2 * Freescale i.MX23/i.MX28 Data Co-Processor driver
4 * Copyright (C) 2013 Marek Vasut <marex@denx.de>
6 * The code contained herein is licensed under the GNU General Public
7 * License. You may obtain a copy of the GNU General Public License
8 * Version 2 or later at the following locations:
10 * http://www.opensource.org/licenses/gpl-license.html
11 * http://www.gnu.org/copyleft/gpl.html
14 #include <linux/crypto.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/interrupt.h>
18 #include <linux/kernel.h>
19 #include <linux/kthread.h>
20 #include <linux/module.h>
22 #include <linux/platform_device.h>
23 #include <linux/stmp_device.h>
25 #include <crypto/aes.h>
26 #include <crypto/sha.h>
27 #include <crypto/internal/hash.h>
29 #define DCP_MAX_CHANS 4
30 #define DCP_BUF_SZ PAGE_SIZE
32 /* DCP DMA descriptor. */
34 uint32_t next_cmd_addr;
44 /* Coherent aligned block for bounce buffering. */
45 struct dcp_coherent_block {
46 uint8_t aes_in_buf[DCP_BUF_SZ];
47 uint8_t aes_out_buf[DCP_BUF_SZ];
48 uint8_t sha_in_buf[DCP_BUF_SZ];
50 uint8_t aes_key[2 * AES_KEYSIZE_128];
51 uint8_t sha_digest[SHA256_DIGEST_SIZE];
53 struct dcp_dma_desc desc[DCP_MAX_CHANS];
62 struct dcp_coherent_block *coh;
64 struct completion completion[DCP_MAX_CHANS];
65 struct mutex mutex[DCP_MAX_CHANS];
66 struct task_struct *thread[DCP_MAX_CHANS];
67 struct crypto_queue queue[DCP_MAX_CHANS];
71 DCP_CHAN_HASH_SHA = 0,
75 struct dcp_async_ctx {
80 /* SHA Hash-specific context */
85 /* Crypto-specific context */
86 struct crypto_ablkcipher *fallback;
88 uint8_t key[AES_KEYSIZE_128];
91 struct dcp_aes_req_ctx {
96 struct dcp_sha_req_ctx {
102 * There can even be only one instance of the MXS DCP due to the
103 * design of Linux Crypto API.
105 static struct dcp *global_sdcp;
106 static DEFINE_MUTEX(global_mutex);
108 /* DCP register layout. */
109 #define MXS_DCP_CTRL 0x00
110 #define MXS_DCP_CTRL_GATHER_RESIDUAL_WRITES (1 << 23)
111 #define MXS_DCP_CTRL_ENABLE_CONTEXT_CACHING (1 << 22)
113 #define MXS_DCP_STAT 0x10
114 #define MXS_DCP_STAT_CLR 0x18
115 #define MXS_DCP_STAT_IRQ_MASK 0xf
117 #define MXS_DCP_CHANNELCTRL 0x20
118 #define MXS_DCP_CHANNELCTRL_ENABLE_CHANNEL_MASK 0xff
120 #define MXS_DCP_CAPABILITY1 0x40
121 #define MXS_DCP_CAPABILITY1_SHA256 (4 << 16)
122 #define MXS_DCP_CAPABILITY1_SHA1 (1 << 16)
123 #define MXS_DCP_CAPABILITY1_AES128 (1 << 0)
125 #define MXS_DCP_CONTEXT 0x50
127 #define MXS_DCP_CH_N_CMDPTR(n) (0x100 + ((n) * 0x40))
129 #define MXS_DCP_CH_N_SEMA(n) (0x110 + ((n) * 0x40))
131 #define MXS_DCP_CH_N_STAT(n) (0x120 + ((n) * 0x40))
132 #define MXS_DCP_CH_N_STAT_CLR(n) (0x128 + ((n) * 0x40))
134 /* DMA descriptor bits. */
135 #define MXS_DCP_CONTROL0_HASH_TERM (1 << 13)
136 #define MXS_DCP_CONTROL0_HASH_INIT (1 << 12)
137 #define MXS_DCP_CONTROL0_PAYLOAD_KEY (1 << 11)
138 #define MXS_DCP_CONTROL0_CIPHER_ENCRYPT (1 << 8)
139 #define MXS_DCP_CONTROL0_CIPHER_INIT (1 << 9)
140 #define MXS_DCP_CONTROL0_ENABLE_HASH (1 << 6)
141 #define MXS_DCP_CONTROL0_ENABLE_CIPHER (1 << 5)
142 #define MXS_DCP_CONTROL0_DECR_SEMAPHORE (1 << 1)
143 #define MXS_DCP_CONTROL0_INTERRUPT (1 << 0)
145 #define MXS_DCP_CONTROL1_HASH_SELECT_SHA256 (2 << 16)
146 #define MXS_DCP_CONTROL1_HASH_SELECT_SHA1 (0 << 16)
147 #define MXS_DCP_CONTROL1_CIPHER_MODE_CBC (1 << 4)
148 #define MXS_DCP_CONTROL1_CIPHER_MODE_ECB (0 << 4)
149 #define MXS_DCP_CONTROL1_CIPHER_SELECT_AES128 (0 << 0)
151 static int mxs_dcp_start_dma(struct dcp_async_ctx *actx)
153 struct dcp *sdcp = global_sdcp;
154 const int chan = actx->chan;
157 struct dcp_dma_desc *desc = &sdcp->coh->desc[actx->chan];
159 dma_addr_t desc_phys = dma_map_single(sdcp->dev, desc, sizeof(*desc),
162 reinit_completion(&sdcp->completion[chan]);
164 /* Clear status register. */
165 writel(0xffffffff, sdcp->base + MXS_DCP_CH_N_STAT_CLR(chan));
167 /* Load the DMA descriptor. */
168 writel(desc_phys, sdcp->base + MXS_DCP_CH_N_CMDPTR(chan));
170 /* Increment the semaphore to start the DMA transfer. */
171 writel(1, sdcp->base + MXS_DCP_CH_N_SEMA(chan));
173 ret = wait_for_completion_timeout(&sdcp->completion[chan],
174 msecs_to_jiffies(1000));
176 dev_err(sdcp->dev, "Channel %i timeout (DCP_STAT=0x%08x)\n",
177 chan, readl(sdcp->base + MXS_DCP_STAT));
181 stat = readl(sdcp->base + MXS_DCP_CH_N_STAT(chan));
183 dev_err(sdcp->dev, "Channel %i error (CH_STAT=0x%08x)\n",
188 dma_unmap_single(sdcp->dev, desc_phys, sizeof(*desc), DMA_TO_DEVICE);
194 * Encryption (AES128)
196 static int mxs_dcp_run_aes(struct dcp_async_ctx *actx,
197 struct ablkcipher_request *req, int init)
199 struct dcp *sdcp = global_sdcp;
200 struct dcp_dma_desc *desc = &sdcp->coh->desc[actx->chan];
201 struct dcp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
204 dma_addr_t key_phys = dma_map_single(sdcp->dev, sdcp->coh->aes_key,
207 dma_addr_t src_phys = dma_map_single(sdcp->dev, sdcp->coh->aes_in_buf,
208 DCP_BUF_SZ, DMA_TO_DEVICE);
209 dma_addr_t dst_phys = dma_map_single(sdcp->dev, sdcp->coh->aes_out_buf,
210 DCP_BUF_SZ, DMA_FROM_DEVICE);
212 /* Fill in the DMA descriptor. */
213 desc->control0 = MXS_DCP_CONTROL0_DECR_SEMAPHORE |
214 MXS_DCP_CONTROL0_INTERRUPT |
215 MXS_DCP_CONTROL0_ENABLE_CIPHER;
217 /* Payload contains the key. */
218 desc->control0 |= MXS_DCP_CONTROL0_PAYLOAD_KEY;
221 desc->control0 |= MXS_DCP_CONTROL0_CIPHER_ENCRYPT;
223 desc->control0 |= MXS_DCP_CONTROL0_CIPHER_INIT;
225 desc->control1 = MXS_DCP_CONTROL1_CIPHER_SELECT_AES128;
228 desc->control1 |= MXS_DCP_CONTROL1_CIPHER_MODE_ECB;
230 desc->control1 |= MXS_DCP_CONTROL1_CIPHER_MODE_CBC;
232 desc->next_cmd_addr = 0;
233 desc->source = src_phys;
234 desc->destination = dst_phys;
235 desc->size = actx->fill;
236 desc->payload = key_phys;
239 ret = mxs_dcp_start_dma(actx);
241 dma_unmap_single(sdcp->dev, key_phys, 2 * AES_KEYSIZE_128,
243 dma_unmap_single(sdcp->dev, src_phys, DCP_BUF_SZ, DMA_TO_DEVICE);
244 dma_unmap_single(sdcp->dev, dst_phys, DCP_BUF_SZ, DMA_FROM_DEVICE);
249 static int mxs_dcp_aes_block_crypt(struct crypto_async_request *arq)
251 struct dcp *sdcp = global_sdcp;
253 struct ablkcipher_request *req = ablkcipher_request_cast(arq);
254 struct dcp_async_ctx *actx = crypto_tfm_ctx(arq->tfm);
255 struct dcp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
257 struct scatterlist *dst = req->dst;
258 struct scatterlist *src = req->src;
259 const int nents = sg_nents(req->src);
261 const int out_off = DCP_BUF_SZ;
262 uint8_t *in_buf = sdcp->coh->aes_in_buf;
263 uint8_t *out_buf = sdcp->coh->aes_out_buf;
265 uint8_t *out_tmp, *src_buf, *dst_buf = NULL;
266 uint32_t dst_off = 0;
268 uint8_t *key = sdcp->coh->aes_key;
272 unsigned int i, len, clen, rem = 0;
277 /* Copy the key from the temporary location. */
278 memcpy(key, actx->key, actx->key_len);
281 /* Copy the CBC IV just past the key. */
282 memcpy(key + AES_KEYSIZE_128, req->info, AES_KEYSIZE_128);
283 /* CBC needs the INIT set. */
286 memset(key + AES_KEYSIZE_128, 0, AES_KEYSIZE_128);
289 for_each_sg(req->src, src, nents, i) {
290 src_buf = sg_virt(src);
291 len = sg_dma_len(src);
294 if (actx->fill + len > out_off)
295 clen = out_off - actx->fill;
299 memcpy(in_buf + actx->fill, src_buf, clen);
305 * If we filled the buffer or this is the last SG,
308 if (actx->fill == out_off || sg_is_last(src)) {
309 ret = mxs_dcp_run_aes(actx, req, init);
315 while (dst && actx->fill) {
317 dst_buf = sg_virt(dst);
320 rem = min(sg_dma_len(dst) - dst_off,
323 memcpy(dst_buf + dst_off, out_tmp, rem);
328 if (dst_off == sg_dma_len(dst)) {
342 static int dcp_chan_thread_aes(void *data)
344 struct dcp *sdcp = global_sdcp;
345 const int chan = DCP_CHAN_CRYPTO;
347 struct crypto_async_request *backlog;
348 struct crypto_async_request *arq;
353 __set_current_state(TASK_INTERRUPTIBLE);
355 mutex_lock(&sdcp->mutex[chan]);
356 backlog = crypto_get_backlog(&sdcp->queue[chan]);
357 arq = crypto_dequeue_request(&sdcp->queue[chan]);
358 mutex_unlock(&sdcp->mutex[chan]);
361 backlog->complete(backlog, -EINPROGRESS);
364 ret = mxs_dcp_aes_block_crypt(arq);
365 arq->complete(arq, ret);
370 } while (!kthread_should_stop());
375 static int mxs_dcp_block_fallback(struct ablkcipher_request *req, int enc)
377 struct crypto_tfm *tfm =
378 crypto_ablkcipher_tfm(crypto_ablkcipher_reqtfm(req));
379 struct dcp_async_ctx *ctx = crypto_ablkcipher_ctx(
380 crypto_ablkcipher_reqtfm(req));
383 ablkcipher_request_set_tfm(req, ctx->fallback);
386 ret = crypto_ablkcipher_encrypt(req);
388 ret = crypto_ablkcipher_decrypt(req);
390 ablkcipher_request_set_tfm(req, __crypto_ablkcipher_cast(tfm));
395 static int mxs_dcp_aes_enqueue(struct ablkcipher_request *req, int enc, int ecb)
397 struct dcp *sdcp = global_sdcp;
398 struct crypto_async_request *arq = &req->base;
399 struct dcp_async_ctx *actx = crypto_tfm_ctx(arq->tfm);
400 struct dcp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
403 if (unlikely(actx->key_len != AES_KEYSIZE_128))
404 return mxs_dcp_block_fallback(req, enc);
408 actx->chan = DCP_CHAN_CRYPTO;
410 mutex_lock(&sdcp->mutex[actx->chan]);
411 ret = crypto_enqueue_request(&sdcp->queue[actx->chan], &req->base);
412 mutex_unlock(&sdcp->mutex[actx->chan]);
414 wake_up_process(sdcp->thread[actx->chan]);
419 static int mxs_dcp_aes_ecb_decrypt(struct ablkcipher_request *req)
421 return mxs_dcp_aes_enqueue(req, 0, 1);
424 static int mxs_dcp_aes_ecb_encrypt(struct ablkcipher_request *req)
426 return mxs_dcp_aes_enqueue(req, 1, 1);
429 static int mxs_dcp_aes_cbc_decrypt(struct ablkcipher_request *req)
431 return mxs_dcp_aes_enqueue(req, 0, 0);
434 static int mxs_dcp_aes_cbc_encrypt(struct ablkcipher_request *req)
436 return mxs_dcp_aes_enqueue(req, 1, 0);
439 static int mxs_dcp_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
442 struct dcp_async_ctx *actx = crypto_ablkcipher_ctx(tfm);
446 * AES 128 is supposed by the hardware, store key into temporary
447 * buffer and exit. We must use the temporary buffer here, since
448 * there can still be an operation in progress.
451 if (len == AES_KEYSIZE_128) {
452 memcpy(actx->key, key, len);
456 /* Check if the key size is supported by kernel at all. */
457 if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
458 tfm->base.crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
463 * If the requested AES key size is not supported by the hardware,
464 * but is supported by in-kernel software implementation, we use
467 actx->fallback->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
468 actx->fallback->base.crt_flags |=
469 tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK;
471 ret = crypto_ablkcipher_setkey(actx->fallback, key, len);
475 tfm->base.crt_flags &= ~CRYPTO_TFM_RES_MASK;
476 tfm->base.crt_flags |=
477 actx->fallback->base.crt_flags & CRYPTO_TFM_RES_MASK;
482 static int mxs_dcp_aes_fallback_init(struct crypto_tfm *tfm)
484 const char *name = tfm->__crt_alg->cra_name;
485 const uint32_t flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK;
486 struct dcp_async_ctx *actx = crypto_tfm_ctx(tfm);
487 struct crypto_ablkcipher *blk;
489 blk = crypto_alloc_ablkcipher(name, 0, flags);
493 actx->fallback = blk;
494 tfm->crt_ablkcipher.reqsize = sizeof(struct dcp_aes_req_ctx);
498 static void mxs_dcp_aes_fallback_exit(struct crypto_tfm *tfm)
500 struct dcp_async_ctx *actx = crypto_tfm_ctx(tfm);
502 crypto_free_ablkcipher(actx->fallback);
503 actx->fallback = NULL;
507 * Hashing (SHA1/SHA256)
509 static int mxs_dcp_run_sha(struct ahash_request *req)
511 struct dcp *sdcp = global_sdcp;
514 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
515 struct dcp_async_ctx *actx = crypto_ahash_ctx(tfm);
516 struct dcp_sha_req_ctx *rctx = ahash_request_ctx(req);
518 struct dcp_dma_desc *desc = &sdcp->coh->desc[actx->chan];
519 dma_addr_t digest_phys = dma_map_single(sdcp->dev,
520 sdcp->coh->sha_digest,
524 dma_addr_t buf_phys = dma_map_single(sdcp->dev, sdcp->coh->sha_in_buf,
525 DCP_BUF_SZ, DMA_TO_DEVICE);
527 /* Fill in the DMA descriptor. */
528 desc->control0 = MXS_DCP_CONTROL0_DECR_SEMAPHORE |
529 MXS_DCP_CONTROL0_INTERRUPT |
530 MXS_DCP_CONTROL0_ENABLE_HASH;
532 desc->control0 |= MXS_DCP_CONTROL0_HASH_INIT;
534 desc->control1 = actx->alg;
535 desc->next_cmd_addr = 0;
536 desc->source = buf_phys;
537 desc->destination = 0;
538 desc->size = actx->fill;
542 /* Set HASH_TERM bit for last transfer block. */
544 desc->control0 |= MXS_DCP_CONTROL0_HASH_TERM;
545 desc->payload = digest_phys;
548 ret = mxs_dcp_start_dma(actx);
550 dma_unmap_single(sdcp->dev, digest_phys, SHA256_DIGEST_SIZE,
552 dma_unmap_single(sdcp->dev, buf_phys, DCP_BUF_SZ, DMA_TO_DEVICE);
557 static int dcp_sha_req_to_buf(struct crypto_async_request *arq)
559 struct dcp *sdcp = global_sdcp;
561 struct ahash_request *req = ahash_request_cast(arq);
562 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
563 struct dcp_async_ctx *actx = crypto_ahash_ctx(tfm);
564 struct dcp_sha_req_ctx *rctx = ahash_request_ctx(req);
565 struct hash_alg_common *halg = crypto_hash_alg_common(tfm);
566 const int nents = sg_nents(req->src);
568 uint8_t *digest = sdcp->coh->sha_digest;
569 uint8_t *in_buf = sdcp->coh->sha_in_buf;
573 struct scatterlist *src;
575 unsigned int i, len, clen;
578 int fin = rctx->fini;
582 for_each_sg(req->src, src, nents, i) {
583 src_buf = sg_virt(src);
584 len = sg_dma_len(src);
587 if (actx->fill + len > DCP_BUF_SZ)
588 clen = DCP_BUF_SZ - actx->fill;
592 memcpy(in_buf + actx->fill, src_buf, clen);
598 * If we filled the buffer and still have some
599 * more data, submit the buffer.
601 if (len && actx->fill == DCP_BUF_SZ) {
602 ret = mxs_dcp_run_sha(req);
614 /* Submit whatever is left. */
615 ret = mxs_dcp_run_sha(req);
616 if (ret || !req->result)
620 /* For some reason, the result is flipped. */
621 for (i = 0; i < halg->digestsize; i++)
622 req->result[i] = digest[halg->digestsize - i - 1];
628 static int dcp_chan_thread_sha(void *data)
630 struct dcp *sdcp = global_sdcp;
631 const int chan = DCP_CHAN_HASH_SHA;
633 struct crypto_async_request *backlog;
634 struct crypto_async_request *arq;
636 struct dcp_sha_req_ctx *rctx;
638 struct ahash_request *req;
642 __set_current_state(TASK_INTERRUPTIBLE);
644 mutex_lock(&sdcp->mutex[chan]);
645 backlog = crypto_get_backlog(&sdcp->queue[chan]);
646 arq = crypto_dequeue_request(&sdcp->queue[chan]);
647 mutex_unlock(&sdcp->mutex[chan]);
650 backlog->complete(backlog, -EINPROGRESS);
653 req = ahash_request_cast(arq);
654 rctx = ahash_request_ctx(req);
656 ret = dcp_sha_req_to_buf(arq);
658 arq->complete(arq, ret);
664 } while (!kthread_should_stop());
669 static int dcp_sha_init(struct ahash_request *req)
671 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
672 struct dcp_async_ctx *actx = crypto_ahash_ctx(tfm);
674 struct hash_alg_common *halg = crypto_hash_alg_common(tfm);
677 * Start hashing session. The code below only inits the
678 * hashing session context, nothing more.
680 memset(actx, 0, sizeof(*actx));
682 if (strcmp(halg->base.cra_name, "sha1") == 0)
683 actx->alg = MXS_DCP_CONTROL1_HASH_SELECT_SHA1;
685 actx->alg = MXS_DCP_CONTROL1_HASH_SELECT_SHA256;
689 actx->chan = DCP_CHAN_HASH_SHA;
691 mutex_init(&actx->mutex);
696 static int dcp_sha_update_fx(struct ahash_request *req, int fini)
698 struct dcp *sdcp = global_sdcp;
700 struct dcp_sha_req_ctx *rctx = ahash_request_ctx(req);
701 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
702 struct dcp_async_ctx *actx = crypto_ahash_ctx(tfm);
707 * Ignore requests that have no data in them and are not
708 * the trailing requests in the stream of requests.
710 if (!req->nbytes && !fini)
713 mutex_lock(&actx->mutex);
722 mutex_lock(&sdcp->mutex[actx->chan]);
723 ret = crypto_enqueue_request(&sdcp->queue[actx->chan], &req->base);
724 mutex_unlock(&sdcp->mutex[actx->chan]);
726 wake_up_process(sdcp->thread[actx->chan]);
727 mutex_unlock(&actx->mutex);
732 static int dcp_sha_update(struct ahash_request *req)
734 return dcp_sha_update_fx(req, 0);
737 static int dcp_sha_final(struct ahash_request *req)
739 ahash_request_set_crypt(req, NULL, req->result, 0);
741 return dcp_sha_update_fx(req, 1);
744 static int dcp_sha_finup(struct ahash_request *req)
746 return dcp_sha_update_fx(req, 1);
749 static int dcp_sha_digest(struct ahash_request *req)
753 ret = dcp_sha_init(req);
757 return dcp_sha_finup(req);
760 static int dcp_sha_cra_init(struct crypto_tfm *tfm)
762 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
763 sizeof(struct dcp_sha_req_ctx));
767 static void dcp_sha_cra_exit(struct crypto_tfm *tfm)
771 /* AES 128 ECB and AES 128 CBC */
772 static struct crypto_alg dcp_aes_algs[] = {
774 .cra_name = "ecb(aes)",
775 .cra_driver_name = "ecb-aes-dcp",
778 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
780 CRYPTO_ALG_NEED_FALLBACK,
781 .cra_init = mxs_dcp_aes_fallback_init,
782 .cra_exit = mxs_dcp_aes_fallback_exit,
783 .cra_blocksize = AES_BLOCK_SIZE,
784 .cra_ctxsize = sizeof(struct dcp_async_ctx),
785 .cra_type = &crypto_ablkcipher_type,
786 .cra_module = THIS_MODULE,
789 .min_keysize = AES_MIN_KEY_SIZE,
790 .max_keysize = AES_MAX_KEY_SIZE,
791 .setkey = mxs_dcp_aes_setkey,
792 .encrypt = mxs_dcp_aes_ecb_encrypt,
793 .decrypt = mxs_dcp_aes_ecb_decrypt
797 .cra_name = "cbc(aes)",
798 .cra_driver_name = "cbc-aes-dcp",
801 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
803 CRYPTO_ALG_NEED_FALLBACK,
804 .cra_init = mxs_dcp_aes_fallback_init,
805 .cra_exit = mxs_dcp_aes_fallback_exit,
806 .cra_blocksize = AES_BLOCK_SIZE,
807 .cra_ctxsize = sizeof(struct dcp_async_ctx),
808 .cra_type = &crypto_ablkcipher_type,
809 .cra_module = THIS_MODULE,
812 .min_keysize = AES_MIN_KEY_SIZE,
813 .max_keysize = AES_MAX_KEY_SIZE,
814 .setkey = mxs_dcp_aes_setkey,
815 .encrypt = mxs_dcp_aes_cbc_encrypt,
816 .decrypt = mxs_dcp_aes_cbc_decrypt,
817 .ivsize = AES_BLOCK_SIZE,
824 static struct ahash_alg dcp_sha1_alg = {
825 .init = dcp_sha_init,
826 .update = dcp_sha_update,
827 .final = dcp_sha_final,
828 .finup = dcp_sha_finup,
829 .digest = dcp_sha_digest,
831 .digestsize = SHA1_DIGEST_SIZE,
834 .cra_driver_name = "sha1-dcp",
837 .cra_flags = CRYPTO_ALG_ASYNC,
838 .cra_blocksize = SHA1_BLOCK_SIZE,
839 .cra_ctxsize = sizeof(struct dcp_async_ctx),
840 .cra_module = THIS_MODULE,
841 .cra_init = dcp_sha_cra_init,
842 .cra_exit = dcp_sha_cra_exit,
848 static struct ahash_alg dcp_sha256_alg = {
849 .init = dcp_sha_init,
850 .update = dcp_sha_update,
851 .final = dcp_sha_final,
852 .finup = dcp_sha_finup,
853 .digest = dcp_sha_digest,
855 .digestsize = SHA256_DIGEST_SIZE,
857 .cra_name = "sha256",
858 .cra_driver_name = "sha256-dcp",
861 .cra_flags = CRYPTO_ALG_ASYNC,
862 .cra_blocksize = SHA256_BLOCK_SIZE,
863 .cra_ctxsize = sizeof(struct dcp_async_ctx),
864 .cra_module = THIS_MODULE,
865 .cra_init = dcp_sha_cra_init,
866 .cra_exit = dcp_sha_cra_exit,
871 static irqreturn_t mxs_dcp_irq(int irq, void *context)
873 struct dcp *sdcp = context;
877 stat = readl(sdcp->base + MXS_DCP_STAT);
878 stat &= MXS_DCP_STAT_IRQ_MASK;
882 /* Clear the interrupts. */
883 writel(stat, sdcp->base + MXS_DCP_STAT_CLR);
885 /* Complete the DMA requests that finished. */
886 for (i = 0; i < DCP_MAX_CHANS; i++)
888 complete(&sdcp->completion[i]);
893 static int mxs_dcp_probe(struct platform_device *pdev)
895 struct device *dev = &pdev->dev;
896 struct dcp *sdcp = NULL;
899 struct resource *iores;
900 int dcp_vmi_irq, dcp_irq;
902 mutex_lock(&global_mutex);
904 dev_err(dev, "Only one DCP instance allowed!\n");
909 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
910 dcp_vmi_irq = platform_get_irq(pdev, 0);
911 if (dcp_vmi_irq < 0) {
916 dcp_irq = platform_get_irq(pdev, 1);
922 sdcp = devm_kzalloc(dev, sizeof(*sdcp), GFP_KERNEL);
929 sdcp->base = devm_ioremap_resource(dev, iores);
930 if (IS_ERR(sdcp->base)) {
931 ret = PTR_ERR(sdcp->base);
935 ret = devm_request_irq(dev, dcp_vmi_irq, mxs_dcp_irq, 0,
936 "dcp-vmi-irq", sdcp);
938 dev_err(dev, "Failed to claim DCP VMI IRQ!\n");
942 ret = devm_request_irq(dev, dcp_irq, mxs_dcp_irq, 0,
945 dev_err(dev, "Failed to claim DCP IRQ!\n");
949 /* Allocate coherent helper block. */
950 sdcp->coh = devm_kzalloc(dev, sizeof(*sdcp->coh), GFP_KERNEL);
956 /* Restart the DCP block. */
957 ret = stmp_reset_block(sdcp->base);
961 /* Initialize control register. */
962 writel(MXS_DCP_CTRL_GATHER_RESIDUAL_WRITES |
963 MXS_DCP_CTRL_ENABLE_CONTEXT_CACHING | 0xf,
964 sdcp->base + MXS_DCP_CTRL);
966 /* Enable all DCP DMA channels. */
967 writel(MXS_DCP_CHANNELCTRL_ENABLE_CHANNEL_MASK,
968 sdcp->base + MXS_DCP_CHANNELCTRL);
971 * We do not enable context switching. Give the context buffer a
972 * pointer to an illegal address so if context switching is
973 * inadvertantly enabled, the DCP will return an error instead of
974 * trashing good memory. The DCP DMA cannot access ROM, so any ROM
977 writel(0xffff0000, sdcp->base + MXS_DCP_CONTEXT);
978 for (i = 0; i < DCP_MAX_CHANS; i++)
979 writel(0xffffffff, sdcp->base + MXS_DCP_CH_N_STAT_CLR(i));
980 writel(0xffffffff, sdcp->base + MXS_DCP_STAT_CLR);
984 platform_set_drvdata(pdev, sdcp);
986 for (i = 0; i < DCP_MAX_CHANS; i++) {
987 mutex_init(&sdcp->mutex[i]);
988 init_completion(&sdcp->completion[i]);
989 crypto_init_queue(&sdcp->queue[i], 50);
992 /* Create the SHA and AES handler threads. */
993 sdcp->thread[DCP_CHAN_HASH_SHA] = kthread_run(dcp_chan_thread_sha,
994 NULL, "mxs_dcp_chan/sha");
995 if (IS_ERR(sdcp->thread[DCP_CHAN_HASH_SHA])) {
996 dev_err(dev, "Error starting SHA thread!\n");
997 ret = PTR_ERR(sdcp->thread[DCP_CHAN_HASH_SHA]);
1001 sdcp->thread[DCP_CHAN_CRYPTO] = kthread_run(dcp_chan_thread_aes,
1002 NULL, "mxs_dcp_chan/aes");
1003 if (IS_ERR(sdcp->thread[DCP_CHAN_CRYPTO])) {
1004 dev_err(dev, "Error starting SHA thread!\n");
1005 ret = PTR_ERR(sdcp->thread[DCP_CHAN_CRYPTO]);
1006 goto err_destroy_sha_thread;
1009 /* Register the various crypto algorithms. */
1010 sdcp->caps = readl(sdcp->base + MXS_DCP_CAPABILITY1);
1012 if (sdcp->caps & MXS_DCP_CAPABILITY1_AES128) {
1013 ret = crypto_register_algs(dcp_aes_algs,
1014 ARRAY_SIZE(dcp_aes_algs));
1016 /* Failed to register algorithm. */
1017 dev_err(dev, "Failed to register AES crypto!\n");
1018 goto err_destroy_aes_thread;
1022 if (sdcp->caps & MXS_DCP_CAPABILITY1_SHA1) {
1023 ret = crypto_register_ahash(&dcp_sha1_alg);
1025 dev_err(dev, "Failed to register %s hash!\n",
1026 dcp_sha1_alg.halg.base.cra_name);
1027 goto err_unregister_aes;
1031 if (sdcp->caps & MXS_DCP_CAPABILITY1_SHA256) {
1032 ret = crypto_register_ahash(&dcp_sha256_alg);
1034 dev_err(dev, "Failed to register %s hash!\n",
1035 dcp_sha256_alg.halg.base.cra_name);
1036 goto err_unregister_sha1;
1042 err_unregister_sha1:
1043 if (sdcp->caps & MXS_DCP_CAPABILITY1_SHA1)
1044 crypto_unregister_ahash(&dcp_sha1_alg);
1047 if (sdcp->caps & MXS_DCP_CAPABILITY1_AES128)
1048 crypto_unregister_algs(dcp_aes_algs, ARRAY_SIZE(dcp_aes_algs));
1050 err_destroy_aes_thread:
1051 kthread_stop(sdcp->thread[DCP_CHAN_CRYPTO]);
1053 err_destroy_sha_thread:
1054 kthread_stop(sdcp->thread[DCP_CHAN_HASH_SHA]);
1057 mutex_unlock(&global_mutex);
1061 static int mxs_dcp_remove(struct platform_device *pdev)
1063 struct dcp *sdcp = platform_get_drvdata(pdev);
1065 if (sdcp->caps & MXS_DCP_CAPABILITY1_SHA256)
1066 crypto_unregister_ahash(&dcp_sha256_alg);
1068 if (sdcp->caps & MXS_DCP_CAPABILITY1_SHA1)
1069 crypto_unregister_ahash(&dcp_sha1_alg);
1071 if (sdcp->caps & MXS_DCP_CAPABILITY1_AES128)
1072 crypto_unregister_algs(dcp_aes_algs, ARRAY_SIZE(dcp_aes_algs));
1074 kthread_stop(sdcp->thread[DCP_CHAN_HASH_SHA]);
1075 kthread_stop(sdcp->thread[DCP_CHAN_CRYPTO]);
1077 platform_set_drvdata(pdev, NULL);
1079 mutex_lock(&global_mutex);
1081 mutex_unlock(&global_mutex);
1086 static const struct of_device_id mxs_dcp_dt_ids[] = {
1087 { .compatible = "fsl,imx23-dcp", .data = NULL, },
1088 { .compatible = "fsl,imx28-dcp", .data = NULL, },
1092 MODULE_DEVICE_TABLE(of, mxs_dcp_dt_ids);
1094 static struct platform_driver mxs_dcp_driver = {
1095 .probe = mxs_dcp_probe,
1096 .remove = mxs_dcp_remove,
1099 .owner = THIS_MODULE,
1100 .of_match_table = mxs_dcp_dt_ids,
1104 module_platform_driver(mxs_dcp_driver);
1106 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
1107 MODULE_DESCRIPTION("Freescale MXS DCP Driver");
1108 MODULE_LICENSE("GPL");
1109 MODULE_ALIAS("platform:mxs-dcp");