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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / crypto / img-hash.c
blob25d5227f74a1e29891125c108f9173de0066dd22
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2014 Imagination Technologies
4 * Authors: Will Thomas, James Hartley
5 *
6 * Interface structure taken from omap-sham driver
7 */
8
9 #include <linux/clk.h>
10 #include <linux/dmaengine.h>
11 #include <linux/interrupt.h>
12 #include <linux/io.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/of_device.h>
16 #include <linux/platform_device.h>
17 #include <linux/scatterlist.h>
18
19 #include <crypto/internal/hash.h>
20 #include <crypto/md5.h>
21 #include <crypto/sha.h>
22
23 #define CR_RESET 0
24 #define CR_RESET_SET 1
25 #define CR_RESET_UNSET 0
26
27 #define CR_MESSAGE_LENGTH_H 0x4
28 #define CR_MESSAGE_LENGTH_L 0x8
29
30 #define CR_CONTROL 0xc
31 #define CR_CONTROL_BYTE_ORDER_3210 0
32 #define CR_CONTROL_BYTE_ORDER_0123 1
33 #define CR_CONTROL_BYTE_ORDER_2310 2
34 #define CR_CONTROL_BYTE_ORDER_1032 3
35 #define CR_CONTROL_BYTE_ORDER_SHIFT 8
36 #define CR_CONTROL_ALGO_MD5 0
37 #define CR_CONTROL_ALGO_SHA1 1
38 #define CR_CONTROL_ALGO_SHA224 2
39 #define CR_CONTROL_ALGO_SHA256 3
40
41 #define CR_INTSTAT 0x10
42 #define CR_INTENAB 0x14
43 #define CR_INTCLEAR 0x18
44 #define CR_INT_RESULTS_AVAILABLE BIT(0)
45 #define CR_INT_NEW_RESULTS_SET BIT(1)
46 #define CR_INT_RESULT_READ_ERR BIT(2)
47 #define CR_INT_MESSAGE_WRITE_ERROR BIT(3)
48 #define CR_INT_STATUS BIT(8)
49
50 #define CR_RESULT_QUEUE 0x1c
51 #define CR_RSD0 0x40
52 #define CR_CORE_REV 0x50
53 #define CR_CORE_DES1 0x60
54 #define CR_CORE_DES2 0x70
55
56 #define DRIVER_FLAGS_BUSY BIT(0)
57 #define DRIVER_FLAGS_FINAL BIT(1)
58 #define DRIVER_FLAGS_DMA_ACTIVE BIT(2)
59 #define DRIVER_FLAGS_OUTPUT_READY BIT(3)
60 #define DRIVER_FLAGS_INIT BIT(4)
61 #define DRIVER_FLAGS_CPU BIT(5)
62 #define DRIVER_FLAGS_DMA_READY BIT(6)
63 #define DRIVER_FLAGS_ERROR BIT(7)
64 #define DRIVER_FLAGS_SG BIT(8)
65 #define DRIVER_FLAGS_SHA1 BIT(18)
66 #define DRIVER_FLAGS_SHA224 BIT(19)
67 #define DRIVER_FLAGS_SHA256 BIT(20)
68 #define DRIVER_FLAGS_MD5 BIT(21)
69
70 #define IMG_HASH_QUEUE_LENGTH 20
71 #define IMG_HASH_DMA_BURST 4
72 #define IMG_HASH_DMA_THRESHOLD 64
73
74 #ifdef __LITTLE_ENDIAN
75 #define IMG_HASH_BYTE_ORDER CR_CONTROL_BYTE_ORDER_3210
76 #else
77 #define IMG_HASH_BYTE_ORDER CR_CONTROL_BYTE_ORDER_0123
78 #endif
79
80 struct img_hash_dev;
81
82 struct img_hash_request_ctx {
83 struct img_hash_dev *hdev;
84 u8 digest[SHA256_DIGEST_SIZE] __aligned(sizeof(u32));
85 unsigned long flags;
86 size_t digsize;
87
88 dma_addr_t dma_addr;
89 size_t dma_ct;
90
91 /* sg root */
92 struct scatterlist *sgfirst;
93 /* walk state */
94 struct scatterlist *sg;
95 size_t nents;
96 size_t offset;
97 unsigned int total;
98 size_t sent;
99
100 unsigned long op;
101
102 size_t bufcnt;
103 struct ahash_request fallback_req;
104
105 /* Zero length buffer must remain last member of struct */
106 u8 buffer[0] __aligned(sizeof(u32));
107 };
108
109 struct img_hash_ctx {
110 struct img_hash_dev *hdev;
111 unsigned long flags;
112 struct crypto_ahash *fallback;
113 };
114
115 struct img_hash_dev {
116 struct list_head list;
117 struct device *dev;
118 struct clk *hash_clk;
119 struct clk *sys_clk;
120 void __iomem *io_base;
121
122 phys_addr_t bus_addr;
123 void __iomem *cpu_addr;
124
125 spinlock_t lock;
126 int err;
127 struct tasklet_struct done_task;
128 struct tasklet_struct dma_task;
129
130 unsigned long flags;
131 struct crypto_queue queue;
132 struct ahash_request *req;
133
134 struct dma_chan *dma_lch;
135 };
136
137 struct img_hash_drv {
138 struct list_head dev_list;
139 spinlock_t lock;
140 };
141
142 static struct img_hash_drv img_hash = {
143 .dev_list = LIST_HEAD_INIT(img_hash.dev_list),
144 .lock = __SPIN_LOCK_UNLOCKED(img_hash.lock),
145 };
146
147 static inline u32 img_hash_read(struct img_hash_dev *hdev, u32 offset)
148 {
149 return readl_relaxed(hdev->io_base + offset);
150 }
151
152 static inline void img_hash_write(struct img_hash_dev *hdev,
153 u32 offset, u32 value)
154 {
155 writel_relaxed(value, hdev->io_base + offset);
156 }
157
158 static inline u32 img_hash_read_result_queue(struct img_hash_dev *hdev)
159 {
160 return be32_to_cpu(img_hash_read(hdev, CR_RESULT_QUEUE));
161 }
162
163 static void img_hash_start(struct img_hash_dev *hdev, bool dma)
164 {
165 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
166 u32 cr = IMG_HASH_BYTE_ORDER << CR_CONTROL_BYTE_ORDER_SHIFT;
167
168 if (ctx->flags & DRIVER_FLAGS_MD5)
169 cr |= CR_CONTROL_ALGO_MD5;
170 else if (ctx->flags & DRIVER_FLAGS_SHA1)
171 cr |= CR_CONTROL_ALGO_SHA1;
172 else if (ctx->flags & DRIVER_FLAGS_SHA224)
173 cr |= CR_CONTROL_ALGO_SHA224;
174 else if (ctx->flags & DRIVER_FLAGS_SHA256)
175 cr |= CR_CONTROL_ALGO_SHA256;
176 dev_dbg(hdev->dev, "Starting hash process\n");
177 img_hash_write(hdev, CR_CONTROL, cr);
178
179 /*
180 * The hardware block requires two cycles between writing the control
181 * register and writing the first word of data in non DMA mode, to
182 * ensure the first data write is not grouped in burst with the control
183 * register write a read is issued to 'flush' the bus.
184 */
185 if (!dma)
186 img_hash_read(hdev, CR_CONTROL);
187 }
188
189 static int img_hash_xmit_cpu(struct img_hash_dev *hdev, const u8 *buf,
190 size_t length, int final)
191 {
192 u32 count, len32;
193 const u32 *buffer = (const u32 *)buf;
194
195 dev_dbg(hdev->dev, "xmit_cpu: length: %zu bytes\n", length);
196
197 if (final)
198 hdev->flags |= DRIVER_FLAGS_FINAL;
199
200 len32 = DIV_ROUND_UP(length, sizeof(u32));
201
202 for (count = 0; count < len32; count++)
203 writel_relaxed(buffer[count], hdev->cpu_addr);
204
205 return -EINPROGRESS;
206 }
207
208 static void img_hash_dma_callback(void *data)
209 {
210 struct img_hash_dev *hdev = (struct img_hash_dev *)data;
211 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
212
213 if (ctx->bufcnt) {
214 img_hash_xmit_cpu(hdev, ctx->buffer, ctx->bufcnt, 0);
215 ctx->bufcnt = 0;
216 }
217 if (ctx->sg)
218 tasklet_schedule(&hdev->dma_task);
219 }
220
221 static int img_hash_xmit_dma(struct img_hash_dev *hdev, struct scatterlist *sg)
222 {
223 struct dma_async_tx_descriptor *desc;
224 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
225
226 ctx->dma_ct = dma_map_sg(hdev->dev, sg, 1, DMA_TO_DEVICE);
227 if (ctx->dma_ct == 0) {
228 dev_err(hdev->dev, "Invalid DMA sg\n");
229 hdev->err = -EINVAL;
230 return -EINVAL;
231 }
232
233 desc = dmaengine_prep_slave_sg(hdev->dma_lch,
234 sg,
235 ctx->dma_ct,
236 DMA_MEM_TO_DEV,
237 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
238 if (!desc) {
239 dev_err(hdev->dev, "Null DMA descriptor\n");
240 hdev->err = -EINVAL;
241 dma_unmap_sg(hdev->dev, sg, 1, DMA_TO_DEVICE);
242 return -EINVAL;
243 }
244 desc->callback = img_hash_dma_callback;
245 desc->callback_param = hdev;
246 dmaengine_submit(desc);
247 dma_async_issue_pending(hdev->dma_lch);
248
249 return 0;
250 }
251
252 static int img_hash_write_via_cpu(struct img_hash_dev *hdev)
253 {
254 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
255
256 ctx->bufcnt = sg_copy_to_buffer(hdev->req->src, sg_nents(ctx->sg),
257 ctx->buffer, hdev->req->nbytes);
258
259 ctx->total = hdev->req->nbytes;
260 ctx->bufcnt = 0;
261
262 hdev->flags |= (DRIVER_FLAGS_CPU | DRIVER_FLAGS_FINAL);
263
264 img_hash_start(hdev, false);
265
266 return img_hash_xmit_cpu(hdev, ctx->buffer, ctx->total, 1);
267 }
268
269 static int img_hash_finish(struct ahash_request *req)
270 {
271 struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
272
273 if (!req->result)
274 return -EINVAL;
275
276 memcpy(req->result, ctx->digest, ctx->digsize);
277
278 return 0;
279 }
280
281 static void img_hash_copy_hash(struct ahash_request *req)
282 {
283 struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
284 u32 *hash = (u32 *)ctx->digest;
285 int i;
286
287 for (i = (ctx->digsize / sizeof(u32)) - 1; i >= 0; i--)
288 hash[i] = img_hash_read_result_queue(ctx->hdev);
289 }
290
291 static void img_hash_finish_req(struct ahash_request *req, int err)
292 {
293 struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
294 struct img_hash_dev *hdev = ctx->hdev;
295
296 if (!err) {
297 img_hash_copy_hash(req);
298 if (DRIVER_FLAGS_FINAL & hdev->flags)
299 err = img_hash_finish(req);
300 } else {
301 dev_warn(hdev->dev, "Hash failed with error %d\n", err);
302 ctx->flags |= DRIVER_FLAGS_ERROR;
303 }
304
305 hdev->flags &= ~(DRIVER_FLAGS_DMA_READY | DRIVER_FLAGS_OUTPUT_READY |
306 DRIVER_FLAGS_CPU | DRIVER_FLAGS_BUSY | DRIVER_FLAGS_FINAL);
307
308 if (req->base.complete)
309 req->base.complete(&req->base, err);
310 }
311
312 static int img_hash_write_via_dma(struct img_hash_dev *hdev)
313 {
314 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
315
316 img_hash_start(hdev, true);
317
318 dev_dbg(hdev->dev, "xmit dma size: %d\n", ctx->total);
319
320 if (!ctx->total)
321 hdev->flags |= DRIVER_FLAGS_FINAL;
322
323 hdev->flags |= DRIVER_FLAGS_DMA_ACTIVE | DRIVER_FLAGS_FINAL;
324
325 tasklet_schedule(&hdev->dma_task);
326
327 return -EINPROGRESS;
328 }
329
330 static int img_hash_dma_init(struct img_hash_dev *hdev)
331 {
332 struct dma_slave_config dma_conf;
333 int err = -EINVAL;
334
335 hdev->dma_lch = dma_request_chan(hdev->dev, "tx");
336 if (IS_ERR(hdev->dma_lch)) {
337 dev_err(hdev->dev, "Couldn't acquire a slave DMA channel.\n");
338 return PTR_ERR(hdev->dma_lch);
339 }
340 dma_conf.direction = DMA_MEM_TO_DEV;
341 dma_conf.dst_addr = hdev->bus_addr;
342 dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
343 dma_conf.dst_maxburst = IMG_HASH_DMA_BURST;
344 dma_conf.device_fc = false;
345
346 err = dmaengine_slave_config(hdev->dma_lch, &dma_conf);
347 if (err) {
348 dev_err(hdev->dev, "Couldn't configure DMA slave.\n");
349 dma_release_channel(hdev->dma_lch);
350 return err;
351 }
352
353 return 0;
354 }
355
356 static void img_hash_dma_task(unsigned long d)
357 {
358 struct img_hash_dev *hdev = (struct img_hash_dev *)d;
359 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
360 u8 *addr;
361 size_t nbytes, bleft, wsend, len, tbc;
362 struct scatterlist tsg;
363
364 if (!hdev->req || !ctx->sg)
365 return;
366
367 addr = sg_virt(ctx->sg);
368 nbytes = ctx->sg->length - ctx->offset;
369
370 /*
371 * The hash accelerator does not support a data valid mask. This means
372 * that if each dma (i.e. per page) is not a multiple of 4 bytes, the
373 * padding bytes in the last word written by that dma would erroneously
374 * be included in the hash. To avoid this we round down the transfer,
375 * and add the excess to the start of the next dma. It does not matter
376 * that the final dma may not be a multiple of 4 bytes as the hashing
377 * block is programmed to accept the correct number of bytes.
378 */
379
380 bleft = nbytes % 4;
381 wsend = (nbytes / 4);
382
383 if (wsend) {
384 sg_init_one(&tsg, addr + ctx->offset, wsend * 4);
385 if (img_hash_xmit_dma(hdev, &tsg)) {
386 dev_err(hdev->dev, "DMA failed, falling back to CPU");
387 ctx->flags |= DRIVER_FLAGS_CPU;
388 hdev->err = 0;
389 img_hash_xmit_cpu(hdev, addr + ctx->offset,
390 wsend * 4, 0);
391 ctx->sent += wsend * 4;
392 wsend = 0;
393 } else {
394 ctx->sent += wsend * 4;
395 }
396 }
397
398 if (bleft) {
399 ctx->bufcnt = sg_pcopy_to_buffer(ctx->sgfirst, ctx->nents,
400 ctx->buffer, bleft, ctx->sent);
401 tbc = 0;
402 ctx->sg = sg_next(ctx->sg);
403 while (ctx->sg && (ctx->bufcnt < 4)) {
404 len = ctx->sg->length;
405 if (likely(len > (4 - ctx->bufcnt)))
406 len = 4 - ctx->bufcnt;
407 tbc = sg_pcopy_to_buffer(ctx->sgfirst, ctx->nents,
408 ctx->buffer + ctx->bufcnt, len,
409 ctx->sent + ctx->bufcnt);
410 ctx->bufcnt += tbc;
411 if (tbc >= ctx->sg->length) {
412 ctx->sg = sg_next(ctx->sg);
413 tbc = 0;
414 }
415 }
416
417 ctx->sent += ctx->bufcnt;
418 ctx->offset = tbc;
419
420 if (!wsend)
421 img_hash_dma_callback(hdev);
422 } else {
423 ctx->offset = 0;
424 ctx->sg = sg_next(ctx->sg);
425 }
426 }
427
428 static int img_hash_write_via_dma_stop(struct img_hash_dev *hdev)
429 {
430 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
431
432 if (ctx->flags & DRIVER_FLAGS_SG)
433 dma_unmap_sg(hdev->dev, ctx->sg, ctx->dma_ct, DMA_TO_DEVICE);
434
435 return 0;
436 }
437
438 static int img_hash_process_data(struct img_hash_dev *hdev)
439 {
440 struct ahash_request *req = hdev->req;
441 struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
442 int err = 0;
443
444 ctx->bufcnt = 0;
445
446 if (req->nbytes >= IMG_HASH_DMA_THRESHOLD) {
447 dev_dbg(hdev->dev, "process data request(%d bytes) using DMA\n",
448 req->nbytes);
449 err = img_hash_write_via_dma(hdev);
450 } else {
451 dev_dbg(hdev->dev, "process data request(%d bytes) using CPU\n",
452 req->nbytes);
453 err = img_hash_write_via_cpu(hdev);
454 }
455 return err;
456 }
457
458 static int img_hash_hw_init(struct img_hash_dev *hdev)
459 {
460 unsigned long long nbits;
461 u32 u, l;
462
463 img_hash_write(hdev, CR_RESET, CR_RESET_SET);
464 img_hash_write(hdev, CR_RESET, CR_RESET_UNSET);
465 img_hash_write(hdev, CR_INTENAB, CR_INT_NEW_RESULTS_SET);
466
467 nbits = (u64)hdev->req->nbytes << 3;
468 u = nbits >> 32;
469 l = nbits;
470 img_hash_write(hdev, CR_MESSAGE_LENGTH_H, u);
471 img_hash_write(hdev, CR_MESSAGE_LENGTH_L, l);
472
473 if (!(DRIVER_FLAGS_INIT & hdev->flags)) {
474 hdev->flags |= DRIVER_FLAGS_INIT;
475 hdev->err = 0;
476 }
477 dev_dbg(hdev->dev, "hw initialized, nbits: %llx\n", nbits);
478 return 0;
479 }
480
481 static int img_hash_init(struct ahash_request *req)
482 {
483 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
484 struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
485 struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
486
487 ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
488 rctx->fallback_req.base.flags = req->base.flags
489 & CRYPTO_TFM_REQ_MAY_SLEEP;
490
491 return crypto_ahash_init(&rctx->fallback_req);
492 }
493
494 static int img_hash_handle_queue(struct img_hash_dev *hdev,
495 struct ahash_request *req)
496 {
497 struct crypto_async_request *async_req, *backlog;
498 struct img_hash_request_ctx *ctx;
499 unsigned long flags;
500 int err = 0, res = 0;
501
502 spin_lock_irqsave(&hdev->lock, flags);
503
504 if (req)
505 res = ahash_enqueue_request(&hdev->queue, req);
506
507 if (DRIVER_FLAGS_BUSY & hdev->flags) {
508 spin_unlock_irqrestore(&hdev->lock, flags);
509 return res;
510 }
511
512 backlog = crypto_get_backlog(&hdev->queue);
513 async_req = crypto_dequeue_request(&hdev->queue);
514 if (async_req)
515 hdev->flags |= DRIVER_FLAGS_BUSY;
516
517 spin_unlock_irqrestore(&hdev->lock, flags);
518
519 if (!async_req)
520 return res;
521
522 if (backlog)
523 backlog->complete(backlog, -EINPROGRESS);
524
525 req = ahash_request_cast(async_req);
526 hdev->req = req;
527
528 ctx = ahash_request_ctx(req);
529
530 dev_info(hdev->dev, "processing req, op: %lu, bytes: %d\n",
531 ctx->op, req->nbytes);
532
533 err = img_hash_hw_init(hdev);
534
535 if (!err)
536 err = img_hash_process_data(hdev);
537
538 if (err != -EINPROGRESS) {
539 /* done_task will not finish so do it here */
540 img_hash_finish_req(req, err);
541 }
542 return res;
543 }
544
545 static int img_hash_update(struct ahash_request *req)
546 {
547 struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
548 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
549 struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
550
551 ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
552 rctx->fallback_req.base.flags = req->base.flags
553 & CRYPTO_TFM_REQ_MAY_SLEEP;
554 rctx->fallback_req.nbytes = req->nbytes;
555 rctx->fallback_req.src = req->src;
556
557 return crypto_ahash_update(&rctx->fallback_req);
558 }
559
560 static int img_hash_final(struct ahash_request *req)
561 {
562 struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
563 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
564 struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
565
566 ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
567 rctx->fallback_req.base.flags = req->base.flags
568 & CRYPTO_TFM_REQ_MAY_SLEEP;
569 rctx->fallback_req.result = req->result;
570
571 return crypto_ahash_final(&rctx->fallback_req);
572 }
573
574 static int img_hash_finup(struct ahash_request *req)
575 {
576 struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
577 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
578 struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
579
580 ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
581 rctx->fallback_req.base.flags = req->base.flags
582 & CRYPTO_TFM_REQ_MAY_SLEEP;
583 rctx->fallback_req.nbytes = req->nbytes;
584 rctx->fallback_req.src = req->src;
585 rctx->fallback_req.result = req->result;
586
587 return crypto_ahash_finup(&rctx->fallback_req);
588 }
589
590 static int img_hash_import(struct ahash_request *req, const void *in)
591 {
592 struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
593 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
594 struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
595
596 ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
597 rctx->fallback_req.base.flags = req->base.flags
598 & CRYPTO_TFM_REQ_MAY_SLEEP;
599
600 return crypto_ahash_import(&rctx->fallback_req, in);
601 }
602
603 static int img_hash_export(struct ahash_request *req, void *out)
604 {
605 struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
606 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
607 struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
608
609 ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
610 rctx->fallback_req.base.flags = req->base.flags
611 & CRYPTO_TFM_REQ_MAY_SLEEP;
612
613 return crypto_ahash_export(&rctx->fallback_req, out);
614 }
615
616 static int img_hash_digest(struct ahash_request *req)
617 {
618 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
619 struct img_hash_ctx *tctx = crypto_ahash_ctx(tfm);
620 struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
621 struct img_hash_dev *hdev = NULL;
622 struct img_hash_dev *tmp;
623 int err;
624
625 spin_lock(&img_hash.lock);
626 if (!tctx->hdev) {
627 list_for_each_entry(tmp, &img_hash.dev_list, list) {
628 hdev = tmp;
629 break;
630 }
631 tctx->hdev = hdev;
632
633 } else {
634 hdev = tctx->hdev;
635 }
636
637 spin_unlock(&img_hash.lock);
638 ctx->hdev = hdev;
639 ctx->flags = 0;
640 ctx->digsize = crypto_ahash_digestsize(tfm);
641
642 switch (ctx->digsize) {
643 case SHA1_DIGEST_SIZE:
644 ctx->flags |= DRIVER_FLAGS_SHA1;
645 break;
646 case SHA256_DIGEST_SIZE:
647 ctx->flags |= DRIVER_FLAGS_SHA256;
648 break;
649 case SHA224_DIGEST_SIZE:
650 ctx->flags |= DRIVER_FLAGS_SHA224;
651 break;
652 case MD5_DIGEST_SIZE:
653 ctx->flags |= DRIVER_FLAGS_MD5;
654 break;
655 default:
656 return -EINVAL;
657 }
658
659 ctx->bufcnt = 0;
660 ctx->offset = 0;
661 ctx->sent = 0;
662 ctx->total = req->nbytes;
663 ctx->sg = req->src;
664 ctx->sgfirst = req->src;
665 ctx->nents = sg_nents(ctx->sg);
666
667 err = img_hash_handle_queue(tctx->hdev, req);
668
669 return err;
670 }
671
672 static int img_hash_cra_init(struct crypto_tfm *tfm, const char *alg_name)
673 {
674 struct img_hash_ctx *ctx = crypto_tfm_ctx(tfm);
675 int err = -ENOMEM;
676
677 ctx->fallback = crypto_alloc_ahash(alg_name, 0,
678 CRYPTO_ALG_NEED_FALLBACK);
679 if (IS_ERR(ctx->fallback)) {
680 pr_err("img_hash: Could not load fallback driver.\n");
681 err = PTR_ERR(ctx->fallback);
682 goto err;
683 }
684 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
685 sizeof(struct img_hash_request_ctx) +
686 crypto_ahash_reqsize(ctx->fallback) +
687 IMG_HASH_DMA_THRESHOLD);
688
689 return 0;
690
691 err:
692 return err;
693 }
694
695 static int img_hash_cra_md5_init(struct crypto_tfm *tfm)
696 {
697 return img_hash_cra_init(tfm, "md5-generic");
698 }
699
700 static int img_hash_cra_sha1_init(struct crypto_tfm *tfm)
701 {
702 return img_hash_cra_init(tfm, "sha1-generic");
703 }
704
705 static int img_hash_cra_sha224_init(struct crypto_tfm *tfm)
706 {
707 return img_hash_cra_init(tfm, "sha224-generic");
708 }
709
710 static int img_hash_cra_sha256_init(struct crypto_tfm *tfm)
711 {
712 return img_hash_cra_init(tfm, "sha256-generic");
713 }
714
715 static void img_hash_cra_exit(struct crypto_tfm *tfm)
716 {
717 struct img_hash_ctx *tctx = crypto_tfm_ctx(tfm);
718
719 crypto_free_ahash(tctx->fallback);
720 }
721
722 static irqreturn_t img_irq_handler(int irq, void *dev_id)
723 {
724 struct img_hash_dev *hdev = dev_id;
725 u32 reg;
726
727 reg = img_hash_read(hdev, CR_INTSTAT);
728 img_hash_write(hdev, CR_INTCLEAR, reg);
729
730 if (reg & CR_INT_NEW_RESULTS_SET) {
731 dev_dbg(hdev->dev, "IRQ CR_INT_NEW_RESULTS_SET\n");
732 if (DRIVER_FLAGS_BUSY & hdev->flags) {
733 hdev->flags |= DRIVER_FLAGS_OUTPUT_READY;
734 if (!(DRIVER_FLAGS_CPU & hdev->flags))
735 hdev->flags |= DRIVER_FLAGS_DMA_READY;
736 tasklet_schedule(&hdev->done_task);
737 } else {
738 dev_warn(hdev->dev,
739 "HASH interrupt when no active requests.\n");
740 }
741 } else if (reg & CR_INT_RESULTS_AVAILABLE) {
742 dev_warn(hdev->dev,
743 "IRQ triggered before the hash had completed\n");
744 } else if (reg & CR_INT_RESULT_READ_ERR) {
745 dev_warn(hdev->dev,
746 "Attempt to read from an empty result queue\n");
747 } else if (reg & CR_INT_MESSAGE_WRITE_ERROR) {
748 dev_warn(hdev->dev,
749 "Data written before the hardware was configured\n");
750 }
751 return IRQ_HANDLED;
752 }
753
754 static struct ahash_alg img_algs[] = {
755 {
756 .init = img_hash_init,
757 .update = img_hash_update,
758 .final = img_hash_final,
759 .finup = img_hash_finup,
760 .export = img_hash_export,
761 .import = img_hash_import,
762 .digest = img_hash_digest,
763 .halg = {
764 .digestsize = MD5_DIGEST_SIZE,
765 .statesize = sizeof(struct md5_state),
766 .base = {
767 .cra_name = "md5",
768 .cra_driver_name = "img-md5",
769 .cra_priority = 300,
770 .cra_flags =
771 CRYPTO_ALG_ASYNC |
772 CRYPTO_ALG_NEED_FALLBACK,
773 .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
774 .cra_ctxsize = sizeof(struct img_hash_ctx),
775 .cra_init = img_hash_cra_md5_init,
776 .cra_exit = img_hash_cra_exit,
777 .cra_module = THIS_MODULE,
778 }
779 }
780 },
781 {
782 .init = img_hash_init,
783 .update = img_hash_update,
784 .final = img_hash_final,
785 .finup = img_hash_finup,
786 .export = img_hash_export,
787 .import = img_hash_import,
788 .digest = img_hash_digest,
789 .halg = {
790 .digestsize = SHA1_DIGEST_SIZE,
791 .statesize = sizeof(struct sha1_state),
792 .base = {
793 .cra_name = "sha1",
794 .cra_driver_name = "img-sha1",
795 .cra_priority = 300,
796 .cra_flags =
797 CRYPTO_ALG_ASYNC |
798 CRYPTO_ALG_NEED_FALLBACK,
799 .cra_blocksize = SHA1_BLOCK_SIZE,
800 .cra_ctxsize = sizeof(struct img_hash_ctx),
801 .cra_init = img_hash_cra_sha1_init,
802 .cra_exit = img_hash_cra_exit,
803 .cra_module = THIS_MODULE,
804 }
805 }
806 },
807 {
808 .init = img_hash_init,
809 .update = img_hash_update,
810 .final = img_hash_final,
811 .finup = img_hash_finup,
812 .export = img_hash_export,
813 .import = img_hash_import,
814 .digest = img_hash_digest,
815 .halg = {
816 .digestsize = SHA224_DIGEST_SIZE,
817 .statesize = sizeof(struct sha256_state),
818 .base = {
819 .cra_name = "sha224",
820 .cra_driver_name = "img-sha224",
821 .cra_priority = 300,
822 .cra_flags =
823 CRYPTO_ALG_ASYNC |
824 CRYPTO_ALG_NEED_FALLBACK,
825 .cra_blocksize = SHA224_BLOCK_SIZE,
826 .cra_ctxsize = sizeof(struct img_hash_ctx),
827 .cra_init = img_hash_cra_sha224_init,
828 .cra_exit = img_hash_cra_exit,
829 .cra_module = THIS_MODULE,
830 }
831 }
832 },
833 {
834 .init = img_hash_init,
835 .update = img_hash_update,
836 .final = img_hash_final,
837 .finup = img_hash_finup,
838 .export = img_hash_export,
839 .import = img_hash_import,
840 .digest = img_hash_digest,
841 .halg = {
842 .digestsize = SHA256_DIGEST_SIZE,
843 .statesize = sizeof(struct sha256_state),
844 .base = {
845 .cra_name = "sha256",
846 .cra_driver_name = "img-sha256",
847 .cra_priority = 300,
848 .cra_flags =
849 CRYPTO_ALG_ASYNC |
850 CRYPTO_ALG_NEED_FALLBACK,
851 .cra_blocksize = SHA256_BLOCK_SIZE,
852 .cra_ctxsize = sizeof(struct img_hash_ctx),
853 .cra_init = img_hash_cra_sha256_init,
854 .cra_exit = img_hash_cra_exit,
855 .cra_module = THIS_MODULE,
856 }
857 }
858 }
859 };
860
861 static int img_register_algs(struct img_hash_dev *hdev)
862 {
863 int i, err;
864
865 for (i = 0; i < ARRAY_SIZE(img_algs); i++) {
866 err = crypto_register_ahash(&img_algs[i]);
867 if (err)
868 goto err_reg;
869 }
870 return 0;
871
872 err_reg:
873 for (; i--; )
874 crypto_unregister_ahash(&img_algs[i]);
875
876 return err;
877 }
878
879 static int img_unregister_algs(struct img_hash_dev *hdev)
880 {
881 int i;
882
883 for (i = 0; i < ARRAY_SIZE(img_algs); i++)
884 crypto_unregister_ahash(&img_algs[i]);
885 return 0;
886 }
887
888 static void img_hash_done_task(unsigned long data)
889 {
890 struct img_hash_dev *hdev = (struct img_hash_dev *)data;
891 int err = 0;
892
893 if (hdev->err == -EINVAL) {
894 err = hdev->err;
895 goto finish;
896 }
897
898 if (!(DRIVER_FLAGS_BUSY & hdev->flags)) {
899 img_hash_handle_queue(hdev, NULL);
900 return;
901 }
902
903 if (DRIVER_FLAGS_CPU & hdev->flags) {
904 if (DRIVER_FLAGS_OUTPUT_READY & hdev->flags) {
905 hdev->flags &= ~DRIVER_FLAGS_OUTPUT_READY;
906 goto finish;
907 }
908 } else if (DRIVER_FLAGS_DMA_READY & hdev->flags) {
909 if (DRIVER_FLAGS_DMA_ACTIVE & hdev->flags) {
910 hdev->flags &= ~DRIVER_FLAGS_DMA_ACTIVE;
911 img_hash_write_via_dma_stop(hdev);
912 if (hdev->err) {
913 err = hdev->err;
914 goto finish;
915 }
916 }
917 if (DRIVER_FLAGS_OUTPUT_READY & hdev->flags) {
918 hdev->flags &= ~(DRIVER_FLAGS_DMA_READY |
919 DRIVER_FLAGS_OUTPUT_READY);
920 goto finish;
921 }
922 }
923 return;
924
925 finish:
926 img_hash_finish_req(hdev->req, err);
927 }
928
929 static const struct of_device_id img_hash_match[] = {
930 { .compatible = "img,hash-accelerator" },
931 {}
932 };
933 MODULE_DEVICE_TABLE(of, img_hash_match);
934
935 static int img_hash_probe(struct platform_device *pdev)
936 {
937 struct img_hash_dev *hdev;
938 struct device *dev = &pdev->dev;
939 struct resource *hash_res;
940 int irq;
941 int err;
942
943 hdev = devm_kzalloc(dev, sizeof(*hdev), GFP_KERNEL);
944 if (hdev == NULL)
945 return -ENOMEM;
946
947 spin_lock_init(&hdev->lock);
948
949 hdev->dev = dev;
950
951 platform_set_drvdata(pdev, hdev);
952
953 INIT_LIST_HEAD(&hdev->list);
954
955 tasklet_init(&hdev->done_task, img_hash_done_task, (unsigned long)hdev);
956 tasklet_init(&hdev->dma_task, img_hash_dma_task, (unsigned long)hdev);
957
958 crypto_init_queue(&hdev->queue, IMG_HASH_QUEUE_LENGTH);
959
960 /* Register bank */
961 hdev->io_base = devm_platform_ioremap_resource(pdev, 0);
962 if (IS_ERR(hdev->io_base)) {
963 err = PTR_ERR(hdev->io_base);
964 dev_err(dev, "can't ioremap, returned %d\n", err);
965
966 goto res_err;
967 }
968
969 /* Write port (DMA or CPU) */
970 hash_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
971 hdev->cpu_addr = devm_ioremap_resource(dev, hash_res);
972 if (IS_ERR(hdev->cpu_addr)) {
973 dev_err(dev, "can't ioremap write port\n");
974 err = PTR_ERR(hdev->cpu_addr);
975 goto res_err;
976 }
977 hdev->bus_addr = hash_res->start;
978
979 irq = platform_get_irq(pdev, 0);
980 if (irq < 0) {
981 err = irq;
982 goto res_err;
983 }
984
985 err = devm_request_irq(dev, irq, img_irq_handler, 0,
986 dev_name(dev), hdev);
987 if (err) {
988 dev_err(dev, "unable to request irq\n");
989 goto res_err;
990 }
991 dev_dbg(dev, "using IRQ channel %d\n", irq);
992
993 hdev->hash_clk = devm_clk_get(&pdev->dev, "hash");
994 if (IS_ERR(hdev->hash_clk)) {
995 dev_err(dev, "clock initialization failed.\n");
996 err = PTR_ERR(hdev->hash_clk);
997 goto res_err;
998 }
999
1000 hdev->sys_clk = devm_clk_get(&pdev->dev, "sys");
1001 if (IS_ERR(hdev->sys_clk)) {
1002 dev_err(dev, "clock initialization failed.\n");
1003 err = PTR_ERR(hdev->sys_clk);
1004 goto res_err;
1005 }
1006
1007 err = clk_prepare_enable(hdev->hash_clk);
1008 if (err)
1009 goto res_err;
1010
1011 err = clk_prepare_enable(hdev->sys_clk);
1012 if (err)
1013 goto clk_err;
1014
1015 err = img_hash_dma_init(hdev);
1016 if (err)
1017 goto dma_err;
1018
1019 dev_dbg(dev, "using %s for DMA transfers\n",
1020 dma_chan_name(hdev->dma_lch));
1021
1022 spin_lock(&img_hash.lock);
1023 list_add_tail(&hdev->list, &img_hash.dev_list);
1024 spin_unlock(&img_hash.lock);
1025
1026 err = img_register_algs(hdev);
1027 if (err)
1028 goto err_algs;
1029 dev_info(dev, "Img MD5/SHA1/SHA224/SHA256 Hardware accelerator initialized\n");
1030
1031 return 0;
1032
1033 err_algs:
1034 spin_lock(&img_hash.lock);
1035 list_del(&hdev->list);
1036 spin_unlock(&img_hash.lock);
1037 dma_release_channel(hdev->dma_lch);
1038 dma_err:
1039 clk_disable_unprepare(hdev->sys_clk);
1040 clk_err:
1041 clk_disable_unprepare(hdev->hash_clk);
1042 res_err:
1043 tasklet_kill(&hdev->done_task);
1044 tasklet_kill(&hdev->dma_task);
1045
1046 return err;
1047 }
1048
1049 static int img_hash_remove(struct platform_device *pdev)
1050 {
1051 struct img_hash_dev *hdev;
1052
1053 hdev = platform_get_drvdata(pdev);
1054 spin_lock(&img_hash.lock);
1055 list_del(&hdev->list);
1056 spin_unlock(&img_hash.lock);
1057
1058 img_unregister_algs(hdev);
1059
1060 tasklet_kill(&hdev->done_task);
1061 tasklet_kill(&hdev->dma_task);
1062
1063 dma_release_channel(hdev->dma_lch);
1064
1065 clk_disable_unprepare(hdev->hash_clk);
1066 clk_disable_unprepare(hdev->sys_clk);
1067
1068 return 0;
1069 }
1070
1071 #ifdef CONFIG_PM_SLEEP
1072 static int img_hash_suspend(struct device *dev)
1073 {
1074 struct img_hash_dev *hdev = dev_get_drvdata(dev);
1075
1076 clk_disable_unprepare(hdev->hash_clk);
1077 clk_disable_unprepare(hdev->sys_clk);
1078
1079 return 0;
1080 }
1081
1082 static int img_hash_resume(struct device *dev)
1083 {
1084 struct img_hash_dev *hdev = dev_get_drvdata(dev);
1085 int ret;
1086
1087 ret = clk_prepare_enable(hdev->hash_clk);
1088 if (ret)
1089 return ret;
1090
1091 ret = clk_prepare_enable(hdev->sys_clk);
1092 if (ret) {
1093 clk_disable_unprepare(hdev->hash_clk);
1094 return ret;
1095 }
1096
1097 return 0;
1098 }
1099 #endif /* CONFIG_PM_SLEEP */
1100
1101 static const struct dev_pm_ops img_hash_pm_ops = {
1102 SET_SYSTEM_SLEEP_PM_OPS(img_hash_suspend, img_hash_resume)
1103 };
1104
1105 static struct platform_driver img_hash_driver = {
1106 .probe = img_hash_probe,
1107 .remove = img_hash_remove,
1108 .driver = {
1109 .name = "img-hash-accelerator",
1110 .pm = &img_hash_pm_ops,
1111 .of_match_table = of_match_ptr(img_hash_match),
1112 }
1113 };
1114 module_platform_driver(img_hash_driver);
1115
1116 MODULE_LICENSE("GPL v2");
1117 MODULE_DESCRIPTION("Imgtec SHA1/224/256 & MD5 hw accelerator driver");
1118 MODULE_AUTHOR("Will Thomas.");
1119 MODULE_AUTHOR("James Hartley <james.hartley@imgtec.com>");
Linux with added FPC-III support