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Commit | Line | Data |
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1 | /* | |
2 | * Cryptographic API. | |
3 | * | |
4 | * Support Blackfin CRC HW acceleration. | |
5 | * | |
6 | * Copyright 2012 Analog Devices Inc. | |
7 | * | |
8 | * Licensed under the GPL-2. | |
9 | */ | |
10 | ||
11 | #include <linux/err.h> | |
12 | #include <linux/device.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/irq.h> | |
19 | #include <linux/io.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/scatterlist.h> | |
22 | #include <linux/dma-mapping.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/unaligned/access_ok.h> | |
25 | #include <linux/crypto.h> | |
26 | #include <linux/cryptohash.h> | |
27 | #include <crypto/scatterwalk.h> | |
28 | #include <crypto/algapi.h> | |
29 | #include <crypto/hash.h> | |
30 | #include <crypto/internal/hash.h> | |
31 | ||
32 | #include <asm/blackfin.h> | |
33 | #include <asm/bfin_crc.h> | |
34 | #include <asm/dma.h> | |
35 | #include <asm/portmux.h> | |
36 | ||
37 | #define CRC_CCRYPTO_QUEUE_LENGTH 5 | |
38 | ||
39 | #define DRIVER_NAME "bfin-hmac-crc" | |
40 | #define CHKSUM_DIGEST_SIZE 4 | |
41 | #define CHKSUM_BLOCK_SIZE 1 | |
42 | ||
43 | #define CRC_MAX_DMA_DESC 100 | |
44 | ||
45 | #define CRC_CRYPTO_STATE_UPDATE 1 | |
46 | #define CRC_CRYPTO_STATE_FINALUPDATE 2 | |
47 | #define CRC_CRYPTO_STATE_FINISH 3 | |
48 | ||
49 | struct bfin_crypto_crc { | |
50 | struct list_head list; | |
51 | struct device *dev; | |
52 | spinlock_t lock; | |
53 | ||
54 | int irq; | |
55 | int dma_ch; | |
56 | u32 poly; | |
57 | volatile struct crc_register *regs; | |
58 | ||
59 | struct ahash_request *req; /* current request in operation */ | |
60 | struct dma_desc_array *sg_cpu; /* virt addr of sg dma descriptors */ | |
61 | dma_addr_t sg_dma; /* phy addr of sg dma descriptors */ | |
62 | u8 *sg_mid_buf; | |
63 | ||
64 | struct tasklet_struct done_task; | |
65 | struct crypto_queue queue; /* waiting requests */ | |
66 | ||
67 | u8 busy:1; /* crc device in operation flag */ | |
68 | }; | |
69 | ||
70 | static struct bfin_crypto_crc_list { | |
71 | struct list_head dev_list; | |
72 | spinlock_t lock; | |
73 | } crc_list; | |
74 | ||
75 | struct bfin_crypto_crc_reqctx { | |
76 | struct bfin_crypto_crc *crc; | |
77 | ||
78 | unsigned int total; /* total request bytes */ | |
79 | size_t sg_buflen; /* bytes for this update */ | |
80 | unsigned int sg_nents; | |
81 | struct scatterlist *sg; /* sg list head for this update*/ | |
82 | struct scatterlist bufsl[2]; /* chained sg list */ | |
83 | ||
84 | size_t bufnext_len; | |
85 | size_t buflast_len; | |
86 | u8 bufnext[CHKSUM_DIGEST_SIZE]; /* extra bytes for next udpate */ | |
87 | u8 buflast[CHKSUM_DIGEST_SIZE]; /* extra bytes from last udpate */ | |
88 | ||
89 | u8 flag; | |
90 | }; | |
91 | ||
92 | struct bfin_crypto_crc_ctx { | |
93 | struct bfin_crypto_crc *crc; | |
94 | u32 key; | |
95 | }; | |
96 | ||
97 | ||
98 | /* | |
99 | * derive number of elements in scatterlist | |
100 | */ | |
101 | static int sg_count(struct scatterlist *sg_list) | |
102 | { | |
103 | struct scatterlist *sg = sg_list; | |
104 | int sg_nents = 1; | |
105 | ||
106 | if (sg_list == NULL) | |
107 | return 0; | |
108 | ||
109 | while (!sg_is_last(sg)) { | |
110 | sg_nents++; | |
111 | sg = scatterwalk_sg_next(sg); | |
112 | } | |
113 | ||
114 | return sg_nents; | |
115 | } | |
116 | ||
117 | /* | |
118 | * get element in scatter list by given index | |
119 | */ | |
120 | static struct scatterlist *sg_get(struct scatterlist *sg_list, unsigned int nents, | |
121 | unsigned int index) | |
122 | { | |
123 | struct scatterlist *sg = NULL; | |
124 | int i; | |
125 | ||
126 | for_each_sg(sg_list, sg, nents, i) | |
127 | if (i == index) | |
128 | break; | |
129 | ||
130 | return sg; | |
131 | } | |
132 | ||
133 | static int bfin_crypto_crc_init_hw(struct bfin_crypto_crc *crc, u32 key) | |
134 | { | |
135 | crc->regs->datacntrld = 0; | |
136 | crc->regs->control = MODE_CALC_CRC << OPMODE_OFFSET; | |
137 | crc->regs->curresult = key; | |
138 | ||
139 | /* setup CRC interrupts */ | |
140 | crc->regs->status = CMPERRI | DCNTEXPI; | |
141 | crc->regs->intrenset = CMPERRI | DCNTEXPI; | |
142 | SSYNC(); | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | static int bfin_crypto_crc_init(struct ahash_request *req) | |
148 | { | |
149 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); | |
150 | struct bfin_crypto_crc_ctx *crc_ctx = crypto_ahash_ctx(tfm); | |
151 | struct bfin_crypto_crc_reqctx *ctx = ahash_request_ctx(req); | |
152 | struct bfin_crypto_crc *crc; | |
153 | ||
154 | dev_dbg(ctx->crc->dev, "crc_init\n"); | |
155 | spin_lock_bh(&crc_list.lock); | |
156 | list_for_each_entry(crc, &crc_list.dev_list, list) { | |
157 | crc_ctx->crc = crc; | |
158 | break; | |
159 | } | |
160 | spin_unlock_bh(&crc_list.lock); | |
161 | ||
162 | if (sg_count(req->src) > CRC_MAX_DMA_DESC) { | |
163 | dev_dbg(ctx->crc->dev, "init: requested sg list is too big > %d\n", | |
164 | CRC_MAX_DMA_DESC); | |
165 | return -EINVAL; | |
166 | } | |
167 | ||
168 | ctx->crc = crc; | |
169 | ctx->bufnext_len = 0; | |
170 | ctx->buflast_len = 0; | |
171 | ctx->sg_buflen = 0; | |
172 | ctx->total = 0; | |
173 | ctx->flag = 0; | |
174 | ||
175 | /* init crc results */ | |
176 | put_unaligned_le32(crc_ctx->key, req->result); | |
177 | ||
178 | dev_dbg(ctx->crc->dev, "init: digest size: %d\n", | |
179 | crypto_ahash_digestsize(tfm)); | |
180 | ||
181 | return bfin_crypto_crc_init_hw(crc, crc_ctx->key); | |
182 | } | |
183 | ||
184 | static void bfin_crypto_crc_config_dma(struct bfin_crypto_crc *crc) | |
185 | { | |
186 | struct scatterlist *sg; | |
187 | struct bfin_crypto_crc_reqctx *ctx = ahash_request_ctx(crc->req); | |
188 | int i = 0, j = 0; | |
189 | unsigned long dma_config; | |
190 | unsigned int dma_count; | |
191 | unsigned int dma_addr; | |
192 | unsigned int mid_dma_count = 0; | |
193 | int dma_mod; | |
194 | ||
195 | dma_map_sg(crc->dev, ctx->sg, ctx->sg_nents, DMA_TO_DEVICE); | |
196 | ||
197 | for_each_sg(ctx->sg, sg, ctx->sg_nents, j) { | |
198 | dma_config = DMAFLOW_ARRAY | RESTART | NDSIZE_3 | DMAEN | PSIZE_32; | |
199 | dma_addr = sg_dma_address(sg); | |
200 | /* deduce extra bytes in last sg */ | |
201 | if (sg_is_last(sg)) | |
202 | dma_count = sg_dma_len(sg) - ctx->bufnext_len; | |
203 | else | |
204 | dma_count = sg_dma_len(sg); | |
205 | ||
206 | if (mid_dma_count) { | |
207 | /* Append last middle dma buffer to 4 bytes with first | |
208 | bytes in current sg buffer. Move addr of current | |
209 | sg and deduce the length of current sg. | |
210 | */ | |
211 | memcpy(crc->sg_mid_buf +((i-1) << 2) + mid_dma_count, | |
212 | (void *)dma_addr, | |
213 | CHKSUM_DIGEST_SIZE - mid_dma_count); | |
214 | dma_addr += CHKSUM_DIGEST_SIZE - mid_dma_count; | |
215 | dma_count -= CHKSUM_DIGEST_SIZE - mid_dma_count; | |
216 | } | |
217 | /* chop current sg dma len to multiple of 32 bits */ | |
218 | mid_dma_count = dma_count % 4; | |
219 | dma_count &= ~0x3; | |
220 | ||
221 | if (dma_addr % 4 == 0) { | |
222 | dma_config |= WDSIZE_32; | |
223 | dma_count >>= 2; | |
224 | dma_mod = 4; | |
225 | } else if (dma_addr % 2 == 0) { | |
226 | dma_config |= WDSIZE_16; | |
227 | dma_count >>= 1; | |
228 | dma_mod = 2; | |
229 | } else { | |
230 | dma_config |= WDSIZE_8; | |
231 | dma_mod = 1; | |
232 | } | |
233 | ||
234 | crc->sg_cpu[i].start_addr = dma_addr; | |
235 | crc->sg_cpu[i].cfg = dma_config; | |
236 | crc->sg_cpu[i].x_count = dma_count; | |
237 | crc->sg_cpu[i].x_modify = dma_mod; | |
238 | dev_dbg(crc->dev, "%d: crc_dma: start_addr:0x%lx, " | |
239 | "cfg:0x%lx, x_count:0x%lx, x_modify:0x%lx\n", | |
240 | i, crc->sg_cpu[i].start_addr, | |
241 | crc->sg_cpu[i].cfg, crc->sg_cpu[i].x_count, | |
242 | crc->sg_cpu[i].x_modify); | |
243 | i++; | |
244 | ||
245 | if (mid_dma_count) { | |
246 | /* copy extra bytes to next middle dma buffer */ | |
247 | dma_config = DMAFLOW_ARRAY | RESTART | NDSIZE_3 | | |
248 | DMAEN | PSIZE_32 | WDSIZE_32; | |
249 | memcpy(crc->sg_mid_buf + (i << 2), | |
250 | (void *)(dma_addr + (dma_count << 2)), | |
251 | mid_dma_count); | |
252 | /* setup new dma descriptor for next middle dma */ | |
253 | crc->sg_cpu[i].start_addr = dma_map_single(crc->dev, | |
254 | crc->sg_mid_buf + (i << 2), | |
255 | CHKSUM_DIGEST_SIZE, DMA_TO_DEVICE); | |
256 | crc->sg_cpu[i].cfg = dma_config; | |
257 | crc->sg_cpu[i].x_count = 1; | |
258 | crc->sg_cpu[i].x_modify = CHKSUM_DIGEST_SIZE; | |
259 | dev_dbg(crc->dev, "%d: crc_dma: start_addr:0x%lx, " | |
260 | "cfg:0x%lx, x_count:0x%lx, x_modify:0x%lx\n", | |
261 | i, crc->sg_cpu[i].start_addr, | |
262 | crc->sg_cpu[i].cfg, crc->sg_cpu[i].x_count, | |
263 | crc->sg_cpu[i].x_modify); | |
264 | i++; | |
265 | } | |
266 | } | |
267 | ||
268 | dma_config = DMAFLOW_ARRAY | RESTART | NDSIZE_3 | DMAEN | PSIZE_32 | WDSIZE_32; | |
269 | /* For final update req, append the buffer for next update as well*/ | |
270 | if (ctx->bufnext_len && (ctx->flag == CRC_CRYPTO_STATE_FINALUPDATE || | |
271 | ctx->flag == CRC_CRYPTO_STATE_FINISH)) { | |
272 | crc->sg_cpu[i].start_addr = dma_map_single(crc->dev, ctx->bufnext, | |
273 | CHKSUM_DIGEST_SIZE, DMA_TO_DEVICE); | |
274 | crc->sg_cpu[i].cfg = dma_config; | |
275 | crc->sg_cpu[i].x_count = 1; | |
276 | crc->sg_cpu[i].x_modify = CHKSUM_DIGEST_SIZE; | |
277 | dev_dbg(crc->dev, "%d: crc_dma: start_addr:0x%lx, " | |
278 | "cfg:0x%lx, x_count:0x%lx, x_modify:0x%lx\n", | |
279 | i, crc->sg_cpu[i].start_addr, | |
280 | crc->sg_cpu[i].cfg, crc->sg_cpu[i].x_count, | |
281 | crc->sg_cpu[i].x_modify); | |
282 | i++; | |
283 | } | |
284 | ||
285 | if (i == 0) | |
286 | return; | |
287 | ||
288 | flush_dcache_range((unsigned int)crc->sg_cpu, | |
289 | (unsigned int)crc->sg_cpu + | |
290 | i * sizeof(struct dma_desc_array)); | |
291 | ||
292 | /* Set the last descriptor to stop mode */ | |
293 | crc->sg_cpu[i - 1].cfg &= ~(DMAFLOW | NDSIZE); | |
294 | crc->sg_cpu[i - 1].cfg |= DI_EN; | |
295 | set_dma_curr_desc_addr(crc->dma_ch, (unsigned long *)crc->sg_dma); | |
296 | set_dma_x_count(crc->dma_ch, 0); | |
297 | set_dma_x_modify(crc->dma_ch, 0); | |
298 | SSYNC(); | |
299 | set_dma_config(crc->dma_ch, dma_config); | |
300 | } | |
301 | ||
302 | static int bfin_crypto_crc_handle_queue(struct bfin_crypto_crc *crc, | |
303 | struct ahash_request *req) | |
304 | { | |
305 | struct crypto_async_request *async_req, *backlog; | |
306 | struct bfin_crypto_crc_reqctx *ctx; | |
307 | struct scatterlist *sg; | |
308 | int ret = 0; | |
309 | int nsg, i, j; | |
310 | unsigned int nextlen; | |
311 | unsigned long flags; | |
312 | ||
313 | spin_lock_irqsave(&crc->lock, flags); | |
314 | if (req) | |
315 | ret = ahash_enqueue_request(&crc->queue, req); | |
316 | if (crc->busy) { | |
317 | spin_unlock_irqrestore(&crc->lock, flags); | |
318 | return ret; | |
319 | } | |
320 | backlog = crypto_get_backlog(&crc->queue); | |
321 | async_req = crypto_dequeue_request(&crc->queue); | |
322 | if (async_req) | |
323 | crc->busy = 1; | |
324 | spin_unlock_irqrestore(&crc->lock, flags); | |
325 | ||
326 | if (!async_req) | |
327 | return ret; | |
328 | ||
329 | if (backlog) | |
330 | backlog->complete(backlog, -EINPROGRESS); | |
331 | ||
332 | req = ahash_request_cast(async_req); | |
333 | crc->req = req; | |
334 | ctx = ahash_request_ctx(req); | |
335 | ctx->sg = NULL; | |
336 | ctx->sg_buflen = 0; | |
337 | ctx->sg_nents = 0; | |
338 | ||
339 | dev_dbg(crc->dev, "handling new req, flag=%u, nbytes: %d\n", | |
340 | ctx->flag, req->nbytes); | |
341 | ||
342 | if (ctx->flag == CRC_CRYPTO_STATE_FINISH) { | |
343 | if (ctx->bufnext_len == 0) { | |
344 | crc->busy = 0; | |
345 | return 0; | |
346 | } | |
347 | ||
348 | /* Pack last crc update buffer to 32bit */ | |
349 | memset(ctx->bufnext + ctx->bufnext_len, 0, | |
350 | CHKSUM_DIGEST_SIZE - ctx->bufnext_len); | |
351 | } else { | |
352 | /* Pack small data which is less than 32bit to buffer for next update. */ | |
353 | if (ctx->bufnext_len + req->nbytes < CHKSUM_DIGEST_SIZE) { | |
354 | memcpy(ctx->bufnext + ctx->bufnext_len, | |
355 | sg_virt(req->src), req->nbytes); | |
356 | ctx->bufnext_len += req->nbytes; | |
357 | if (ctx->flag == CRC_CRYPTO_STATE_FINALUPDATE && | |
358 | ctx->bufnext_len) { | |
359 | goto finish_update; | |
360 | } else { | |
361 | crc->busy = 0; | |
362 | return 0; | |
363 | } | |
364 | } | |
365 | ||
366 | if (ctx->bufnext_len) { | |
367 | /* Chain in extra bytes of last update */ | |
368 | ctx->buflast_len = ctx->bufnext_len; | |
369 | memcpy(ctx->buflast, ctx->bufnext, ctx->buflast_len); | |
370 | ||
371 | nsg = ctx->sg_buflen ? 2 : 1; | |
372 | sg_init_table(ctx->bufsl, nsg); | |
373 | sg_set_buf(ctx->bufsl, ctx->buflast, ctx->buflast_len); | |
374 | if (nsg > 1) | |
375 | scatterwalk_sg_chain(ctx->bufsl, nsg, | |
376 | req->src); | |
377 | ctx->sg = ctx->bufsl; | |
378 | } else | |
379 | ctx->sg = req->src; | |
380 | ||
381 | /* Chop crc buffer size to multiple of 32 bit */ | |
382 | nsg = ctx->sg_nents = sg_count(ctx->sg); | |
383 | ctx->sg_buflen = ctx->buflast_len + req->nbytes; | |
384 | ctx->bufnext_len = ctx->sg_buflen % 4; | |
385 | ctx->sg_buflen &= ~0x3; | |
386 | ||
387 | if (ctx->bufnext_len) { | |
388 | /* copy extra bytes to buffer for next update */ | |
389 | memset(ctx->bufnext, 0, CHKSUM_DIGEST_SIZE); | |
390 | nextlen = ctx->bufnext_len; | |
391 | for (i = nsg - 1; i >= 0; i--) { | |
392 | sg = sg_get(ctx->sg, nsg, i); | |
393 | j = min(nextlen, sg_dma_len(sg)); | |
394 | memcpy(ctx->bufnext + nextlen - j, | |
395 | sg_virt(sg) + sg_dma_len(sg) - j, j); | |
396 | if (j == sg_dma_len(sg)) | |
397 | ctx->sg_nents--; | |
398 | nextlen -= j; | |
399 | if (nextlen == 0) | |
400 | break; | |
401 | } | |
402 | } | |
403 | } | |
404 | ||
405 | finish_update: | |
406 | if (ctx->bufnext_len && (ctx->flag == CRC_CRYPTO_STATE_FINALUPDATE || | |
407 | ctx->flag == CRC_CRYPTO_STATE_FINISH)) | |
408 | ctx->sg_buflen += CHKSUM_DIGEST_SIZE; | |
409 | ||
410 | /* set CRC data count before start DMA */ | |
411 | crc->regs->datacnt = ctx->sg_buflen >> 2; | |
412 | ||
413 | /* setup and enable CRC DMA */ | |
414 | bfin_crypto_crc_config_dma(crc); | |
415 | ||
416 | /* finally kick off CRC operation */ | |
417 | crc->regs->control |= BLKEN; | |
418 | SSYNC(); | |
419 | ||
420 | return -EINPROGRESS; | |
421 | } | |
422 | ||
423 | static int bfin_crypto_crc_update(struct ahash_request *req) | |
424 | { | |
425 | struct bfin_crypto_crc_reqctx *ctx = ahash_request_ctx(req); | |
426 | ||
427 | if (!req->nbytes) | |
428 | return 0; | |
429 | ||
430 | dev_dbg(ctx->crc->dev, "crc_update\n"); | |
431 | ctx->total += req->nbytes; | |
432 | ctx->flag = CRC_CRYPTO_STATE_UPDATE; | |
433 | ||
434 | return bfin_crypto_crc_handle_queue(ctx->crc, req); | |
435 | } | |
436 | ||
437 | static int bfin_crypto_crc_final(struct ahash_request *req) | |
438 | { | |
439 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); | |
440 | struct bfin_crypto_crc_ctx *crc_ctx = crypto_ahash_ctx(tfm); | |
441 | struct bfin_crypto_crc_reqctx *ctx = ahash_request_ctx(req); | |
442 | ||
443 | dev_dbg(ctx->crc->dev, "crc_final\n"); | |
444 | ctx->flag = CRC_CRYPTO_STATE_FINISH; | |
445 | crc_ctx->key = 0; | |
446 | ||
447 | return bfin_crypto_crc_handle_queue(ctx->crc, req); | |
448 | } | |
449 | ||
450 | static int bfin_crypto_crc_finup(struct ahash_request *req) | |
451 | { | |
452 | struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); | |
453 | struct bfin_crypto_crc_ctx *crc_ctx = crypto_ahash_ctx(tfm); | |
454 | struct bfin_crypto_crc_reqctx *ctx = ahash_request_ctx(req); | |
455 | ||
456 | dev_dbg(ctx->crc->dev, "crc_finishupdate\n"); | |
457 | ctx->total += req->nbytes; | |
458 | ctx->flag = CRC_CRYPTO_STATE_FINALUPDATE; | |
459 | crc_ctx->key = 0; | |
460 | ||
461 | return bfin_crypto_crc_handle_queue(ctx->crc, req); | |
462 | } | |
463 | ||
464 | static int bfin_crypto_crc_digest(struct ahash_request *req) | |
465 | { | |
466 | int ret; | |
467 | ||
468 | ret = bfin_crypto_crc_init(req); | |
469 | if (ret) | |
470 | return ret; | |
471 | ||
472 | return bfin_crypto_crc_finup(req); | |
473 | } | |
474 | ||
475 | static int bfin_crypto_crc_setkey(struct crypto_ahash *tfm, const u8 *key, | |
476 | unsigned int keylen) | |
477 | { | |
478 | struct bfin_crypto_crc_ctx *crc_ctx = crypto_ahash_ctx(tfm); | |
479 | ||
480 | dev_dbg(crc_ctx->crc->dev, "crc_setkey\n"); | |
481 | if (keylen != CHKSUM_DIGEST_SIZE) { | |
482 | crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
483 | return -EINVAL; | |
484 | } | |
485 | ||
486 | crc_ctx->key = get_unaligned_le32(key); | |
487 | ||
488 | return 0; | |
489 | } | |
490 | ||
491 | static int bfin_crypto_crc_cra_init(struct crypto_tfm *tfm) | |
492 | { | |
493 | struct bfin_crypto_crc_ctx *crc_ctx = crypto_tfm_ctx(tfm); | |
494 | ||
495 | crc_ctx->key = 0; | |
496 | crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm), | |
497 | sizeof(struct bfin_crypto_crc_reqctx)); | |
498 | ||
499 | return 0; | |
500 | } | |
501 | ||
502 | static void bfin_crypto_crc_cra_exit(struct crypto_tfm *tfm) | |
503 | { | |
504 | } | |
505 | ||
506 | static struct ahash_alg algs = { | |
507 | .init = bfin_crypto_crc_init, | |
508 | .update = bfin_crypto_crc_update, | |
509 | .final = bfin_crypto_crc_final, | |
510 | .finup = bfin_crypto_crc_finup, | |
511 | .digest = bfin_crypto_crc_digest, | |
512 | .setkey = bfin_crypto_crc_setkey, | |
513 | .halg.digestsize = CHKSUM_DIGEST_SIZE, | |
514 | .halg.base = { | |
515 | .cra_name = "hmac(crc32)", | |
516 | .cra_driver_name = DRIVER_NAME, | |
517 | .cra_priority = 100, | |
518 | .cra_flags = CRYPTO_ALG_TYPE_AHASH | | |
519 | CRYPTO_ALG_ASYNC, | |
520 | .cra_blocksize = CHKSUM_BLOCK_SIZE, | |
521 | .cra_ctxsize = sizeof(struct bfin_crypto_crc_ctx), | |
522 | .cra_alignmask = 3, | |
523 | .cra_module = THIS_MODULE, | |
524 | .cra_init = bfin_crypto_crc_cra_init, | |
525 | .cra_exit = bfin_crypto_crc_cra_exit, | |
526 | } | |
527 | }; | |
528 | ||
529 | static void bfin_crypto_crc_done_task(unsigned long data) | |
530 | { | |
531 | struct bfin_crypto_crc *crc = (struct bfin_crypto_crc *)data; | |
532 | ||
533 | bfin_crypto_crc_handle_queue(crc, NULL); | |
534 | } | |
535 | ||
536 | static irqreturn_t bfin_crypto_crc_handler(int irq, void *dev_id) | |
537 | { | |
538 | struct bfin_crypto_crc *crc = dev_id; | |
539 | ||
540 | if (crc->regs->status & DCNTEXP) { | |
541 | crc->regs->status = DCNTEXP; | |
542 | SSYNC(); | |
543 | ||
544 | /* prepare results */ | |
545 | put_unaligned_le32(crc->regs->result, crc->req->result); | |
546 | ||
547 | crc->regs->control &= ~BLKEN; | |
548 | crc->busy = 0; | |
549 | ||
550 | if (crc->req->base.complete) | |
551 | crc->req->base.complete(&crc->req->base, 0); | |
552 | ||
553 | tasklet_schedule(&crc->done_task); | |
554 | ||
555 | return IRQ_HANDLED; | |
556 | } else | |
557 | return IRQ_NONE; | |
558 | } | |
559 | ||
560 | #ifdef CONFIG_PM | |
561 | /** | |
562 | * bfin_crypto_crc_suspend - suspend crc device | |
563 | * @pdev: device being suspended | |
564 | * @state: requested suspend state | |
565 | */ | |
566 | static int bfin_crypto_crc_suspend(struct platform_device *pdev, pm_message_t state) | |
567 | { | |
568 | struct bfin_crypto_crc *crc = platform_get_drvdata(pdev); | |
569 | int i = 100000; | |
570 | ||
571 | while ((crc->regs->control & BLKEN) && --i) | |
572 | cpu_relax(); | |
573 | ||
574 | if (i == 0) | |
575 | return -EBUSY; | |
576 | ||
577 | return 0; | |
578 | } | |
579 | #else | |
580 | # define bfin_crypto_crc_suspend NULL | |
581 | #endif | |
582 | ||
583 | #define bfin_crypto_crc_resume NULL | |
584 | ||
585 | /** | |
586 | * bfin_crypto_crc_probe - Initialize module | |
587 | * | |
588 | */ | |
589 | static int bfin_crypto_crc_probe(struct platform_device *pdev) | |
590 | { | |
591 | struct device *dev = &pdev->dev; | |
592 | struct resource *res; | |
593 | struct bfin_crypto_crc *crc; | |
594 | unsigned int timeout = 100000; | |
595 | int ret; | |
596 | ||
597 | crc = kzalloc(sizeof(*crc), GFP_KERNEL); | |
598 | if (!crc) { | |
599 | dev_err(&pdev->dev, "fail to malloc bfin_crypto_crc\n"); | |
600 | return -ENOMEM; | |
601 | } | |
602 | ||
603 | crc->dev = dev; | |
604 | ||
605 | INIT_LIST_HEAD(&crc->list); | |
606 | spin_lock_init(&crc->lock); | |
607 | tasklet_init(&crc->done_task, bfin_crypto_crc_done_task, (unsigned long)crc); | |
608 | crypto_init_queue(&crc->queue, CRC_CCRYPTO_QUEUE_LENGTH); | |
609 | ||
610 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
611 | if (res == NULL) { | |
612 | dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n"); | |
613 | ret = -ENOENT; | |
614 | goto out_error_free_mem; | |
615 | } | |
616 | ||
617 | crc->regs = ioremap(res->start, resource_size(res)); | |
618 | if (!crc->regs) { | |
619 | dev_err(&pdev->dev, "Cannot map CRC IO\n"); | |
620 | ret = -ENXIO; | |
621 | goto out_error_free_mem; | |
622 | } | |
623 | ||
624 | crc->irq = platform_get_irq(pdev, 0); | |
625 | if (crc->irq < 0) { | |
626 | dev_err(&pdev->dev, "No CRC DCNTEXP IRQ specified\n"); | |
627 | ret = -ENOENT; | |
628 | goto out_error_unmap; | |
629 | } | |
630 | ||
631 | ret = request_irq(crc->irq, bfin_crypto_crc_handler, IRQF_SHARED, dev_name(dev), crc); | |
632 | if (ret) { | |
633 | dev_err(&pdev->dev, "Unable to request blackfin crc irq\n"); | |
634 | goto out_error_unmap; | |
635 | } | |
636 | ||
637 | res = platform_get_resource(pdev, IORESOURCE_DMA, 0); | |
638 | if (res == NULL) { | |
639 | dev_err(&pdev->dev, "No CRC DMA channel specified\n"); | |
640 | ret = -ENOENT; | |
641 | goto out_error_irq; | |
642 | } | |
643 | crc->dma_ch = res->start; | |
644 | ||
645 | ret = request_dma(crc->dma_ch, dev_name(dev)); | |
646 | if (ret) { | |
647 | dev_err(&pdev->dev, "Unable to attach Blackfin CRC DMA channel\n"); | |
648 | goto out_error_irq; | |
649 | } | |
650 | ||
651 | crc->sg_cpu = dma_alloc_coherent(&pdev->dev, PAGE_SIZE, &crc->sg_dma, GFP_KERNEL); | |
652 | if (crc->sg_cpu == NULL) { | |
653 | ret = -ENOMEM; | |
654 | goto out_error_dma; | |
655 | } | |
656 | /* | |
657 | * need at most CRC_MAX_DMA_DESC sg + CRC_MAX_DMA_DESC middle + | |
658 | * 1 last + 1 next dma descriptors | |
659 | */ | |
660 | crc->sg_mid_buf = (u8 *)(crc->sg_cpu + ((CRC_MAX_DMA_DESC + 1) << 1)); | |
661 | ||
662 | crc->regs->control = 0; | |
663 | SSYNC(); | |
664 | crc->regs->poly = crc->poly = (u32)pdev->dev.platform_data; | |
665 | SSYNC(); | |
666 | ||
667 | while (!(crc->regs->status & LUTDONE) && (--timeout) > 0) | |
668 | cpu_relax(); | |
669 | ||
670 | if (timeout == 0) | |
671 | dev_info(&pdev->dev, "init crc poly timeout\n"); | |
672 | ||
673 | spin_lock(&crc_list.lock); | |
674 | list_add(&crc->list, &crc_list.dev_list); | |
675 | spin_unlock(&crc_list.lock); | |
676 | ||
677 | platform_set_drvdata(pdev, crc); | |
678 | ||
679 | ret = crypto_register_ahash(&algs); | |
680 | if (ret) { | |
681 | spin_lock(&crc_list.lock); | |
682 | list_del(&crc->list); | |
683 | spin_unlock(&crc_list.lock); | |
684 | dev_err(&pdev->dev, "Cann't register crypto ahash device\n"); | |
685 | goto out_error_dma; | |
686 | } | |
687 | ||
688 | dev_info(&pdev->dev, "initialized\n"); | |
689 | ||
690 | return 0; | |
691 | ||
692 | out_error_dma: | |
693 | if (crc->sg_cpu) | |
694 | dma_free_coherent(&pdev->dev, PAGE_SIZE, crc->sg_cpu, crc->sg_dma); | |
695 | free_dma(crc->dma_ch); | |
696 | out_error_irq: | |
697 | free_irq(crc->irq, crc); | |
698 | out_error_unmap: | |
699 | iounmap((void *)crc->regs); | |
700 | out_error_free_mem: | |
701 | kfree(crc); | |
702 | ||
703 | return ret; | |
704 | } | |
705 | ||
706 | /** | |
707 | * bfin_crypto_crc_remove - Initialize module | |
708 | * | |
709 | */ | |
710 | static int bfin_crypto_crc_remove(struct platform_device *pdev) | |
711 | { | |
712 | struct bfin_crypto_crc *crc = platform_get_drvdata(pdev); | |
713 | ||
714 | if (!crc) | |
715 | return -ENODEV; | |
716 | ||
717 | spin_lock(&crc_list.lock); | |
718 | list_del(&crc->list); | |
719 | spin_unlock(&crc_list.lock); | |
720 | ||
721 | crypto_unregister_ahash(&algs); | |
722 | tasklet_kill(&crc->done_task); | |
723 | free_dma(crc->dma_ch); | |
724 | if (crc->irq > 0) | |
725 | free_irq(crc->irq, crc); | |
726 | iounmap((void *)crc->regs); | |
727 | kfree(crc); | |
728 | ||
729 | return 0; | |
730 | } | |
731 | ||
732 | static struct platform_driver bfin_crypto_crc_driver = { | |
733 | .probe = bfin_crypto_crc_probe, | |
734 | .remove = bfin_crypto_crc_remove, | |
735 | .suspend = bfin_crypto_crc_suspend, | |
736 | .resume = bfin_crypto_crc_resume, | |
737 | .driver = { | |
738 | .name = DRIVER_NAME, | |
739 | .owner = THIS_MODULE, | |
740 | }, | |
741 | }; | |
742 | ||
743 | /** | |
744 | * bfin_crypto_crc_mod_init - Initialize module | |
745 | * | |
746 | * Checks the module params and registers the platform driver. | |
747 | * Real work is in the platform probe function. | |
748 | */ | |
749 | static int __init bfin_crypto_crc_mod_init(void) | |
750 | { | |
751 | int ret; | |
752 | ||
753 | pr_info("Blackfin hardware CRC crypto driver\n"); | |
754 | ||
755 | INIT_LIST_HEAD(&crc_list.dev_list); | |
756 | spin_lock_init(&crc_list.lock); | |
757 | ||
758 | ret = platform_driver_register(&bfin_crypto_crc_driver); | |
759 | if (ret) { | |
760 | pr_info(KERN_ERR "unable to register driver\n"); | |
761 | return ret; | |
762 | } | |
763 | ||
764 | return 0; | |
765 | } | |
766 | ||
767 | /** | |
768 | * bfin_crypto_crc_mod_exit - Deinitialize module | |
769 | */ | |
770 | static void __exit bfin_crypto_crc_mod_exit(void) | |
771 | { | |
772 | platform_driver_unregister(&bfin_crypto_crc_driver); | |
773 | } | |
774 | ||
775 | module_init(bfin_crypto_crc_mod_init); | |
776 | module_exit(bfin_crypto_crc_mod_exit); | |
777 | ||
778 | MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>"); | |
779 | MODULE_DESCRIPTION("Blackfin CRC hardware crypto driver"); | |
780 | MODULE_LICENSE("GPL"); |