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9#include <linux/clk.h>
10#include <linux/dma-mapping.h>
11#include <linux/dmaengine.h>
12#include <linux/interrupt.h>
13#include <linux/io.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/of_device.h>
17#include <linux/platform_device.h>
18#include <linux/scatterlist.h>
19
20#include <crypto/internal/hash.h>
21#include <crypto/md5.h>
22#include <crypto/sha1.h>
23#include <crypto/sha2.h>
24
25#define CR_RESET 0
26#define CR_RESET_SET 1
27#define CR_RESET_UNSET 0
28
29#define CR_MESSAGE_LENGTH_H 0x4
30#define CR_MESSAGE_LENGTH_L 0x8
31
32#define CR_CONTROL 0xc
33#define CR_CONTROL_BYTE_ORDER_3210 0
34#define CR_CONTROL_BYTE_ORDER_0123 1
35#define CR_CONTROL_BYTE_ORDER_2310 2
36#define CR_CONTROL_BYTE_ORDER_1032 3
37#define CR_CONTROL_BYTE_ORDER_SHIFT 8
38#define CR_CONTROL_ALGO_MD5 0
39#define CR_CONTROL_ALGO_SHA1 1
40#define CR_CONTROL_ALGO_SHA224 2
41#define CR_CONTROL_ALGO_SHA256 3
42
43#define CR_INTSTAT 0x10
44#define CR_INTENAB 0x14
45#define CR_INTCLEAR 0x18
46#define CR_INT_RESULTS_AVAILABLE BIT(0)
47#define CR_INT_NEW_RESULTS_SET BIT(1)
48#define CR_INT_RESULT_READ_ERR BIT(2)
49#define CR_INT_MESSAGE_WRITE_ERROR BIT(3)
50#define CR_INT_STATUS BIT(8)
51
52#define CR_RESULT_QUEUE 0x1c
53#define CR_RSD0 0x40
54#define CR_CORE_REV 0x50
55#define CR_CORE_DES1 0x60
56#define CR_CORE_DES2 0x70
57
58#define DRIVER_FLAGS_BUSY BIT(0)
59#define DRIVER_FLAGS_FINAL BIT(1)
60#define DRIVER_FLAGS_DMA_ACTIVE BIT(2)
61#define DRIVER_FLAGS_OUTPUT_READY BIT(3)
62#define DRIVER_FLAGS_INIT BIT(4)
63#define DRIVER_FLAGS_CPU BIT(5)
64#define DRIVER_FLAGS_DMA_READY BIT(6)
65#define DRIVER_FLAGS_ERROR BIT(7)
66#define DRIVER_FLAGS_SG BIT(8)
67#define DRIVER_FLAGS_SHA1 BIT(18)
68#define DRIVER_FLAGS_SHA224 BIT(19)
69#define DRIVER_FLAGS_SHA256 BIT(20)
70#define DRIVER_FLAGS_MD5 BIT(21)
71
72#define IMG_HASH_QUEUE_LENGTH 20
73#define IMG_HASH_DMA_BURST 4
74#define IMG_HASH_DMA_THRESHOLD 64
75
76#ifdef __LITTLE_ENDIAN
77#define IMG_HASH_BYTE_ORDER CR_CONTROL_BYTE_ORDER_3210
78#else
79#define IMG_HASH_BYTE_ORDER CR_CONTROL_BYTE_ORDER_0123
80#endif
81
82struct img_hash_dev;
83
84struct img_hash_request_ctx {
85 struct img_hash_dev *hdev;
86 u8 digest[SHA256_DIGEST_SIZE] __aligned(sizeof(u32));
87 unsigned long flags;
88 size_t digsize;
89
90 dma_addr_t dma_addr;
91 size_t dma_ct;
92
93
94 struct scatterlist *sgfirst;
95
96 struct scatterlist *sg;
97 size_t nents;
98 size_t offset;
99 unsigned int total;
100 size_t sent;
101
102 unsigned long op;
103
104 size_t bufcnt;
105 struct ahash_request fallback_req;
106
107
108 u8 buffer[] __aligned(sizeof(u32));
109};
110
111struct img_hash_ctx {
112 struct img_hash_dev *hdev;
113 unsigned long flags;
114 struct crypto_ahash *fallback;
115};
116
117struct img_hash_dev {
118 struct list_head list;
119 struct device *dev;
120 struct clk *hash_clk;
121 struct clk *sys_clk;
122 void __iomem *io_base;
123
124 phys_addr_t bus_addr;
125 void __iomem *cpu_addr;
126
127 spinlock_t lock;
128 int err;
129 struct tasklet_struct done_task;
130 struct tasklet_struct dma_task;
131
132 unsigned long flags;
133 struct crypto_queue queue;
134 struct ahash_request *req;
135
136 struct dma_chan *dma_lch;
137};
138
139struct img_hash_drv {
140 struct list_head dev_list;
141 spinlock_t lock;
142};
143
144static struct img_hash_drv img_hash = {
145 .dev_list = LIST_HEAD_INIT(img_hash.dev_list),
146 .lock = __SPIN_LOCK_UNLOCKED(img_hash.lock),
147};
148
149static inline u32 img_hash_read(struct img_hash_dev *hdev, u32 offset)
150{
151 return readl_relaxed(hdev->io_base + offset);
152}
153
154static inline void img_hash_write(struct img_hash_dev *hdev,
155 u32 offset, u32 value)
156{
157 writel_relaxed(value, hdev->io_base + offset);
158}
159
160static inline u32 img_hash_read_result_queue(struct img_hash_dev *hdev)
161{
162 return be32_to_cpu(img_hash_read(hdev, CR_RESULT_QUEUE));
163}
164
165static void img_hash_start(struct img_hash_dev *hdev, bool dma)
166{
167 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
168 u32 cr = IMG_HASH_BYTE_ORDER << CR_CONTROL_BYTE_ORDER_SHIFT;
169
170 if (ctx->flags & DRIVER_FLAGS_MD5)
171 cr |= CR_CONTROL_ALGO_MD5;
172 else if (ctx->flags & DRIVER_FLAGS_SHA1)
173 cr |= CR_CONTROL_ALGO_SHA1;
174 else if (ctx->flags & DRIVER_FLAGS_SHA224)
175 cr |= CR_CONTROL_ALGO_SHA224;
176 else if (ctx->flags & DRIVER_FLAGS_SHA256)
177 cr |= CR_CONTROL_ALGO_SHA256;
178 dev_dbg(hdev->dev, "Starting hash process\n");
179 img_hash_write(hdev, CR_CONTROL, cr);
180
181
182
183
184
185
186
187 if (!dma)
188 img_hash_read(hdev, CR_CONTROL);
189}
190
191static int img_hash_xmit_cpu(struct img_hash_dev *hdev, const u8 *buf,
192 size_t length, int final)
193{
194 u32 count, len32;
195 const u32 *buffer = (const u32 *)buf;
196
197 dev_dbg(hdev->dev, "xmit_cpu: length: %zu bytes\n", length);
198
199 if (final)
200 hdev->flags |= DRIVER_FLAGS_FINAL;
201
202 len32 = DIV_ROUND_UP(length, sizeof(u32));
203
204 for (count = 0; count < len32; count++)
205 writel_relaxed(buffer[count], hdev->cpu_addr);
206
207 return -EINPROGRESS;
208}
209
210static void img_hash_dma_callback(void *data)
211{
212 struct img_hash_dev *hdev = (struct img_hash_dev *)data;
213 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
214
215 if (ctx->bufcnt) {
216 img_hash_xmit_cpu(hdev, ctx->buffer, ctx->bufcnt, 0);
217 ctx->bufcnt = 0;
218 }
219 if (ctx->sg)
220 tasklet_schedule(&hdev->dma_task);
221}
222
223static int img_hash_xmit_dma(struct img_hash_dev *hdev, struct scatterlist *sg)
224{
225 struct dma_async_tx_descriptor *desc;
226 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
227
228 ctx->dma_ct = dma_map_sg(hdev->dev, sg, 1, DMA_TO_DEVICE);
229 if (ctx->dma_ct == 0) {
230 dev_err(hdev->dev, "Invalid DMA sg\n");
231 hdev->err = -EINVAL;
232 return -EINVAL;
233 }
234
235 desc = dmaengine_prep_slave_sg(hdev->dma_lch,
236 sg,
237 ctx->dma_ct,
238 DMA_MEM_TO_DEV,
239 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
240 if (!desc) {
241 dev_err(hdev->dev, "Null DMA descriptor\n");
242 hdev->err = -EINVAL;
243 dma_unmap_sg(hdev->dev, sg, 1, DMA_TO_DEVICE);
244 return -EINVAL;
245 }
246 desc->callback = img_hash_dma_callback;
247 desc->callback_param = hdev;
248 dmaengine_submit(desc);
249 dma_async_issue_pending(hdev->dma_lch);
250
251 return 0;
252}
253
254static int img_hash_write_via_cpu(struct img_hash_dev *hdev)
255{
256 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
257
258 ctx->bufcnt = sg_copy_to_buffer(hdev->req->src, sg_nents(ctx->sg),
259 ctx->buffer, hdev->req->nbytes);
260
261 ctx->total = hdev->req->nbytes;
262 ctx->bufcnt = 0;
263
264 hdev->flags |= (DRIVER_FLAGS_CPU | DRIVER_FLAGS_FINAL);
265
266 img_hash_start(hdev, false);
267
268 return img_hash_xmit_cpu(hdev, ctx->buffer, ctx->total, 1);
269}
270
271static int img_hash_finish(struct ahash_request *req)
272{
273 struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
274
275 if (!req->result)
276 return -EINVAL;
277
278 memcpy(req->result, ctx->digest, ctx->digsize);
279
280 return 0;
281}
282
283static void img_hash_copy_hash(struct ahash_request *req)
284{
285 struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
286 u32 *hash = (u32 *)ctx->digest;
287 int i;
288
289 for (i = (ctx->digsize / sizeof(u32)) - 1; i >= 0; i--)
290 hash[i] = img_hash_read_result_queue(ctx->hdev);
291}
292
293static void img_hash_finish_req(struct ahash_request *req, int err)
294{
295 struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
296 struct img_hash_dev *hdev = ctx->hdev;
297
298 if (!err) {
299 img_hash_copy_hash(req);
300 if (DRIVER_FLAGS_FINAL & hdev->flags)
301 err = img_hash_finish(req);
302 } else {
303 dev_warn(hdev->dev, "Hash failed with error %d\n", err);
304 ctx->flags |= DRIVER_FLAGS_ERROR;
305 }
306
307 hdev->flags &= ~(DRIVER_FLAGS_DMA_READY | DRIVER_FLAGS_OUTPUT_READY |
308 DRIVER_FLAGS_CPU | DRIVER_FLAGS_BUSY | DRIVER_FLAGS_FINAL);
309
310 if (req->base.complete)
311 req->base.complete(&req->base, err);
312}
313
314static int img_hash_write_via_dma(struct img_hash_dev *hdev)
315{
316 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
317
318 img_hash_start(hdev, true);
319
320 dev_dbg(hdev->dev, "xmit dma size: %d\n", ctx->total);
321
322 if (!ctx->total)
323 hdev->flags |= DRIVER_FLAGS_FINAL;
324
325 hdev->flags |= DRIVER_FLAGS_DMA_ACTIVE | DRIVER_FLAGS_FINAL;
326
327 tasklet_schedule(&hdev->dma_task);
328
329 return -EINPROGRESS;
330}
331
332static int img_hash_dma_init(struct img_hash_dev *hdev)
333{
334 struct dma_slave_config dma_conf;
335 int err;
336
337 hdev->dma_lch = dma_request_chan(hdev->dev, "tx");
338 if (IS_ERR(hdev->dma_lch)) {
339 dev_err(hdev->dev, "Couldn't acquire a slave DMA channel.\n");
340 return PTR_ERR(hdev->dma_lch);
341 }
342 dma_conf.direction = DMA_MEM_TO_DEV;
343 dma_conf.dst_addr = hdev->bus_addr;
344 dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
345 dma_conf.dst_maxburst = IMG_HASH_DMA_BURST;
346 dma_conf.device_fc = false;
347
348 err = dmaengine_slave_config(hdev->dma_lch, &dma_conf);
349 if (err) {
350 dev_err(hdev->dev, "Couldn't configure DMA slave.\n");
351 dma_release_channel(hdev->dma_lch);
352 return err;
353 }
354
355 return 0;
356}
357
358static void img_hash_dma_task(unsigned long d)
359{
360 struct img_hash_dev *hdev = (struct img_hash_dev *)d;
361 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
362 u8 *addr;
363 size_t nbytes, bleft, wsend, len, tbc;
364 struct scatterlist tsg;
365
366 if (!hdev->req || !ctx->sg)
367 return;
368
369 addr = sg_virt(ctx->sg);
370 nbytes = ctx->sg->length - ctx->offset;
371
372
373
374
375
376
377
378
379
380
381
382 bleft = nbytes % 4;
383 wsend = (nbytes / 4);
384
385 if (wsend) {
386 sg_init_one(&tsg, addr + ctx->offset, wsend * 4);
387 if (img_hash_xmit_dma(hdev, &tsg)) {
388 dev_err(hdev->dev, "DMA failed, falling back to CPU");
389 ctx->flags |= DRIVER_FLAGS_CPU;
390 hdev->err = 0;
391 img_hash_xmit_cpu(hdev, addr + ctx->offset,
392 wsend * 4, 0);
393 ctx->sent += wsend * 4;
394 wsend = 0;
395 } else {
396 ctx->sent += wsend * 4;
397 }
398 }
399
400 if (bleft) {
401 ctx->bufcnt = sg_pcopy_to_buffer(ctx->sgfirst, ctx->nents,
402 ctx->buffer, bleft, ctx->sent);
403 tbc = 0;
404 ctx->sg = sg_next(ctx->sg);
405 while (ctx->sg && (ctx->bufcnt < 4)) {
406 len = ctx->sg->length;
407 if (likely(len > (4 - ctx->bufcnt)))
408 len = 4 - ctx->bufcnt;
409 tbc = sg_pcopy_to_buffer(ctx->sgfirst, ctx->nents,
410 ctx->buffer + ctx->bufcnt, len,
411 ctx->sent + ctx->bufcnt);
412 ctx->bufcnt += tbc;
413 if (tbc >= ctx->sg->length) {
414 ctx->sg = sg_next(ctx->sg);
415 tbc = 0;
416 }
417 }
418
419 ctx->sent += ctx->bufcnt;
420 ctx->offset = tbc;
421
422 if (!wsend)
423 img_hash_dma_callback(hdev);
424 } else {
425 ctx->offset = 0;
426 ctx->sg = sg_next(ctx->sg);
427 }
428}
429
430static int img_hash_write_via_dma_stop(struct img_hash_dev *hdev)
431{
432 struct img_hash_request_ctx *ctx = ahash_request_ctx(hdev->req);
433
434 if (ctx->flags & DRIVER_FLAGS_SG)
435 dma_unmap_sg(hdev->dev, ctx->sg, ctx->dma_ct, DMA_TO_DEVICE);
436
437 return 0;
438}
439
440static int img_hash_process_data(struct img_hash_dev *hdev)
441{
442 struct ahash_request *req = hdev->req;
443 struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
444 int err = 0;
445
446 ctx->bufcnt = 0;
447
448 if (req->nbytes >= IMG_HASH_DMA_THRESHOLD) {
449 dev_dbg(hdev->dev, "process data request(%d bytes) using DMA\n",
450 req->nbytes);
451 err = img_hash_write_via_dma(hdev);
452 } else {
453 dev_dbg(hdev->dev, "process data request(%d bytes) using CPU\n",
454 req->nbytes);
455 err = img_hash_write_via_cpu(hdev);
456 }
457 return err;
458}
459
460static int img_hash_hw_init(struct img_hash_dev *hdev)
461{
462 unsigned long long nbits;
463 u32 u, l;
464
465 img_hash_write(hdev, CR_RESET, CR_RESET_SET);
466 img_hash_write(hdev, CR_RESET, CR_RESET_UNSET);
467 img_hash_write(hdev, CR_INTENAB, CR_INT_NEW_RESULTS_SET);
468
469 nbits = (u64)hdev->req->nbytes << 3;
470 u = nbits >> 32;
471 l = nbits;
472 img_hash_write(hdev, CR_MESSAGE_LENGTH_H, u);
473 img_hash_write(hdev, CR_MESSAGE_LENGTH_L, l);
474
475 if (!(DRIVER_FLAGS_INIT & hdev->flags)) {
476 hdev->flags |= DRIVER_FLAGS_INIT;
477 hdev->err = 0;
478 }
479 dev_dbg(hdev->dev, "hw initialized, nbits: %llx\n", nbits);
480 return 0;
481}
482
483static int img_hash_init(struct ahash_request *req)
484{
485 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
486 struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
487 struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
488
489 ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
490 rctx->fallback_req.base.flags = req->base.flags
491 & CRYPTO_TFM_REQ_MAY_SLEEP;
492
493 return crypto_ahash_init(&rctx->fallback_req);
494}
495
496static int img_hash_handle_queue(struct img_hash_dev *hdev,
497 struct ahash_request *req)
498{
499 struct crypto_async_request *async_req, *backlog;
500 struct img_hash_request_ctx *ctx;
501 unsigned long flags;
502 int err = 0, res = 0;
503
504 spin_lock_irqsave(&hdev->lock, flags);
505
506 if (req)
507 res = ahash_enqueue_request(&hdev->queue, req);
508
509 if (DRIVER_FLAGS_BUSY & hdev->flags) {
510 spin_unlock_irqrestore(&hdev->lock, flags);
511 return res;
512 }
513
514 backlog = crypto_get_backlog(&hdev->queue);
515 async_req = crypto_dequeue_request(&hdev->queue);
516 if (async_req)
517 hdev->flags |= DRIVER_FLAGS_BUSY;
518
519 spin_unlock_irqrestore(&hdev->lock, flags);
520
521 if (!async_req)
522 return res;
523
524 if (backlog)
525 backlog->complete(backlog, -EINPROGRESS);
526
527 req = ahash_request_cast(async_req);
528 hdev->req = req;
529
530 ctx = ahash_request_ctx(req);
531
532 dev_info(hdev->dev, "processing req, op: %lu, bytes: %d\n",
533 ctx->op, req->nbytes);
534
535 err = img_hash_hw_init(hdev);
536
537 if (!err)
538 err = img_hash_process_data(hdev);
539
540 if (err != -EINPROGRESS) {
541
542 img_hash_finish_req(req, err);
543 }
544 return res;
545}
546
547static int img_hash_update(struct ahash_request *req)
548{
549 struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
550 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
551 struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
552
553 ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
554 rctx->fallback_req.base.flags = req->base.flags
555 & CRYPTO_TFM_REQ_MAY_SLEEP;
556 rctx->fallback_req.nbytes = req->nbytes;
557 rctx->fallback_req.src = req->src;
558
559 return crypto_ahash_update(&rctx->fallback_req);
560}
561
562static int img_hash_final(struct ahash_request *req)
563{
564 struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
565 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
566 struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
567
568 ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
569 rctx->fallback_req.base.flags = req->base.flags
570 & CRYPTO_TFM_REQ_MAY_SLEEP;
571 rctx->fallback_req.result = req->result;
572
573 return crypto_ahash_final(&rctx->fallback_req);
574}
575
576static int img_hash_finup(struct ahash_request *req)
577{
578 struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
579 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
580 struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
581
582 ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
583 rctx->fallback_req.base.flags = req->base.flags
584 & CRYPTO_TFM_REQ_MAY_SLEEP;
585 rctx->fallback_req.nbytes = req->nbytes;
586 rctx->fallback_req.src = req->src;
587 rctx->fallback_req.result = req->result;
588
589 return crypto_ahash_finup(&rctx->fallback_req);
590}
591
592static int img_hash_import(struct ahash_request *req, const void *in)
593{
594 struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
595 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
596 struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
597
598 ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
599 rctx->fallback_req.base.flags = req->base.flags
600 & CRYPTO_TFM_REQ_MAY_SLEEP;
601
602 return crypto_ahash_import(&rctx->fallback_req, in);
603}
604
605static int img_hash_export(struct ahash_request *req, void *out)
606{
607 struct img_hash_request_ctx *rctx = ahash_request_ctx(req);
608 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
609 struct img_hash_ctx *ctx = crypto_ahash_ctx(tfm);
610
611 ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback);
612 rctx->fallback_req.base.flags = req->base.flags
613 & CRYPTO_TFM_REQ_MAY_SLEEP;
614
615 return crypto_ahash_export(&rctx->fallback_req, out);
616}
617
618static int img_hash_digest(struct ahash_request *req)
619{
620 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
621 struct img_hash_ctx *tctx = crypto_ahash_ctx(tfm);
622 struct img_hash_request_ctx *ctx = ahash_request_ctx(req);
623 struct img_hash_dev *hdev = NULL;
624 struct img_hash_dev *tmp;
625 int err;
626
627 spin_lock(&img_hash.lock);
628 if (!tctx->hdev) {
629 list_for_each_entry(tmp, &img_hash.dev_list, list) {
630 hdev = tmp;
631 break;
632 }
633 tctx->hdev = hdev;
634
635 } else {
636 hdev = tctx->hdev;
637 }
638
639 spin_unlock(&img_hash.lock);
640 ctx->hdev = hdev;
641 ctx->flags = 0;
642 ctx->digsize = crypto_ahash_digestsize(tfm);
643
644 switch (ctx->digsize) {
645 case SHA1_DIGEST_SIZE:
646 ctx->flags |= DRIVER_FLAGS_SHA1;
647 break;
648 case SHA256_DIGEST_SIZE:
649 ctx->flags |= DRIVER_FLAGS_SHA256;
650 break;
651 case SHA224_DIGEST_SIZE:
652 ctx->flags |= DRIVER_FLAGS_SHA224;
653 break;
654 case MD5_DIGEST_SIZE:
655 ctx->flags |= DRIVER_FLAGS_MD5;
656 break;
657 default:
658 return -EINVAL;
659 }
660
661 ctx->bufcnt = 0;
662 ctx->offset = 0;
663 ctx->sent = 0;
664 ctx->total = req->nbytes;
665 ctx->sg = req->src;
666 ctx->sgfirst = req->src;
667 ctx->nents = sg_nents(ctx->sg);
668
669 err = img_hash_handle_queue(tctx->hdev, req);
670
671 return err;
672}
673
674static int img_hash_cra_init(struct crypto_tfm *tfm, const char *alg_name)
675{
676 struct img_hash_ctx *ctx = crypto_tfm_ctx(tfm);
677 int err = -ENOMEM;
678
679 ctx->fallback = crypto_alloc_ahash(alg_name, 0,
680 CRYPTO_ALG_NEED_FALLBACK);
681 if (IS_ERR(ctx->fallback)) {
682 pr_err("img_hash: Could not load fallback driver.\n");
683 err = PTR_ERR(ctx->fallback);
684 goto err;
685 }
686 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
687 sizeof(struct img_hash_request_ctx) +
688 crypto_ahash_reqsize(ctx->fallback) +
689 IMG_HASH_DMA_THRESHOLD);
690
691 return 0;
692
693err:
694 return err;
695}
696
697static int img_hash_cra_md5_init(struct crypto_tfm *tfm)
698{
699 return img_hash_cra_init(tfm, "md5-generic");
700}
701
702static int img_hash_cra_sha1_init(struct crypto_tfm *tfm)
703{
704 return img_hash_cra_init(tfm, "sha1-generic");
705}
706
707static int img_hash_cra_sha224_init(struct crypto_tfm *tfm)
708{
709 return img_hash_cra_init(tfm, "sha224-generic");
710}
711
712static int img_hash_cra_sha256_init(struct crypto_tfm *tfm)
713{
714 return img_hash_cra_init(tfm, "sha256-generic");
715}
716
717static void img_hash_cra_exit(struct crypto_tfm *tfm)
718{
719 struct img_hash_ctx *tctx = crypto_tfm_ctx(tfm);
720
721 crypto_free_ahash(tctx->fallback);
722}
723
724static irqreturn_t img_irq_handler(int irq, void *dev_id)
725{
726 struct img_hash_dev *hdev = dev_id;
727 u32 reg;
728
729 reg = img_hash_read(hdev, CR_INTSTAT);
730 img_hash_write(hdev, CR_INTCLEAR, reg);
731
732 if (reg & CR_INT_NEW_RESULTS_SET) {
733 dev_dbg(hdev->dev, "IRQ CR_INT_NEW_RESULTS_SET\n");
734 if (DRIVER_FLAGS_BUSY & hdev->flags) {
735 hdev->flags |= DRIVER_FLAGS_OUTPUT_READY;
736 if (!(DRIVER_FLAGS_CPU & hdev->flags))
737 hdev->flags |= DRIVER_FLAGS_DMA_READY;
738 tasklet_schedule(&hdev->done_task);
739 } else {
740 dev_warn(hdev->dev,
741 "HASH interrupt when no active requests.\n");
742 }
743 } else if (reg & CR_INT_RESULTS_AVAILABLE) {
744 dev_warn(hdev->dev,
745 "IRQ triggered before the hash had completed\n");
746 } else if (reg & CR_INT_RESULT_READ_ERR) {
747 dev_warn(hdev->dev,
748 "Attempt to read from an empty result queue\n");
749 } else if (reg & CR_INT_MESSAGE_WRITE_ERROR) {
750 dev_warn(hdev->dev,
751 "Data written before the hardware was configured\n");
752 }
753 return IRQ_HANDLED;
754}
755
756static struct ahash_alg img_algs[] = {
757 {
758 .init = img_hash_init,
759 .update = img_hash_update,
760 .final = img_hash_final,
761 .finup = img_hash_finup,
762 .export = img_hash_export,
763 .import = img_hash_import,
764 .digest = img_hash_digest,
765 .halg = {
766 .digestsize = MD5_DIGEST_SIZE,
767 .statesize = sizeof(struct md5_state),
768 .base = {
769 .cra_name = "md5",
770 .cra_driver_name = "img-md5",
771 .cra_priority = 300,
772 .cra_flags =
773 CRYPTO_ALG_ASYNC |
774 CRYPTO_ALG_NEED_FALLBACK,
775 .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
776 .cra_ctxsize = sizeof(struct img_hash_ctx),
777 .cra_init = img_hash_cra_md5_init,
778 .cra_exit = img_hash_cra_exit,
779 .cra_module = THIS_MODULE,
780 }
781 }
782 },
783 {
784 .init = img_hash_init,
785 .update = img_hash_update,
786 .final = img_hash_final,
787 .finup = img_hash_finup,
788 .export = img_hash_export,
789 .import = img_hash_import,
790 .digest = img_hash_digest,
791 .halg = {
792 .digestsize = SHA1_DIGEST_SIZE,
793 .statesize = sizeof(struct sha1_state),
794 .base = {
795 .cra_name = "sha1",
796 .cra_driver_name = "img-sha1",
797 .cra_priority = 300,
798 .cra_flags =
799 CRYPTO_ALG_ASYNC |
800 CRYPTO_ALG_NEED_FALLBACK,
801 .cra_blocksize = SHA1_BLOCK_SIZE,
802 .cra_ctxsize = sizeof(struct img_hash_ctx),
803 .cra_init = img_hash_cra_sha1_init,
804 .cra_exit = img_hash_cra_exit,
805 .cra_module = THIS_MODULE,
806 }
807 }
808 },
809 {
810 .init = img_hash_init,
811 .update = img_hash_update,
812 .final = img_hash_final,
813 .finup = img_hash_finup,
814 .export = img_hash_export,
815 .import = img_hash_import,
816 .digest = img_hash_digest,
817 .halg = {
818 .digestsize = SHA224_DIGEST_SIZE,
819 .statesize = sizeof(struct sha256_state),
820 .base = {
821 .cra_name = "sha224",
822 .cra_driver_name = "img-sha224",
823 .cra_priority = 300,
824 .cra_flags =
825 CRYPTO_ALG_ASYNC |
826 CRYPTO_ALG_NEED_FALLBACK,
827 .cra_blocksize = SHA224_BLOCK_SIZE,
828 .cra_ctxsize = sizeof(struct img_hash_ctx),
829 .cra_init = img_hash_cra_sha224_init,
830 .cra_exit = img_hash_cra_exit,
831 .cra_module = THIS_MODULE,
832 }
833 }
834 },
835 {
836 .init = img_hash_init,
837 .update = img_hash_update,
838 .final = img_hash_final,
839 .finup = img_hash_finup,
840 .export = img_hash_export,
841 .import = img_hash_import,
842 .digest = img_hash_digest,
843 .halg = {
844 .digestsize = SHA256_DIGEST_SIZE,
845 .statesize = sizeof(struct sha256_state),
846 .base = {
847 .cra_name = "sha256",
848 .cra_driver_name = "img-sha256",
849 .cra_priority = 300,
850 .cra_flags =
851 CRYPTO_ALG_ASYNC |
852 CRYPTO_ALG_NEED_FALLBACK,
853 .cra_blocksize = SHA256_BLOCK_SIZE,
854 .cra_ctxsize = sizeof(struct img_hash_ctx),
855 .cra_init = img_hash_cra_sha256_init,
856 .cra_exit = img_hash_cra_exit,
857 .cra_module = THIS_MODULE,
858 }
859 }
860 }
861};
862
863static int img_register_algs(struct img_hash_dev *hdev)
864{
865 int i, err;
866
867 for (i = 0; i < ARRAY_SIZE(img_algs); i++) {
868 err = crypto_register_ahash(&img_algs[i]);
869 if (err)
870 goto err_reg;
871 }
872 return 0;
873
874err_reg:
875 for (; i--; )
876 crypto_unregister_ahash(&img_algs[i]);
877
878 return err;
879}
880
881static int img_unregister_algs(struct img_hash_dev *hdev)
882{
883 int i;
884
885 for (i = 0; i < ARRAY_SIZE(img_algs); i++)
886 crypto_unregister_ahash(&img_algs[i]);
887 return 0;
888}
889
890static void img_hash_done_task(unsigned long data)
891{
892 struct img_hash_dev *hdev = (struct img_hash_dev *)data;
893 int err = 0;
894
895 if (hdev->err == -EINVAL) {
896 err = hdev->err;
897 goto finish;
898 }
899
900 if (!(DRIVER_FLAGS_BUSY & hdev->flags)) {
901 img_hash_handle_queue(hdev, NULL);
902 return;
903 }
904
905 if (DRIVER_FLAGS_CPU & hdev->flags) {
906 if (DRIVER_FLAGS_OUTPUT_READY & hdev->flags) {
907 hdev->flags &= ~DRIVER_FLAGS_OUTPUT_READY;
908 goto finish;
909 }
910 } else if (DRIVER_FLAGS_DMA_READY & hdev->flags) {
911 if (DRIVER_FLAGS_DMA_ACTIVE & hdev->flags) {
912 hdev->flags &= ~DRIVER_FLAGS_DMA_ACTIVE;
913 img_hash_write_via_dma_stop(hdev);
914 if (hdev->err) {
915 err = hdev->err;
916 goto finish;
917 }
918 }
919 if (DRIVER_FLAGS_OUTPUT_READY & hdev->flags) {
920 hdev->flags &= ~(DRIVER_FLAGS_DMA_READY |
921 DRIVER_FLAGS_OUTPUT_READY);
922 goto finish;
923 }
924 }
925 return;
926
927finish:
928 img_hash_finish_req(hdev->req, err);
929}
930
931static const struct of_device_id img_hash_match[] = {
932 { .compatible = "img,hash-accelerator" },
933 {}
934};
935MODULE_DEVICE_TABLE(of, img_hash_match);
936
937static int img_hash_probe(struct platform_device *pdev)
938{
939 struct img_hash_dev *hdev;
940 struct device *dev = &pdev->dev;
941 struct resource *hash_res;
942 int irq;
943 int err;
944
945 hdev = devm_kzalloc(dev, sizeof(*hdev), GFP_KERNEL);
946 if (hdev == NULL)
947 return -ENOMEM;
948
949 spin_lock_init(&hdev->lock);
950
951 hdev->dev = dev;
952
953 platform_set_drvdata(pdev, hdev);
954
955 INIT_LIST_HEAD(&hdev->list);
956
957 tasklet_init(&hdev->done_task, img_hash_done_task, (unsigned long)hdev);
958 tasklet_init(&hdev->dma_task, img_hash_dma_task, (unsigned long)hdev);
959
960 crypto_init_queue(&hdev->queue, IMG_HASH_QUEUE_LENGTH);
961
962
963 hdev->io_base = devm_platform_ioremap_resource(pdev, 0);
964 if (IS_ERR(hdev->io_base)) {
965 err = PTR_ERR(hdev->io_base);
966 goto res_err;
967 }
968
969
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 err = PTR_ERR(hdev->cpu_addr);
974 goto res_err;
975 }
976 hdev->bus_addr = hash_res->start;
977
978 irq = platform_get_irq(pdev, 0);
979 if (irq < 0) {
980 err = irq;
981 goto res_err;
982 }
983
984 err = devm_request_irq(dev, irq, img_irq_handler, 0,
985 dev_name(dev), hdev);
986 if (err) {
987 dev_err(dev, "unable to request irq\n");
988 goto res_err;
989 }
990 dev_dbg(dev, "using IRQ channel %d\n", irq);
991
992 hdev->hash_clk = devm_clk_get(&pdev->dev, "hash");
993 if (IS_ERR(hdev->hash_clk)) {
994 dev_err(dev, "clock initialization failed.\n");
995 err = PTR_ERR(hdev->hash_clk);
996 goto res_err;
997 }
998
999 hdev->sys_clk = devm_clk_get(&pdev->dev, "sys");
1000 if (IS_ERR(hdev->sys_clk)) {
1001 dev_err(dev, "clock initialization failed.\n");
1002 err = PTR_ERR(hdev->sys_clk);
1003 goto res_err;
1004 }
1005
1006 err = clk_prepare_enable(hdev->hash_clk);
1007 if (err)
1008 goto res_err;
1009
1010 err = clk_prepare_enable(hdev->sys_clk);
1011 if (err)
1012 goto clk_err;
1013
1014 err = img_hash_dma_init(hdev);
1015 if (err)
1016 goto dma_err;
1017
1018 dev_dbg(dev, "using %s for DMA transfers\n",
1019 dma_chan_name(hdev->dma_lch));
1020
1021 spin_lock(&img_hash.lock);
1022 list_add_tail(&hdev->list, &img_hash.dev_list);
1023 spin_unlock(&img_hash.lock);
1024
1025 err = img_register_algs(hdev);
1026 if (err)
1027 goto err_algs;
1028 dev_info(dev, "Img MD5/SHA1/SHA224/SHA256 Hardware accelerator initialized\n");
1029
1030 return 0;
1031
1032err_algs:
1033 spin_lock(&img_hash.lock);
1034 list_del(&hdev->list);
1035 spin_unlock(&img_hash.lock);
1036 dma_release_channel(hdev->dma_lch);
1037dma_err:
1038 clk_disable_unprepare(hdev->sys_clk);
1039clk_err:
1040 clk_disable_unprepare(hdev->hash_clk);
1041res_err:
1042 tasklet_kill(&hdev->done_task);
1043 tasklet_kill(&hdev->dma_task);
1044
1045 return err;
1046}
1047
1048static int img_hash_remove(struct platform_device *pdev)
1049{
1050 struct img_hash_dev *hdev;
1051
1052 hdev = platform_get_drvdata(pdev);
1053 spin_lock(&img_hash.lock);
1054 list_del(&hdev->list);
1055 spin_unlock(&img_hash.lock);
1056
1057 img_unregister_algs(hdev);
1058
1059 tasklet_kill(&hdev->done_task);
1060 tasklet_kill(&hdev->dma_task);
1061
1062 dma_release_channel(hdev->dma_lch);
1063
1064 clk_disable_unprepare(hdev->hash_clk);
1065 clk_disable_unprepare(hdev->sys_clk);
1066
1067 return 0;
1068}
1069
1070#ifdef CONFIG_PM_SLEEP
1071static int img_hash_suspend(struct device *dev)
1072{
1073 struct img_hash_dev *hdev = dev_get_drvdata(dev);
1074
1075 clk_disable_unprepare(hdev->hash_clk);
1076 clk_disable_unprepare(hdev->sys_clk);
1077
1078 return 0;
1079}
1080
1081static int img_hash_resume(struct device *dev)
1082{
1083 struct img_hash_dev *hdev = dev_get_drvdata(dev);
1084 int ret;
1085
1086 ret = clk_prepare_enable(hdev->hash_clk);
1087 if (ret)
1088 return ret;
1089
1090 ret = clk_prepare_enable(hdev->sys_clk);
1091 if (ret) {
1092 clk_disable_unprepare(hdev->hash_clk);
1093 return ret;
1094 }
1095
1096 return 0;
1097}
1098#endif
1099
1100static const struct dev_pm_ops img_hash_pm_ops = {
1101 SET_SYSTEM_SLEEP_PM_OPS(img_hash_suspend, img_hash_resume)
1102};
1103
1104static struct platform_driver img_hash_driver = {
1105 .probe = img_hash_probe,
1106 .remove = img_hash_remove,
1107 .driver = {
1108 .name = "img-hash-accelerator",
1109 .pm = &img_hash_pm_ops,
1110 .of_match_table = of_match_ptr(img_hash_match),
1111 }
1112};
1113module_platform_driver(img_hash_driver);
1114
1115MODULE_LICENSE("GPL v2");
1116MODULE_DESCRIPTION("Imgtec SHA1/224/256 & MD5 hw accelerator driver");
1117MODULE_AUTHOR("Will Thomas.");
1118MODULE_AUTHOR("James Hartley <james.hartley@imgtec.com>");
1119
