4 * Support for OMAP SHA1/MD5 HW acceleration.
6 * Copyright (c) 2010 Nokia Corporation
7 * Author: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as published
11 * by the Free Software Foundation.
13 * Some ideas are from old omap-sha1-md5.c driver.
16 #define pr_fmt(fmt) "%s: " fmt, __func__
18 #include <linux/err.h>
19 #include <linux/device.h>
20 #include <linux/module.h>
21 #include <linux/init.h>
22 #include <linux/errno.h>
23 #include <linux/interrupt.h>
24 #include <linux/kernel.h>
25 #include <linux/clk.h>
26 #include <linux/irq.h>
28 #include <linux/platform_device.h>
29 #include <linux/scatterlist.h>
30 #include <linux/dma-mapping.h>
31 #include <linux/delay.h>
32 #include <linux/crypto.h>
33 #include <linux/cryptohash.h>
34 #include <crypto/scatterwalk.h>
35 #include <crypto/algapi.h>
36 #include <crypto/sha.h>
37 #include <crypto/hash.h>
38 #include <crypto/internal/hash.h>
42 #include <mach/irqs.h>
44 #define SHA_REG_DIGEST(x) (0x00 + ((x) * 0x04))
45 #define SHA_REG_DIN(x) (0x1C + ((x) * 0x04))
47 #define SHA1_MD5_BLOCK_SIZE SHA1_BLOCK_SIZE
48 #define MD5_DIGEST_SIZE 16
50 #define SHA_REG_DIGCNT 0x14
52 #define SHA_REG_CTRL 0x18
53 #define SHA_REG_CTRL_LENGTH (0xFFFFFFFF << 5)
54 #define SHA_REG_CTRL_CLOSE_HASH (1 << 4)
55 #define SHA_REG_CTRL_ALGO_CONST (1 << 3)
56 #define SHA_REG_CTRL_ALGO (1 << 2)
57 #define SHA_REG_CTRL_INPUT_READY (1 << 1)
58 #define SHA_REG_CTRL_OUTPUT_READY (1 << 0)
60 #define SHA_REG_REV 0x5C
61 #define SHA_REG_REV_MAJOR 0xF0
62 #define SHA_REG_REV_MINOR 0x0F
64 #define SHA_REG_MASK 0x60
65 #define SHA_REG_MASK_DMA_EN (1 << 3)
66 #define SHA_REG_MASK_IT_EN (1 << 2)
67 #define SHA_REG_MASK_SOFTRESET (1 << 1)
68 #define SHA_REG_AUTOIDLE (1 << 0)
70 #define SHA_REG_SYSSTATUS 0x64
71 #define SHA_REG_SYSSTATUS_RESETDONE (1 << 0)
73 #define DEFAULT_TIMEOUT_INTERVAL HZ
75 #define FLAGS_FIRST 0x0001
76 #define FLAGS_FINUP 0x0002
77 #define FLAGS_FINAL 0x0004
78 #define FLAGS_FAST 0x0008
79 #define FLAGS_SHA1 0x0010
80 #define FLAGS_DMA_ACTIVE 0x0020
81 #define FLAGS_OUTPUT_READY 0x0040
82 #define FLAGS_CLEAN 0x0080
83 #define FLAGS_INIT 0x0100
84 #define FLAGS_CPU 0x0200
85 #define FLAGS_HMAC 0x0400
95 struct omap_sham_reqctx {
96 struct omap_sham_dev *dd;
107 struct scatterlist *sg;
108 unsigned int offset; /* offset in current sg */
109 unsigned int total; /* total request */
112 struct omap_sham_hmac_ctx {
113 struct crypto_shash *shash;
114 u8 ipad[SHA1_MD5_BLOCK_SIZE];
115 u8 opad[SHA1_MD5_BLOCK_SIZE];
118 struct omap_sham_ctx {
119 struct omap_sham_dev *dd;
124 struct crypto_shash *fallback;
126 struct omap_sham_hmac_ctx base[0];
129 #define OMAP_SHAM_QUEUE_LENGTH 1
131 struct omap_sham_dev {
132 struct list_head list;
133 unsigned long phys_base;
135 void __iomem *io_base;
141 struct tasklet_struct done_task;
142 struct tasklet_struct queue_task;
145 struct crypto_queue queue;
146 struct ahash_request *req;
149 struct omap_sham_drv {
150 struct list_head dev_list;
155 static struct omap_sham_drv sham = {
156 .dev_list = LIST_HEAD_INIT(sham.dev_list),
157 .lock = __SPIN_LOCK_UNLOCKED(sham.lock),
160 static inline u32 omap_sham_read(struct omap_sham_dev *dd, u32 offset)
162 return __raw_readl(dd->io_base + offset);
165 static inline void omap_sham_write(struct omap_sham_dev *dd,
166 u32 offset, u32 value)
168 __raw_writel(value, dd->io_base + offset);
171 static inline void omap_sham_write_mask(struct omap_sham_dev *dd, u32 address,
176 val = omap_sham_read(dd, address);
179 omap_sham_write(dd, address, val);
182 static inline int omap_sham_wait(struct omap_sham_dev *dd, u32 offset, u32 bit)
184 unsigned long timeout = jiffies + DEFAULT_TIMEOUT_INTERVAL;
186 while (!(omap_sham_read(dd, offset) & bit)) {
187 if (time_is_before_jiffies(timeout))
194 static void omap_sham_copy_hash(struct ahash_request *req, int out)
196 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
197 u32 *hash = (u32 *)req->result;
200 if (likely(ctx->flags & FLAGS_SHA1)) {
201 /* SHA1 results are in big endian */
202 for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(u32); i++)
204 hash[i] = be32_to_cpu(omap_sham_read(ctx->dd,
207 omap_sham_write(ctx->dd, SHA_REG_DIGEST(i),
208 cpu_to_be32(hash[i]));
210 /* MD5 results are in little endian */
211 for (i = 0; i < MD5_DIGEST_SIZE / sizeof(u32); i++)
213 hash[i] = le32_to_cpu(omap_sham_read(ctx->dd,
216 omap_sham_write(ctx->dd, SHA_REG_DIGEST(i),
217 cpu_to_le32(hash[i]));
221 static int omap_sham_write_ctrl(struct omap_sham_dev *dd, size_t length,
224 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
225 u32 val = length << 5, mask;
227 if (unlikely(!ctx->digcnt)) {
229 clk_enable(dd->iclk);
231 if (!(dd->flags & FLAGS_INIT)) {
232 omap_sham_write_mask(dd, SHA_REG_MASK,
233 SHA_REG_MASK_SOFTRESET, SHA_REG_MASK_SOFTRESET);
235 if (omap_sham_wait(dd, SHA_REG_SYSSTATUS,
236 SHA_REG_SYSSTATUS_RESETDONE))
239 dd->flags |= FLAGS_INIT;
242 omap_sham_write(dd, SHA_REG_DIGCNT, ctx->digcnt);
245 omap_sham_write_mask(dd, SHA_REG_MASK,
246 SHA_REG_MASK_IT_EN | (dma ? SHA_REG_MASK_DMA_EN : 0),
247 SHA_REG_MASK_IT_EN | SHA_REG_MASK_DMA_EN);
249 * Setting ALGO_CONST only for the first iteration
250 * and CLOSE_HASH only for the last one.
252 if (ctx->flags & FLAGS_SHA1)
253 val |= SHA_REG_CTRL_ALGO;
255 val |= SHA_REG_CTRL_ALGO_CONST;
257 val |= SHA_REG_CTRL_CLOSE_HASH;
259 mask = SHA_REG_CTRL_ALGO_CONST | SHA_REG_CTRL_CLOSE_HASH |
260 SHA_REG_CTRL_ALGO | SHA_REG_CTRL_LENGTH;
262 omap_sham_write_mask(dd, SHA_REG_CTRL, val, mask);
267 static int omap_sham_xmit_cpu(struct omap_sham_dev *dd, const u8 *buf,
268 size_t length, int final)
270 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
271 int err, count, len32;
272 const u32 *buffer = (const u32 *)buf;
274 dev_dbg(dd->dev, "xmit_cpu: digcnt: %d, length: %d, final: %d\n",
275 ctx->digcnt, length, final);
277 err = omap_sham_write_ctrl(dd, length, final, 0);
281 if (omap_sham_wait(dd, SHA_REG_CTRL, SHA_REG_CTRL_INPUT_READY))
284 ctx->digcnt += length;
287 ctx->flags |= FLAGS_FINAL; /* catch last interrupt */
289 len32 = DIV_ROUND_UP(length, sizeof(u32));
291 for (count = 0; count < len32; count++)
292 omap_sham_write(dd, SHA_REG_DIN(count), buffer[count]);
297 static int omap_sham_xmit_dma(struct omap_sham_dev *dd, dma_addr_t dma_addr,
298 size_t length, int final)
300 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
303 dev_dbg(dd->dev, "xmit_dma: digcnt: %d, length: %d, final: %d\n",
304 ctx->digcnt, length, final);
306 /* flush cache entries related to our page */
307 if (dma_addr == ctx->dma_addr)
308 dma_sync_single_for_device(dd->dev, dma_addr, length,
311 len32 = DIV_ROUND_UP(length, sizeof(u32));
313 omap_set_dma_transfer_params(dd->dma_lch, OMAP_DMA_DATA_TYPE_S32, len32,
314 1, OMAP_DMA_SYNC_PACKET, dd->dma,
315 OMAP_DMA_DST_SYNC_PREFETCH);
317 omap_set_dma_src_params(dd->dma_lch, 0, OMAP_DMA_AMODE_POST_INC,
320 err = omap_sham_write_ctrl(dd, length, final, 1);
324 ctx->digcnt += length;
327 ctx->flags |= FLAGS_FINAL; /* catch last interrupt */
329 dd->flags |= FLAGS_DMA_ACTIVE;
331 omap_start_dma(dd->dma_lch);
336 static size_t omap_sham_append_buffer(struct omap_sham_reqctx *ctx,
337 const u8 *data, size_t length)
339 size_t count = min(length, ctx->buflen - ctx->bufcnt);
341 count = min(count, ctx->total);
344 memcpy(ctx->buffer + ctx->bufcnt, data, count);
345 ctx->bufcnt += count;
350 static size_t omap_sham_append_sg(struct omap_sham_reqctx *ctx)
355 count = omap_sham_append_buffer(ctx,
356 sg_virt(ctx->sg) + ctx->offset,
357 ctx->sg->length - ctx->offset);
360 ctx->offset += count;
362 if (ctx->offset == ctx->sg->length) {
363 ctx->sg = sg_next(ctx->sg);
374 static int omap_sham_update_dma_slow(struct omap_sham_dev *dd)
376 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
383 omap_sham_append_sg(ctx);
385 final = (ctx->flags & FLAGS_FINUP) && !ctx->total;
387 dev_dbg(dd->dev, "slow: bufcnt: %u, digcnt: %d, final: %d\n",
388 ctx->bufcnt, ctx->digcnt, final);
390 if (final || (ctx->bufcnt == ctx->buflen && ctx->total)) {
393 return omap_sham_xmit_dma(dd, ctx->dma_addr, count, final);
399 static int omap_sham_update_dma_fast(struct omap_sham_dev *dd)
401 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
404 ctx->flags |= FLAGS_FAST;
406 length = min(ctx->total, sg_dma_len(ctx->sg));
409 if (!dma_map_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE)) {
410 dev_err(dd->dev, "dma_map_sg error\n");
414 ctx->total -= length;
416 return omap_sham_xmit_dma(dd, sg_dma_address(ctx->sg), length, 1);
419 static int omap_sham_update_cpu(struct omap_sham_dev *dd)
421 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
424 omap_sham_append_sg(ctx);
425 bufcnt = ctx->bufcnt;
428 return omap_sham_xmit_cpu(dd, ctx->buffer, bufcnt, 1);
431 static int omap_sham_update_dma_stop(struct omap_sham_dev *dd)
433 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
435 omap_stop_dma(dd->dma_lch);
436 if (ctx->flags & FLAGS_FAST)
437 dma_unmap_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE);
442 static void omap_sham_cleanup(struct ahash_request *req)
444 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
445 struct omap_sham_dev *dd = ctx->dd;
448 spin_lock_irqsave(&dd->lock, flags);
449 if (ctx->flags & FLAGS_CLEAN) {
450 spin_unlock_irqrestore(&dd->lock, flags);
453 ctx->flags |= FLAGS_CLEAN;
454 spin_unlock_irqrestore(&dd->lock, flags);
457 clk_disable(dd->iclk);
460 dma_unmap_single(dd->dev, ctx->dma_addr, ctx->buflen,
464 free_page((unsigned long)ctx->buffer);
466 dev_dbg(dd->dev, "digcnt: %d, bufcnt: %d\n", ctx->digcnt, ctx->bufcnt);
469 static int omap_sham_init(struct ahash_request *req)
471 struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
472 struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
473 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
474 struct omap_sham_dev *dd = NULL, *tmp;
476 spin_lock_bh(&sham.lock);
478 list_for_each_entry(tmp, &sham.dev_list, list) {
486 spin_unlock_bh(&sham.lock);
492 ctx->flags |= FLAGS_FIRST;
494 dev_dbg(dd->dev, "init: digest size: %d\n",
495 crypto_ahash_digestsize(tfm));
497 if (crypto_ahash_digestsize(tfm) == SHA1_DIGEST_SIZE)
498 ctx->flags |= FLAGS_SHA1;
503 ctx->buflen = PAGE_SIZE;
504 ctx->buffer = (void *)__get_free_page(
505 (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
506 GFP_KERNEL : GFP_ATOMIC);
510 ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer, ctx->buflen,
512 if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
513 dev_err(dd->dev, "dma %u bytes error\n", ctx->buflen);
514 free_page((unsigned long)ctx->buffer);
518 if (tctx->flags & FLAGS_HMAC) {
519 struct omap_sham_hmac_ctx *bctx = tctx->base;
521 memcpy(ctx->buffer, bctx->ipad, SHA1_MD5_BLOCK_SIZE);
522 ctx->bufcnt = SHA1_MD5_BLOCK_SIZE;
523 ctx->flags |= FLAGS_HMAC;
530 static int omap_sham_update_req(struct omap_sham_dev *dd)
532 struct ahash_request *req = dd->req;
533 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
536 dev_dbg(dd->dev, "update_req: total: %u, digcnt: %d, finup: %d\n",
537 ctx->total, ctx->digcnt, (ctx->flags & FLAGS_FINUP) != 0);
539 if (ctx->flags & FLAGS_CPU)
540 err = omap_sham_update_cpu(dd);
541 else if (ctx->flags & FLAGS_FAST)
542 err = omap_sham_update_dma_fast(dd);
544 err = omap_sham_update_dma_slow(dd);
546 /* wait for dma completion before can take more data */
547 dev_dbg(dd->dev, "update: err: %d, digcnt: %d\n", err, ctx->digcnt);
552 static int omap_sham_final_req(struct omap_sham_dev *dd)
554 struct ahash_request *req = dd->req;
555 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
556 int err = 0, use_dma = 1;
558 if (ctx->bufcnt <= 64)
559 /* faster to handle last block with cpu */
563 err = omap_sham_xmit_dma(dd, ctx->dma_addr, ctx->bufcnt, 1);
565 err = omap_sham_xmit_cpu(dd, ctx->buffer, ctx->bufcnt, 1);
569 if (err != -EINPROGRESS)
570 omap_sham_cleanup(req);
572 dev_dbg(dd->dev, "final_req: err: %d\n", err);
577 static int omap_sham_finish_req_hmac(struct ahash_request *req)
579 struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
580 struct omap_sham_hmac_ctx *bctx = tctx->base;
581 int bs = crypto_shash_blocksize(bctx->shash);
582 int ds = crypto_shash_digestsize(bctx->shash);
584 struct shash_desc shash;
585 char ctx[crypto_shash_descsize(bctx->shash)];
588 desc.shash.tfm = bctx->shash;
589 desc.shash.flags = 0; /* not CRYPTO_TFM_REQ_MAY_SLEEP */
591 return crypto_shash_init(&desc.shash) ?:
592 crypto_shash_update(&desc.shash, bctx->opad, bs) ?:
593 crypto_shash_finup(&desc.shash, req->result, ds, req->result);
596 static void omap_sham_finish_req(struct ahash_request *req, int err)
598 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
601 omap_sham_copy_hash(ctx->dd->req, 1);
602 if (ctx->flags & FLAGS_HMAC)
603 err = omap_sham_finish_req_hmac(req);
606 if (ctx->flags & FLAGS_FINAL)
607 omap_sham_cleanup(req);
609 clear_bit(FLAGS_BUSY, &ctx->dd->flags);
611 if (req->base.complete)
612 req->base.complete(&req->base, err);
615 static int omap_sham_handle_queue(struct omap_sham_dev *dd)
617 struct crypto_async_request *async_req, *backlog;
618 struct omap_sham_reqctx *ctx;
619 struct ahash_request *req, *prev_req;
623 if (test_and_set_bit(FLAGS_BUSY, &dd->flags))
626 spin_lock_irqsave(&dd->lock, flags);
627 backlog = crypto_get_backlog(&dd->queue);
628 async_req = crypto_dequeue_request(&dd->queue);
630 clear_bit(FLAGS_BUSY, &dd->flags);
631 spin_unlock_irqrestore(&dd->lock, flags);
637 backlog->complete(backlog, -EINPROGRESS);
639 req = ahash_request_cast(async_req);
644 ctx = ahash_request_ctx(req);
646 dev_dbg(dd->dev, "handling new req, op: %lu, nbytes: %d\n",
647 ctx->op, req->nbytes);
649 if (req != prev_req && ctx->digcnt)
650 /* request has changed - restore hash */
651 omap_sham_copy_hash(req, 0);
653 if (ctx->op == OP_UPDATE) {
654 err = omap_sham_update_req(dd);
655 if (err != -EINPROGRESS && (ctx->flags & FLAGS_FINUP))
656 /* no final() after finup() */
657 err = omap_sham_final_req(dd);
658 } else if (ctx->op == OP_FINAL) {
659 err = omap_sham_final_req(dd);
662 if (err != -EINPROGRESS) {
663 /* done_task will not finish it, so do it here */
664 omap_sham_finish_req(req, err);
665 tasklet_schedule(&dd->queue_task);
668 dev_dbg(dd->dev, "exit, err: %d\n", err);
673 static int omap_sham_enqueue(struct ahash_request *req, unsigned int op)
675 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
676 struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
677 struct omap_sham_dev *dd = tctx->dd;
683 spin_lock_irqsave(&dd->lock, flags);
684 err = ahash_enqueue_request(&dd->queue, req);
685 spin_unlock_irqrestore(&dd->lock, flags);
687 omap_sham_handle_queue(dd);
692 static int omap_sham_update(struct ahash_request *req)
694 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
699 ctx->total = req->nbytes;
703 if (ctx->flags & FLAGS_FINUP) {
704 if ((ctx->digcnt + ctx->bufcnt + ctx->total) < 9) {
706 * OMAP HW accel works only with buffers >= 9
707 * will switch to bypass in final()
708 * final has the same request and data
710 omap_sham_append_sg(ctx);
712 } else if (ctx->bufcnt + ctx->total <= 64) {
713 ctx->flags |= FLAGS_CPU;
714 } else if (!ctx->bufcnt && sg_is_last(ctx->sg)) {
715 /* may be can use faster functions */
716 int aligned = IS_ALIGNED((u32)ctx->sg->offset,
719 if (aligned && (ctx->flags & FLAGS_FIRST))
720 /* digest: first and final */
721 ctx->flags |= FLAGS_FAST;
723 ctx->flags &= ~FLAGS_FIRST;
725 } else if (ctx->bufcnt + ctx->total <= ctx->buflen) {
726 /* if not finaup -> not fast */
727 omap_sham_append_sg(ctx);
731 return omap_sham_enqueue(req, OP_UPDATE);
734 static int omap_sham_shash_digest(struct crypto_shash *shash, u32 flags,
735 const u8 *data, unsigned int len, u8 *out)
738 struct shash_desc shash;
739 char ctx[crypto_shash_descsize(shash)];
742 desc.shash.tfm = shash;
743 desc.shash.flags = flags & CRYPTO_TFM_REQ_MAY_SLEEP;
745 return crypto_shash_digest(&desc.shash, data, len, out);
748 static int omap_sham_final_shash(struct ahash_request *req)
750 struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
751 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
753 return omap_sham_shash_digest(tctx->fallback, req->base.flags,
754 ctx->buffer, ctx->bufcnt, req->result);
757 static int omap_sham_final(struct ahash_request *req)
759 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
762 ctx->flags |= FLAGS_FINUP;
764 /* OMAP HW accel works only with buffers >= 9 */
765 /* HMAC is always >= 9 because of ipad */
766 if ((ctx->digcnt + ctx->bufcnt) < 9)
767 err = omap_sham_final_shash(req);
768 else if (ctx->bufcnt)
769 return omap_sham_enqueue(req, OP_FINAL);
771 omap_sham_cleanup(req);
776 static int omap_sham_finup(struct ahash_request *req)
778 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
781 ctx->flags |= FLAGS_FINUP;
783 err1 = omap_sham_update(req);
784 if (err1 == -EINPROGRESS)
787 * final() has to be always called to cleanup resources
788 * even if udpate() failed, except EINPROGRESS
790 err2 = omap_sham_final(req);
795 static int omap_sham_digest(struct ahash_request *req)
797 return omap_sham_init(req) ?: omap_sham_finup(req);
800 static int omap_sham_setkey(struct crypto_ahash *tfm, const u8 *key,
803 struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
804 struct omap_sham_hmac_ctx *bctx = tctx->base;
805 int bs = crypto_shash_blocksize(bctx->shash);
806 int ds = crypto_shash_digestsize(bctx->shash);
808 err = crypto_shash_setkey(tctx->fallback, key, keylen);
813 err = omap_sham_shash_digest(bctx->shash,
814 crypto_shash_get_flags(bctx->shash),
815 key, keylen, bctx->ipad);
820 memcpy(bctx->ipad, key, keylen);
823 memset(bctx->ipad + keylen, 0, bs - keylen);
824 memcpy(bctx->opad, bctx->ipad, bs);
826 for (i = 0; i < bs; i++) {
827 bctx->ipad[i] ^= 0x36;
828 bctx->opad[i] ^= 0x5c;
834 static int omap_sham_cra_init_alg(struct crypto_tfm *tfm, const char *alg_base)
836 struct omap_sham_ctx *tctx = crypto_tfm_ctx(tfm);
837 const char *alg_name = crypto_tfm_alg_name(tfm);
839 /* Allocate a fallback and abort if it failed. */
840 tctx->fallback = crypto_alloc_shash(alg_name, 0,
841 CRYPTO_ALG_NEED_FALLBACK);
842 if (IS_ERR(tctx->fallback)) {
843 pr_err("omap-sham: fallback driver '%s' "
844 "could not be loaded.\n", alg_name);
845 return PTR_ERR(tctx->fallback);
848 crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
849 sizeof(struct omap_sham_reqctx));
852 struct omap_sham_hmac_ctx *bctx = tctx->base;
853 tctx->flags |= FLAGS_HMAC;
854 bctx->shash = crypto_alloc_shash(alg_base, 0,
855 CRYPTO_ALG_NEED_FALLBACK);
856 if (IS_ERR(bctx->shash)) {
857 pr_err("omap-sham: base driver '%s' "
858 "could not be loaded.\n", alg_base);
859 crypto_free_shash(tctx->fallback);
860 return PTR_ERR(bctx->shash);
868 static int omap_sham_cra_init(struct crypto_tfm *tfm)
870 return omap_sham_cra_init_alg(tfm, NULL);
873 static int omap_sham_cra_sha1_init(struct crypto_tfm *tfm)
875 return omap_sham_cra_init_alg(tfm, "sha1");
878 static int omap_sham_cra_md5_init(struct crypto_tfm *tfm)
880 return omap_sham_cra_init_alg(tfm, "md5");
883 static void omap_sham_cra_exit(struct crypto_tfm *tfm)
885 struct omap_sham_ctx *tctx = crypto_tfm_ctx(tfm);
887 crypto_free_shash(tctx->fallback);
888 tctx->fallback = NULL;
890 if (tctx->flags & FLAGS_HMAC) {
891 struct omap_sham_hmac_ctx *bctx = tctx->base;
892 crypto_free_shash(bctx->shash);
896 static struct ahash_alg algs[] = {
898 .init = omap_sham_init,
899 .update = omap_sham_update,
900 .final = omap_sham_final,
901 .finup = omap_sham_finup,
902 .digest = omap_sham_digest,
903 .halg.digestsize = SHA1_DIGEST_SIZE,
906 .cra_driver_name = "omap-sha1",
908 .cra_flags = CRYPTO_ALG_TYPE_AHASH |
910 CRYPTO_ALG_NEED_FALLBACK,
911 .cra_blocksize = SHA1_BLOCK_SIZE,
912 .cra_ctxsize = sizeof(struct omap_sham_ctx),
914 .cra_module = THIS_MODULE,
915 .cra_init = omap_sham_cra_init,
916 .cra_exit = omap_sham_cra_exit,
920 .init = omap_sham_init,
921 .update = omap_sham_update,
922 .final = omap_sham_final,
923 .finup = omap_sham_finup,
924 .digest = omap_sham_digest,
925 .halg.digestsize = MD5_DIGEST_SIZE,
928 .cra_driver_name = "omap-md5",
930 .cra_flags = CRYPTO_ALG_TYPE_AHASH |
932 CRYPTO_ALG_NEED_FALLBACK,
933 .cra_blocksize = SHA1_BLOCK_SIZE,
934 .cra_ctxsize = sizeof(struct omap_sham_ctx),
936 .cra_module = THIS_MODULE,
937 .cra_init = omap_sham_cra_init,
938 .cra_exit = omap_sham_cra_exit,
942 .init = omap_sham_init,
943 .update = omap_sham_update,
944 .final = omap_sham_final,
945 .finup = omap_sham_finup,
946 .digest = omap_sham_digest,
947 .setkey = omap_sham_setkey,
948 .halg.digestsize = SHA1_DIGEST_SIZE,
950 .cra_name = "hmac(sha1)",
951 .cra_driver_name = "omap-hmac-sha1",
953 .cra_flags = CRYPTO_ALG_TYPE_AHASH |
955 CRYPTO_ALG_NEED_FALLBACK,
956 .cra_blocksize = SHA1_BLOCK_SIZE,
957 .cra_ctxsize = sizeof(struct omap_sham_ctx) +
958 sizeof(struct omap_sham_hmac_ctx),
960 .cra_module = THIS_MODULE,
961 .cra_init = omap_sham_cra_sha1_init,
962 .cra_exit = omap_sham_cra_exit,
966 .init = omap_sham_init,
967 .update = omap_sham_update,
968 .final = omap_sham_final,
969 .finup = omap_sham_finup,
970 .digest = omap_sham_digest,
971 .setkey = omap_sham_setkey,
972 .halg.digestsize = MD5_DIGEST_SIZE,
974 .cra_name = "hmac(md5)",
975 .cra_driver_name = "omap-hmac-md5",
977 .cra_flags = CRYPTO_ALG_TYPE_AHASH |
979 CRYPTO_ALG_NEED_FALLBACK,
980 .cra_blocksize = SHA1_BLOCK_SIZE,
981 .cra_ctxsize = sizeof(struct omap_sham_ctx) +
982 sizeof(struct omap_sham_hmac_ctx),
984 .cra_module = THIS_MODULE,
985 .cra_init = omap_sham_cra_md5_init,
986 .cra_exit = omap_sham_cra_exit,
991 static void omap_sham_done_task(unsigned long data)
993 struct omap_sham_dev *dd = (struct omap_sham_dev *)data;
994 struct ahash_request *req = dd->req;
995 struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
998 if (ctx->flags & FLAGS_OUTPUT_READY) {
999 ctx->flags &= ~FLAGS_OUTPUT_READY;
1003 if (dd->flags & FLAGS_DMA_ACTIVE) {
1004 dd->flags &= ~FLAGS_DMA_ACTIVE;
1005 omap_sham_update_dma_stop(dd);
1006 omap_sham_update_dma_slow(dd);
1009 if (ready && !(dd->flags & FLAGS_DMA_ACTIVE)) {
1010 dev_dbg(dd->dev, "update done\n");
1011 /* finish curent request */
1012 omap_sham_finish_req(req, 0);
1013 /* start new request */
1014 omap_sham_handle_queue(dd);
1018 static void omap_sham_queue_task(unsigned long data)
1020 struct omap_sham_dev *dd = (struct omap_sham_dev *)data;
1022 omap_sham_handle_queue(dd);
1025 static irqreturn_t omap_sham_irq(int irq, void *dev_id)
1027 struct omap_sham_dev *dd = dev_id;
1028 struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
1031 dev_err(dd->dev, "unknown interrupt.\n");
1035 if (unlikely(ctx->flags & FLAGS_FINAL))
1036 /* final -> allow device to go to power-saving mode */
1037 omap_sham_write_mask(dd, SHA_REG_CTRL, 0, SHA_REG_CTRL_LENGTH);
1039 omap_sham_write_mask(dd, SHA_REG_CTRL, SHA_REG_CTRL_OUTPUT_READY,
1040 SHA_REG_CTRL_OUTPUT_READY);
1041 omap_sham_read(dd, SHA_REG_CTRL);
1043 ctx->flags |= FLAGS_OUTPUT_READY;
1044 tasklet_schedule(&dd->done_task);
1049 static void omap_sham_dma_callback(int lch, u16 ch_status, void *data)
1051 struct omap_sham_dev *dd = data;
1053 if (likely(lch == dd->dma_lch))
1054 tasklet_schedule(&dd->done_task);
1057 static int omap_sham_dma_init(struct omap_sham_dev *dd)
1063 err = omap_request_dma(dd->dma, dev_name(dd->dev),
1064 omap_sham_dma_callback, dd, &dd->dma_lch);
1066 dev_err(dd->dev, "Unable to request DMA channel\n");
1069 omap_set_dma_dest_params(dd->dma_lch, 0,
1070 OMAP_DMA_AMODE_CONSTANT,
1071 dd->phys_base + SHA_REG_DIN(0), 0, 16);
1073 omap_set_dma_dest_burst_mode(dd->dma_lch,
1074 OMAP_DMA_DATA_BURST_16);
1076 omap_set_dma_src_burst_mode(dd->dma_lch,
1077 OMAP_DMA_DATA_BURST_4);
1082 static void omap_sham_dma_cleanup(struct omap_sham_dev *dd)
1084 if (dd->dma_lch >= 0) {
1085 omap_free_dma(dd->dma_lch);
1090 static int __devinit omap_sham_probe(struct platform_device *pdev)
1092 struct omap_sham_dev *dd;
1093 struct device *dev = &pdev->dev;
1094 struct resource *res;
1097 dd = kzalloc(sizeof(struct omap_sham_dev), GFP_KERNEL);
1099 dev_err(dev, "unable to alloc data struct.\n");
1104 platform_set_drvdata(pdev, dd);
1106 INIT_LIST_HEAD(&dd->list);
1107 spin_lock_init(&dd->lock);
1108 tasklet_init(&dd->done_task, omap_sham_done_task, (unsigned long)dd);
1109 tasklet_init(&dd->queue_task, omap_sham_queue_task, (unsigned long)dd);
1110 crypto_init_queue(&dd->queue, OMAP_SHAM_QUEUE_LENGTH);
1114 /* Get the base address */
1115 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1117 dev_err(dev, "no MEM resource info\n");
1121 dd->phys_base = res->start;
1124 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1126 dev_err(dev, "no DMA resource info\n");
1130 dd->dma = res->start;
1133 dd->irq = platform_get_irq(pdev, 0);
1135 dev_err(dev, "no IRQ resource info\n");
1140 err = request_irq(dd->irq, omap_sham_irq,
1141 IRQF_TRIGGER_LOW, dev_name(dev), dd);
1143 dev_err(dev, "unable to request irq.\n");
1147 err = omap_sham_dma_init(dd);
1151 /* Initializing the clock */
1152 dd->iclk = clk_get(dev, "ick");
1154 dev_err(dev, "clock intialization failed.\n");
1159 dd->io_base = ioremap(dd->phys_base, SZ_4K);
1161 dev_err(dev, "can't ioremap\n");
1166 clk_enable(dd->iclk);
1167 dev_info(dev, "hw accel on OMAP rev %u.%u\n",
1168 (omap_sham_read(dd, SHA_REG_REV) & SHA_REG_REV_MAJOR) >> 4,
1169 omap_sham_read(dd, SHA_REG_REV) & SHA_REG_REV_MINOR);
1170 clk_disable(dd->iclk);
1172 spin_lock(&sham.lock);
1173 list_add_tail(&dd->list, &sham.dev_list);
1174 spin_unlock(&sham.lock);
1176 for (i = 0; i < ARRAY_SIZE(algs); i++) {
1177 err = crypto_register_ahash(&algs[i]);
1185 for (j = 0; j < i; j++)
1186 crypto_unregister_ahash(&algs[j]);
1187 iounmap(dd->io_base);
1191 omap_sham_dma_cleanup(dd);
1194 free_irq(dd->irq, dd);
1199 dev_err(dev, "initialization failed.\n");
1204 static int __devexit omap_sham_remove(struct platform_device *pdev)
1206 static struct omap_sham_dev *dd;
1209 dd = platform_get_drvdata(pdev);
1212 spin_lock(&sham.lock);
1213 list_del(&dd->list);
1214 spin_unlock(&sham.lock);
1215 for (i = 0; i < ARRAY_SIZE(algs); i++)
1216 crypto_unregister_ahash(&algs[i]);
1217 tasklet_kill(&dd->done_task);
1218 tasklet_kill(&dd->queue_task);
1219 iounmap(dd->io_base);
1221 omap_sham_dma_cleanup(dd);
1223 free_irq(dd->irq, dd);
1230 static struct platform_driver omap_sham_driver = {
1231 .probe = omap_sham_probe,
1232 .remove = omap_sham_remove,
1234 .name = "omap-sham",
1235 .owner = THIS_MODULE,
1239 static int __init omap_sham_mod_init(void)
1241 pr_info("loading %s driver\n", "omap-sham");
1243 if (!cpu_class_is_omap2() ||
1244 omap_type() != OMAP2_DEVICE_TYPE_SEC) {
1245 pr_err("Unsupported cpu\n");
1249 return platform_driver_register(&omap_sham_driver);
1252 static void __exit omap_sham_mod_exit(void)
1254 platform_driver_unregister(&omap_sham_driver);
1257 module_init(omap_sham_mod_init);
1258 module_exit(omap_sham_mod_exit);
1260 MODULE_DESCRIPTION("OMAP SHA1/MD5 hw acceleration support.");
1261 MODULE_LICENSE("GPL v2");
1262 MODULE_AUTHOR("Dmitry Kasatkin");