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hwmon: (adt7475) fan stall prevention
[linux/fpc-iii.git] / drivers / crypto / img-hash.c
blob9b07f3d88febff92cbd2e44527f513c2b3ec09ac
1 /*
2 * Copyright (c) 2014 Imagination Technologies
3 * Authors: Will Thomas, James Hartley
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as published
7 * by the Free Software Foundation.
8 *
9 * Interface structure taken from omap-sham driver
10 */
11
12 #include <linux/clk.h>
13 #include <linux/dmaengine.h>
14 #include <linux/interrupt.h>
15 #include <linux/io.h>
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/of_device.h>
19 #include <linux/platform_device.h>
20 #include <linux/scatterlist.h>
21
22 #include <crypto/internal/hash.h>
23 #include <crypto/md5.h>
24 #include <crypto/sha.h>
25
26 #define CR_RESET 0
27 #define CR_RESET_SET 1
28 #define CR_RESET_UNSET 0
29
30 #define CR_MESSAGE_LENGTH_H 0x4
31 #define CR_MESSAGE_LENGTH_L 0x8
32
33 #define CR_CONTROL 0xc
34 #define CR_CONTROL_BYTE_ORDER_3210 0
35 #define CR_CONTROL_BYTE_ORDER_0123 1
36 #define CR_CONTROL_BYTE_ORDER_2310 2
37 #define CR_CONTROL_BYTE_ORDER_1032 3
38 #define CR_CONTROL_BYTE_ORDER_SHIFT 8
39 #define CR_CONTROL_ALGO_MD5 0
40 #define CR_CONTROL_ALGO_SHA1 1
41 #define CR_CONTROL_ALGO_SHA224 2
42 #define CR_CONTROL_ALGO_SHA256 3
43
44 #define CR_INTSTAT 0x10
45 #define CR_INTENAB 0x14
46 #define CR_INTCLEAR 0x18
47 #define CR_INT_RESULTS_AVAILABLE BIT(0)
48 #define CR_INT_NEW_RESULTS_SET BIT(1)
49 #define CR_INT_RESULT_READ_ERR BIT(2)
50 #define CR_INT_MESSAGE_WRITE_ERROR BIT(3)
51 #define CR_INT_STATUS BIT(8)
52
53 #define CR_RESULT_QUEUE 0x1c
54 #define CR_RSD0 0x40
55 #define CR_CORE_REV 0x50
56 #define CR_CORE_DES1 0x60
57 #define CR_CORE_DES2 0x70
58
59 #define DRIVER_FLAGS_BUSY BIT(0)
60 #define DRIVER_FLAGS_FINAL BIT(1)
61 #define DRIVER_FLAGS_DMA_ACTIVE BIT(2)
62 #define DRIVER_FLAGS_OUTPUT_READY BIT(3)
63 #define DRIVER_FLAGS_INIT BIT(4)
64 #define DRIVER_FLAGS_CPU BIT(5)
65 #define DRIVER_FLAGS_DMA_READY BIT(6)
66 #define DRIVER_FLAGS_ERROR BIT(7)
67 #define DRIVER_FLAGS_SG BIT(8)
68 #define DRIVER_FLAGS_SHA1 BIT(18)
69 #define DRIVER_FLAGS_SHA224 BIT(19)
70 #define DRIVER_FLAGS_SHA256 BIT(20)
71 #define DRIVER_FLAGS_MD5 BIT(21)
72
73 #define IMG_HASH_QUEUE_LENGTH 20
74 #define IMG_HASH_DMA_BURST 4
75 #define IMG_HASH_DMA_THRESHOLD 64
76
77 #ifdef __LITTLE_ENDIAN
78 #define IMG_HASH_BYTE_ORDER CR_CONTROL_BYTE_ORDER_3210
79 #else
80 #define IMG_HASH_BYTE_ORDER CR_CONTROL_BYTE_ORDER_0123
81 #endif
82
83 struct img_hash_dev;
84
85 struct img_hash_request_ctx {
86 struct img_hash_dev *hdev;
87 u8 digest[SHA256_DIGEST_SIZE] __aligned(sizeof(u32));
88 unsigned long flags;
89 size_t digsize;
90
91 dma_addr_t dma_addr;
92 size_t dma_ct;
93
94 /* sg root */
95 struct scatterlist *sgfirst;
96 /* walk state */
97 struct scatterlist *sg;
98 size_t nents;
99 size_t offset;
100 unsigned int total;
101 size_t sent;
102
103 unsigned long op;
104
105 size_t bufcnt;
106 struct ahash_request fallback_req;
107
108 /* Zero length buffer must remain last member of struct */
109 u8 buffer[0] __aligned(sizeof(u32));
110 };
111
112 struct img_hash_ctx {
113 struct img_hash_dev *hdev;
114 unsigned long flags;
115 struct crypto_ahash *fallback;
116 };
117
118 struct img_hash_dev {
119 struct list_head list;
120 struct device *dev;
121 struct clk *hash_clk;
122 struct clk *sys_clk;
123 void __iomem *io_base;
124
125 phys_addr_t bus_addr;
126 void __iomem *cpu_addr;
127
128 spinlock_t lock;
129 int err;
130 struct tasklet_struct done_task;
131 struct tasklet_struct dma_task;
132
133 unsigned long flags;
134 struct crypto_queue queue;
135 struct ahash_request *req;
136
137 struct dma_chan *dma_lch;
138 };
139
140 struct img_hash_drv {
141 struct list_head dev_list;
142 spinlock_t lock;
143 };
144
145 static struct img_hash_drv img_hash = {
146 .dev_list = LIST_HEAD_INIT(img_hash.dev_list),
147 .lock = __SPIN_LOCK_UNLOCKED(img_hash.lock),
148 };
149
150 static inline u32 img_hash_read(struct img_hash_dev *hdev, u32 offset)
151 {
152 return readl_relaxed(hdev->io_base + offset);
153 }
154
155 static inline void img_hash_write(struct img_hash_dev *hdev,
156 u32 offset, u32 value)
157 {
158 writel_relaxed(value, hdev->io_base + offset);
159 }
160
161 static inline u32 img_hash_read_result_queue(struct img_hash_dev *hdev)
162 {
163 return be32_to_cpu(img_hash_read(hdev, CR_RESULT_QUEUE));
164 }
165
166 static void img_hash_start(struct img_hash_dev *hdev, bool dma)
167 {
168 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
169 u32 cr = IMG_HASH_BYTE_ORDER << CR_CONTROL_BYTE_ORDER_SHIFT;
170
171 if (ctx->flags & DRIVER_FLAGS_MD5)
172 cr |= CR_CONTROL_ALGO_MD5;
173 else if (ctx->flags & DRIVER_FLAGS_SHA1)
174 cr |= CR_CONTROL_ALGO_SHA1;
175 else if (ctx->flags & DRIVER_FLAGS_SHA224)
176 cr |= CR_CONTROL_ALGO_SHA224;
177 else if (ctx->flags & DRIVER_FLAGS_SHA256)
178 cr |= CR_CONTROL_ALGO_SHA256;
179 dev_dbg(hdev->dev, "Starting hash process\n");
180 img_hash_write(hdev, CR_CONTROL, cr);
181
182 /*
183 * The hardware block requires two cycles between writing the control
184 * register and writing the first word of data in non DMA mode, to
185 * ensure the first data write is not grouped in burst with the control
186 * register write a read is issued to 'flush' the bus.
187 */
188 if (!dma)
189 img_hash_read(hdev, CR_CONTROL);
190 }
191
192 static int img_hash_xmit_cpu(struct img_hash_dev *hdev, const u8 *buf,
193 size_t length, int final)
194 {
195 u32 count, len32;
196 const u32 *buffer = (const u32 *)buf;
197
198 dev_dbg(hdev->dev, "xmit_cpu: length: %zu bytes\n", length);
199
200 if (final)
201 hdev->flags |= DRIVER_FLAGS_FINAL;
202
203 len32 = DIV_ROUND_UP(length, sizeof(u32));
204
205 for (count = 0; count < len32; count++)
206 writel_relaxed(buffer[count], hdev->cpu_addr);
207
208 return -EINPROGRESS;
209 }
210
211 static void img_hash_dma_callback(void *data)
212 {
213 struct img_hash_dev *hdev = (struct img_hash_dev *)data;
214 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
215
216 if (ctx->bufcnt) {
217 img_hash_xmit_cpu(hdev, ctx->buffer, ctx->bufcnt, 0);
218 ctx->bufcnt = 0;
219 }
220 if (ctx->sg)
221 tasklet_schedule(&hdev->dma_task);
222 }
223
224 static int img_hash_xmit_dma(struct img_hash_dev *hdev, struct scatterlist *sg)
225 {
226 struct dma_async_tx_descriptor *desc;
227 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
228
229 ctx->dma_ct = dma_map_sg(hdev->dev, sg, 1, DMA_TO_DEVICE);
230 if (ctx->dma_ct == 0) {
231 dev_err(hdev->dev, "Invalid DMA sg\n");
232 hdev->err = -EINVAL;
233 return -EINVAL;
234 }
235
236 desc = dmaengine_prep_slave_sg(hdev->dma_lch,
237 sg,
238 ctx->dma_ct,
239 DMA_MEM_TO_DEV,
240 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
241 if (!desc) {
242 dev_err(hdev->dev, "Null DMA descriptor\n");
243 hdev->err = -EINVAL;
244 dma_unmap_sg(hdev->dev, sg, 1, DMA_TO_DEVICE);
245 return -EINVAL;
246 }
247 desc->callback = img_hash_dma_callback;
248 desc->callback_param = hdev;
249 dmaengine_submit(desc);
250 dma_async_issue_pending(hdev->dma_lch);
251
252 return 0;
253 }
254
255 static int img_hash_write_via_cpu(struct img_hash_dev *hdev)
256 {
257 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
258
259 ctx->bufcnt = sg_copy_to_buffer(hdev->req->src, sg_nents(ctx->sg),
260 ctx->buffer, hdev->req->nbytes);
261
262 ctx->total = hdev->req->nbytes;
263 ctx->bufcnt = 0;
264
265 hdev->flags |= (DRIVER_FLAGS_CPU | DRIVER_FLAGS_FINAL);
266
267 img_hash_start(hdev, false);
268
269 return img_hash_xmit_cpu(hdev, ctx->buffer, ctx->total, 1);
270 }
271
272 static int img_hash_finish(struct ahash_request *req)
273 {
274 struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
275
276 if (!req->result)
277 return -EINVAL;
278
279 memcpy(req->result, ctx->digest, ctx->digsize);
280
281 return 0;
282 }
283
284 static void img_hash_copy_hash(struct ahash_request *req)
285 {
286 struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
287 u32 *hash = (u32 *)ctx->digest;
288 int i;
289
290 for (i = (ctx->digsize / sizeof(u32)) - 1; i >= 0; i--)
291 hash[i] = img_hash_read_result_queue(ctx->hdev);
292 }
293
294 static void img_hash_finish_req(struct ahash_request *req, int err)
295 {
296 struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
297 struct img_hash_dev *hdev = ctx->hdev;
298
299 if (!err) {
300 img_hash_copy_hash(req);
301 if (DRIVER_FLAGS_FINAL & hdev->flags)
302 err = img_hash_finish(req);
303 } else {
304 dev_warn(hdev->dev, "Hash failed with error %d\n", err);
305 ctx->flags |= DRIVER_FLAGS_ERROR;
306 }
307
308 hdev->flags &= ~(DRIVER_FLAGS_DMA_READY | DRIVER_FLAGS_OUTPUT_READY |
309 DRIVER_FLAGS_CPU | DRIVER_FLAGS_BUSY | DRIVER_FLAGS_FINAL);
310
311 if (req->base.complete)
312 req->base.complete(&req->base, err);
313 }
314
315 static int img_hash_write_via_dma(struct img_hash_dev *hdev)
316 {
317 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
318
319 img_hash_start(hdev, true);
320
321 dev_dbg(hdev->dev, "xmit dma size: %d\n", ctx->total);
322
323 if (!ctx->total)
324 hdev->flags |= DRIVER_FLAGS_FINAL;
325
326 hdev->flags |= DRIVER_FLAGS_DMA_ACTIVE | DRIVER_FLAGS_FINAL;
327
328 tasklet_schedule(&hdev->dma_task);
329
330 return -EINPROGRESS;
331 }
332
333 static int img_hash_dma_init(struct img_hash_dev *hdev)
334 {
335 struct dma_slave_config dma_conf;
336 int err = -EINVAL;
337
338 hdev->dma_lch = dma_request_slave_channel(hdev->dev, "tx");
339 if (!hdev->dma_lch) {
340 dev_err(hdev->dev, "Couldn't acquire a slave DMA channel.\n");
341 return -EBUSY;
342 }
343 dma_conf.direction = DMA_MEM_TO_DEV;
344 dma_conf.dst_addr = hdev->bus_addr;
345 dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
346 dma_conf.dst_maxburst = IMG_HASH_DMA_BURST;
347 dma_conf.device_fc = false;
348
349 err = dmaengine_slave_config(hdev->dma_lch, &dma_conf);
350 if (err) {
351 dev_err(hdev->dev, "Couldn't configure DMA slave.\n");
352 dma_release_channel(hdev->dma_lch);
353 return err;
354 }
355
356 return 0;
357 }
358
359 static void img_hash_dma_task(unsigned long d)
360 {
361 struct img_hash_dev *hdev = (struct img_hash_dev *)d;
362 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
363 u8 *addr;
364 size_t nbytes, bleft, wsend, len, tbc;
365 struct scatterlist tsg;
366
367 if (!hdev->req || !ctx->sg)
368 return;
369
370 addr = sg_virt(ctx->sg);
371 nbytes = ctx->sg->length - ctx->offset;
372
373 /*
374 * The hash accelerator does not support a data valid mask. This means
375 * that if each dma (i.e. per page) is not a multiple of 4 bytes, the
376 * padding bytes in the last word written by that dma would erroneously
377 * be included in the hash. To avoid this we round down the transfer,
378 * and add the excess to the start of the next dma. It does not matter
379 * that the final dma may not be a multiple of 4 bytes as the hashing
380 * block is programmed to accept the correct number of bytes.
381 */
382
383 bleft = nbytes % 4;
384 wsend = (nbytes / 4);
385
386 if (wsend) {
387 sg_init_one(&tsg, addr + ctx->offset, wsend * 4);
388 if (img_hash_xmit_dma(hdev, &tsg)) {
389 dev_err(hdev->dev, "DMA failed, falling back to CPU");
390 ctx->flags |= DRIVER_FLAGS_CPU;
391 hdev->err = 0;
392 img_hash_xmit_cpu(hdev, addr + ctx->offset,
393 wsend * 4, 0);
394 ctx->sent += wsend * 4;
395 wsend = 0;
396 } else {
397 ctx->sent += wsend * 4;
398 }
399 }
400
401 if (bleft) {
402 ctx->bufcnt = sg_pcopy_to_buffer(ctx->sgfirst, ctx->nents,
403 ctx->buffer, bleft, ctx->sent);
404 tbc = 0;
405 ctx->sg = sg_next(ctx->sg);
406 while (ctx->sg && (ctx->bufcnt < 4)) {
407 len = ctx->sg->length;
408 if (likely(len > (4 - ctx->bufcnt)))
409 len = 4 - ctx->bufcnt;
410 tbc = sg_pcopy_to_buffer(ctx->sgfirst, ctx->nents,
411 ctx->buffer + ctx->bufcnt, len,
412 ctx->sent + ctx->bufcnt);
413 ctx->bufcnt += tbc;
414 if (tbc >= ctx->sg->length) {
415 ctx->sg = sg_next(ctx->sg);
416 tbc = 0;
417 }
418 }
419
420 ctx->sent += ctx->bufcnt;
421 ctx->offset = tbc;
422
423 if (!wsend)
424 img_hash_dma_callback(hdev);
425 } else {
426 ctx->offset = 0;
427 ctx->sg = sg_next(ctx->sg);
428 }
429 }
430
431 static int img_hash_write_via_dma_stop(struct img_hash_dev *hdev)
432 {
433 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
434
435 if (ctx->flags & DRIVER_FLAGS_SG)
436 dma_unmap_sg(hdev->dev, ctx->sg, ctx->dma_ct, DMA_TO_DEVICE);
437
438 return 0;
439 }
440
441 static int img_hash_process_data(struct img_hash_dev *hdev)
442 {
443 struct ahash_request *req = hdev->req;
444 struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
445 int err = 0;
446
447 ctx->bufcnt = 0;
448
449 if (req->nbytes >= IMG_HASH_DMA_THRESHOLD) {
450 dev_dbg(hdev->dev, "process data request(%d bytes) using DMA\n",
451 req->nbytes);
452 err = img_hash_write_via_dma(hdev);
453 } else {
454 dev_dbg(hdev->dev, "process data request(%d bytes) using CPU\n",
455 req->nbytes);
456 err = img_hash_write_via_cpu(hdev);
457 }
458 return err;
459 }
460
461 static int img_hash_hw_init(struct img_hash_dev *hdev)
462 {
463 unsigned long long nbits;
464 u32 u, l;
465
466 img_hash_write(hdev, CR_RESET, CR_RESET_SET);
467 img_hash_write(hdev, CR_RESET, CR_RESET_UNSET);
468 img_hash_write(hdev, CR_INTENAB, CR_INT_NEW_RESULTS_SET);
469
470 nbits = (u64)hdev->req->nbytes << 3;
471 u = nbits >> 32;
472 l = nbits;
473 img_hash_write(hdev, CR_MESSAGE_LENGTH_H, u);
474 img_hash_write(hdev, CR_MESSAGE_LENGTH_L, l);
475
476 if (!(DRIVER_FLAGS_INIT & hdev->flags)) {
477 hdev->flags |= DRIVER_FLAGS_INIT;
478 hdev->err = 0;
479 }
480 dev_dbg(hdev->dev, "hw initialized, nbits: %llx\n", nbits);
481 return 0;
482 }
483
484 static int img_hash_init(struct ahash_request *req)
485 {
486 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
487 struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
488 struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
489
490 ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
491 rctx->fallback_req.base.flags = req->base.flags
492 & CRYPTO_TFM_REQ_MAY_SLEEP;
493
494 return crypto_ahash_init(&rctx->fallback_req);
495 }
496
497 static int img_hash_handle_queue(struct img_hash_dev *hdev,
498 struct ahash_request *req)
499 {
500 struct crypto_async_request *async_req, *backlog;
501 struct img_hash_request_ctx *ctx;
502 unsigned long flags;
503 int err = 0, res = 0;
504
505 spin_lock_irqsave(&hdev->lock, flags);
506
507 if (req)
508 res = ahash_enqueue_request(&hdev->queue, req);
509
510 if (DRIVER_FLAGS_BUSY & hdev->flags) {
511 spin_unlock_irqrestore(&hdev->lock, flags);
512 return res;
513 }
514
515 backlog = crypto_get_backlog(&hdev->queue);
516 async_req = crypto_dequeue_request(&hdev->queue);
517 if (async_req)
518 hdev->flags |= DRIVER_FLAGS_BUSY;
519
520 spin_unlock_irqrestore(&hdev->lock, flags);
521
522 if (!async_req)
523 return res;
524
525 if (backlog)
526 backlog->complete(backlog, -EINPROGRESS);
527
528 req = ahash_request_cast(async_req);
529 hdev->req = req;
530
531 ctx = ahash_request_ctx(req);
532
533 dev_info(hdev->dev, "processing req, op: %lu, bytes: %d\n",
534 ctx->op, req->nbytes);
535
536 err = img_hash_hw_init(hdev);
537
538 if (!err)
539 err = img_hash_process_data(hdev);
540
541 if (err != -EINPROGRESS) {
542 /* done_task will not finish so do it here */
543 img_hash_finish_req(req, err);
544 }
545 return res;
546 }
547
548 static int img_hash_update(struct ahash_request *req)
549 {
550 struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
551 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
552 struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
553
554 ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
555 rctx->fallback_req.base.flags = req->base.flags
556 & CRYPTO_TFM_REQ_MAY_SLEEP;
557 rctx->fallback_req.nbytes = req->nbytes;
558 rctx->fallback_req.src = req->src;
559
560 return crypto_ahash_update(&rctx->fallback_req);
561 }
562
563 static int img_hash_final(struct ahash_request *req)
564 {
565 struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
566 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
567 struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
568
569 ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
570 rctx->fallback_req.base.flags = req->base.flags
571 & CRYPTO_TFM_REQ_MAY_SLEEP;
572 rctx->fallback_req.result = req->result;
573
574 return crypto_ahash_final(&rctx->fallback_req);
575 }
576
577 static int img_hash_finup(struct ahash_request *req)
578 {
579 struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
580 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
581 struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
582
583 ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
584 rctx->fallback_req.base.flags = req->base.flags
585 & CRYPTO_TFM_REQ_MAY_SLEEP;
586 rctx->fallback_req.nbytes = req->nbytes;
587 rctx->fallback_req.src = req->src;
588 rctx->fallback_req.result = req->result;
589
590 return crypto_ahash_finup(&rctx->fallback_req);
591 }
592
593 static int img_hash_import(struct ahash_request *req, const void *in)
594 {
595 struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
596 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
597 struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
598
599 ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
600 rctx->fallback_req.base.flags = req->base.flags
601 & CRYPTO_TFM_REQ_MAY_SLEEP;
602
603 return crypto_ahash_import(&rctx->fallback_req, in);
604 }
605
606 static int img_hash_export(struct ahash_request *req, void *out)
607 {
608 struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
609 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
610 struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
611
612 ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
613 rctx->fallback_req.base.flags = req->base.flags
614 & CRYPTO_TFM_REQ_MAY_SLEEP;
615
616 return crypto_ahash_export(&rctx->fallback_req, out);
617 }
618
619 static int img_hash_digest(struct ahash_request *req)
620 {
621 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
622 struct img_hash_ctx *tctx = crypto_ahash_ctx(tfm);
623 struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
624 struct img_hash_dev *hdev = NULL;
625 struct img_hash_dev *tmp;
626 int err;
627
628 spin_lock(&img_hash.lock);
629 if (!tctx->hdev) {
630 list_for_each_entry(tmp, &img_hash.dev_list, list) {
631 hdev = tmp;
632 break;
633 }
634 tctx->hdev = hdev;
635
636 } else {
637 hdev = tctx->hdev;
638 }
639
640 spin_unlock(&img_hash.lock);
641 ctx->hdev = hdev;
642 ctx->flags = 0;
643 ctx->digsize = crypto_ahash_digestsize(tfm);
644
645 switch (ctx->digsize) {
646 case SHA1_DIGEST_SIZE:
647 ctx->flags |= DRIVER_FLAGS_SHA1;
648 break;
649 case SHA256_DIGEST_SIZE:
650 ctx->flags |= DRIVER_FLAGS_SHA256;
651 break;
652 case SHA224_DIGEST_SIZE:
653 ctx->flags |= DRIVER_FLAGS_SHA224;
654 break;
655 case MD5_DIGEST_SIZE:
656 ctx->flags |= DRIVER_FLAGS_MD5;
657 break;
658 default:
659 return -EINVAL;
660 }
661
662 ctx->bufcnt = 0;
663 ctx->offset = 0;
664 ctx->sent = 0;
665 ctx->total = req->nbytes;
666 ctx->sg = req->src;
667 ctx->sgfirst = req->src;
668 ctx->nents = sg_nents(ctx->sg);
669
670 err = img_hash_handle_queue(tctx->hdev, req);
671
672 return err;
673 }
674
675 static int img_hash_cra_init(struct crypto_tfm *tfm, const char *alg_name)
676 {
677 struct img_hash_ctx *ctx = crypto_tfm_ctx(tfm);
678 int err = -ENOMEM;
679
680 ctx->fallback = crypto_alloc_ahash(alg_name, 0,
681 CRYPTO_ALG_NEED_FALLBACK);
682 if (IS_ERR(ctx->fallback)) {
683 pr_err("img_hash: Could not load fallback driver.\n");
684 err = PTR_ERR(ctx->fallback);
685 goto err;
686 }
687 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
688 sizeof(struct img_hash_request_ctx) +
689 crypto_ahash_reqsize(ctx->fallback) +
690 IMG_HASH_DMA_THRESHOLD);
691
692 return 0;
693
694 err:
695 return err;
696 }
697
698 static int img_hash_cra_md5_init(struct crypto_tfm *tfm)
699 {
700 return img_hash_cra_init(tfm, "md5-generic");
701 }
702
703 static int img_hash_cra_sha1_init(struct crypto_tfm *tfm)
704 {
705 return img_hash_cra_init(tfm, "sha1-generic");
706 }
707
708 static int img_hash_cra_sha224_init(struct crypto_tfm *tfm)
709 {
710 return img_hash_cra_init(tfm, "sha224-generic");
711 }
712
713 static int img_hash_cra_sha256_init(struct crypto_tfm *tfm)
714 {
715 return img_hash_cra_init(tfm, "sha256-generic");
716 }
717
718 static void img_hash_cra_exit(struct crypto_tfm *tfm)
719 {
720 struct img_hash_ctx *tctx = crypto_tfm_ctx(tfm);
721
722 crypto_free_ahash(tctx->fallback);
723 }
724
725 static irqreturn_t img_irq_handler(int irq, void *dev_id)
726 {
727 struct img_hash_dev *hdev = dev_id;
728 u32 reg;
729
730 reg = img_hash_read(hdev, CR_INTSTAT);
731 img_hash_write(hdev, CR_INTCLEAR, reg);
732
733 if (reg & CR_INT_NEW_RESULTS_SET) {
734 dev_dbg(hdev->dev, "IRQ CR_INT_NEW_RESULTS_SET\n");
735 if (DRIVER_FLAGS_BUSY & hdev->flags) {
736 hdev->flags |= DRIVER_FLAGS_OUTPUT_READY;
737 if (!(DRIVER_FLAGS_CPU & hdev->flags))
738 hdev->flags |= DRIVER_FLAGS_DMA_READY;
739 tasklet_schedule(&hdev->done_task);
740 } else {
741 dev_warn(hdev->dev,
742 "HASH interrupt when no active requests.\n");
743 }
744 } else if (reg & CR_INT_RESULTS_AVAILABLE) {
745 dev_warn(hdev->dev,
746 "IRQ triggered before the hash had completed\n");
747 } else if (reg & CR_INT_RESULT_READ_ERR) {
748 dev_warn(hdev->dev,
749 "Attempt to read from an empty result queue\n");
750 } else if (reg & CR_INT_MESSAGE_WRITE_ERROR) {
751 dev_warn(hdev->dev,
752 "Data written before the hardware was configured\n");
753 }
754 return IRQ_HANDLED;
755 }
756
757 static struct ahash_alg img_algs[] = {
758 {
759 .init = img_hash_init,
760 .update = img_hash_update,
761 .final = img_hash_final,
762 .finup = img_hash_finup,
763 .export = img_hash_export,
764 .import = img_hash_import,
765 .digest = img_hash_digest,
766 .halg = {
767 .digestsize = MD5_DIGEST_SIZE,
768 .statesize = sizeof(struct md5_state),
769 .base = {
770 .cra_name = "md5",
771 .cra_driver_name = "img-md5",
772 .cra_priority = 300,
773 .cra_flags =
774 CRYPTO_ALG_ASYNC |
775 CRYPTO_ALG_NEED_FALLBACK,
776 .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
777 .cra_ctxsize = sizeof(struct img_hash_ctx),
778 .cra_init = img_hash_cra_md5_init,
779 .cra_exit = img_hash_cra_exit,
780 .cra_module = THIS_MODULE,
781 }
782 }
783 },
784 {
785 .init = img_hash_init,
786 .update = img_hash_update,
787 .final = img_hash_final,
788 .finup = img_hash_finup,
789 .export = img_hash_export,
790 .import = img_hash_import,
791 .digest = img_hash_digest,
792 .halg = {
793 .digestsize = SHA1_DIGEST_SIZE,
794 .statesize = sizeof(struct sha1_state),
795 .base = {
796 .cra_name = "sha1",
797 .cra_driver_name = "img-sha1",
798 .cra_priority = 300,
799 .cra_flags =
800 CRYPTO_ALG_ASYNC |
801 CRYPTO_ALG_NEED_FALLBACK,
802 .cra_blocksize = SHA1_BLOCK_SIZE,
803 .cra_ctxsize = sizeof(struct img_hash_ctx),
804 .cra_init = img_hash_cra_sha1_init,
805 .cra_exit = img_hash_cra_exit,
806 .cra_module = THIS_MODULE,
807 }
808 }
809 },
810 {
811 .init = img_hash_init,
812 .update = img_hash_update,
813 .final = img_hash_final,
814 .finup = img_hash_finup,
815 .export = img_hash_export,
816 .import = img_hash_import,
817 .digest = img_hash_digest,
818 .halg = {
819 .digestsize = SHA224_DIGEST_SIZE,
820 .statesize = sizeof(struct sha256_state),
821 .base = {
822 .cra_name = "sha224",
823 .cra_driver_name = "img-sha224",
824 .cra_priority = 300,
825 .cra_flags =
826 CRYPTO_ALG_ASYNC |
827 CRYPTO_ALG_NEED_FALLBACK,
828 .cra_blocksize = SHA224_BLOCK_SIZE,
829 .cra_ctxsize = sizeof(struct img_hash_ctx),
830 .cra_init = img_hash_cra_sha224_init,
831 .cra_exit = img_hash_cra_exit,
832 .cra_module = THIS_MODULE,
833 }
834 }
835 },
836 {
837 .init = img_hash_init,
838 .update = img_hash_update,
839 .final = img_hash_final,
840 .finup = img_hash_finup,
841 .export = img_hash_export,
842 .import = img_hash_import,
843 .digest = img_hash_digest,
844 .halg = {
845 .digestsize = SHA256_DIGEST_SIZE,
846 .statesize = sizeof(struct sha256_state),
847 .base = {
848 .cra_name = "sha256",
849 .cra_driver_name = "img-sha256",
850 .cra_priority = 300,
851 .cra_flags =
852 CRYPTO_ALG_ASYNC |
853 CRYPTO_ALG_NEED_FALLBACK,
854 .cra_blocksize = SHA256_BLOCK_SIZE,
855 .cra_ctxsize = sizeof(struct img_hash_ctx),
856 .cra_init = img_hash_cra_sha256_init,
857 .cra_exit = img_hash_cra_exit,
858 .cra_module = THIS_MODULE,
859 }
860 }
861 }
862 };
863
864 static int img_register_algs(struct img_hash_dev *hdev)
865 {
866 int i, err;
867
868 for (i = 0; i < ARRAY_SIZE(img_algs); i++) {
869 err = crypto_register_ahash(&img_algs[i]);
870 if (err)
871 goto err_reg;
872 }
873 return 0;
874
875 err_reg:
876 for (; i--; )
877 crypto_unregister_ahash(&img_algs[i]);
878
879 return err;
880 }
881
882 static int img_unregister_algs(struct img_hash_dev *hdev)
883 {
884 int i;
885
886 for (i = 0; i < ARRAY_SIZE(img_algs); i++)
887 crypto_unregister_ahash(&img_algs[i]);
888 return 0;
889 }
890
891 static void img_hash_done_task(unsigned long data)
892 {
893 struct img_hash_dev *hdev = (struct img_hash_dev *)data;
894 int err = 0;
895
896 if (hdev->err == -EINVAL) {
897 err = hdev->err;
898 goto finish;
899 }
900
901 if (!(DRIVER_FLAGS_BUSY & hdev->flags)) {
902 img_hash_handle_queue(hdev, NULL);
903 return;
904 }
905
906 if (DRIVER_FLAGS_CPU & hdev->flags) {
907 if (DRIVER_FLAGS_OUTPUT_READY & hdev->flags) {
908 hdev->flags &= ~DRIVER_FLAGS_OUTPUT_READY;
909 goto finish;
910 }
911 } else if (DRIVER_FLAGS_DMA_READY & hdev->flags) {
912 if (DRIVER_FLAGS_DMA_ACTIVE & hdev->flags) {
913 hdev->flags &= ~DRIVER_FLAGS_DMA_ACTIVE;
914 img_hash_write_via_dma_stop(hdev);
915 if (hdev->err) {
916 err = hdev->err;
917 goto finish;
918 }
919 }
920 if (DRIVER_FLAGS_OUTPUT_READY & hdev->flags) {
921 hdev->flags &= ~(DRIVER_FLAGS_DMA_READY |
922 DRIVER_FLAGS_OUTPUT_READY);
923 goto finish;
924 }
925 }
926 return;
927
928 finish:
929 img_hash_finish_req(hdev->req, err);
930 }
931
932 static const struct of_device_id img_hash_match[] = {
933 { .compatible = "img,hash-accelerator" },
934 {}
935 };
936 MODULE_DEVICE_TABLE(of, img_hash_match);
937
938 static int img_hash_probe(struct platform_device *pdev)
939 {
940 struct img_hash_dev *hdev;
941 struct device *dev = &pdev->dev;
942 struct resource *hash_res;
943 int irq;
944 int err;
945
946 hdev = devm_kzalloc(dev, sizeof(*hdev), GFP_KERNEL);
947 if (hdev == NULL)
948 return -ENOMEM;
949
950 spin_lock_init(&hdev->lock);
951
952 hdev->dev = dev;
953
954 platform_set_drvdata(pdev, hdev);
955
956 INIT_LIST_HEAD(&hdev->list);
957
958 tasklet_init(&hdev->done_task, img_hash_done_task, (unsigned long)hdev);
959 tasklet_init(&hdev->dma_task, img_hash_dma_task, (unsigned long)hdev);
960
961 crypto_init_queue(&hdev->queue, IMG_HASH_QUEUE_LENGTH);
962
963 /* Register bank */
964 hash_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
965
966 hdev->io_base = devm_ioremap_resource(dev, hash_res);
967 if (IS_ERR(hdev->io_base)) {
968 err = PTR_ERR(hdev->io_base);
969 dev_err(dev, "can't ioremap, returned %d\n", err);
970
971 goto res_err;
972 }
973
974 /* Write port (DMA or CPU) */
975 hash_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
976 hdev->cpu_addr = devm_ioremap_resource(dev, hash_res);
977 if (IS_ERR(hdev->cpu_addr)) {
978 dev_err(dev, "can't ioremap write port\n");
979 err = PTR_ERR(hdev->cpu_addr);
980 goto res_err;
981 }
982 hdev->bus_addr = hash_res->start;
983
984 irq = platform_get_irq(pdev, 0);
985 if (irq < 0) {
986 dev_err(dev, "no IRQ resource info\n");
987 err = irq;
988 goto res_err;
989 }
990
991 err = devm_request_irq(dev, irq, img_irq_handler, 0,
992 dev_name(dev), hdev);
993 if (err) {
994 dev_err(dev, "unable to request irq\n");
995 goto res_err;
996 }
997 dev_dbg(dev, "using IRQ channel %d\n", irq);
998
999 hdev->hash_clk = devm_clk_get(&pdev->dev, "hash");
1000 if (IS_ERR(hdev->hash_clk)) {
1001 dev_err(dev, "clock initialization failed.\n");
1002 err = PTR_ERR(hdev->hash_clk);
1003 goto res_err;
1004 }
1005
1006 hdev->sys_clk = devm_clk_get(&pdev->dev, "sys");
1007 if (IS_ERR(hdev->sys_clk)) {
1008 dev_err(dev, "clock initialization failed.\n");
1009 err = PTR_ERR(hdev->sys_clk);
1010 goto res_err;
1011 }
1012
1013 err = clk_prepare_enable(hdev->hash_clk);
1014 if (err)
1015 goto res_err;
1016
1017 err = clk_prepare_enable(hdev->sys_clk);
1018 if (err)
1019 goto clk_err;
1020
1021 err = img_hash_dma_init(hdev);
1022 if (err)
1023 goto dma_err;
1024
1025 dev_dbg(dev, "using %s for DMA transfers\n",
1026 dma_chan_name(hdev->dma_lch));
1027
1028 spin_lock(&img_hash.lock);
1029 list_add_tail(&hdev->list, &img_hash.dev_list);
1030 spin_unlock(&img_hash.lock);
1031
1032 err = img_register_algs(hdev);
1033 if (err)
1034 goto err_algs;
1035 dev_info(dev, "Img MD5/SHA1/SHA224/SHA256 Hardware accelerator initialized\n");
1036
1037 return 0;
1038
1039 err_algs:
1040 spin_lock(&img_hash.lock);
1041 list_del(&hdev->list);
1042 spin_unlock(&img_hash.lock);
1043 dma_release_channel(hdev->dma_lch);
1044 dma_err:
1045 clk_disable_unprepare(hdev->sys_clk);
1046 clk_err:
1047 clk_disable_unprepare(hdev->hash_clk);
1048 res_err:
1049 tasklet_kill(&hdev->done_task);
1050 tasklet_kill(&hdev->dma_task);
1051
1052 return err;
1053 }
1054
1055 static int img_hash_remove(struct platform_device *pdev)
1056 {
1057 static struct img_hash_dev *hdev;
1058
1059 hdev = platform_get_drvdata(pdev);
1060 spin_lock(&img_hash.lock);
1061 list_del(&hdev->list);
1062 spin_unlock(&img_hash.lock);
1063
1064 img_unregister_algs(hdev);
1065
1066 tasklet_kill(&hdev->done_task);
1067 tasklet_kill(&hdev->dma_task);
1068
1069 dma_release_channel(hdev->dma_lch);
1070
1071 clk_disable_unprepare(hdev->hash_clk);
1072 clk_disable_unprepare(hdev->sys_clk);
1073
1074 return 0;
1075 }
1076
1077 #ifdef CONFIG_PM_SLEEP
1078 static int img_hash_suspend(struct device *dev)
1079 {
1080 struct img_hash_dev *hdev = dev_get_drvdata(dev);
1081
1082 clk_disable_unprepare(hdev->hash_clk);
1083 clk_disable_unprepare(hdev->sys_clk);
1084
1085 return 0;
1086 }
1087
1088 static int img_hash_resume(struct device *dev)
1089 {
1090 struct img_hash_dev *hdev = dev_get_drvdata(dev);
1091
1092 clk_prepare_enable(hdev->hash_clk);
1093 clk_prepare_enable(hdev->sys_clk);
1094
1095 return 0;
1096 }
1097 #endif /* CONFIG_PM_SLEEP */
1098
1099 static const struct dev_pm_ops img_hash_pm_ops = {
1100 SET_SYSTEM_SLEEP_PM_OPS(img_hash_suspend, img_hash_resume)
1101 };
1102
1103 static struct platform_driver img_hash_driver = {
1104 .probe = img_hash_probe,
1105 .remove = img_hash_remove,
1106 .driver = {
1107 .name = "img-hash-accelerator",
1108 .pm = &img_hash_pm_ops,
1109 .of_match_table = of_match_ptr(img_hash_match),
1110 }
1111 };
1112 module_platform_driver(img_hash_driver);
1113
1114 MODULE_LICENSE("GPL v2");
1115 MODULE_DESCRIPTION("Imgtec SHA1/224/256 & MD5 hw accelerator driver");
1116 MODULE_AUTHOR("Will Thomas.");
1117 MODULE_AUTHOR("James Hartley <james.hartley@imgtec.com>");
Linux with added FPC-III support