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Revert "unicode: Don't special case ignorable code points"
[linux.git] / drivers / crypto / sahara.c
blob533080b0cddc96ee2416085e96894a50a3e93796
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Cryptographic API.
4 *
5 * Support for SAHARA cryptographic accelerator.
6 *
7 * Copyright (c) 2014 Steffen Trumtrar <s.trumtrar@pengutronix.de>
8 * Copyright (c) 2013 Vista Silicon S.L.
9 * Author: Javier Martin <javier.martin@vista-silicon.com>
10 *
11 * Based on omap-aes.c and tegra-aes.c
12 */
13
14 #include <crypto/aes.h>
15 #include <crypto/internal/hash.h>
16 #include <crypto/internal/skcipher.h>
17 #include <crypto/scatterwalk.h>
18 #include <crypto/engine.h>
19 #include <crypto/sha1.h>
20 #include <crypto/sha2.h>
21
22 #include <linux/clk.h>
23 #include <linux/dma-mapping.h>
24 #include <linux/interrupt.h>
25 #include <linux/io.h>
26 #include <linux/irq.h>
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/of.h>
30 #include <linux/platform_device.h>
31 #include <linux/spinlock.h>
32
33 #define SHA_BUFFER_LEN PAGE_SIZE
34 #define SAHARA_MAX_SHA_BLOCK_SIZE SHA256_BLOCK_SIZE
35
36 #define SAHARA_NAME "sahara"
37 #define SAHARA_VERSION_3 3
38 #define SAHARA_VERSION_4 4
39 #define SAHARA_TIMEOUT_MS 1000
40 #define SAHARA_MAX_HW_DESC 2
41 #define SAHARA_MAX_HW_LINK 20
42
43 #define FLAGS_MODE_MASK 0x000f
44 #define FLAGS_ENCRYPT BIT(0)
45 #define FLAGS_CBC BIT(1)
46
47 #define SAHARA_HDR_BASE 0x00800000
48 #define SAHARA_HDR_SKHA_ALG_AES 0
49 #define SAHARA_HDR_SKHA_MODE_ECB 0
50 #define SAHARA_HDR_SKHA_OP_ENC BIT(2)
51 #define SAHARA_HDR_SKHA_MODE_CBC BIT(3)
52 #define SAHARA_HDR_FORM_DATA (5 << 16)
53 #define SAHARA_HDR_FORM_KEY BIT(19)
54 #define SAHARA_HDR_LLO BIT(24)
55 #define SAHARA_HDR_CHA_SKHA BIT(28)
56 #define SAHARA_HDR_CHA_MDHA BIT(29)
57 #define SAHARA_HDR_PARITY_BIT BIT(31)
58
59 #define SAHARA_HDR_MDHA_SET_MODE_MD_KEY 0x20880000
60 #define SAHARA_HDR_MDHA_SET_MODE_HASH 0x208D0000
61 #define SAHARA_HDR_MDHA_HASH 0xA0850000
62 #define SAHARA_HDR_MDHA_STORE_DIGEST 0x20820000
63 #define SAHARA_HDR_MDHA_ALG_SHA1 0
64 #define SAHARA_HDR_MDHA_ALG_MD5 1
65 #define SAHARA_HDR_MDHA_ALG_SHA256 2
66 #define SAHARA_HDR_MDHA_ALG_SHA224 3
67 #define SAHARA_HDR_MDHA_PDATA BIT(2)
68 #define SAHARA_HDR_MDHA_HMAC BIT(3)
69 #define SAHARA_HDR_MDHA_INIT BIT(5)
70 #define SAHARA_HDR_MDHA_IPAD BIT(6)
71 #define SAHARA_HDR_MDHA_OPAD BIT(7)
72 #define SAHARA_HDR_MDHA_SWAP BIT(8)
73 #define SAHARA_HDR_MDHA_MAC_FULL BIT(9)
74 #define SAHARA_HDR_MDHA_SSL BIT(10)
75
76 #define SAHARA_REG_VERSION 0x00
77 #define SAHARA_REG_DAR 0x04
78 #define SAHARA_REG_CONTROL 0x08
79 #define SAHARA_CONTROL_SET_THROTTLE(x) (((x) & 0xff) << 24)
80 #define SAHARA_CONTROL_SET_MAXBURST(x) (((x) & 0xff) << 16)
81 #define SAHARA_CONTROL_RNG_AUTORSD BIT(7)
82 #define SAHARA_CONTROL_ENABLE_INT BIT(4)
83 #define SAHARA_REG_CMD 0x0C
84 #define SAHARA_CMD_RESET BIT(0)
85 #define SAHARA_CMD_CLEAR_INT BIT(8)
86 #define SAHARA_CMD_CLEAR_ERR BIT(9)
87 #define SAHARA_CMD_SINGLE_STEP BIT(10)
88 #define SAHARA_CMD_MODE_BATCH BIT(16)
89 #define SAHARA_CMD_MODE_DEBUG BIT(18)
90 #define SAHARA_REG_STATUS 0x10
91 #define SAHARA_STATUS_GET_STATE(x) ((x) & 0x7)
92 #define SAHARA_STATE_IDLE 0
93 #define SAHARA_STATE_BUSY 1
94 #define SAHARA_STATE_ERR 2
95 #define SAHARA_STATE_FAULT 3
96 #define SAHARA_STATE_COMPLETE 4
97 #define SAHARA_STATE_COMP_FLAG BIT(2)
98 #define SAHARA_STATUS_DAR_FULL BIT(3)
99 #define SAHARA_STATUS_ERROR BIT(4)
100 #define SAHARA_STATUS_SECURE BIT(5)
101 #define SAHARA_STATUS_FAIL BIT(6)
102 #define SAHARA_STATUS_INIT BIT(7)
103 #define SAHARA_STATUS_RNG_RESEED BIT(8)
104 #define SAHARA_STATUS_ACTIVE_RNG BIT(9)
105 #define SAHARA_STATUS_ACTIVE_MDHA BIT(10)
106 #define SAHARA_STATUS_ACTIVE_SKHA BIT(11)
107 #define SAHARA_STATUS_MODE_BATCH BIT(16)
108 #define SAHARA_STATUS_MODE_DEDICATED BIT(17)
109 #define SAHARA_STATUS_MODE_DEBUG BIT(18)
110 #define SAHARA_STATUS_GET_ISTATE(x) (((x) >> 24) & 0xff)
111 #define SAHARA_REG_ERRSTATUS 0x14
112 #define SAHARA_ERRSTATUS_GET_SOURCE(x) ((x) & 0xf)
113 #define SAHARA_ERRSOURCE_CHA 14
114 #define SAHARA_ERRSOURCE_DMA 15
115 #define SAHARA_ERRSTATUS_DMA_DIR BIT(8)
116 #define SAHARA_ERRSTATUS_GET_DMASZ(x) (((x) >> 9) & 0x3)
117 #define SAHARA_ERRSTATUS_GET_DMASRC(x) (((x) >> 13) & 0x7)
118 #define SAHARA_ERRSTATUS_GET_CHASRC(x) (((x) >> 16) & 0xfff)
119 #define SAHARA_ERRSTATUS_GET_CHAERR(x) (((x) >> 28) & 0x3)
120 #define SAHARA_REG_FADDR 0x18
121 #define SAHARA_REG_CDAR 0x1C
122 #define SAHARA_REG_IDAR 0x20
123
124 struct sahara_hw_desc {
125 u32 hdr;
126 u32 len1;
127 u32 p1;
128 u32 len2;
129 u32 p2;
130 u32 next;
131 };
132
133 struct sahara_hw_link {
134 u32 len;
135 u32 p;
136 u32 next;
137 };
138
139 struct sahara_ctx {
140 /* AES-specific context */
141 int keylen;
142 u8 key[AES_KEYSIZE_128];
143 struct crypto_skcipher *fallback;
144 };
145
146 struct sahara_aes_reqctx {
147 unsigned long mode;
148 u8 iv_out[AES_BLOCK_SIZE];
149 struct skcipher_request fallback_req; // keep at the end
150 };
151
152 /*
153 * struct sahara_sha_reqctx - private data per request
154 * @buf: holds data for requests smaller than block_size
155 * @rembuf: used to prepare one block_size-aligned request
156 * @context: hw-specific context for request. Digest is extracted from this
157 * @mode: specifies what type of hw-descriptor needs to be built
158 * @digest_size: length of digest for this request
159 * @context_size: length of hw-context for this request.
160 * Always digest_size + 4
161 * @buf_cnt: number of bytes saved in buf
162 * @sg_in_idx: number of hw links
163 * @in_sg: scatterlist for input data
164 * @in_sg_chain: scatterlists for chained input data
165 * @total: total number of bytes for transfer
166 * @last: is this the last block
167 * @first: is this the first block
168 */
169 struct sahara_sha_reqctx {
170 u8 buf[SAHARA_MAX_SHA_BLOCK_SIZE];
171 u8 rembuf[SAHARA_MAX_SHA_BLOCK_SIZE];
172 u8 context[SHA256_DIGEST_SIZE + 4];
173 unsigned int mode;
174 unsigned int digest_size;
175 unsigned int context_size;
176 unsigned int buf_cnt;
177 unsigned int sg_in_idx;
178 struct scatterlist *in_sg;
179 struct scatterlist in_sg_chain[2];
180 size_t total;
181 unsigned int last;
182 unsigned int first;
183 };
184
185 struct sahara_dev {
186 struct device *device;
187 unsigned int version;
188 void __iomem *regs_base;
189 struct clk *clk_ipg;
190 struct clk *clk_ahb;
191 struct completion dma_completion;
192
193 struct sahara_ctx *ctx;
194 unsigned long flags;
195
196 struct sahara_hw_desc *hw_desc[SAHARA_MAX_HW_DESC];
197 dma_addr_t hw_phys_desc[SAHARA_MAX_HW_DESC];
198
199 u8 *key_base;
200 dma_addr_t key_phys_base;
201
202 u8 *iv_base;
203 dma_addr_t iv_phys_base;
204
205 u8 *context_base;
206 dma_addr_t context_phys_base;
207
208 struct sahara_hw_link *hw_link[SAHARA_MAX_HW_LINK];
209 dma_addr_t hw_phys_link[SAHARA_MAX_HW_LINK];
210
211 size_t total;
212 struct scatterlist *in_sg;
213 int nb_in_sg;
214 struct scatterlist *out_sg;
215 int nb_out_sg;
216
217 struct crypto_engine *engine;
218 };
219
220 static struct sahara_dev *dev_ptr;
221
222 static inline void sahara_write(struct sahara_dev *dev, u32 data, u32 reg)
223 {
224 writel(data, dev->regs_base + reg);
225 }
226
227 static inline unsigned int sahara_read(struct sahara_dev *dev, u32 reg)
228 {
229 return readl(dev->regs_base + reg);
230 }
231
232 static u32 sahara_aes_key_hdr(struct sahara_dev *dev)
233 {
234 u32 hdr = SAHARA_HDR_BASE | SAHARA_HDR_SKHA_ALG_AES |
235 SAHARA_HDR_FORM_KEY | SAHARA_HDR_LLO |
236 SAHARA_HDR_CHA_SKHA | SAHARA_HDR_PARITY_BIT;
237
238 if (dev->flags & FLAGS_CBC) {
239 hdr |= SAHARA_HDR_SKHA_MODE_CBC;
240 hdr ^= SAHARA_HDR_PARITY_BIT;
241 }
242
243 if (dev->flags & FLAGS_ENCRYPT) {
244 hdr |= SAHARA_HDR_SKHA_OP_ENC;
245 hdr ^= SAHARA_HDR_PARITY_BIT;
246 }
247
248 return hdr;
249 }
250
251 static u32 sahara_aes_data_link_hdr(struct sahara_dev *dev)
252 {
253 return SAHARA_HDR_BASE | SAHARA_HDR_FORM_DATA |
254 SAHARA_HDR_CHA_SKHA | SAHARA_HDR_PARITY_BIT;
255 }
256
257 static const char *sahara_err_src[16] = {
258 "No error",
259 "Header error",
260 "Descriptor length error",
261 "Descriptor length or pointer error",
262 "Link length error",
263 "Link pointer error",
264 "Input buffer error",
265 "Output buffer error",
266 "Output buffer starvation",
267 "Internal state fault",
268 "General descriptor problem",
269 "Reserved",
270 "Descriptor address error",
271 "Link address error",
272 "CHA error",
273 "DMA error"
274 };
275
276 static const char *sahara_err_dmasize[4] = {
277 "Byte transfer",
278 "Half-word transfer",
279 "Word transfer",
280 "Reserved"
281 };
282
283 static const char *sahara_err_dmasrc[8] = {
284 "No error",
285 "AHB bus error",
286 "Internal IP bus error",
287 "Parity error",
288 "DMA crosses 256 byte boundary",
289 "DMA is busy",
290 "Reserved",
291 "DMA HW error"
292 };
293
294 static const char *sahara_cha_errsrc[12] = {
295 "Input buffer non-empty",
296 "Illegal address",
297 "Illegal mode",
298 "Illegal data size",
299 "Illegal key size",
300 "Write during processing",
301 "CTX read during processing",
302 "HW error",
303 "Input buffer disabled/underflow",
304 "Output buffer disabled/overflow",
305 "DES key parity error",
306 "Reserved"
307 };
308
309 static const char *sahara_cha_err[4] = { "No error", "SKHA", "MDHA", "RNG" };
310
311 static void sahara_decode_error(struct sahara_dev *dev, unsigned int error)
312 {
313 u8 source = SAHARA_ERRSTATUS_GET_SOURCE(error);
314 u16 chasrc = ffs(SAHARA_ERRSTATUS_GET_CHASRC(error));
315
316 dev_err(dev->device, "%s: Error Register = 0x%08x\n", __func__, error);
317
318 dev_err(dev->device, " - %s.\n", sahara_err_src[source]);
319
320 if (source == SAHARA_ERRSOURCE_DMA) {
321 if (error & SAHARA_ERRSTATUS_DMA_DIR)
322 dev_err(dev->device, " * DMA read.\n");
323 else
324 dev_err(dev->device, " * DMA write.\n");
325
326 dev_err(dev->device, " * %s.\n",
327 sahara_err_dmasize[SAHARA_ERRSTATUS_GET_DMASZ(error)]);
328 dev_err(dev->device, " * %s.\n",
329 sahara_err_dmasrc[SAHARA_ERRSTATUS_GET_DMASRC(error)]);
330 } else if (source == SAHARA_ERRSOURCE_CHA) {
331 dev_err(dev->device, " * %s.\n",
332 sahara_cha_errsrc[chasrc]);
333 dev_err(dev->device, " * %s.\n",
334 sahara_cha_err[SAHARA_ERRSTATUS_GET_CHAERR(error)]);
335 }
336 dev_err(dev->device, "\n");
337 }
338
339 static const char *sahara_state[4] = { "Idle", "Busy", "Error", "HW Fault" };
340
341 static void sahara_decode_status(struct sahara_dev *dev, unsigned int status)
342 {
343 u8 state;
344
345 if (!__is_defined(DEBUG))
346 return;
347
348 state = SAHARA_STATUS_GET_STATE(status);
349
350 dev_dbg(dev->device, "%s: Status Register = 0x%08x\n",
351 __func__, status);
352
353 dev_dbg(dev->device, " - State = %d:\n", state);
354 if (state & SAHARA_STATE_COMP_FLAG)
355 dev_dbg(dev->device, " * Descriptor completed. IRQ pending.\n");
356
357 dev_dbg(dev->device, " * %s.\n",
358 sahara_state[state & ~SAHARA_STATE_COMP_FLAG]);
359
360 if (status & SAHARA_STATUS_DAR_FULL)
361 dev_dbg(dev->device, " - DAR Full.\n");
362 if (status & SAHARA_STATUS_ERROR)
363 dev_dbg(dev->device, " - Error.\n");
364 if (status & SAHARA_STATUS_SECURE)
365 dev_dbg(dev->device, " - Secure.\n");
366 if (status & SAHARA_STATUS_FAIL)
367 dev_dbg(dev->device, " - Fail.\n");
368 if (status & SAHARA_STATUS_RNG_RESEED)
369 dev_dbg(dev->device, " - RNG Reseed Request.\n");
370 if (status & SAHARA_STATUS_ACTIVE_RNG)
371 dev_dbg(dev->device, " - RNG Active.\n");
372 if (status & SAHARA_STATUS_ACTIVE_MDHA)
373 dev_dbg(dev->device, " - MDHA Active.\n");
374 if (status & SAHARA_STATUS_ACTIVE_SKHA)
375 dev_dbg(dev->device, " - SKHA Active.\n");
376
377 if (status & SAHARA_STATUS_MODE_BATCH)
378 dev_dbg(dev->device, " - Batch Mode.\n");
379 else if (status & SAHARA_STATUS_MODE_DEDICATED)
380 dev_dbg(dev->device, " - Dedicated Mode.\n");
381 else if (status & SAHARA_STATUS_MODE_DEBUG)
382 dev_dbg(dev->device, " - Debug Mode.\n");
383
384 dev_dbg(dev->device, " - Internal state = 0x%02x\n",
385 SAHARA_STATUS_GET_ISTATE(status));
386
387 dev_dbg(dev->device, "Current DAR: 0x%08x\n",
388 sahara_read(dev, SAHARA_REG_CDAR));
389 dev_dbg(dev->device, "Initial DAR: 0x%08x\n\n",
390 sahara_read(dev, SAHARA_REG_IDAR));
391 }
392
393 static void sahara_dump_descriptors(struct sahara_dev *dev)
394 {
395 int i;
396
397 if (!__is_defined(DEBUG))
398 return;
399
400 for (i = 0; i < SAHARA_MAX_HW_DESC; i++) {
401 dev_dbg(dev->device, "Descriptor (%d) (%pad):\n",
402 i, &dev->hw_phys_desc[i]);
403 dev_dbg(dev->device, "\thdr = 0x%08x\n", dev->hw_desc[i]->hdr);
404 dev_dbg(dev->device, "\tlen1 = %u\n", dev->hw_desc[i]->len1);
405 dev_dbg(dev->device, "\tp1 = 0x%08x\n", dev->hw_desc[i]->p1);
406 dev_dbg(dev->device, "\tlen2 = %u\n", dev->hw_desc[i]->len2);
407 dev_dbg(dev->device, "\tp2 = 0x%08x\n", dev->hw_desc[i]->p2);
408 dev_dbg(dev->device, "\tnext = 0x%08x\n",
409 dev->hw_desc[i]->next);
410 }
411 dev_dbg(dev->device, "\n");
412 }
413
414 static void sahara_dump_links(struct sahara_dev *dev)
415 {
416 int i;
417
418 if (!__is_defined(DEBUG))
419 return;
420
421 for (i = 0; i < SAHARA_MAX_HW_LINK; i++) {
422 dev_dbg(dev->device, "Link (%d) (%pad):\n",
423 i, &dev->hw_phys_link[i]);
424 dev_dbg(dev->device, "\tlen = %u\n", dev->hw_link[i]->len);
425 dev_dbg(dev->device, "\tp = 0x%08x\n", dev->hw_link[i]->p);
426 dev_dbg(dev->device, "\tnext = 0x%08x\n",
427 dev->hw_link[i]->next);
428 }
429 dev_dbg(dev->device, "\n");
430 }
431
432 static int sahara_hw_descriptor_create(struct sahara_dev *dev)
433 {
434 struct sahara_ctx *ctx = dev->ctx;
435 struct scatterlist *sg;
436 int ret;
437 int i, j;
438 int idx = 0;
439 u32 len;
440
441 memcpy(dev->key_base, ctx->key, ctx->keylen);
442
443 if (dev->flags & FLAGS_CBC) {
444 dev->hw_desc[idx]->len1 = AES_BLOCK_SIZE;
445 dev->hw_desc[idx]->p1 = dev->iv_phys_base;
446 } else {
447 dev->hw_desc[idx]->len1 = 0;
448 dev->hw_desc[idx]->p1 = 0;
449 }
450 dev->hw_desc[idx]->len2 = ctx->keylen;
451 dev->hw_desc[idx]->p2 = dev->key_phys_base;
452 dev->hw_desc[idx]->next = dev->hw_phys_desc[1];
453 dev->hw_desc[idx]->hdr = sahara_aes_key_hdr(dev);
454
455 idx++;
456
457
458 dev->nb_in_sg = sg_nents_for_len(dev->in_sg, dev->total);
459 if (dev->nb_in_sg < 0) {
460 dev_err(dev->device, "Invalid numbers of src SG.\n");
461 return dev->nb_in_sg;
462 }
463 dev->nb_out_sg = sg_nents_for_len(dev->out_sg, dev->total);
464 if (dev->nb_out_sg < 0) {
465 dev_err(dev->device, "Invalid numbers of dst SG.\n");
466 return dev->nb_out_sg;
467 }
468 if ((dev->nb_in_sg + dev->nb_out_sg) > SAHARA_MAX_HW_LINK) {
469 dev_err(dev->device, "not enough hw links (%d)\n",
470 dev->nb_in_sg + dev->nb_out_sg);
471 return -EINVAL;
472 }
473
474 ret = dma_map_sg(dev->device, dev->in_sg, dev->nb_in_sg,
475 DMA_TO_DEVICE);
476 if (!ret) {
477 dev_err(dev->device, "couldn't map in sg\n");
478 return -EINVAL;
479 }
480
481 ret = dma_map_sg(dev->device, dev->out_sg, dev->nb_out_sg,
482 DMA_FROM_DEVICE);
483 if (!ret) {
484 dev_err(dev->device, "couldn't map out sg\n");
485 goto unmap_in;
486 }
487
488 /* Create input links */
489 dev->hw_desc[idx]->p1 = dev->hw_phys_link[0];
490 sg = dev->in_sg;
491 len = dev->total;
492 for (i = 0; i < dev->nb_in_sg; i++) {
493 dev->hw_link[i]->len = min(len, sg->length);
494 dev->hw_link[i]->p = sg->dma_address;
495 if (i == (dev->nb_in_sg - 1)) {
496 dev->hw_link[i]->next = 0;
497 } else {
498 len -= min(len, sg->length);
499 dev->hw_link[i]->next = dev->hw_phys_link[i + 1];
500 sg = sg_next(sg);
501 }
502 }
503
504 /* Create output links */
505 dev->hw_desc[idx]->p2 = dev->hw_phys_link[i];
506 sg = dev->out_sg;
507 len = dev->total;
508 for (j = i; j < dev->nb_out_sg + i; j++) {
509 dev->hw_link[j]->len = min(len, sg->length);
510 dev->hw_link[j]->p = sg->dma_address;
511 if (j == (dev->nb_out_sg + i - 1)) {
512 dev->hw_link[j]->next = 0;
513 } else {
514 len -= min(len, sg->length);
515 dev->hw_link[j]->next = dev->hw_phys_link[j + 1];
516 sg = sg_next(sg);
517 }
518 }
519
520 /* Fill remaining fields of hw_desc[1] */
521 dev->hw_desc[idx]->hdr = sahara_aes_data_link_hdr(dev);
522 dev->hw_desc[idx]->len1 = dev->total;
523 dev->hw_desc[idx]->len2 = dev->total;
524 dev->hw_desc[idx]->next = 0;
525
526 sahara_dump_descriptors(dev);
527 sahara_dump_links(dev);
528
529 sahara_write(dev, dev->hw_phys_desc[0], SAHARA_REG_DAR);
530
531 return 0;
532
533 unmap_in:
534 dma_unmap_sg(dev->device, dev->in_sg, dev->nb_in_sg,
535 DMA_TO_DEVICE);
536
537 return -EINVAL;
538 }
539
540 static void sahara_aes_cbc_update_iv(struct skcipher_request *req)
541 {
542 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
543 struct sahara_aes_reqctx *rctx = skcipher_request_ctx(req);
544 unsigned int ivsize = crypto_skcipher_ivsize(skcipher);
545
546 /* Update IV buffer to contain the last ciphertext block */
547 if (rctx->mode & FLAGS_ENCRYPT) {
548 sg_pcopy_to_buffer(req->dst, sg_nents(req->dst), req->iv,
549 ivsize, req->cryptlen - ivsize);
550 } else {
551 memcpy(req->iv, rctx->iv_out, ivsize);
552 }
553 }
554
555 static int sahara_aes_process(struct skcipher_request *req)
556 {
557 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
558 struct sahara_dev *dev = dev_ptr;
559 struct sahara_ctx *ctx;
560 struct sahara_aes_reqctx *rctx;
561 int ret;
562 unsigned long time_left;
563
564 /* Request is ready to be dispatched by the device */
565 dev_dbg(dev->device,
566 "dispatch request (nbytes=%d, src=%p, dst=%p)\n",
567 req->cryptlen, req->src, req->dst);
568
569 /* assign new request to device */
570 dev->total = req->cryptlen;
571 dev->in_sg = req->src;
572 dev->out_sg = req->dst;
573
574 rctx = skcipher_request_ctx(req);
575 ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
576 rctx->mode &= FLAGS_MODE_MASK;
577 dev->flags = (dev->flags & ~FLAGS_MODE_MASK) | rctx->mode;
578
579 if ((dev->flags & FLAGS_CBC) && req->iv) {
580 unsigned int ivsize = crypto_skcipher_ivsize(skcipher);
581
582 memcpy(dev->iv_base, req->iv, ivsize);
583
584 if (!(dev->flags & FLAGS_ENCRYPT)) {
585 sg_pcopy_to_buffer(req->src, sg_nents(req->src),
586 rctx->iv_out, ivsize,
587 req->cryptlen - ivsize);
588 }
589 }
590
591 /* assign new context to device */
592 dev->ctx = ctx;
593
594 reinit_completion(&dev->dma_completion);
595
596 ret = sahara_hw_descriptor_create(dev);
597 if (ret)
598 return -EINVAL;
599
600 time_left = wait_for_completion_timeout(&dev->dma_completion,
601 msecs_to_jiffies(SAHARA_TIMEOUT_MS));
602
603 dma_unmap_sg(dev->device, dev->out_sg, dev->nb_out_sg,
604 DMA_FROM_DEVICE);
605 dma_unmap_sg(dev->device, dev->in_sg, dev->nb_in_sg,
606 DMA_TO_DEVICE);
607
608 if (!time_left) {
609 dev_err(dev->device, "AES timeout\n");
610 return -ETIMEDOUT;
611 }
612
613 if ((dev->flags & FLAGS_CBC) && req->iv)
614 sahara_aes_cbc_update_iv(req);
615
616 return 0;
617 }
618
619 static int sahara_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
620 unsigned int keylen)
621 {
622 struct sahara_ctx *ctx = crypto_skcipher_ctx(tfm);
623
624 ctx->keylen = keylen;
625
626 /* SAHARA only supports 128bit keys */
627 if (keylen == AES_KEYSIZE_128) {
628 memcpy(ctx->key, key, keylen);
629 return 0;
630 }
631
632 if (keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_256)
633 return -EINVAL;
634
635 /*
636 * The requested key size is not supported by HW, do a fallback.
637 */
638 crypto_skcipher_clear_flags(ctx->fallback, CRYPTO_TFM_REQ_MASK);
639 crypto_skcipher_set_flags(ctx->fallback, tfm->base.crt_flags &
640 CRYPTO_TFM_REQ_MASK);
641 return crypto_skcipher_setkey(ctx->fallback, key, keylen);
642 }
643
644 static int sahara_aes_fallback(struct skcipher_request *req, unsigned long mode)
645 {
646 struct sahara_aes_reqctx *rctx = skcipher_request_ctx(req);
647 struct sahara_ctx *ctx = crypto_skcipher_ctx(
648 crypto_skcipher_reqtfm(req));
649
650 skcipher_request_set_tfm(&rctx->fallback_req, ctx->fallback);
651 skcipher_request_set_callback(&rctx->fallback_req,
652 req->base.flags,
653 req->base.complete,
654 req->base.data);
655 skcipher_request_set_crypt(&rctx->fallback_req, req->src,
656 req->dst, req->cryptlen, req->iv);
657
658 if (mode & FLAGS_ENCRYPT)
659 return crypto_skcipher_encrypt(&rctx->fallback_req);
660
661 return crypto_skcipher_decrypt(&rctx->fallback_req);
662 }
663
664 static int sahara_aes_crypt(struct skcipher_request *req, unsigned long mode)
665 {
666 struct sahara_aes_reqctx *rctx = skcipher_request_ctx(req);
667 struct sahara_ctx *ctx = crypto_skcipher_ctx(
668 crypto_skcipher_reqtfm(req));
669 struct sahara_dev *dev = dev_ptr;
670
671 if (!req->cryptlen)
672 return 0;
673
674 if (unlikely(ctx->keylen != AES_KEYSIZE_128))
675 return sahara_aes_fallback(req, mode);
676
677 dev_dbg(dev->device, "nbytes: %d, enc: %d, cbc: %d\n",
678 req->cryptlen, !!(mode & FLAGS_ENCRYPT), !!(mode & FLAGS_CBC));
679
680 if (!IS_ALIGNED(req->cryptlen, AES_BLOCK_SIZE))
681 return -EINVAL;
682
683 rctx->mode = mode;
684
685 return crypto_transfer_skcipher_request_to_engine(dev->engine, req);
686 }
687
688 static int sahara_aes_ecb_encrypt(struct skcipher_request *req)
689 {
690 return sahara_aes_crypt(req, FLAGS_ENCRYPT);
691 }
692
693 static int sahara_aes_ecb_decrypt(struct skcipher_request *req)
694 {
695 return sahara_aes_crypt(req, 0);
696 }
697
698 static int sahara_aes_cbc_encrypt(struct skcipher_request *req)
699 {
700 return sahara_aes_crypt(req, FLAGS_ENCRYPT | FLAGS_CBC);
701 }
702
703 static int sahara_aes_cbc_decrypt(struct skcipher_request *req)
704 {
705 return sahara_aes_crypt(req, FLAGS_CBC);
706 }
707
708 static int sahara_aes_init_tfm(struct crypto_skcipher *tfm)
709 {
710 const char *name = crypto_tfm_alg_name(&tfm->base);
711 struct sahara_ctx *ctx = crypto_skcipher_ctx(tfm);
712
713 ctx->fallback = crypto_alloc_skcipher(name, 0,
714 CRYPTO_ALG_NEED_FALLBACK);
715 if (IS_ERR(ctx->fallback)) {
716 pr_err("Error allocating fallback algo %s\n", name);
717 return PTR_ERR(ctx->fallback);
718 }
719
720 crypto_skcipher_set_reqsize(tfm, sizeof(struct sahara_aes_reqctx) +
721 crypto_skcipher_reqsize(ctx->fallback));
722
723 return 0;
724 }
725
726 static void sahara_aes_exit_tfm(struct crypto_skcipher *tfm)
727 {
728 struct sahara_ctx *ctx = crypto_skcipher_ctx(tfm);
729
730 crypto_free_skcipher(ctx->fallback);
731 }
732
733 static u32 sahara_sha_init_hdr(struct sahara_dev *dev,
734 struct sahara_sha_reqctx *rctx)
735 {
736 u32 hdr = 0;
737
738 hdr = rctx->mode;
739
740 if (rctx->first) {
741 hdr |= SAHARA_HDR_MDHA_SET_MODE_HASH;
742 hdr |= SAHARA_HDR_MDHA_INIT;
743 } else {
744 hdr |= SAHARA_HDR_MDHA_SET_MODE_MD_KEY;
745 }
746
747 if (rctx->last)
748 hdr |= SAHARA_HDR_MDHA_PDATA;
749
750 if (hweight_long(hdr) % 2 == 0)
751 hdr |= SAHARA_HDR_PARITY_BIT;
752
753 return hdr;
754 }
755
756 static int sahara_sha_hw_links_create(struct sahara_dev *dev,
757 struct sahara_sha_reqctx *rctx,
758 int start)
759 {
760 struct scatterlist *sg;
761 unsigned int len;
762 unsigned int i;
763 int ret;
764
765 dev->in_sg = rctx->in_sg;
766
767 dev->nb_in_sg = sg_nents_for_len(dev->in_sg, rctx->total);
768 if (dev->nb_in_sg < 0) {
769 dev_err(dev->device, "Invalid numbers of src SG.\n");
770 return dev->nb_in_sg;
771 }
772 if ((dev->nb_in_sg) > SAHARA_MAX_HW_LINK) {
773 dev_err(dev->device, "not enough hw links (%d)\n",
774 dev->nb_in_sg + dev->nb_out_sg);
775 return -EINVAL;
776 }
777
778 sg = dev->in_sg;
779 ret = dma_map_sg(dev->device, dev->in_sg, dev->nb_in_sg, DMA_TO_DEVICE);
780 if (!ret)
781 return -EFAULT;
782
783 len = rctx->total;
784 for (i = start; i < dev->nb_in_sg + start; i++) {
785 dev->hw_link[i]->len = min(len, sg->length);
786 dev->hw_link[i]->p = sg->dma_address;
787 if (i == (dev->nb_in_sg + start - 1)) {
788 dev->hw_link[i]->next = 0;
789 } else {
790 len -= min(len, sg->length);
791 dev->hw_link[i]->next = dev->hw_phys_link[i + 1];
792 sg = sg_next(sg);
793 }
794 }
795
796 return i;
797 }
798
799 static int sahara_sha_hw_data_descriptor_create(struct sahara_dev *dev,
800 struct sahara_sha_reqctx *rctx,
801 struct ahash_request *req,
802 int index)
803 {
804 unsigned result_len;
805 int i = index;
806
807 if (rctx->first)
808 /* Create initial descriptor: #8*/
809 dev->hw_desc[index]->hdr = sahara_sha_init_hdr(dev, rctx);
810 else
811 /* Create hash descriptor: #10. Must follow #6. */
812 dev->hw_desc[index]->hdr = SAHARA_HDR_MDHA_HASH;
813
814 dev->hw_desc[index]->len1 = rctx->total;
815 if (dev->hw_desc[index]->len1 == 0) {
816 /* if len1 is 0, p1 must be 0, too */
817 dev->hw_desc[index]->p1 = 0;
818 rctx->sg_in_idx = 0;
819 } else {
820 /* Create input links */
821 dev->hw_desc[index]->p1 = dev->hw_phys_link[index];
822 i = sahara_sha_hw_links_create(dev, rctx, index);
823
824 rctx->sg_in_idx = index;
825 if (i < 0)
826 return i;
827 }
828
829 dev->hw_desc[index]->p2 = dev->hw_phys_link[i];
830
831 /* Save the context for the next operation */
832 result_len = rctx->context_size;
833 dev->hw_link[i]->p = dev->context_phys_base;
834
835 dev->hw_link[i]->len = result_len;
836 dev->hw_desc[index]->len2 = result_len;
837
838 dev->hw_link[i]->next = 0;
839
840 return 0;
841 }
842
843 /*
844 * Load descriptor aka #6
845 *
846 * To load a previously saved context back to the MDHA unit
847 *
848 * p1: Saved Context
849 * p2: NULL
850 *
851 */
852 static int sahara_sha_hw_context_descriptor_create(struct sahara_dev *dev,
853 struct sahara_sha_reqctx *rctx,
854 struct ahash_request *req,
855 int index)
856 {
857 dev->hw_desc[index]->hdr = sahara_sha_init_hdr(dev, rctx);
858
859 dev->hw_desc[index]->len1 = rctx->context_size;
860 dev->hw_desc[index]->p1 = dev->hw_phys_link[index];
861 dev->hw_desc[index]->len2 = 0;
862 dev->hw_desc[index]->p2 = 0;
863
864 dev->hw_link[index]->len = rctx->context_size;
865 dev->hw_link[index]->p = dev->context_phys_base;
866 dev->hw_link[index]->next = 0;
867
868 return 0;
869 }
870
871 static int sahara_sha_prepare_request(struct ahash_request *req)
872 {
873 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
874 struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
875 unsigned int hash_later;
876 unsigned int block_size;
877 unsigned int len;
878
879 block_size = crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm));
880
881 /* append bytes from previous operation */
882 len = rctx->buf_cnt + req->nbytes;
883
884 /* only the last transfer can be padded in hardware */
885 if (!rctx->last && (len < block_size)) {
886 /* to few data, save for next operation */
887 scatterwalk_map_and_copy(rctx->buf + rctx->buf_cnt, req->src,
888 0, req->nbytes, 0);
889 rctx->buf_cnt += req->nbytes;
890
891 return 0;
892 }
893
894 /* add data from previous operation first */
895 if (rctx->buf_cnt)
896 memcpy(rctx->rembuf, rctx->buf, rctx->buf_cnt);
897
898 /* data must always be a multiple of block_size */
899 hash_later = rctx->last ? 0 : len & (block_size - 1);
900 if (hash_later) {
901 unsigned int offset = req->nbytes - hash_later;
902 /* Save remaining bytes for later use */
903 scatterwalk_map_and_copy(rctx->buf, req->src, offset,
904 hash_later, 0);
905 }
906
907 rctx->total = len - hash_later;
908 /* have data from previous operation and current */
909 if (rctx->buf_cnt && req->nbytes) {
910 sg_init_table(rctx->in_sg_chain, 2);
911 sg_set_buf(rctx->in_sg_chain, rctx->rembuf, rctx->buf_cnt);
912 sg_chain(rctx->in_sg_chain, 2, req->src);
913 rctx->in_sg = rctx->in_sg_chain;
914 /* only data from previous operation */
915 } else if (rctx->buf_cnt) {
916 rctx->in_sg = rctx->in_sg_chain;
917 sg_init_one(rctx->in_sg, rctx->rembuf, rctx->buf_cnt);
918 /* no data from previous operation */
919 } else {
920 rctx->in_sg = req->src;
921 }
922
923 /* on next call, we only have the remaining data in the buffer */
924 rctx->buf_cnt = hash_later;
925
926 return -EINPROGRESS;
927 }
928
929 static int sahara_sha_process(struct ahash_request *req)
930 {
931 struct sahara_dev *dev = dev_ptr;
932 struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
933 int ret;
934 unsigned long time_left;
935
936 ret = sahara_sha_prepare_request(req);
937 if (!ret)
938 return ret;
939
940 if (rctx->first) {
941 ret = sahara_sha_hw_data_descriptor_create(dev, rctx, req, 0);
942 if (ret)
943 return ret;
944
945 dev->hw_desc[0]->next = 0;
946 rctx->first = 0;
947 } else {
948 memcpy(dev->context_base, rctx->context, rctx->context_size);
949
950 sahara_sha_hw_context_descriptor_create(dev, rctx, req, 0);
951 dev->hw_desc[0]->next = dev->hw_phys_desc[1];
952 ret = sahara_sha_hw_data_descriptor_create(dev, rctx, req, 1);
953 if (ret)
954 return ret;
955
956 dev->hw_desc[1]->next = 0;
957 }
958
959 sahara_dump_descriptors(dev);
960 sahara_dump_links(dev);
961
962 reinit_completion(&dev->dma_completion);
963
964 sahara_write(dev, dev->hw_phys_desc[0], SAHARA_REG_DAR);
965
966 time_left = wait_for_completion_timeout(&dev->dma_completion,
967 msecs_to_jiffies(SAHARA_TIMEOUT_MS));
968
969 if (rctx->sg_in_idx)
970 dma_unmap_sg(dev->device, dev->in_sg, dev->nb_in_sg,
971 DMA_TO_DEVICE);
972
973 if (!time_left) {
974 dev_err(dev->device, "SHA timeout\n");
975 return -ETIMEDOUT;
976 }
977
978 memcpy(rctx->context, dev->context_base, rctx->context_size);
979
980 if (req->result && rctx->last)
981 memcpy(req->result, rctx->context, rctx->digest_size);
982
983 return 0;
984 }
985
986 static int sahara_do_one_request(struct crypto_engine *engine, void *areq)
987 {
988 struct crypto_async_request *async_req = areq;
989 int err;
990
991 if (crypto_tfm_alg_type(async_req->tfm) == CRYPTO_ALG_TYPE_AHASH) {
992 struct ahash_request *req = ahash_request_cast(async_req);
993
994 err = sahara_sha_process(req);
995 local_bh_disable();
996 crypto_finalize_hash_request(engine, req, err);
997 local_bh_enable();
998 } else {
999 struct skcipher_request *req = skcipher_request_cast(async_req);
1000
1001 err = sahara_aes_process(skcipher_request_cast(async_req));
1002 local_bh_disable();
1003 crypto_finalize_skcipher_request(engine, req, err);
1004 local_bh_enable();
1005 }
1006
1007 return 0;
1008 }
1009
1010 static int sahara_sha_enqueue(struct ahash_request *req, int last)
1011 {
1012 struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
1013 struct sahara_dev *dev = dev_ptr;
1014
1015 if (!req->nbytes && !last)
1016 return 0;
1017
1018 rctx->last = last;
1019
1020 return crypto_transfer_hash_request_to_engine(dev->engine, req);
1021 }
1022
1023 static int sahara_sha_init(struct ahash_request *req)
1024 {
1025 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
1026 struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
1027
1028 memset(rctx, 0, sizeof(*rctx));
1029
1030 switch (crypto_ahash_digestsize(tfm)) {
1031 case SHA1_DIGEST_SIZE:
1032 rctx->mode |= SAHARA_HDR_MDHA_ALG_SHA1;
1033 rctx->digest_size = SHA1_DIGEST_SIZE;
1034 break;
1035 case SHA256_DIGEST_SIZE:
1036 rctx->mode |= SAHARA_HDR_MDHA_ALG_SHA256;
1037 rctx->digest_size = SHA256_DIGEST_SIZE;
1038 break;
1039 default:
1040 return -EINVAL;
1041 }
1042
1043 rctx->context_size = rctx->digest_size + 4;
1044 rctx->first = 1;
1045
1046 return 0;
1047 }
1048
1049 static int sahara_sha_update(struct ahash_request *req)
1050 {
1051 return sahara_sha_enqueue(req, 0);
1052 }
1053
1054 static int sahara_sha_final(struct ahash_request *req)
1055 {
1056 req->nbytes = 0;
1057 return sahara_sha_enqueue(req, 1);
1058 }
1059
1060 static int sahara_sha_finup(struct ahash_request *req)
1061 {
1062 return sahara_sha_enqueue(req, 1);
1063 }
1064
1065 static int sahara_sha_digest(struct ahash_request *req)
1066 {
1067 sahara_sha_init(req);
1068
1069 return sahara_sha_finup(req);
1070 }
1071
1072 static int sahara_sha_export(struct ahash_request *req, void *out)
1073 {
1074 struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
1075
1076 memcpy(out, rctx, sizeof(struct sahara_sha_reqctx));
1077
1078 return 0;
1079 }
1080
1081 static int sahara_sha_import(struct ahash_request *req, const void *in)
1082 {
1083 struct sahara_sha_reqctx *rctx = ahash_request_ctx(req);
1084
1085 memcpy(rctx, in, sizeof(struct sahara_sha_reqctx));
1086
1087 return 0;
1088 }
1089
1090 static int sahara_sha_cra_init(struct crypto_tfm *tfm)
1091 {
1092 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
1093 sizeof(struct sahara_sha_reqctx));
1094
1095 return 0;
1096 }
1097
1098 static struct skcipher_engine_alg aes_algs[] = {
1099 {
1100 .base = {
1101 .base.cra_name = "ecb(aes)",
1102 .base.cra_driver_name = "sahara-ecb-aes",
1103 .base.cra_priority = 300,
1104 .base.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
1105 .base.cra_blocksize = AES_BLOCK_SIZE,
1106 .base.cra_ctxsize = sizeof(struct sahara_ctx),
1107 .base.cra_alignmask = 0x0,
1108 .base.cra_module = THIS_MODULE,
1109
1110 .init = sahara_aes_init_tfm,
1111 .exit = sahara_aes_exit_tfm,
1112 .min_keysize = AES_MIN_KEY_SIZE,
1113 .max_keysize = AES_MAX_KEY_SIZE,
1114 .setkey = sahara_aes_setkey,
1115 .encrypt = sahara_aes_ecb_encrypt,
1116 .decrypt = sahara_aes_ecb_decrypt,
1117 },
1118 .op = {
1119 .do_one_request = sahara_do_one_request,
1120 },
1121 }, {
1122 .base = {
1123 .base.cra_name = "cbc(aes)",
1124 .base.cra_driver_name = "sahara-cbc-aes",
1125 .base.cra_priority = 300,
1126 .base.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK,
1127 .base.cra_blocksize = AES_BLOCK_SIZE,
1128 .base.cra_ctxsize = sizeof(struct sahara_ctx),
1129 .base.cra_alignmask = 0x0,
1130 .base.cra_module = THIS_MODULE,
1131
1132 .init = sahara_aes_init_tfm,
1133 .exit = sahara_aes_exit_tfm,
1134 .min_keysize = AES_MIN_KEY_SIZE,
1135 .max_keysize = AES_MAX_KEY_SIZE,
1136 .ivsize = AES_BLOCK_SIZE,
1137 .setkey = sahara_aes_setkey,
1138 .encrypt = sahara_aes_cbc_encrypt,
1139 .decrypt = sahara_aes_cbc_decrypt,
1140 },
1141 .op = {
1142 .do_one_request = sahara_do_one_request,
1143 },
1144 }
1145 };
1146
1147 static struct ahash_engine_alg sha_v3_algs[] = {
1148 {
1149 .base = {
1150 .init = sahara_sha_init,
1151 .update = sahara_sha_update,
1152 .final = sahara_sha_final,
1153 .finup = sahara_sha_finup,
1154 .digest = sahara_sha_digest,
1155 .export = sahara_sha_export,
1156 .import = sahara_sha_import,
1157 .halg.digestsize = SHA1_DIGEST_SIZE,
1158 .halg.statesize = sizeof(struct sahara_sha_reqctx),
1159 .halg.base = {
1160 .cra_name = "sha1",
1161 .cra_driver_name = "sahara-sha1",
1162 .cra_priority = 300,
1163 .cra_flags = CRYPTO_ALG_ASYNC |
1164 CRYPTO_ALG_NEED_FALLBACK,
1165 .cra_blocksize = SHA1_BLOCK_SIZE,
1166 .cra_ctxsize = sizeof(struct sahara_ctx),
1167 .cra_alignmask = 0,
1168 .cra_module = THIS_MODULE,
1169 .cra_init = sahara_sha_cra_init,
1170 }
1171 },
1172 .op = {
1173 .do_one_request = sahara_do_one_request,
1174 },
1175 },
1176 };
1177
1178 static struct ahash_engine_alg sha_v4_algs[] = {
1179 {
1180 .base = {
1181 .init = sahara_sha_init,
1182 .update = sahara_sha_update,
1183 .final = sahara_sha_final,
1184 .finup = sahara_sha_finup,
1185 .digest = sahara_sha_digest,
1186 .export = sahara_sha_export,
1187 .import = sahara_sha_import,
1188 .halg.digestsize = SHA256_DIGEST_SIZE,
1189 .halg.statesize = sizeof(struct sahara_sha_reqctx),
1190 .halg.base = {
1191 .cra_name = "sha256",
1192 .cra_driver_name = "sahara-sha256",
1193 .cra_priority = 300,
1194 .cra_flags = CRYPTO_ALG_ASYNC |
1195 CRYPTO_ALG_NEED_FALLBACK,
1196 .cra_blocksize = SHA256_BLOCK_SIZE,
1197 .cra_ctxsize = sizeof(struct sahara_ctx),
1198 .cra_alignmask = 0,
1199 .cra_module = THIS_MODULE,
1200 .cra_init = sahara_sha_cra_init,
1201 }
1202 },
1203 .op = {
1204 .do_one_request = sahara_do_one_request,
1205 },
1206 },
1207 };
1208
1209 static irqreturn_t sahara_irq_handler(int irq, void *data)
1210 {
1211 struct sahara_dev *dev = data;
1212 unsigned int stat = sahara_read(dev, SAHARA_REG_STATUS);
1213 unsigned int err = sahara_read(dev, SAHARA_REG_ERRSTATUS);
1214
1215 sahara_write(dev, SAHARA_CMD_CLEAR_INT | SAHARA_CMD_CLEAR_ERR,
1216 SAHARA_REG_CMD);
1217
1218 sahara_decode_status(dev, stat);
1219
1220 if (SAHARA_STATUS_GET_STATE(stat) == SAHARA_STATE_BUSY)
1221 return IRQ_NONE;
1222
1223 if (SAHARA_STATUS_GET_STATE(stat) != SAHARA_STATE_COMPLETE)
1224 sahara_decode_error(dev, err);
1225
1226 complete(&dev->dma_completion);
1227
1228 return IRQ_HANDLED;
1229 }
1230
1231
1232 static int sahara_register_algs(struct sahara_dev *dev)
1233 {
1234 int err;
1235
1236 err = crypto_engine_register_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
1237 if (err)
1238 return err;
1239
1240 err = crypto_engine_register_ahashes(sha_v3_algs,
1241 ARRAY_SIZE(sha_v3_algs));
1242 if (err)
1243 goto err_aes_algs;
1244
1245 if (dev->version > SAHARA_VERSION_3) {
1246 err = crypto_engine_register_ahashes(sha_v4_algs,
1247 ARRAY_SIZE(sha_v4_algs));
1248 if (err)
1249 goto err_sha_v3_algs;
1250 }
1251
1252 return 0;
1253
1254 err_sha_v3_algs:
1255 crypto_engine_unregister_ahashes(sha_v3_algs, ARRAY_SIZE(sha_v3_algs));
1256
1257 err_aes_algs:
1258 crypto_engine_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
1259
1260 return err;
1261 }
1262
1263 static void sahara_unregister_algs(struct sahara_dev *dev)
1264 {
1265 crypto_engine_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
1266 crypto_engine_unregister_ahashes(sha_v3_algs, ARRAY_SIZE(sha_v3_algs));
1267
1268 if (dev->version > SAHARA_VERSION_3)
1269 crypto_engine_unregister_ahashes(sha_v4_algs,
1270 ARRAY_SIZE(sha_v4_algs));
1271 }
1272
1273 static const struct of_device_id sahara_dt_ids[] = {
1274 { .compatible = "fsl,imx53-sahara" },
1275 { .compatible = "fsl,imx27-sahara" },
1276 { /* sentinel */ }
1277 };
1278 MODULE_DEVICE_TABLE(of, sahara_dt_ids);
1279
1280 static int sahara_probe(struct platform_device *pdev)
1281 {
1282 struct sahara_dev *dev;
1283 u32 version;
1284 int irq;
1285 int err;
1286 int i;
1287
1288 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
1289 if (!dev)
1290 return -ENOMEM;
1291
1292 dev->device = &pdev->dev;
1293 platform_set_drvdata(pdev, dev);
1294
1295 /* Get the base address */
1296 dev->regs_base = devm_platform_ioremap_resource(pdev, 0);
1297 if (IS_ERR(dev->regs_base))
1298 return PTR_ERR(dev->regs_base);
1299
1300 /* Get the IRQ */
1301 irq = platform_get_irq(pdev, 0);
1302 if (irq < 0)
1303 return irq;
1304
1305 err = devm_request_irq(&pdev->dev, irq, sahara_irq_handler,
1306 0, dev_name(&pdev->dev), dev);
1307 if (err)
1308 return dev_err_probe(&pdev->dev, err,
1309 "failed to request irq\n");
1310
1311 /* clocks */
1312 dev->clk_ipg = devm_clk_get_enabled(&pdev->dev, "ipg");
1313 if (IS_ERR(dev->clk_ipg))
1314 return dev_err_probe(&pdev->dev, PTR_ERR(dev->clk_ipg),
1315 "Could not get ipg clock\n");
1316
1317 dev->clk_ahb = devm_clk_get_enabled(&pdev->dev, "ahb");
1318 if (IS_ERR(dev->clk_ahb))
1319 return dev_err_probe(&pdev->dev, PTR_ERR(dev->clk_ahb),
1320 "Could not get ahb clock\n");
1321
1322 /* Allocate HW descriptors */
1323 dev->hw_desc[0] = dmam_alloc_coherent(&pdev->dev,
1324 SAHARA_MAX_HW_DESC * sizeof(struct sahara_hw_desc),
1325 &dev->hw_phys_desc[0], GFP_KERNEL);
1326 if (!dev->hw_desc[0])
1327 return -ENOMEM;
1328 dev->hw_desc[1] = dev->hw_desc[0] + 1;
1329 dev->hw_phys_desc[1] = dev->hw_phys_desc[0] +
1330 sizeof(struct sahara_hw_desc);
1331
1332 /* Allocate space for iv and key */
1333 dev->key_base = dmam_alloc_coherent(&pdev->dev, 2 * AES_KEYSIZE_128,
1334 &dev->key_phys_base, GFP_KERNEL);
1335 if (!dev->key_base)
1336 return -ENOMEM;
1337 dev->iv_base = dev->key_base + AES_KEYSIZE_128;
1338 dev->iv_phys_base = dev->key_phys_base + AES_KEYSIZE_128;
1339
1340 /* Allocate space for context: largest digest + message length field */
1341 dev->context_base = dmam_alloc_coherent(&pdev->dev,
1342 SHA256_DIGEST_SIZE + 4,
1343 &dev->context_phys_base, GFP_KERNEL);
1344 if (!dev->context_base)
1345 return -ENOMEM;
1346
1347 /* Allocate space for HW links */
1348 dev->hw_link[0] = dmam_alloc_coherent(&pdev->dev,
1349 SAHARA_MAX_HW_LINK * sizeof(struct sahara_hw_link),
1350 &dev->hw_phys_link[0], GFP_KERNEL);
1351 if (!dev->hw_link[0])
1352 return -ENOMEM;
1353 for (i = 1; i < SAHARA_MAX_HW_LINK; i++) {
1354 dev->hw_phys_link[i] = dev->hw_phys_link[i - 1] +
1355 sizeof(struct sahara_hw_link);
1356 dev->hw_link[i] = dev->hw_link[i - 1] + 1;
1357 }
1358
1359 dev_ptr = dev;
1360
1361 dev->engine = crypto_engine_alloc_init(&pdev->dev, true);
1362 if (!dev->engine)
1363 return -ENOMEM;
1364
1365 err = crypto_engine_start(dev->engine);
1366 if (err) {
1367 crypto_engine_exit(dev->engine);
1368 return dev_err_probe(&pdev->dev, err,
1369 "Could not start crypto engine\n");
1370 }
1371
1372 init_completion(&dev->dma_completion);
1373
1374 version = sahara_read(dev, SAHARA_REG_VERSION);
1375 if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx27-sahara")) {
1376 if (version != SAHARA_VERSION_3)
1377 err = -ENODEV;
1378 } else if (of_device_is_compatible(pdev->dev.of_node,
1379 "fsl,imx53-sahara")) {
1380 if (((version >> 8) & 0xff) != SAHARA_VERSION_4)
1381 err = -ENODEV;
1382 version = (version >> 8) & 0xff;
1383 }
1384 if (err == -ENODEV) {
1385 dev_err_probe(&pdev->dev, err,
1386 "SAHARA version %d not supported\n", version);
1387 goto err_algs;
1388 }
1389
1390 dev->version = version;
1391
1392 sahara_write(dev, SAHARA_CMD_RESET | SAHARA_CMD_MODE_BATCH,
1393 SAHARA_REG_CMD);
1394 sahara_write(dev, SAHARA_CONTROL_SET_THROTTLE(0) |
1395 SAHARA_CONTROL_SET_MAXBURST(8) |
1396 SAHARA_CONTROL_RNG_AUTORSD |
1397 SAHARA_CONTROL_ENABLE_INT,
1398 SAHARA_REG_CONTROL);
1399
1400 err = sahara_register_algs(dev);
1401 if (err)
1402 goto err_algs;
1403
1404 dev_info(&pdev->dev, "SAHARA version %d initialized\n", version);
1405
1406 return 0;
1407
1408 err_algs:
1409 crypto_engine_exit(dev->engine);
1410
1411 return err;
1412 }
1413
1414 static void sahara_remove(struct platform_device *pdev)
1415 {
1416 struct sahara_dev *dev = platform_get_drvdata(pdev);
1417
1418 crypto_engine_exit(dev->engine);
1419 sahara_unregister_algs(dev);
1420 }
1421
1422 static struct platform_driver sahara_driver = {
1423 .probe = sahara_probe,
1424 .remove = sahara_remove,
1425 .driver = {
1426 .name = SAHARA_NAME,
1427 .of_match_table = sahara_dt_ids,
1428 },
1429 };
1430
1431 module_platform_driver(sahara_driver);
1432
1433 MODULE_LICENSE("GPL");
1434 MODULE_AUTHOR("Javier Martin <javier.martin@vista-silicon.com>");
1435 MODULE_AUTHOR("Steffen Trumtrar <s.trumtrar@pengutronix.de>");
1436 MODULE_DESCRIPTION("SAHARA2 HW crypto accelerator");
Linux Kernel