOURCE_CHA) {
344 dev_err(dev->device, " * %s.\n",
345 sahara_cha_errsrc[chasrc]);
346 dev_err(dev->device, " * %s.\n",
347 sahara_cha_err[SAHARA_ERRSTATUS_GET_CHAERR(error)]);
348 }
349 dev_err(dev->device, "\n");
350 }
351
352 static const char *sahara_state[4] = { "Idle", "Busy", "Error", "HW Fault" };
353
354 static void sahara_decode_status(struct sahara_dev *dev, unsigned int status)
355 {
356 u8 state;
357
358 if (!IS_ENABLED(DEBUG))
359 return;
360
361 state = SAHARA_STATUS_GET_STATE(status);
362
363 dev_dbg(dev->device, "%s: Status Register = 0x%08x\n",
364 __func__, status);
365
366 dev_dbg(dev->device, " - State = %d:\n", state);
367 if (state & SAHARA_STATE_COMP_FLAG)
368 dev_dbg(dev->device, " * Descriptor completed. IRQ pending.\n");
369
370 dev_dbg(dev->device, " * %s.\n",
371 sahara_state[state & ~SAHARA_STATE_COMP_FLAG]);
372
373 if (status & SAHARA_STATUS_DAR_FULL)
374 dev_dbg(dev->device, " - DAR Full.\n");
375 if (status & SAHARA_STATUS_ERROR)
376 dev_dbg(dev->device, " - Error.\n");
377 if (status & SAHARA_STATUS_SECURE)
378 dev_dbg(dev->device, " - Secure.\n");
379 if (status & SAHARA_STATUS_FAIL)
380 dev_dbg(dev->device, " - Fail.\n");
381 if (status & SAHARA_STATUS_RNG_RESEED)
382 dev_dbg(dev->device, " - RNG Reseed Request.\n");
383 if (status & SAHARA_STATUS_ACTIVE_RNG)
384 dev_dbg(dev->device, " - RNG Active.\n");
385 if (status & SAHARA_STATUS_ACTIVE_MDHA)
386 dev_dbg(dev->device, " - MDHA Active.\n");
387 if (status & SAHARA_STATUS_ACTIVE_SKHA)
388 dev_dbg(dev->device, " - SKHA Active.\n");
389
390 if (status & SAHARA_STATUS_MODE_BATCH)
391 dev_dbg(dev->device, " - Batch Mode.\n");
392 else if (status & SAHARA_STATUS_MODE_DEDICATED)
393 dev_dbg(dev->device, " - Dedicated Mode.\n");
394 else if (status & SAHARA_STATUS_MODE_DEBUG)
395 dev_dbg(dev->device, " - Debug Mode.\n");
396
397 dev_dbg(dev->device, " - Internal state = 0x%02x\n",
398 SAHARA_STATUS_GET_ISTATE(status));
399
400 dev_dbg(dev->device, "Current DAR: 0x%08x\n",
401 sahara_read(dev, SAHARA_REG_CDAR));
402 dev_dbg(dev->device, "Initial DAR: 0x%08x\n\n",
403 sahara_read(dev, SAHARA_REG_IDAR));
404 }
405
406 static void sahara_dump_descriptors(struct sahara_dev *dev)
407 {
408 int i;
409
410 if (!IS_ENABLED(DEBUG))
411 return;
412
413 for (i = 0; i < SAHARA_MAX_HW_DESC; i++) {
414 dev_dbg(dev->device, "Descriptor (%d) (%pad):\n",
415 i, &dev->hw_phys_desc[i]);
416 dev_dbg(dev->device, "\thdr = 0x%08x\n", dev->hw_desc[i]->hdr);
417 dev_dbg(dev->device, "\tlen1 = %u\n", dev->hw_desc[i]->len1);
418 dev_dbg(dev->device, "\tp1 = 0x%08x\n", dev->hw_desc[i]->p1);
419 dev_dbg(dev->device, "\tlen2 = %u\n", dev->hw_desc[i]->len2);
420 dev_dbg(dev->device, "\tp2 = 0x%08x\n", dev->hw_desc[i]->p2);
421 dev_dbg(dev->device, "\tnext = 0x%08x\n",
422 dev->hw_desc[i]->next);
423 }
424 dev_dbg(dev->device, "\n");
425 }
426
427 static void sahara_dump_links(struct sahara_dev *dev)
428 {
429 int i;
430
431 if (!IS_ENABLED(DEBUG))
432 return;
433
434 for (i = 0; i < SAHARA_MAX_HW_LINK; i++) {
435 dev_dbg(dev->device, "Link (%d) (%pad):\n",
436 i, &dev->hw_phys_link[i]);
437 dev_dbg(dev->device, "\tlen = %u\n", dev->hw_link[i]->len);
438 dev_dbg(dev->device, "\tp = 0x%08x\n", dev->hw_link[i]->p);
439 dev_dbg(dev->device, "\tnext = 0x%08x\n",
440 dev->hw_link[i]->next);
441 }
442 dev_dbg(dev->device, "\n");
443 }
444
445 static int sahara_hw_descriptor_create(struct sahara_dev *dev)
446 {
447 struct sahara_ctx *ctx = dev->ctx;
448 struct scatterlist *sg;
449 int ret;
450 int i, j;
451 int idx = 0;
452
453 /* Copy new key if necessary */
454 if (ctx->flags & FLAGS_NEW_KEY) {
455 memcpy(dev->key_base, ctx->key, ctx->keylen);
456 ctx->flags &= ~FLAGS_NEW_KEY;
457
458 if (dev->flags & FLAGS_CBC) {
459 dev->hw_desc[idx]->len1 = AES_BLOCK_SIZE;
460 dev->hw_desc[idx]->p1 = dev->iv_phys_base;
461 } else {
462 dev->hw_desc[idx]->len1 = 0;
463 dev->hw_desc[idx]->p1 = 0;
464 }
465 dev->hw_desc[idx]->len2 = ctx->keylen;
466 dev->hw_desc[idx]->p2 = dev->key_phys_base;
467 dev->hw_desc[idx]->next = dev->hw_phys_desc[1];
468
469 dev->hw_desc[idx]->hdr = sahara_aes_key_hdr(dev);
470
471 idx++;
472 }
473
474 dev->nb_in_sg = sg_nents_for_len(dev->in_sg, dev->total);
475 if (dev->nb_in_sg < 0) {
476 dev_err(dev->device, "Invalid numbers of src SG.\n");
477 return dev->nb_in_sg;
478 }
479 dev->nb_out_sg = sg_nents_for_len(dev->out_sg, dev->total);
480 if (dev->nb_out_sg < 0) {
481 dev_err(dev->device, "Invalid numbers of dst SG.\n");
482 return dev->nb_out_sg;
483 }
484 if ((dev->nb_in_sg + dev->nb_out_sg) > SAHARA_MAX_HW_LINK) {
485 dev_err(dev->device, "not enough hw links (%d)\n",
486 dev->nb_in_sg + dev->nb_out_sg);
487 return -EINVAL;
488 }
489
490 ret = dma_map_sg(dev->device, dev->in_sg, dev->nb_in_sg,
491 DMA_TO_DEVICE);
492 if (ret != dev->nb_in_sg) {
493 dev_err(dev->device, "couldn't map in sg\n");
494 goto unmap_in;
495 }
496 ret = dma_map_sg(dev->device, dev->out_sg, dev->nb_out_sg,
497 DMA_FROM_DEVICE);
498 if (ret != dev->nb_out_sg) {
499 dev_err(dev->device, "couldn't map out sg\n");
500 goto unmap_out;
501 }
502
503 /* Create input links */
504 dev->hw_desc[idx]->p1 = dev->hw_phys_link[0];
505 sg = dev->in_sg;
506 for (i = 0; i < dev->nb_in_sg; i++) {
507 dev->hw_link[i]->len = sg->length;
508 dev->hw_link[i]->p = sg->dma_address;
509 if (i == (dev->nb_in_sg - 1)) {
510 dev->hw_link[i]->next = 0;
511 } else {
512 dev->hw_link[i]->next = dev->hw_phys_link[i + 1];
513 sg = sg_next(sg);
514 }
515 }
516
517 /* Create output links */
518 dev->hw_desc[idx]->p2 = dev->hw_phys_link[i];
519 sg = dev->out_sg;
520 for (j = i; j < dev->nb_out_sg + i; j++) {
521 dev->hw_link[j]->len = sg->length;
522 dev->hw_link[j]->p = sg->dma_address;
523 if (j == (dev->nb_out_sg + i - 1)) {
524 dev->hw_link[j]->next = 0;
525 } else {
526 dev->hw_link[j]->next = dev->hw_phys_link[j + 1];
527 sg = sg_next(sg);
528 }
529 }
530
531 /* Fill remaining fields of hw_desc[1] */
532 dev->hw_desc[idx]->hdr = sahara_aes_data_link_hdr(dev);
533 dev->hw_desc[idx]->len1 = dev->total;
534 dev->hw_desc[idx]->len2 = dev->total;
535 dev->hw_desc[idx]->next = 0;
536
537 sahara_dump_descriptors(dev);
538 sahara_dump_links(dev);
539
540 sahara_write(dev, dev->hw_phys_desc[0], SAHARA_REG_DAR);
541
542 return 0;
543
544 unmap_out:
545 dma_unmap_sg(dev->device, dev->out_sg, dev->nb_out_sg,
546 DMA_TO_DEVICE);
547 unmap_in:
548 dma_unmap_sg(dev->device, dev->in_sg, dev->nb_in_sg,
549 DMA_FROM_DEVICE);
550
551 return -EINVAL;
552 }
553
554 static int sahara_aes_process(struct ablkcipher_request *req)
555 {
556 struct sahara_dev *dev = dev_ptr;
557 struct sahara_ctx *ctx;
558 struct sahara_aes_reqctx *rctx;
559 int ret;
560 unsigned long timeout;
561
562 /* Request is ready to be dispatched by the device */
563 dev_dbg(dev->device,
564 "dispatch request (nbytes=%d, src=%p, dst=%p)\n",
565 req->nbytes, req->src, req->dst);
566
567 /* assign new request to device */
568 dev->total = req->nbytes;
569 dev->in_sg = req->src;
570 dev->out_sg = req->dst;
571
572 rctx = ablkcipher_request_ctx(req);
573 ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
574 rctx->mode &= FLAGS_MODE_MASK;
575 dev->flags = (dev->flags & ~FLAGS_MODE_MASK) | rctx->mode;
576
577 if ((dev->flags & FLAGS_CBC) && req->info)
578 memcpy(dev->iv_base, req->info, AES_KEYSIZE_128);
579
580 /* assign new context to device */
581 dev->ctx = ctx;
582
583 reinit_completion(&dev->dma_completion);
584
585 ret = sahara_hw_descriptor_create(dev);
586 if (ret)
587 return -EINVAL;
588
589 timeout = wait_for_completion_timeout(&dev->dma_completion,
590 msecs_to_jiffies(SAHARA_TIMEOUT_MS));
591 if (!timeout) {
592 dev_err(dev->device, "AES timeout\n");
593 return -ETIMEDOUT;
594 }
595
596 dma_unmap_sg(dev->device, dev->out_sg, dev->nb_out_sg,
597 DMA_TO_DEVICE);
598 dma_unmap_sg(dev->device, dev->in_sg, dev->nb_in_sg,
599 DMA_FROM_DEVICE);
600
601 return 0;
602 }
603
604 static int sahara_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
605 unsigned int keylen)
606 {
607 struct sahara_ctx *ctx = crypto_ablkcipher_ctx(tfm);
608 int ret;
609
610 ctx->keylen = keylen;
611
612 /* SAHARA only supports 128bit keys */
613 if (keylen == AES_KEYSIZE_128) {
614 memcpy(ctx->key, key, keylen);
615 ctx->flags |= FLAGS_NEW_KEY;
616 return 0;
617 }
618
619 if (keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_256)
620 return -EINVAL;
621
622 /*
623 * The requested key size is not supported by HW, do a fallback.
624 */
625 crypto_skcipher_clear_flags(ctx->fallback, CRYPTO_TFM_REQ_MASK);
626 crypto_skcipher_set_flags(ctx->fallback, tfm->base.crt_flags &
627 CRYPTO_TFM_REQ_MASK);
628
629 ret = crypto_skcipher_setkey(ctx->fallback, key, keylen);
630
631 tfm->base.crt_flags &= ~CRYPTO_TFM_RES_MASK;
632 tfm->base.crt_flags |= crypto_skcipher_get_flags(ctx->fallback) &
633 CRYPTO_TFM_RES_MASK;
634 return ret;
635 }
636
637 static int sahara_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
638 {
639 struct sahara_aes_reqctx *rctx = ablkcipher_request_ctx(req);
640 struct sahara_dev *dev = dev_ptr;
641 int err = 0;
642
643 dev_dbg(dev->device, "nbytes: %d, enc: %d, cbc: %d\n",
644 req->nbytes, !!(mode & FLAGS_ENCRYPT), !!(mode & FLAGS_CBC));
645
646 if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE)) {
647 dev_err(dev->device,
648 "request size is not exact amount of AES blocks\n");
649 return -EINVAL;
650 }
651
652 rctx->mode = mode;
653
654 mutex_lock(&dev->queue_mutex);
655 err = ablkcipher_enqueue_request(&dev->queue, req);
656 mutex_unlock(&dev->queue_mutex);
657
658 wake_up_process(dev->kthread);
659
660 return err;
661 }
662
663 static int sahara_aes_ecb_encrypt(struct ablkcipher_request *req)
664 {
665 struct sahara_ctx *ctx = crypto_ablkcipher_ctx(
666 crypto_ablkcipher_reqtfm(req));
667 int err;
668
669 if (unlikely(ctx->keylen != AES_KEYSIZE_128)) {
670 SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback);
671
672 skcipher_request_set_tfm(subreq, ctx->fallback);
673 skcipher_request_set_callback(subreq, req->base.flags,
674 NULL, NULL);
675 skcipher_request_set_crypt(subreq, req->src, req->dst,
676 req->nbytes, req->info);
677 err = crypto_skcipher_encrypt(subreq);
678 skcipher_request_zero(subreq);
679 return err;
680 }
681
682 return sahara_aes_crypt(req, FLAGS_ENCRYPT);
683 }
684
685 static int sahara_aes_ecb_decrypt(struct ablkcipher_request *req)
686 {
687 struct sahara_ctx *ctx = crypto_ablkcipher_ctx(
688 crypto_ablkcipher_reqtfm(req));
689 int err;
690
691 if (unlikely(ctx->keylen != AES_KEYSIZE_128)) {
692 SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback);
693
694 skcipher_request_set_tfm(subreq, ctx->fallback);
695 skcipher_request_set_callback(subreq, req->base.flags,
696 NULL, NULL);
697 skcipher_request_set_crypt(subreq, req->src, req->dst,
698 req->nbytes, req->info);
699 err = crypto_skcipher_decrypt(subreq);
700 skcipher_request_zero(subreq);
701 return err;
702 }
703
704 return sahara_aes_crypt(req, 0);
705 }
706
707 static int sahara_aes_cbc_encrypt(struct ablkcipher_request *req)
708 {
709 struct sahara_ctx *ctx = crypto_ablkcipher_ctx(
710 crypto_ablkcipher_reqtfm(req));
711 int err;
712
713 if (unlikely(ctx->keylen != AES_KEYSIZE_128)) {
714 SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback);
715
716 skcipher_request_set_tfm(subreq, ctx->fallback);
717 skcipher_request_set_callback(subreq, req->base.flags,
718 NULL, NULL);
719 skcipher_request_set_crypt(subreq, req->src, req->dst,
720 req->nbytes, req->info);
721 err = crypto_skcipher_encrypt(subreq);
722 skcipher_request_zero(subreq);
723 return err;
724 }
725
726 return sahara_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
727 }
728
729 static int sahara_aes_cbc_decrypt(struct ablkcipher_request *req)
730 {
731 struct sahara_ctx *ctx = crypto_ablkcipher_ctx(
732 crypto_ablkcipher_reqtfm(req));
733 int err;
734
735 if (unlikely(ctx->keylen != AES_KEYSIZE_128)) {
736 SKCIPHER_REQUEST_ON_STACK(subreq, ctx->fallback);
737
738 skcipher_request_set_tfm(subreq, ctx->fallback);
739 skcipher_request_set_callback(subreq, req->base.flags,
740 NULL, NULL);
741 skcipher_request_set_crypt(subreq, req->src, req->dst,
742 req->nbytes, req->info);
743 err = crypto_skcipher_decrypt(subreq);
744 skcipher_request_zero(subreq);
745 return err;
746 }
747
748 return sahara_aes_crypt(req, FLAGS_CBC);
749 }
750
751 static int sahara_aes_cra_init(struct crypto_tfm *tfm)
752 {
753 const char *name = crypto_tfm_alg_name(tfm);
754 struct sahara_ctx *ctx = crypto_tfm_ctx(tfm);
755
756 ctx->fallback = crypto_alloc_skcipher(name, 0,
757 CRYPTO_ALG_ASYNC |
758 CRYPTO_ALG_NEED_FALLBACK);
759 if (IS_ERR(ctx->fallback)) {
760 pr_err("Error allocating fallback algo %s\n", name);
761 return PTR_ERR(ctx->fallback);
762 }
763
764 tfm->crt_ablkcipher.reqsize = sizeof(struct sahara_aes_reqctx);
765
766 return 0;
767 }
768
769 static void sahara_aes_cra_exit(struct crypto_tfm *tfm)
770 {
771 struct sahara_ctx *ctx = crypto_tfm_ctx(tfm);
772
773 crypto_free_skcipher(ctx->fallback);
774 }
775
776 static u32 sahara_sha_init_hdr(struct sahara_dev *dev,
777 struct sahara_sha_reqctx *rctx)
778 {
779 u32 hdr = 0;
780
781 hdr = rctx->mode;
782
783 if (rctx->first) {
784 hdr |= SAHARA_HDR_MDHA_SET_MODE_HASH;
785 hdr |= SAHARA_HDR_MDHA_INIT;
786 } else {
787 hdr |= SAHARA_HDR_MDHA_SET_MODE_MD_KEY;
788 }
789
790 if (rctx->last)
791 hdr |= SAHARA_HDR_MDHA_PDATA;
792
793 if (hweight_long(hdr) % 2 == 0)
794 hdr |= SAHARA_HDR_PARITY_BIT;
795
796 return hdr;
797 }
798
799 static int sahara_sha_hw_links_create(struct sahara_dev *dev,
800 struct sahara_sha_reqctx *rctx,
801 int start)
802 {
803 struct scatterlist *sg;
804 unsigned int i;
805 int ret;
806
807 dev->in_sg = rctx->in_sg;
808
809 dev->nb_in_sg = sg_nents_for_len(dev->in_sg, rctx->total);
810 if (dev->nb_in_sg < 0) {
811 dev_err(dev->device, "Invalid numbers of src SG.\n");
812 return dev->nb_in_sg;
813 }
814 if ((dev->nb_in_sg) > SAHARA_MAX_HW_LINK) {
815 dev_err(dev->device, "not enough hw links (%d)\n",
816 dev->nb_in_sg + dev->nb_out_sg);
817 return -EINVAL;
818 }
819
820 sg = dev->in_sg;
821 ret = dma_map_sg(dev->device, dev->in_sg, dev->nb_in_sg, DMA_TO_DEVICE);
822 if (!ret)
823 return -EFAULT;
824
825 for (i = start; i < dev->nb_in_sg + start; i++) {
826 dev->hw_link[i]->len = sg->length;
827 dev->hw_link[i]->p = sg->dma_address;
828 if (i == (dev->nb_in_sg + start - 1)) {
829 dev->hw_link[i]->next = 0;
830 } else {
831 dev->hw_link[i]->next = dev->hw_phys_link[i + 1];
832 sg = sg_next(sg);
833 }
834 }
835
836 return i;
837 }
838
839 static int sahara_sha_hw_data_descriptor_create(struct sahara_dev *dev,
840 struct sahara_sha_reqctx *rctx,
841 struct ahash_request *req,
842 int index)
843 {
844 unsigned result_len;
845 int i = index;
846
847 if (rctx->first)
848 /* Create initial descriptor: #8*/
849 dev->hw_desc[index]->hdr = sahara_sha_init_hdr(dev, rctx);
850 else
851 /* Create hash descriptor: #10. Must follow #6. */
852 dev->hw_desc[index]->hdr = SAHARA_HDR_MDHA_HASH;
853
854 dev->hw_desc[index]->len1 = rctx->total;
855 if (dev->hw_desc[index]->len1 == 0) {
856 /* if len1 is 0, p1 must be 0, too */
857 dev->hw_desc[index]->p1 = 0;
858 rctx->sg_in_idx = 0;
859 } else {
860 /* Create input links */
861 dev->hw_desc[index]->p1 = dev->hw_phys_link[index];
862 i = sahara_sha_hw_links_create(dev, rctx, index);
863
864 rctx->sg_in_idx = index;
865 if (i < 0)
866 return i;
867 }
868
869 dev->hw_desc[index]->p2 = dev->hw_phys_link[i];
870
871 /* Save the context for the next operation */
872 result_len = rctx->context_size;
873 dev->hw_link[i]->p = dev->context_phys_base;
874
875 dev->hw_link[i]->len = result_len;
876 dev->hw_desc[index]->len2 = result_len;
877
878 dev->hw_link[i]->next = 0;
879
880 return 0;
881 }
882
883 /*
884 * Load descriptor aka #6
885 *
886 * To load a previously saved context back to the MDHA unit
887 *
888 * p1: Saved Context
889 * p2: NULL
890 *
891 */
892 static int sahara_sha_hw_context_descriptor_create(struct sahara_dev *dev,
893 struct sahara_sha_reqctx *rctx,
894 struct ahash_request *req,
895 int index)
896 {
897 dev->hw_desc[index]->hdr = sahara_sha_init_hdr(dev, rctx);
898
899 dev->hw_desc[index]->len1 = rctx->context_size;
900 dev->hw_desc[index]->p1 = dev->hw_phys_link[index];
901 dev->hw_desc[index]->len2 = 0;
902 dev->hw_desc[index]->p2 = 0;
903
904 dev->hw_link[index]->len = rctx->context_size;
905 dev->hw_link[index]->p = dev->context_phys_base;
906 dev->hw_link[index]->next = 0;
907
908 return 0;
909 }
910
911 static int sahara_walk_and_recalc(struct scatterlist *sg, unsigned int nbytes)
912 {
913 if (!sg || !sg->length)
914 return nbytes;
915
916 while (nbytes && sg) {
917 if (nbytes <= sg->length) {
918 sg->length = nbytes;
919 sg_mark_end(sg);
920 break;
921 }
922 nbytes -= sg->length;
923 sg = sg_next(sg);
924 }
925
926 return nbytes;
927 }
928
929 static int sahara_sha_prepare_request(struct ahash_request *req)
930 {
931 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
932 struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
933 unsigned int hash_later;
934 unsigned int block_size;
935 unsigned int len;
936
937 block_size = crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
938
939 /* append bytes from previous operation */
940 len = rctx->buf_cnt + req->nbytes;
941
942 /* only the last transfer can be padded in hardware */
943 if (!rctx->last && (len < block_size)) {
944 /* to few data, save for next operation */
945 scatterwalk_map_and_copy(rctx->buf + rctx->buf_cnt, req->src,
946 0, req->nbytes, 0);
947 rctx->buf_cnt += req->nbytes;
948
949 return 0;
950 }
951
952 /* add data from previous operation first */
953 if (rctx->buf_cnt)
954 memcpy(rctx->rembuf, rctx->buf, rctx->buf_cnt);
955
956 /* data must always be a multiple of block_size */
957 hash_later = rctx->last ? 0 : len & (block_size - 1);
958 if (hash_later) {
959 unsigned int offset = req->nbytes - hash_later;
960 /* Save remaining bytes for later use */
961 scatterwalk_map_and_copy(rctx->buf, req->src, offset,
962 hash_later, 0);
963 }
964
965 /* nbytes should now be multiple of blocksize */
966 req->nbytes = req->nbytes - hash_later;
967
968 sahara_walk_and_recalc(req->src, req->nbytes);
969
970 /* have data from previous operation and current */
971 if (rctx->buf_cnt && req->nbytes) {
972 sg_init_table(rctx->in_sg_chain, 2);
973 sg_set_buf(rctx->in_sg_chain, rctx->rembuf, rctx->buf_cnt);
974
975 sg_chain(rctx->in_sg_chain, 2, req->src);
976
977 rctx->total = req->nbytes + rctx->buf_cnt;
978 rctx->in_sg = rctx->in_sg_chain;
979
980 req->src = rctx->in_sg_chain;
981 /* only data from previous operation */
982 } else if (rctx->buf_cnt) {
983 if (req->src)
984 rctx->in_sg = req->src;
985 else
986 rctx->in_sg = rctx->in_sg_chain;
987 /* buf was copied into rembuf above */
988 sg_init_one(rctx->in_sg, rctx->rembuf, rctx->buf_cnt);
989 rctx->total = rctx->buf_cnt;
990 /* no data from previous operation */
991 } else {
992 rctx->in_sg = req->src;
993 rctx->total = req->nbytes;
994 req->src = rctx->in_sg;
995 }
996
997 /* on next call, we only have the remaining data in the buffer */
998 rctx->buf_cnt = hash_later;
999
1000 return -EINPROGRESS;
1001 }
1002
1003 static int sahara_sha_process(struct ahash_request *req)
1004 {
1005 struct sahara_dev *dev = dev_ptr;
1006 struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
1007 int ret;
1008 unsigned long timeout;
1009
1010 ret = sahara_sha_prepare_request(req);
1011 if (!ret)
1012 return ret;
1013
1014 if (rctx->first) {
1015 sahara_sha_hw_data_descriptor_create(dev, rctx, req, 0);
1016 dev->hw_desc[0]->next = 0;
1017 rctx->first = 0;
1018 } else {
1019 memcpy(dev->context_base, rctx->context, rctx->context_size);
1020
1021 sahara_sha_hw_context_descriptor_create(dev, rctx, req, 0);
1022 dev->hw_desc[0]->next = dev->hw_phys_desc[1];
1023 sahara_sha_hw_data_descriptor_create(dev, rctx, req, 1);
1024 dev->hw_desc[1]->next = 0;
1025 }
1026
1027 sahara_dump_descriptors(dev);
1028 sahara_dump_links(dev);
1029
1030 reinit_completion(&dev->dma_completion);
1031
1032 sahara_write(dev, dev->hw_phys_desc[0], SAHARA_REG_DAR);
1033
1034 timeout = wait_for_completion_timeout(&dev->dma_completion,
1035 msecs_to_jiffies(SAHARA_TIMEOUT_MS));
1036 if (!timeout) {
1037 dev_err(dev->device, "SHA timeout\n");
1038 return -ETIMEDOUT;
1039 }
1040
1041 if (rctx->sg_in_idx)
1042 dma_unmap_sg(dev->device, dev->in_sg, dev->nb_in_sg,
1043 DMA_TO_DEVICE);
1044
1045 memcpy(rctx->context, dev->context_base, rctx->context_size);
1046
1047 if (req->result)
1048 memcpy(req->result, rctx->context, rctx->digest_size);
1049
1050 return 0;
1051 }
1052
1053 static int sahara_queue_manage(void *data)
1054 {
1055 struct sahara_dev *dev = (struct sahara_dev *)data;
1056 struct crypto_async_request *async_req;
1057 struct crypto_async_request *backlog;
1058 int ret = 0;
1059
1060 do {
1061 __set_current_state(TASK_INTERRUPTIBLE);
1062
1063 mutex_lock(&dev->queue_mutex);
1064 backlog = crypto_get_backlog(&dev->queue);
1065 async_req = crypto_dequeue_request(&dev->queue);
1066 mutex_unlock(&dev->queue_mutex);
1067
1068 if (backlog)
1069 backlog->complete(backlog, -EINPROGRESS);
1070
1071 if (async_req) {
1072 if (crypto_tfm_alg_type(async_req->tfm) ==
1073 CRYPTO_ALG_TYPE_AHASH) {
1074 struct ahash_request *req =
1075 ahash_request_cast(async_req);
1076
1077 ret = sahara_sha_process(req);
1078 } else {
1079 struct ablkcipher_request *req =
1080 ablkcipher_request_cast(async_req);
1081
1082 ret = sahara_aes_process(req);
1083 }
1084
1085 async_req->complete(async_req, ret);
1086
1087 continue;
1088 }
1089
1090 schedule();
1091 } while (!kthread_should_stop());
1092
1093 return 0;
1094 }
1095
1096 static int sahara_sha_enqueue(struct ahash_request *req, int last)
1097 {
1098 struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
1099 struct sahara_dev *dev = dev_ptr;
1100 int ret;
1101
1102 if (!req->nbytes && !last)
1103 return 0;
1104
1105 rctx->last = last;
1106
1107 if (!rctx->active) {
1108 rctx->active = 1;
1109 rctx->first = 1;
1110 }
1111
1112 mutex_lock(&dev->queue_mutex);
1113 ret = crypto_enqueue_request(&dev->queue, &req->base);
1114 mutex_unlock(&dev->queue_mutex);
1115
1116 wake_up_process(dev->kthread);
1117
1118 return ret;
1119 }
1120
1121 static int sahara_sha_init(struct ahash_request *req)
1122 {
1123 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1124 struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
1125
1126 memset(rctx, 0, sizeof(*rctx));
1127
1128 switch (crypto_ahash_digestsize(tfm)) {
1129 case SHA1_DIGEST_SIZE:
1130 rctx->mode |= SAHARA_HDR_MDHA_ALG_SHA1;
1131 rctx->digest_size = SHA1_DIGEST_SIZE;
1132 break;
1133 case SHA256_DIGEST_SIZE:
1134 rctx->mode |= SAHARA_HDR_MDHA_ALG_SHA256;
1135 rctx->digest_size = SHA256_DIGEST_SIZE;
1136 break;
1137 default:
1138 return -EINVAL;
1139 }
1140
1141 rctx->context_size = rctx->digest_size + 4;
1142 rctx->active = 0;
1143
1144 return 0;
1145 }
1146
1147 static int sahara_sha_update(struct ahash_request *req)
1148 {
1149 return sahara_sha_enqueue(req, 0);
1150 }
1151
1152 static int sahara_sha_final(struct ahash_request *req)
1153 {
1154 req->nbytes = 0;
1155 return sahara_sha_enqueue(req, 1);
1156 }
1157
1158 static int sahara_sha_finup(struct ahash_request *req)
1159 {
1160 return sahara_sha_enqueue(req, 1);
1161 }
1162
1163 static int sahara_sha_digest(struct ahash_request *req)
1164 {
1165 sahara_sha_init(req);
1166
1167 return sahara_sha_finup(req);
1168 }
1169
1170 static int sahara_sha_export(struct ahash_request *req, void *out)
1171 {
1172 struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
1173
1174 memcpy(out, rctx, sizeof(struct sahara_sha_reqctx));
1175
1176 return 0;
1177 }
1178
1179 static int sahara_sha_import(struct ahash_request *req, const void *in)
1180 {
1181 struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
1182
1183 memcpy(rctx, in, sizeof(struct sahara_sha_reqctx));
1184
1185 return 0;
1186 }
1187
1188 static int sahara_sha_cra_init(struct crypto_tfm *tfm)
1189 {
1190 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
1191 sizeof(struct sahara_sha_reqctx) +
1192 SHA_BUFFER_LEN + SHA256_BLOCK_SIZE);
1193
1194 return 0;
1195 }
1196
1197 static struct crypto_alg aes_algs[] = {
1198 {
1199 .cra_name = "ecb(aes)",
1200 .cra_driver_name = "sahara-ecb-aes",
1201 .cra_priority = 300,
1202 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1203 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
1204 .cra_blocksize = AES_BLOCK_SIZE,
1205 .cra_ctxsize = sizeof(struct sahara_ctx),
1206 .cra_alignmask = 0x0,
1207 .cra_type = &crypto_ablkcipher_type,
1208 .cra_module = THIS_MODULE,
1209 .cra_init = sahara_aes_cra_init,
1210 .cra_exit = sahara_aes_cra_exit,
1211 .cra_u.ablkcipher = {
1212 .min_keysize = AES_MIN_KEY_SIZE ,
1213 .max_keysize = AES_MAX_KEY_SIZE,
1214 .setkey = sahara_aes_setkey,
1215 .encrypt = sahara_aes_ecb_encrypt,
1216 .decrypt = sahara_aes_ecb_decrypt,
1217 }
1218 }, {
1219 .cra_name = "cbc(aes)",
1220 .cra_driver_name = "sahara-cbc-aes",
1221 .cra_priority = 300,
1222 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1223 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
1224 .cra_blocksize = AES_BLOCK_SIZE,
1225 .cra_ctxsize = sizeof(struct sahara_ctx),
1226 .cra_alignmask = 0x0,
1227 .cra_type = &crypto_ablkcipher_type,
1228 .cra_module = THIS_MODULE,
1229 .cra_init = sahara_aes_cra_init,
1230 .cra_exit = sahara_aes_cra_exit,
1231 .cra_u.ablkcipher = {
1232 .min_keysize = AES_MIN_KEY_SIZE ,
1233 .max_keysize = AES_MAX_KEY_SIZE,
1234 .ivsize = AES_BLOCK_SIZE,
1235 .setkey = sahara_aes_setkey,
1236 .encrypt = sahara_aes_cbc_encrypt,
1237 .decrypt = sahara_aes_cbc_decrypt,
1238 }
1239 }
1240 };
1241
1242 static struct ahash_alg sha_v3_algs[] = {
1243 {
1244 .init = sahara_sha_init,
1245 .update = sahara_sha_update,
1246 .final = sahara_sha_final,
1247 .finup = sahara_sha_finup,
1248 .digest = sahara_sha_digest,
1249 .export = sahara_sha_export,
1250 .import = sahara_sha_import,
1251 .halg.digestsize = SHA1_DIGEST_SIZE,
1252 .halg.statesize = sizeof(struct sahara_sha_reqctx),
1253 .halg.base = {
1254 .cra_name = "sha1",
1255 .cra_driver_name = "sahara-sha1",
1256 .cra_priority = 300,
1257 .cra_flags = CRYPTO_ALG_TYPE_AHASH |
1258 CRYPTO_ALG_ASYNC |
1259 CRYPTO_ALG_NEED_FALLBACK,
1260 .cra_blocksize = SHA1_BLOCK_SIZE,
1261 .cra_ctxsize = sizeof(struct sahara_ctx),
1262 .cra_alignmask = 0,
1263 .cra_module = THIS_MODULE,
1264 .cra_init = sahara_sha_cra_init,
1265 }
1266 },
1267 };
1268
1269 static struct ahash_alg sha_v4_algs[] = {
1270 {
1271 .init = sahara_sha_init,
1272 .update = sahara_sha_update,
1273 .final = sahara_sha_final,
1274 .finup = sahara_sha_finup,
1275 .digest = sahara_sha_digest,
1276 .export = sahara_sha_export,
1277 .import = sahara_sha_import,
1278 .halg.digestsize = SHA256_DIGEST_SIZE,
1279 .halg.statesize = sizeof(struct sahara_sha_reqctx),
1280 .halg.base = {
1281 .cra_name = "sha256",
1282 .cra_driver_name = "sahara-sha256",
1283 .cra_priority = 300,
1284 .cra_flags = CRYPTO_ALG_TYPE_AHASH |
1285 CRYPTO_ALG_ASYNC |
1286 CRYPTO_ALG_NEED_FALLBACK,
1287 .cra_blocksize = SHA256_BLOCK_SIZE,
1288 .cra_ctxsize = sizeof(struct sahara_ctx),
1289 .cra_alignmask = 0,
1290 .cra_module = THIS_MODULE,
1291 .cra_init = sahara_sha_cra_init,
1292 }
1293 },
1294 };
1295
1296 static irqreturn_t sahara_irq_handler(int irq, void *data)
1297 {
1298 struct sahara_dev *dev = (struct sahara_dev *)data;
1299 unsigned int stat = sahara_read(dev, SAHARA_REG_STATUS);
1300 unsigned int err = sahara_read(dev, SAHARA_REG_ERRSTATUS);
1301
1302 sahara_write(dev, SAHARA_CMD_CLEAR_INT | SAHARA_CMD_CLEAR_ERR,
1303 SAHARA_REG_CMD);
1304
1305 sahara_decode_status(dev, stat);
1306
1307 if (SAHARA_STATUS_GET_STATE(stat) == SAHARA_STATE_BUSY) {
1308 return IRQ_NONE;
1309 } else if (SAHARA_STATUS_GET_STATE(stat) == SAHARA_STATE_COMPLETE) {
1310 dev->error = 0;
1311 } else {
1312 sahara_decode_error(dev, err);
1313 dev->error = -EINVAL;
1314 }
1315
1316 complete(&dev->dma_completion);
1317
1318 return IRQ_HANDLED;
1319 }
1320
1321
1322 static int sahara_register_algs(struct sahara_dev *dev)
1323 {
1324 int err;
1325 unsigned int i, j, k, l;
1326
1327 for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
1328 INIT_LIST_HEAD(&aes_algs[i].cra_list);
1329 err = crypto_register_alg(&aes_algs[i]);
1330 if (err)
1331 goto err_aes_algs;
1332 }
1333
1334 for (k = 0; k < ARRAY_SIZE(sha_v3_algs); k++) {
1335 err = crypto_register_ahash(&sha_v3_algs[k]);
1336 if (err)
1337 goto err_sha_v3_algs;
1338 }
1339
1340 if (dev->version > SAHARA_VERSION_3)
1341 for (l = 0; l < ARRAY_SIZE(sha_v4_algs); l++) {
1342 err = crypto_register_ahash(&sha_v4_algs[l]);
1343 if (err)
1344 goto err_sha_v4_algs;
1345 }
1346
1347 return 0;
1348
1349 err_sha_v4_algs:
1350 for (j = 0; j < l; j++)
1351 crypto_unregister_ahash(&sha_v4_algs[j]);
1352
1353 err_sha_v3_algs:
1354 for (j = 0; j < k; j++)
1355 crypto_unregister_ahash(&sha_v4_algs[j]);
1356
1357 err_aes_algs:
1358 for (j = 0; j < i; j++)
1359 crypto_unregister_alg(&aes_algs[j]);
1360
1361 return err;
1362 }
1363
1364 static void sahara_unregister_algs(struct sahara_dev *dev)
1365 {
1366 unsigned int i;
1367
1368 for (i = 0; i < ARRAY_SIZE(aes_algs); i++)
1369 crypto_unregister_alg(&aes_algs[i]);
1370
1371 for (i = 0; i < ARRAY_SIZE(sha_v4_algs); i++)
1372 crypto_unregister_ahash(&sha_v3_algs[i]);
1373
1374 if (dev->version > SAHARA_VERSION_3)
1375 for (i = 0; i < ARRAY_SIZE(sha_v4_algs); i++)
1376 crypto_unregister_ahash(&sha_v4_algs[i]);
1377 }
1378
1379 static struct platform_device_id sahara_platform_ids[] = {
1380 { .name = "sahara-imx27" },
1381 { /* sentinel */ }
1382 };
1383 MODULE_DEVICE_TABLE(platform, sahara_platform_ids);
1384
1385 static struct of_device_id sahara_dt_ids[] = {
1386 { .compatible = "fsl,imx53-sahara" },
1387 { .compatible = "fsl,imx27-sahara" },
1388 { /* sentinel */ }
1389 };
1390 MODULE_DEVICE_TABLE(of, sahara_dt_ids);
1391
1392 static int sahara_probe(struct platform_device *pdev)
1393 {
1394 struct sahara_dev *dev;
1395 struct resource *res;
1396 u32 version;
1397 int irq;
1398 int err;
1399 int i;
1400
1401 dev = devm_kzalloc(&pdev->dev, sizeof(struct sahara_dev), GFP_KERNEL);
1402 if (dev == NULL) {
1403 dev_err(&pdev->dev, "unable to alloc data struct.\n");
1404 return -ENOMEM;
1405 }
1406
1407 dev->device = &pdev->dev;
1408 platform_set_drvdata(pdev, dev);
1409
1410 /* Get the base address */
1411 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1412 dev->regs_base = devm_ioremap_resource(&pdev->dev, res);
1413 if (IS_ERR(dev->regs_base))
1414 return PTR_ERR(dev->regs_base);
1415
1416 /* Get the IRQ */
1417 irq = platform_get_irq(pdev, 0);
1418 if (irq < 0) {
1419 dev_err(&pdev->dev, "failed to get irq resource\n");
1420 return irq;
1421 }
1422
1423 err = devm_request_irq(&pdev->dev, irq, sahara_irq_handler,
1424 0, dev_name(&pdev->dev), dev);
1425 if (err) {
1426 dev_err(&pdev->dev, "failed to request irq\n");
1427 return err;
1428 }
1429
1430 /* clocks */
1431 dev->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1432 if (IS_ERR(dev->clk_ipg)) {
1433 dev_err(&pdev->dev, "Could not get ipg clock\n");
1434 return PTR_ERR(dev->clk_ipg);
1435 }
1436
1437 dev->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
1438 if (IS_ERR(dev->clk_ahb)) {
1439 dev_err(&pdev->dev, "Could not get ahb clock\n");
1440 return PTR_ERR(dev->clk_ahb);
1441 }
1442
1443 /* Allocate HW descriptors */
1444 dev->hw_desc[0] = dmam_alloc_coherent(&pdev->dev,
1445 SAHARA_MAX_HW_DESC * sizeof(struct sahara_hw_desc),
1446 &dev->hw_phys_desc[0], GFP_KERNEL);
1447 if (!dev->hw_desc[0]) {
1448 dev_err(&pdev->dev, "Could not allocate hw descriptors\n");
1449 return -ENOMEM;
1450 }
1451 dev->hw_desc[1] = dev->hw_desc[0] + 1;
1452 dev->hw_phys_desc[1] = dev->hw_phys_desc[0] +
1453 sizeof(struct sahara_hw_desc);
1454
1455 /* Allocate space for iv and key */
1456 dev->key_base = dmam_alloc_coherent(&pdev->dev, 2 * AES_KEYSIZE_128,
1457 &dev->key_phys_base, GFP_KERNEL);
1458 if (!dev->key_base) {
1459 dev_err(&pdev->dev, "Could not allocate memory for key\n");
1460 return -ENOMEM;
1461 }
1462 dev->iv_base = dev->key_base + AES_KEYSIZE_128;
1463 dev->iv_phys_base = dev->key_phys_base + AES_KEYSIZE_128;
1464
1465 /* Allocate space for context: largest digest + message length field */
1466 dev->context_base = dmam_alloc_coherent(&pdev->dev,
1467 SHA256_DIGEST_SIZE + 4,
1468 &dev->context_phys_base, GFP_KERNEL);
1469 if (!dev->context_base) {
1470 dev_err(&pdev->dev, "Could not allocate memory for MDHA context\n");
1471 return -ENOMEM;
1472 }
1473
1474 /* Allocate space for HW links */
1475 dev->hw_link[0] = dmam_alloc_coherent(&pdev->dev,
1476 SAHARA_MAX_HW_LINK * sizeof(struct sahara_hw_link),
1477 &dev->hw_phys_link[0], GFP_KERNEL);
1478 if (!dev->hw_link[0]) {
1479 dev_err(&pdev->dev, "Could not allocate hw links\n");
1480 return -ENOMEM;
1481 }
1482 for (i = 1; i < SAHARA_MAX_HW_LINK; i++) {
1483 dev->hw_phys_link[i] = dev->hw_phys_link[i - 1] +
1484 sizeof(struct sahara_hw_link);
1485 dev->hw_link[i] = dev->hw_link[i - 1] + 1;
1486 }
1487
1488 crypto_init_queue(&dev->queue, SAHARA_QUEUE_LENGTH);
1489
1490 spin_lock_init(&dev->lock);
1491 mutex_init(&dev->queue_mutex);
1492
1493 dev_ptr = dev;
1494
1495 dev->kthread = kthread_run(sahara_queue_manage, dev, "sahara_crypto");
1496 if (IS_ERR(dev->kthread)) {
1497 return PTR_ERR(dev->kthread);
1498 }
1499
1500 init_completion(&dev->dma_completion);
1501
1502 err = clk_prepare_enable(dev->clk_ipg);
1503 if (err)
1504 return err;
1505 err = clk_prepare_enable(dev->clk_ahb);
1506 if (err)
1507 goto clk_ipg_disable;
1508
1509 version = sahara_read(dev, SAHARA_REG_VERSION);
1510 if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx27-sahara")) {
1511 if (version != SAHARA_VERSION_3)
1512 err = -ENODEV;
1513 } else if (of_device_is_compatible(pdev->dev.of_node,
1514 "fsl,imx53-sahara")) {
1515 if (((version >> 8) & 0xff) != SAHARA_VERSION_4)
1516 err = -ENODEV;
1517 version = (version >> 8) & 0xff;
1518 }
1519 if (err == -ENODEV) {
1520 dev_err(&pdev->dev, "SAHARA version %d not supported\n",
1521 version);
1522 goto err_algs;
1523 }
1524
1525 dev->version = version;
1526
1527 sahara_write(dev, SAHARA_CMD_RESET | SAHARA_CMD_MODE_BATCH,
1528 SAHARA_REG_CMD);
1529 sahara_write(dev, SAHARA_CONTROL_SET_THROTTLE(0) |
1530 SAHARA_CONTROL_SET_MAXBURST(8) |
1531 SAHARA_CONTROL_RNG_AUTORSD |
1532 SAHARA_CONTROL_ENABLE_INT,
1533 SAHARA_REG_CONTROL);
1534
1535 err = sahara_register_algs(dev);
1536 if (err)
1537 goto err_algs;
1538
1539 dev_info(&pdev->dev, "SAHARA version %d initialized\n", version);
1540
1541 return 0;
1542
1543 err_algs:
1544 kthread_stop(dev->kthread);
1545 dev_ptr = NULL;
1546 clk_disable_unprepare(dev->clk_ahb);
1547 clk_ipg_disable:
1548 clk_disable_unprepare(dev->clk_ipg);
1549
1550 return err;
1551 }
1552
1553 static int sahara_remove(struct platform_device *pdev)
1554 {
1555 struct sahara_dev *dev = platform_get_drvdata(pdev);
1556
1557 kthread_stop(dev->kthread);
1558
1559 sahara_unregister_algs(dev);
1560
1561 clk_disable_unprepare(dev->clk_ipg);
1562 clk_disable_unprepare(dev->clk_ahb);
1563
1564 dev_ptr = NULL;
1565
1566 return 0;
1567 }
1568
1569 static struct platform_driver sahara_driver = {
1570 .probe = sahara_probe,
1571 .remove = sahara_remove,
1572 .driver = {
1573 .name = SAHARA_NAME,
1574 .of_match_table = sahara_dt_ids,
1575 },
1576 .id_table = sahara_platform_ids,
1577 };
1578
1579 module_platform_driver(sahara_driver);
1580
1581 MODULE_LICENSE("GPL");
1582 MODULE_AUTHOR("Javier Martin <javier.martin@vista-silicon.com>");
1583 MODULE_AUTHOR("Steffen Trumtrar <s.trumtrar@pengutronix.de>");
1584 MODULE_DESCRIPTION("SAHARA2 HW crypto accelerator");
Linux with added FPC-III support