crypto: omap - sha1 & md5 driver
Earlier kernel contained omap sha1 and md5 driver, which was not maintained,
was not ported to new crypto APIs and removed from the source tree.
- implements async crypto API using dma and cpu.
- supports multiple sham instances if available
- hmac
- concurrent requests
Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index b08403d..9073aa0 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -222,4 +222,13 @@
help
This option allows you to have support for AMCC crypto acceleration.
+config CRYPTO_DEV_OMAP_SHAM
+ tristate "Support for OMAP SHA1/MD5 hw accelerator"
+ depends on ARCH_OMAP2 || ARCH_OMAP3
+ select CRYPTO_SHA1
+ select CRYPTO_MD5
+ help
+ OMAP processors have SHA1/MD5 hw accelerator. Select this if you
+ want to use the OMAP module for SHA1/MD5 algorithms.
+
endif # CRYPTO_HW
diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile
index 6ffcb3f..c9494e1 100644
--- a/drivers/crypto/Makefile
+++ b/drivers/crypto/Makefile
@@ -6,3 +6,5 @@
obj-$(CONFIG_CRYPTO_DEV_TALITOS) += talitos.o
obj-$(CONFIG_CRYPTO_DEV_IXP4XX) += ixp4xx_crypto.o
obj-$(CONFIG_CRYPTO_DEV_PPC4XX) += amcc/
+obj-$(CONFIG_CRYPTO_DEV_OMAP_SHAM) += omap-sham.o
+
diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c
new file mode 100644
index 0000000..8b03433
--- /dev/null
+++ b/drivers/crypto/omap-sham.c
@@ -0,0 +1,1259 @@
+/*
+ * Cryptographic API.
+ *
+ * Support for OMAP SHA1/MD5 HW acceleration.
+ *
+ * Copyright (c) 2010 Nokia Corporation
+ * Author: Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * Some ideas are from old omap-sha1-md5.c driver.
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/version.h>
+#include <linux/err.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/scatterlist.h>
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+#include <linux/crypto.h>
+#include <linux/cryptohash.h>
+#include <crypto/scatterwalk.h>
+#include <crypto/algapi.h>
+#include <crypto/sha.h>
+#include <crypto/hash.h>
+#include <crypto/internal/hash.h>
+
+#include <plat/cpu.h>
+#include <plat/dma.h>
+#include <mach/irqs.h>
+
+#define SHA_REG_DIGEST(x) (0x00 + ((x) * 0x04))
+#define SHA_REG_DIN(x) (0x1C + ((x) * 0x04))
+
+#define SHA1_MD5_BLOCK_SIZE SHA1_BLOCK_SIZE
+#define MD5_DIGEST_SIZE 16
+
+#define SHA_REG_DIGCNT 0x14
+
+#define SHA_REG_CTRL 0x18
+#define SHA_REG_CTRL_LENGTH (0xFFFFFFFF << 5)
+#define SHA_REG_CTRL_CLOSE_HASH (1 << 4)
+#define SHA_REG_CTRL_ALGO_CONST (1 << 3)
+#define SHA_REG_CTRL_ALGO (1 << 2)
+#define SHA_REG_CTRL_INPUT_READY (1 << 1)
+#define SHA_REG_CTRL_OUTPUT_READY (1 << 0)
+
+#define SHA_REG_REV 0x5C
+#define SHA_REG_REV_MAJOR 0xF0
+#define SHA_REG_REV_MINOR 0x0F
+
+#define SHA_REG_MASK 0x60
+#define SHA_REG_MASK_DMA_EN (1 << 3)
+#define SHA_REG_MASK_IT_EN (1 << 2)
+#define SHA_REG_MASK_SOFTRESET (1 << 1)
+#define SHA_REG_AUTOIDLE (1 << 0)
+
+#define SHA_REG_SYSSTATUS 0x64
+#define SHA_REG_SYSSTATUS_RESETDONE (1 << 0)
+
+#define DEFAULT_TIMEOUT_INTERVAL HZ
+
+#define FLAGS_FIRST 0x0001
+#define FLAGS_FINUP 0x0002
+#define FLAGS_FINAL 0x0004
+#define FLAGS_FAST 0x0008
+#define FLAGS_SHA1 0x0010
+#define FLAGS_DMA_ACTIVE 0x0020
+#define FLAGS_OUTPUT_READY 0x0040
+#define FLAGS_CLEAN 0x0080
+#define FLAGS_INIT 0x0100
+#define FLAGS_CPU 0x0200
+#define FLAGS_HMAC 0x0400
+
+/* 3rd byte */
+#define FLAGS_BUSY 16
+
+#define OP_UPDATE 1
+#define OP_FINAL 2
+
+struct omap_sham_dev;
+
+struct omap_sham_reqctx {
+ struct omap_sham_dev *dd;
+ unsigned long flags;
+ unsigned long op;
+
+ size_t digcnt;
+ u8 *buffer;
+ size_t bufcnt;
+ size_t buflen;
+ dma_addr_t dma_addr;
+
+ /* walk state */
+ struct scatterlist *sg;
+ unsigned int offset; /* offset in current sg */
+ unsigned int total; /* total request */
+};
+
+struct omap_sham_hmac_ctx {
+ struct crypto_shash *shash;
+ u8 ipad[SHA1_MD5_BLOCK_SIZE];
+ u8 opad[SHA1_MD5_BLOCK_SIZE];
+};
+
+struct omap_sham_ctx {
+ struct omap_sham_dev *dd;
+
+ unsigned long flags;
+
+ /* fallback stuff */
+ struct crypto_shash *fallback;
+
+ struct omap_sham_hmac_ctx base[0];
+};
+
+#define OMAP_SHAM_QUEUE_LENGTH 1
+
+struct omap_sham_dev {
+ struct list_head list;
+ unsigned long phys_base;
+ struct device *dev;
+ void __iomem *io_base;
+ int irq;
+ struct clk *iclk;
+ spinlock_t lock;
+ int dma;
+ int dma_lch;
+ struct tasklet_struct done_task;
+ struct tasklet_struct queue_task;
+
+ unsigned long flags;
+ struct crypto_queue queue;
+ struct ahash_request *req;
+};
+
+struct omap_sham_drv {
+ struct list_head dev_list;
+ spinlock_t lock;
+ unsigned long flags;
+};
+
+static struct omap_sham_drv sham = {
+ .dev_list = LIST_HEAD_INIT(sham.dev_list),
+ .lock = __SPIN_LOCK_UNLOCKED(sham.lock),
+};
+
+static inline u32 omap_sham_read(struct omap_sham_dev *dd, u32 offset)
+{
+ return __raw_readl(dd->io_base + offset);
+}
+
+static inline void omap_sham_write(struct omap_sham_dev *dd,
+ u32 offset, u32 value)
+{
+ __raw_writel(value, dd->io_base + offset);
+}
+
+static inline void omap_sham_write_mask(struct omap_sham_dev *dd, u32 address,
+ u32 value, u32 mask)
+{
+ u32 val;
+
+ val = omap_sham_read(dd, address);
+ val &= ~mask;
+ val |= value;
+ omap_sham_write(dd, address, val);
+}
+
+static inline int omap_sham_wait(struct omap_sham_dev *dd, u32 offset, u32 bit)
+{
+ unsigned long timeout = jiffies + DEFAULT_TIMEOUT_INTERVAL;
+
+ while (!(omap_sham_read(dd, offset) & bit)) {
+ if (time_is_before_jiffies(timeout))
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+static void omap_sham_copy_hash(struct ahash_request *req, int out)
+{
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
+ u32 *hash = (u32 *)req->result;
+ int i;
+
+ if (likely(ctx->flags & FLAGS_SHA1)) {
+ /* SHA1 results are in big endian */
+ for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(u32); i++)
+ if (out)
+ hash[i] = be32_to_cpu(omap_sham_read(ctx->dd,
+ SHA_REG_DIGEST(i)));
+ else
+ omap_sham_write(ctx->dd, SHA_REG_DIGEST(i),
+ cpu_to_be32(hash[i]));
+ } else {
+ /* MD5 results are in little endian */
+ for (i = 0; i < MD5_DIGEST_SIZE / sizeof(u32); i++)
+ if (out)
+ hash[i] = le32_to_cpu(omap_sham_read(ctx->dd,
+ SHA_REG_DIGEST(i)));
+ else
+ omap_sham_write(ctx->dd, SHA_REG_DIGEST(i),
+ cpu_to_le32(hash[i]));
+ }
+}
+
+static int omap_sham_write_ctrl(struct omap_sham_dev *dd, size_t length,
+ int final, int dma)
+{
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
+ u32 val = length << 5, mask;
+
+ if (unlikely(!ctx->digcnt)) {
+
+ clk_enable(dd->iclk);
+
+ if (!(dd->flags & FLAGS_INIT)) {
+ omap_sham_write_mask(dd, SHA_REG_MASK,
+ SHA_REG_MASK_SOFTRESET, SHA_REG_MASK_SOFTRESET);
+
+ if (omap_sham_wait(dd, SHA_REG_SYSSTATUS,
+ SHA_REG_SYSSTATUS_RESETDONE))
+ return -ETIMEDOUT;
+
+ dd->flags |= FLAGS_INIT;
+ }
+ } else {
+ omap_sham_write(dd, SHA_REG_DIGCNT, ctx->digcnt);
+ }
+
+ omap_sham_write_mask(dd, SHA_REG_MASK,
+ SHA_REG_MASK_IT_EN | (dma ? SHA_REG_MASK_DMA_EN : 0),
+ SHA_REG_MASK_IT_EN | SHA_REG_MASK_DMA_EN);
+ /*
+ * Setting ALGO_CONST only for the first iteration
+ * and CLOSE_HASH only for the last one.
+ */
+ if (ctx->flags & FLAGS_SHA1)
+ val |= SHA_REG_CTRL_ALGO;
+ if (!ctx->digcnt)
+ val |= SHA_REG_CTRL_ALGO_CONST;
+ if (final)
+ val |= SHA_REG_CTRL_CLOSE_HASH;
+
+ mask = SHA_REG_CTRL_ALGO_CONST | SHA_REG_CTRL_CLOSE_HASH |
+ SHA_REG_CTRL_ALGO | SHA_REG_CTRL_LENGTH;
+
+ omap_sham_write_mask(dd, SHA_REG_CTRL, val, mask);
+
+ return 0;
+}
+
+static int omap_sham_xmit_cpu(struct omap_sham_dev *dd, const u8 *buf,
+ size_t length, int final)
+{
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
+ int err, count, len32;
+ const u32 *buffer = (const u32 *)buf;
+
+ dev_dbg(dd->dev, "xmit_cpu: digcnt: %d, length: %d, final: %d\n",
+ ctx->digcnt, length, final);
+
+ err = omap_sham_write_ctrl(dd, length, final, 0);
+ if (err)
+ return err;
+
+ if (omap_sham_wait(dd, SHA_REG_CTRL, SHA_REG_CTRL_INPUT_READY))
+ return -ETIMEDOUT;
+
+ ctx->digcnt += length;
+
+ if (final)
+ ctx->flags |= FLAGS_FINAL; /* catch last interrupt */
+
+ len32 = DIV_ROUND_UP(length, sizeof(u32));
+
+ for (count = 0; count < len32; count++)
+ omap_sham_write(dd, SHA_REG_DIN(count), buffer[count]);
+
+ return -EINPROGRESS;
+}
+
+static int omap_sham_xmit_dma(struct omap_sham_dev *dd, dma_addr_t dma_addr,
+ size_t length, int final)
+{
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
+ int err, len32;
+
+ dev_dbg(dd->dev, "xmit_dma: digcnt: %d, length: %d, final: %d\n",
+ ctx->digcnt, length, final);
+
+ /* flush cache entries related to our page */
+ if (dma_addr == ctx->dma_addr)
+ dma_sync_single_for_device(dd->dev, dma_addr, length,
+ DMA_TO_DEVICE);
+
+ len32 = DIV_ROUND_UP(length, sizeof(u32));
+
+ omap_set_dma_transfer_params(dd->dma_lch, OMAP_DMA_DATA_TYPE_S32, len32,
+ 1, OMAP_DMA_SYNC_PACKET, dd->dma, OMAP_DMA_DST_SYNC);
+
+ omap_set_dma_src_params(dd->dma_lch, 0, OMAP_DMA_AMODE_POST_INC,
+ dma_addr, 0, 0);
+
+ err = omap_sham_write_ctrl(dd, length, final, 1);
+ if (err)
+ return err;
+
+ ctx->digcnt += length;
+
+ if (final)
+ ctx->flags |= FLAGS_FINAL; /* catch last interrupt */
+
+ dd->flags |= FLAGS_DMA_ACTIVE;
+
+ omap_start_dma(dd->dma_lch);
+
+ return -EINPROGRESS;
+}
+
+static size_t omap_sham_append_buffer(struct omap_sham_reqctx *ctx,
+ const u8 *data, size_t length)
+{
+ size_t count = min(length, ctx->buflen - ctx->bufcnt);
+
+ count = min(count, ctx->total);
+ if (count <= 0)
+ return 0;
+ memcpy(ctx->buffer + ctx->bufcnt, data, count);
+ ctx->bufcnt += count;
+
+ return count;
+}
+
+static size_t omap_sham_append_sg(struct omap_sham_reqctx *ctx)
+{
+ size_t count;
+
+ while (ctx->sg) {
+ count = omap_sham_append_buffer(ctx,
+ sg_virt(ctx->sg) + ctx->offset,
+ ctx->sg->length - ctx->offset);
+ if (!count)
+ break;
+ ctx->offset += count;
+ ctx->total -= count;
+ if (ctx->offset == ctx->sg->length) {
+ ctx->sg = sg_next(ctx->sg);
+ if (ctx->sg)
+ ctx->offset = 0;
+ else
+ ctx->total = 0;
+ }
+ }
+
+ return 0;
+}
+
+static int omap_sham_update_dma_slow(struct omap_sham_dev *dd)
+{
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
+ unsigned int final;
+ size_t count;
+
+ if (!ctx->total)
+ return 0;
+
+ omap_sham_append_sg(ctx);
+
+ final = (ctx->flags & FLAGS_FINUP) && !ctx->total;
+
+ dev_dbg(dd->dev, "slow: bufcnt: %u, digcnt: %d, final: %d\n",
+ ctx->bufcnt, ctx->digcnt, final);
+
+ if (final || (ctx->bufcnt == ctx->buflen && ctx->total)) {
+ count = ctx->bufcnt;
+ ctx->bufcnt = 0;
+ return omap_sham_xmit_dma(dd, ctx->dma_addr, count, final);
+ }
+
+ return 0;
+}
+
+static int omap_sham_update_dma_fast(struct omap_sham_dev *dd)
+{
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
+ unsigned int length;
+
+ ctx->flags |= FLAGS_FAST;
+
+ length = min(ctx->total, sg_dma_len(ctx->sg));
+ ctx->total = length;
+
+ if (!dma_map_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE)) {
+ dev_err(dd->dev, "dma_map_sg error\n");
+ return -EINVAL;
+ }
+
+ ctx->total -= length;
+
+ return omap_sham_xmit_dma(dd, sg_dma_address(ctx->sg), length, 1);
+}
+
+static int omap_sham_update_cpu(struct omap_sham_dev *dd)
+{
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
+ int bufcnt;
+
+ omap_sham_append_sg(ctx);
+ bufcnt = ctx->bufcnt;
+ ctx->bufcnt = 0;
+
+ return omap_sham_xmit_cpu(dd, ctx->buffer, bufcnt, 1);
+}
+
+static int omap_sham_update_dma_stop(struct omap_sham_dev *dd)
+{
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
+
+ omap_stop_dma(dd->dma_lch);
+ if (ctx->flags & FLAGS_FAST)
+ dma_unmap_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE);
+
+ return 0;
+}
+
+static void omap_sham_cleanup(struct ahash_request *req)
+{
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
+ struct omap_sham_dev *dd = ctx->dd;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dd->lock, flags);
+ if (ctx->flags & FLAGS_CLEAN) {
+ spin_unlock_irqrestore(&dd->lock, flags);
+ return;
+ }
+ ctx->flags |= FLAGS_CLEAN;
+ spin_unlock_irqrestore(&dd->lock, flags);
+
+ if (ctx->digcnt)
+ clk_disable(dd->iclk);
+
+ if (ctx->dma_addr)
+ dma_unmap_single(dd->dev, ctx->dma_addr, ctx->buflen,
+ DMA_TO_DEVICE);
+
+ if (ctx->buffer)
+ free_page((unsigned long)ctx->buffer);
+
+ dev_dbg(dd->dev, "digcnt: %d, bufcnt: %d\n", ctx->digcnt, ctx->bufcnt);
+}
+
+static int omap_sham_init(struct ahash_request *req)
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
+ struct omap_sham_dev *dd = NULL, *tmp;
+
+ spin_lock_bh(&sham.lock);
+ if (!tctx->dd) {
+ list_for_each_entry(tmp, &sham.dev_list, list) {
+ dd = tmp;
+ break;
+ }
+ tctx->dd = dd;
+ } else {
+ dd = tctx->dd;
+ }
+ spin_unlock_bh(&sham.lock);
+
+ ctx->dd = dd;
+
+ ctx->flags = 0;
+
+ ctx->flags |= FLAGS_FIRST;
+
+ dev_dbg(dd->dev, "init: digest size: %d\n",
+ crypto_ahash_digestsize(tfm));
+
+ if (crypto_ahash_digestsize(tfm) == SHA1_DIGEST_SIZE)
+ ctx->flags |= FLAGS_SHA1;
+
+ ctx->bufcnt = 0;
+ ctx->digcnt = 0;
+
+ ctx->buflen = PAGE_SIZE;
+ ctx->buffer = (void *)__get_free_page(
+ (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
+ GFP_KERNEL : GFP_ATOMIC);
+ if (!ctx->buffer)
+ return -ENOMEM;
+
+ ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer, ctx->buflen,
+ DMA_TO_DEVICE);
+ if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
+ dev_err(dd->dev, "dma %u bytes error\n", ctx->buflen);
+ free_page((unsigned long)ctx->buffer);
+ return -EINVAL;
+ }
+
+ if (tctx->flags & FLAGS_HMAC) {
+ struct omap_sham_hmac_ctx *bctx = tctx->base;
+
+ memcpy(ctx->buffer, bctx->ipad, SHA1_MD5_BLOCK_SIZE);
+ ctx->bufcnt = SHA1_MD5_BLOCK_SIZE;
+ ctx->flags |= FLAGS_HMAC;
+ }
+
+ return 0;
+
+}
+
+static int omap_sham_update_req(struct omap_sham_dev *dd)
+{
+ struct ahash_request *req = dd->req;
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
+ int err;
+
+ dev_dbg(dd->dev, "update_req: total: %u, digcnt: %d, finup: %d\n",
+ ctx->total, ctx->digcnt, (ctx->flags & FLAGS_FINUP) != 0);
+
+ if (ctx->flags & FLAGS_CPU)
+ err = omap_sham_update_cpu(dd);
+ else if (ctx->flags & FLAGS_FAST)
+ err = omap_sham_update_dma_fast(dd);
+ else
+ err = omap_sham_update_dma_slow(dd);
+
+ /* wait for dma completion before can take more data */
+ dev_dbg(dd->dev, "update: err: %d, digcnt: %d\n", err, ctx->digcnt);
+
+ return err;
+}
+
+static int omap_sham_final_req(struct omap_sham_dev *dd)
+{
+ struct ahash_request *req = dd->req;
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
+ int err = 0, use_dma = 1;
+
+ if (ctx->bufcnt <= 64)
+ /* faster to handle last block with cpu */
+ use_dma = 0;
+
+ if (use_dma)
+ err = omap_sham_xmit_dma(dd, ctx->dma_addr, ctx->bufcnt, 1);
+ else
+ err = omap_sham_xmit_cpu(dd, ctx->buffer, ctx->bufcnt, 1);
+
+ ctx->bufcnt = 0;
+
+ if (err != -EINPROGRESS)
+ omap_sham_cleanup(req);
+
+ dev_dbg(dd->dev, "final_req: err: %d\n", err);
+
+ return err;
+}
+
+static int omap_sham_finish_req_hmac(struct ahash_request *req)
+{
+ struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
+ struct omap_sham_hmac_ctx *bctx = tctx->base;
+ int bs = crypto_shash_blocksize(bctx->shash);
+ int ds = crypto_shash_digestsize(bctx->shash);
+ struct {
+ struct shash_desc shash;
+ char ctx[crypto_shash_descsize(bctx->shash)];
+ } desc;
+
+ desc.shash.tfm = bctx->shash;
+ desc.shash.flags = 0; /* not CRYPTO_TFM_REQ_MAY_SLEEP */
+
+ return crypto_shash_init(&desc.shash) ?:
+ crypto_shash_update(&desc.shash, bctx->opad, bs) ?:
+ crypto_shash_finup(&desc.shash, req->result, ds, req->result);
+}
+
+static void omap_sham_finish_req(struct ahash_request *req, int err)
+{
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
+
+ if (!err) {
+ omap_sham_copy_hash(ctx->dd->req, 1);
+ if (ctx->flags & FLAGS_HMAC)
+ err = omap_sham_finish_req_hmac(req);
+ }
+
+ if (ctx->flags & FLAGS_FINAL)
+ omap_sham_cleanup(req);
+
+ clear_bit(FLAGS_BUSY, &ctx->dd->flags);
+
+ if (req->base.complete)
+ req->base.complete(&req->base, err);
+}
+
+static int omap_sham_handle_queue(struct omap_sham_dev *dd)
+{
+ struct crypto_async_request *async_req, *backlog;
+ struct omap_sham_reqctx *ctx;
+ struct ahash_request *req, *prev_req;
+ unsigned long flags;
+ int err = 0;
+
+ if (test_and_set_bit(FLAGS_BUSY, &dd->flags))
+ return 0;
+
+ spin_lock_irqsave(&dd->lock, flags);
+ backlog = crypto_get_backlog(&dd->queue);
+ async_req = crypto_dequeue_request(&dd->queue);
+ if (!async_req)
+ clear_bit(FLAGS_BUSY, &dd->flags);
+ spin_unlock_irqrestore(&dd->lock, flags);
+
+ if (!async_req)
+ return 0;
+
+ if (backlog)
+ backlog->complete(backlog, -EINPROGRESS);
+
+ req = ahash_request_cast(async_req);
+
+ prev_req = dd->req;
+ dd->req = req;
+
+ ctx = ahash_request_ctx(req);
+
+ dev_dbg(dd->dev, "handling new req, op: %lu, nbytes: %d\n",
+ ctx->op, req->nbytes);
+
+ if (req != prev_req && ctx->digcnt)
+ /* request has changed - restore hash */
+ omap_sham_copy_hash(req, 0);
+
+ if (ctx->op == OP_UPDATE) {
+ err = omap_sham_update_req(dd);
+ if (err != -EINPROGRESS && (ctx->flags & FLAGS_FINUP))
+ /* no final() after finup() */
+ err = omap_sham_final_req(dd);
+ } else if (ctx->op == OP_FINAL) {
+ err = omap_sham_final_req(dd);
+ }
+
+ if (err != -EINPROGRESS) {
+ /* done_task will not finish it, so do it here */
+ omap_sham_finish_req(req, err);
+ tasklet_schedule(&dd->queue_task);
+ }
+
+ dev_dbg(dd->dev, "exit, err: %d\n", err);
+
+ return err;
+}
+
+static int omap_sham_enqueue(struct ahash_request *req, unsigned int op)
+{
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
+ struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
+ struct omap_sham_dev *dd = tctx->dd;
+ unsigned long flags;
+ int err;
+
+ ctx->op = op;
+
+ spin_lock_irqsave(&dd->lock, flags);
+ err = ahash_enqueue_request(&dd->queue, req);
+ spin_unlock_irqrestore(&dd->lock, flags);
+
+ omap_sham_handle_queue(dd);
+
+ return err;
+}
+
+static int omap_sham_update(struct ahash_request *req)
+{
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
+
+ if (!req->nbytes)
+ return 0;
+
+ ctx->total = req->nbytes;
+ ctx->sg = req->src;
+ ctx->offset = 0;
+
+ if (ctx->flags & FLAGS_FINUP) {
+ if ((ctx->digcnt + ctx->bufcnt + ctx->total) < 9) {
+ /*
+ * OMAP HW accel works only with buffers >= 9
+ * will switch to bypass in final()
+ * final has the same request and data
+ */
+ omap_sham_append_sg(ctx);
+ return 0;
+ } else if (ctx->bufcnt + ctx->total <= 64) {
+ ctx->flags |= FLAGS_CPU;
+ } else if (!ctx->bufcnt && sg_is_last(ctx->sg)) {
+ /* may be can use faster functions */
+ int aligned = IS_ALIGNED((u32)ctx->sg->offset,
+ sizeof(u32));
+
+ if (aligned && (ctx->flags & FLAGS_FIRST))
+ /* digest: first and final */
+ ctx->flags |= FLAGS_FAST;
+
+ ctx->flags &= ~FLAGS_FIRST;
+ }
+ } else if (ctx->bufcnt + ctx->total <= ctx->buflen) {
+ /* if not finaup -> not fast */
+ omap_sham_append_sg(ctx);
+ return 0;
+ }
+
+ return omap_sham_enqueue(req, OP_UPDATE);
+}
+
+static int omap_sham_shash_digest(struct crypto_shash *shash, u32 flags,
+ const u8 *data, unsigned int len, u8 *out)
+{
+ struct {
+ struct shash_desc shash;
+ char ctx[crypto_shash_descsize(shash)];
+ } desc;
+
+ desc.shash.tfm = shash;
+ desc.shash.flags = flags & CRYPTO_TFM_REQ_MAY_SLEEP;
+
+ return crypto_shash_digest(&desc.shash, data, len, out);
+}
+
+static int omap_sham_final_shash(struct ahash_request *req)
+{
+ struct omap_sham_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
+
+ return omap_sham_shash_digest(tctx->fallback, req->base.flags,
+ ctx->buffer, ctx->bufcnt, req->result);
+}
+
+static int omap_sham_final(struct ahash_request *req)
+{
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
+ int err = 0;
+
+ ctx->flags |= FLAGS_FINUP;
+
+ /* OMAP HW accel works only with buffers >= 9 */
+ /* HMAC is always >= 9 because of ipad */
+ if ((ctx->digcnt + ctx->bufcnt) < 9)
+ err = omap_sham_final_shash(req);
+ else if (ctx->bufcnt)
+ return omap_sham_enqueue(req, OP_FINAL);
+
+ omap_sham_cleanup(req);
+
+ return err;
+}
+
+static int omap_sham_finup(struct ahash_request *req)
+{
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
+ int err1, err2;
+
+ ctx->flags |= FLAGS_FINUP;
+
+ err1 = omap_sham_update(req);
+ if (err1 == -EINPROGRESS)
+ return err1;
+ /*
+ * final() has to be always called to cleanup resources
+ * even if udpate() failed, except EINPROGRESS
+ */
+ err2 = omap_sham_final(req);
+
+ return err1 ?: err2;
+}
+
+static int omap_sham_digest(struct ahash_request *req)
+{
+ return omap_sham_init(req) ?: omap_sham_finup(req);
+}
+
+static int omap_sham_setkey(struct crypto_ahash *tfm, const u8 *key,
+ unsigned int keylen)
+{
+ struct omap_sham_ctx *tctx = crypto_ahash_ctx(tfm);
+ struct omap_sham_hmac_ctx *bctx = tctx->base;
+ int bs = crypto_shash_blocksize(bctx->shash);
+ int ds = crypto_shash_digestsize(bctx->shash);
+ int err, i;
+ err = crypto_shash_setkey(tctx->fallback, key, keylen);
+ if (err)
+ return err;
+
+ if (keylen > bs) {
+ err = omap_sham_shash_digest(bctx->shash,
+ crypto_shash_get_flags(bctx->shash),
+ key, keylen, bctx->ipad);
+ if (err)
+ return err;
+ keylen = ds;
+ } else {
+ memcpy(bctx->ipad, key, keylen);
+ }
+
+ memset(bctx->ipad + keylen, 0, bs - keylen);
+ memcpy(bctx->opad, bctx->ipad, bs);
+
+ for (i = 0; i < bs; i++) {
+ bctx->ipad[i] ^= 0x36;
+ bctx->opad[i] ^= 0x5c;
+ }
+
+ return err;
+}
+
+static int omap_sham_cra_init_alg(struct crypto_tfm *tfm, const char *alg_base)
+{
+ struct omap_sham_ctx *tctx = crypto_tfm_ctx(tfm);
+ const char *alg_name = crypto_tfm_alg_name(tfm);
+
+ /* Allocate a fallback and abort if it failed. */
+ tctx->fallback = crypto_alloc_shash(alg_name, 0,
+ CRYPTO_ALG_NEED_FALLBACK);
+ if (IS_ERR(tctx->fallback)) {
+ pr_err("omap-sham: fallback driver '%s' "
+ "could not be loaded.\n", alg_name);
+ return PTR_ERR(tctx->fallback);
+ }
+
+ crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
+ sizeof(struct omap_sham_reqctx));
+
+ if (alg_base) {
+ struct omap_sham_hmac_ctx *bctx = tctx->base;
+ tctx->flags |= FLAGS_HMAC;
+ bctx->shash = crypto_alloc_shash(alg_base, 0,
+ CRYPTO_ALG_NEED_FALLBACK);
+ if (IS_ERR(bctx->shash)) {
+ pr_err("omap-sham: base driver '%s' "
+ "could not be loaded.\n", alg_base);
+ crypto_free_shash(tctx->fallback);
+ return PTR_ERR(bctx->shash);
+ }
+
+ }
+
+ return 0;
+}
+
+static int omap_sham_cra_init(struct crypto_tfm *tfm)
+{
+ return omap_sham_cra_init_alg(tfm, NULL);
+}
+
+static int omap_sham_cra_sha1_init(struct crypto_tfm *tfm)
+{
+ return omap_sham_cra_init_alg(tfm, "sha1");
+}
+
+static int omap_sham_cra_md5_init(struct crypto_tfm *tfm)
+{
+ return omap_sham_cra_init_alg(tfm, "md5");
+}
+
+static void omap_sham_cra_exit(struct crypto_tfm *tfm)
+{
+ struct omap_sham_ctx *tctx = crypto_tfm_ctx(tfm);
+
+ crypto_free_shash(tctx->fallback);
+ tctx->fallback = NULL;
+
+ if (tctx->flags & FLAGS_HMAC) {
+ struct omap_sham_hmac_ctx *bctx = tctx->base;
+ crypto_free_shash(bctx->shash);
+ }
+}
+
+static struct ahash_alg algs[] = {
+{
+ .init = omap_sham_init,
+ .update = omap_sham_update,
+ .final = omap_sham_final,
+ .finup = omap_sham_finup,
+ .digest = omap_sham_digest,
+ .halg.digestsize = SHA1_DIGEST_SIZE,
+ .halg.base = {
+ .cra_name = "sha1",
+ .cra_driver_name = "omap-sha1",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_AHASH |
+ CRYPTO_ALG_ASYNC |
+ CRYPTO_ALG_NEED_FALLBACK,
+ .cra_blocksize = SHA1_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct omap_sham_ctx),
+ .cra_alignmask = 0,
+ .cra_module = THIS_MODULE,
+ .cra_init = omap_sham_cra_init,
+ .cra_exit = omap_sham_cra_exit,
+ }
+},
+{
+ .init = omap_sham_init,
+ .update = omap_sham_update,
+ .final = omap_sham_final,
+ .finup = omap_sham_finup,
+ .digest = omap_sham_digest,
+ .halg.digestsize = MD5_DIGEST_SIZE,
+ .halg.base = {
+ .cra_name = "md5",
+ .cra_driver_name = "omap-md5",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_AHASH |
+ CRYPTO_ALG_ASYNC |
+ CRYPTO_ALG_NEED_FALLBACK,
+ .cra_blocksize = SHA1_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct omap_sham_ctx),
+ .cra_alignmask = 0,
+ .cra_module = THIS_MODULE,
+ .cra_init = omap_sham_cra_init,
+ .cra_exit = omap_sham_cra_exit,
+ }
+},
+{
+ .init = omap_sham_init,
+ .update = omap_sham_update,
+ .final = omap_sham_final,
+ .finup = omap_sham_finup,
+ .digest = omap_sham_digest,
+ .setkey = omap_sham_setkey,
+ .halg.digestsize = SHA1_DIGEST_SIZE,
+ .halg.base = {
+ .cra_name = "hmac(sha1)",
+ .cra_driver_name = "omap-hmac-sha1",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_AHASH |
+ CRYPTO_ALG_ASYNC |
+ CRYPTO_ALG_NEED_FALLBACK,
+ .cra_blocksize = SHA1_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct omap_sham_ctx) +
+ sizeof(struct omap_sham_hmac_ctx),
+ .cra_alignmask = 0,
+ .cra_module = THIS_MODULE,
+ .cra_init = omap_sham_cra_sha1_init,
+ .cra_exit = omap_sham_cra_exit,
+ }
+},
+{
+ .init = omap_sham_init,
+ .update = omap_sham_update,
+ .final = omap_sham_final,
+ .finup = omap_sham_finup,
+ .digest = omap_sham_digest,
+ .setkey = omap_sham_setkey,
+ .halg.digestsize = MD5_DIGEST_SIZE,
+ .halg.base = {
+ .cra_name = "hmac(md5)",
+ .cra_driver_name = "omap-hmac-md5",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_TYPE_AHASH |
+ CRYPTO_ALG_ASYNC |
+ CRYPTO_ALG_NEED_FALLBACK,
+ .cra_blocksize = SHA1_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct omap_sham_ctx) +
+ sizeof(struct omap_sham_hmac_ctx),
+ .cra_alignmask = 0,
+ .cra_module = THIS_MODULE,
+ .cra_init = omap_sham_cra_md5_init,
+ .cra_exit = omap_sham_cra_exit,
+ }
+}
+};
+
+static void omap_sham_done_task(unsigned long data)
+{
+ struct omap_sham_dev *dd = (struct omap_sham_dev *)data;
+ struct ahash_request *req = dd->req;
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(req);
+ int ready = 1;
+
+ if (ctx->flags & FLAGS_OUTPUT_READY) {
+ ctx->flags &= ~FLAGS_OUTPUT_READY;
+ ready = 1;
+ }
+
+ if (dd->flags & FLAGS_DMA_ACTIVE) {
+ dd->flags &= ~FLAGS_DMA_ACTIVE;
+ omap_sham_update_dma_stop(dd);
+ omap_sham_update_dma_slow(dd);
+ }
+
+ if (ready && !(dd->flags & FLAGS_DMA_ACTIVE)) {
+ dev_dbg(dd->dev, "update done\n");
+ /* finish curent request */
+ omap_sham_finish_req(req, 0);
+ /* start new request */
+ omap_sham_handle_queue(dd);
+ }
+}
+
+static void omap_sham_queue_task(unsigned long data)
+{
+ struct omap_sham_dev *dd = (struct omap_sham_dev *)data;
+
+ omap_sham_handle_queue(dd);
+}
+
+static irqreturn_t omap_sham_irq(int irq, void *dev_id)
+{
+ struct omap_sham_dev *dd = dev_id;
+ struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req);
+
+ if (!ctx) {
+ dev_err(dd->dev, "unknown interrupt.\n");
+ return IRQ_HANDLED;
+ }
+
+ if (unlikely(ctx->flags & FLAGS_FINAL))
+ /* final -> allow device to go to power-saving mode */
+ omap_sham_write_mask(dd, SHA_REG_CTRL, 0, SHA_REG_CTRL_LENGTH);
+
+ omap_sham_write_mask(dd, SHA_REG_CTRL, SHA_REG_CTRL_OUTPUT_READY,
+ SHA_REG_CTRL_OUTPUT_READY);
+ omap_sham_read(dd, SHA_REG_CTRL);
+
+ ctx->flags |= FLAGS_OUTPUT_READY;
+ tasklet_schedule(&dd->done_task);
+
+ return IRQ_HANDLED;
+}
+
+static void omap_sham_dma_callback(int lch, u16 ch_status, void *data)
+{
+ struct omap_sham_dev *dd = data;
+
+ if (likely(lch == dd->dma_lch))
+ tasklet_schedule(&dd->done_task);
+}
+
+static int omap_sham_dma_init(struct omap_sham_dev *dd)
+{
+ int err;
+
+ dd->dma_lch = -1;
+
+ err = omap_request_dma(dd->dma, dev_name(dd->dev),
+ omap_sham_dma_callback, dd, &dd->dma_lch);
+ if (err) {
+ dev_err(dd->dev, "Unable to request DMA channel\n");
+ return err;
+ }
+ omap_set_dma_dest_params(dd->dma_lch, 0,
+ OMAP_DMA_AMODE_CONSTANT,
+ dd->phys_base + SHA_REG_DIN(0), 0, 16);
+
+ omap_set_dma_dest_burst_mode(dd->dma_lch,
+ OMAP_DMA_DATA_BURST_16);
+
+ return 0;
+}
+
+static void omap_sham_dma_cleanup(struct omap_sham_dev *dd)
+{
+ if (dd->dma_lch >= 0) {
+ omap_free_dma(dd->dma_lch);
+ dd->dma_lch = -1;
+ }
+}
+
+static int __devinit omap_sham_probe(struct platform_device *pdev)
+{
+ struct omap_sham_dev *dd;
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ int err, i, j;
+
+ dd = kzalloc(sizeof(struct omap_sham_dev), GFP_KERNEL);
+ if (dd == NULL) {
+ dev_err(dev, "unable to alloc data struct.\n");
+ err = -ENOMEM;
+ goto data_err;
+ }
+ dd->dev = dev;
+ platform_set_drvdata(pdev, dd);
+
+ INIT_LIST_HEAD(&dd->list);
+ spin_lock_init(&dd->lock);
+ tasklet_init(&dd->done_task, omap_sham_done_task, (unsigned long)dd);
+ tasklet_init(&dd->queue_task, omap_sham_queue_task, (unsigned long)dd);
+ crypto_init_queue(&dd->queue, OMAP_SHAM_QUEUE_LENGTH);
+
+ dd->irq = -1;
+
+ /* Get the base address */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev, "no MEM resource info\n");
+ err = -ENODEV;
+ goto res_err;
+ }
+ dd->phys_base = res->start;
+
+ /* Get the DMA */
+ res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+ if (!res) {
+ dev_err(dev, "no DMA resource info\n");
+ err = -ENODEV;
+ goto res_err;
+ }
+ dd->dma = res->start;
+
+ /* Get the IRQ */
+ dd->irq = platform_get_irq(pdev, 0);
+ if (dd->irq < 0) {
+ dev_err(dev, "no IRQ resource info\n");
+ err = dd->irq;
+ goto res_err;
+ }
+
+ err = request_irq(dd->irq, omap_sham_irq,
+ IRQF_TRIGGER_LOW, dev_name(dev), dd);
+ if (err) {
+ dev_err(dev, "unable to request irq.\n");
+ goto res_err;
+ }
+
+ err = omap_sham_dma_init(dd);
+ if (err)
+ goto dma_err;
+
+ /* Initializing the clock */
+ dd->iclk = clk_get(dev, "ick");
+ if (!dd->iclk) {
+ dev_err(dev, "clock intialization failed.\n");
+ err = -ENODEV;
+ goto clk_err;
+ }
+
+ dd->io_base = ioremap(dd->phys_base, SZ_4K);
+ if (!dd->io_base) {
+ dev_err(dev, "can't ioremap\n");
+ err = -ENOMEM;
+ goto io_err;
+ }
+
+ clk_enable(dd->iclk);
+ dev_info(dev, "hw accel on OMAP rev %u.%u\n",
+ (omap_sham_read(dd, SHA_REG_REV) & SHA_REG_REV_MAJOR) >> 4,
+ omap_sham_read(dd, SHA_REG_REV) & SHA_REG_REV_MINOR);
+ clk_disable(dd->iclk);
+
+ spin_lock(&sham.lock);
+ list_add_tail(&dd->list, &sham.dev_list);
+ spin_unlock(&sham.lock);
+
+ for (i = 0; i < ARRAY_SIZE(algs); i++) {
+ err = crypto_register_ahash(&algs[i]);
+ if (err)
+ goto err_algs;
+ }
+
+ return 0;
+
+err_algs:
+ for (j = 0; j < i; j++)
+ crypto_unregister_ahash(&algs[j]);
+ iounmap(dd->io_base);
+io_err:
+ clk_put(dd->iclk);
+clk_err:
+ omap_sham_dma_cleanup(dd);
+dma_err:
+ if (dd->irq >= 0)
+ free_irq(dd->irq, dd);
+res_err:
+ kfree(dd);
+ dd = NULL;
+data_err:
+ dev_err(dev, "initialization failed.\n");
+
+ return err;
+}
+
+static int __devexit omap_sham_remove(struct platform_device *pdev)
+{
+ static struct omap_sham_dev *dd;
+ int i;
+
+ dd = platform_get_drvdata(pdev);
+ if (!dd)
+ return -ENODEV;
+ spin_lock(&sham.lock);
+ list_del(&dd->list);
+ spin_unlock(&sham.lock);
+ for (i = 0; i < ARRAY_SIZE(algs); i++)
+ crypto_unregister_ahash(&algs[i]);
+ tasklet_kill(&dd->done_task);
+ tasklet_kill(&dd->queue_task);
+ iounmap(dd->io_base);
+ clk_put(dd->iclk);
+ omap_sham_dma_cleanup(dd);
+ if (dd->irq >= 0)
+ free_irq(dd->irq, dd);
+ kfree(dd);
+ dd = NULL;
+
+ return 0;
+}
+
+static struct platform_driver omap_sham_driver = {
+ .probe = omap_sham_probe,
+ .remove = omap_sham_remove,
+ .driver = {
+ .name = "omap-sham",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init omap_sham_mod_init(void)
+{
+ pr_info("loading %s driver\n", "omap-sham");
+
+ if (!cpu_class_is_omap2() ||
+ omap_type() != OMAP2_DEVICE_TYPE_SEC) {
+ pr_err("Unsupported cpu\n");
+ return -ENODEV;
+ }
+
+ return platform_driver_register(&omap_sham_driver);
+}
+
+static void __exit omap_sham_mod_exit(void)
+{
+ platform_driver_unregister(&omap_sham_driver);
+}
+
+module_init(omap_sham_mod_init);
+module_exit(omap_sham_mod_exit);
+
+MODULE_DESCRIPTION("OMAP SHA1/MD5 hw acceleration support.");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Dmitry Kasatkin");