[PATCH 4/5] crypto: add Atmel SHA1/SHA256 driver

Eric Bénard
2012-07-01T17:21:10Z

drivers/crypto/Kconfig | 14 +
drivers/crypto/Makefile | 1 +
drivers/crypto/atmel-sha-regs.h | 46 ++
drivers/crypto/atmel-sha.c | 1112 +++++++++++++++++++++++++++++++++++++++
4 files changed, 1173 insertions(+), 0 deletions(-)
create mode 100644 drivers/crypto/atmel-sha-regs.h
create mode 100644 drivers/crypto/atmel-sha.c

diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index 9ac7128..631014b 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -358,4 +358,18 @@ config CRYPTO_DEV_ATMEL_TDES
To compile this driver as a module, choose M here: the module
will be called atmel-tdes.

+config CRYPTO_DEV_ATMEL_SHA
+ tristate "Support for Atmel SHA1/SHA256 hw accelerator"
+ depends on ARCH_AT91
+ select CRYPTO_SHA1
+ select CRYPTO_SHA256
+ select CRYPTO_ALGAPI
+ help
+ Some Atmel processors have SHA1/SHA256 hw accelerator.
+ Select this if you want to use the Atmel module for
+ SHA1/SHA256 algorithms.
+
+ To compile this driver as a module, choose M here: the module
+ will be called atmel-sha.
+
endif # CRYPTO_HW
diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile
index 211fdc2..387bee1 100644
--- a/drivers/crypto/Makefile
+++ b/drivers/crypto/Makefile
@@ -17,3 +17,4 @@ obj-$(CONFIG_CRYPTO_DEV_TEGRA_AES) += tegra-aes.o
obj-$(CONFIG_CRYPTO_DEV_UX500) += ux500/
obj-$(CONFIG_CRYPTO_DEV_ATMEL_AES) += atmel-aes.o
obj-$(CONFIG_CRYPTO_DEV_ATMEL_TDES) += atmel-tdes.o
+obj-$(CONFIG_CRYPTO_DEV_ATMEL_SHA) += atmel-sha.o
diff --git a/drivers/crypto/atmel-sha-regs.h b/drivers/crypto/atmel-sha-regs.h
new file mode 100644
index 0000000..dc53a20
--- /dev/null
+++ b/drivers/crypto/atmel-sha-regs.h
@@ -0,0 +1,46 @@
+#ifndef __ATMEL_SHA_REGS_H__
+#define __ATMEL_SHA_REGS_H__
+
+#define SHA_REG_DIGEST(x) (0x80 + ((x) * 0x04))
+#define SHA_REG_DIN(x) (0x40 + ((x) * 0x04))
+
+#define SHA_CR 0x00
+#define SHA_CR_START (1 << 0)
+#define SHA_CR_FIRST (1 << 4)
+#define SHA_CR_SWRST (1 << 8)
+
+#define SHA_MR 0x04
+#define SHA_MR_MODE_MASK (0x3 << 0)
+#define SHA_MR_MODE_MANUAL 0x0
+#define SHA_MR_MODE_AUTO 0x1
+#define SHA_MR_MODE_PDC 0x2
+#define SHA_MR_DUALBUFF (1 << 3)
+#define SHA_MR_PROCDLY (1 << 4)
+#define SHA_MR_ALGO_SHA1 (0 << 8)
+#define SHA_MR_ALGO_SHA256 (1 << 8)
+
+#define SHA_IER 0x10
+#define SHA_IDR 0x14
+#define SHA_IMR 0x18
+#define SHA_ISR 0x1C
+#define SHA_INT_DATARDY (1 << 0)
+#define SHA_INT_ENDTX (1 << 1)
+#define SHA_INT_TXBUFE (1 << 2)
+#define SHA_INT_URAD (1 << 8)
+#define SHA_ISR_URAT_MASK (0x7 << 12)
+#define SHA_ISR_URAT_IDR (0x0 << 12)
+#define SHA_ISR_URAT_ODR (0x1 << 12)
+#define SHA_ISR_URAT_MR (0x2 << 12)
+#define SHA_ISR_URAT_WO (0x5 << 12)
+
+#define SHA_TPR 0x108
+#define SHA_TCR 0x10C
+#define SHA_TNPR 0x118
+#define SHA_TNCR 0x11C
+#define SHA_PTCR 0x120
+#define SHA_PTCR_TXTEN (1 << 8)
+#define SHA_PTCR_TXTDIS (1 << 9)
+#define SHA_PTSR 0x124
+#define SHA_PTSR_TXTEN (1 << 8)
+
+#endif /* __ATMEL_SHA_REGS_H__ */
diff --git a/drivers/crypto/atmel-sha.c b/drivers/crypto/atmel-sha.c
new file mode 100644
index 0000000..f938b9d
--- /dev/null
+++ b/drivers/crypto/atmel-sha.c
@@ -0,0 +1,1112 @@
+/*
+ * Cryptographic API.
+ *
+ * Support for ATMEL SHA1/SHA256 HW acceleration.
+ *
+ * Copyright (c) 2012 Eukréa Electromatique - ATMEL
+ * Author: Nicolas Royer <nicolas@eukrea.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 omap-sham.c drivers.
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/hw_random.h>
+#include <linux/platform_device.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 "atmel-sha-regs.h"
+
+/* SHA flags */
+#define SHA_FLAGS_BUSY BIT(0)
+#define SHA_FLAGS_FINAL BIT(1)
+#define SHA_FLAGS_DMA_ACTIVE BIT(2)
+#define SHA_FLAGS_OUTPUT_READY BIT(3)
+#define SHA_FLAGS_INIT BIT(4)
+#define SHA_FLAGS_CPU BIT(5)
+#define SHA_FLAGS_DMA_READY BIT(6)
+
+#define SHA_FLAGS_FINUP BIT(16)
+#define SHA_FLAGS_SG BIT(17)
+#define SHA_FLAGS_SHA1 BIT(18)
+#define SHA_FLAGS_SHA256 BIT(19)
+#define SHA_FLAGS_ERROR BIT(20)
+#define SHA_FLAGS_PAD BIT(21)
+
+#define SHA_FLAGS_DUALBUFF BIT(24)
+
+#define SHA_OP_UPDATE 1
+#define SHA_OP_FINAL 2
+
+#define SHA_BUFFER_LEN PAGE_SIZE
+
+#define ATMEL_SHA_DMA_THRESHOLD 56
+
+
+struct atmel_sha_dev;
+
+struct atmel_sha_reqctx {
+ struct atmel_sha_dev *dd;
+ unsigned long flags;
+ unsigned long op;
+
+ u8 digest[SHA256_DIGEST_SIZE] __aligned(sizeof(u32));
+ size_t digcnt;
+ 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 */
+
+ u8 buffer[0] __aligned(sizeof(u32));
+};
+
+struct atmel_sha_ctx {
+ struct atmel_sha_dev *dd;
+
+ unsigned long flags;
+
+ /* fallback stuff */
+ struct crypto_shash *fallback;
+
+};
+
+#define ATMEL_SHA_QUEUE_LENGTH 1
+
+struct atmel_sha_dev {
+ struct list_head list;
+ unsigned long phys_base;
+ struct device *dev;
+ struct clk *iclk;
+ int irq;
+ void __iomem *io_base;
+
+ spinlock_t lock;
+ int err;
+ struct tasklet_struct done_task;
+
+ unsigned long flags;
+ struct crypto_queue queue;
+ struct ahash_request *req;
+};
+
+struct atmel_sha_drv {
+ struct list_head dev_list;
+ spinlock_t lock;
+};
+
+static struct atmel_sha_drv atmel_sha = {
+ .dev_list = LIST_HEAD_INIT(atmel_sha.dev_list),
+ .lock = __SPIN_LOCK_UNLOCKED(atmel_sha.lock),
+};
+
+static inline u32 atmel_sha_read(struct atmel_sha_dev *dd, u32 offset)
+{
+ return readl_relaxed(dd->io_base + offset);
+}
+
+static inline void atmel_sha_write(struct atmel_sha_dev *dd,
+ u32 offset, u32 value)
+{
+ writel_relaxed(value, dd->io_base + offset);
+}
+
+static void atmel_sha_dualbuff_test(struct atmel_sha_dev *dd)
+{
+ atmel_sha_write(dd, SHA_MR, SHA_MR_DUALBUFF);
+
+ if (atmel_sha_read(dd, SHA_MR) & SHA_MR_DUALBUFF)
+ dd->flags |= SHA_FLAGS_DUALBUFF;
+}
+
+static size_t atmel_sha_append_sg(struct atmel_sha_reqctx *ctx)
+{
+ size_t count;
+
+ while ((ctx->bufcnt < ctx->buflen) && ctx->total) {
+ count = min(ctx->sg->length - ctx->offset, ctx->total);
+ count = min(count, ctx->buflen - ctx->bufcnt);
+
+ if (count <= 0)
+ break;
+
+ scatterwalk_map_and_copy(ctx->buffer + ctx->bufcnt, ctx->sg,
+ ctx->offset, count, 0);
+
+ ctx->bufcnt += count;
+ 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;
+}
+
+/*
+ * The purpose of this padding is to ensure that the padded message
+ * is a multiple of 512 bits. The bit "1" is appended at the end of
+ * the message followed by "padlen-1" zero bits. Then a 64 bits block
+ * equals to the message length in bits is appended.
+ *
+ * padlen is calculated as followed:
+ * - if message length < 56 bytes then padlen = 56 - message length
+ * - else padlen = 64 + 56 - message length
+ */
+static void atmel_sha_fill_padding(struct atmel_sha_reqctx *ctx, int length)
+{
+ unsigned int index, padlen;
+ u64 bits;
+ u64 size;
+
+ bits = (ctx->bufcnt + ctx->digcnt + length) << 3;
+ size = cpu_to_be64(bits);
+
+ index = ctx->bufcnt & 0x3f;
+ padlen = (index < 56) ? (56 - index) : ((64+56) - index);
+ *(ctx->buffer + ctx->bufcnt) = 0x80;
+ memset(ctx->buffer + ctx->bufcnt + 1, 0, padlen-1);
+ memcpy(ctx->buffer + ctx->bufcnt + padlen, &size, 8);
+ ctx->bufcnt += padlen + 8;
+ ctx->flags |= SHA_FLAGS_PAD;
+}
+
+static int atmel_sha_init(struct ahash_request *req)
+{
+ struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+ struct atmel_sha_ctx *tctx = crypto_ahash_ctx(tfm);
+ struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+ struct atmel_sha_dev *dd = NULL;
+ struct atmel_sha_dev *tmp;
+
+ spin_lock_bh(&atmel_sha.lock);
+ if (!tctx->dd) {
+ list_for_each_entry(tmp, &atmel_sha.dev_list, list) {
+ dd = tmp;
+ break;
+ }
+ tctx->dd = dd;
+ } else {
+ dd = tctx->dd;
+ }
+
+ spin_unlock_bh(&atmel_sha.lock);
+
+ ctx->dd = dd;
+
+ ctx->flags = 0;
+
+ dev_dbg(dd->dev, "init: digest size: %d\n",
+ crypto_ahash_digestsize(tfm));
+
+ if (crypto_ahash_digestsize(tfm) == SHA1_DIGEST_SIZE)
+ ctx->flags |= SHA_FLAGS_SHA1;
+ else if (crypto_ahash_digestsize(tfm) == SHA256_DIGEST_SIZE)
+ ctx->flags |= SHA_FLAGS_SHA256;
+
+ ctx->bufcnt = 0;
+ ctx->digcnt = 0;
+ ctx->buflen = SHA_BUFFER_LEN;
+
+ return 0;
+}
+
+static void atmel_sha_write_ctrl(struct atmel_sha_dev *dd, int dma)
+{
+ struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
+ u32 valcr = 0, valmr = SHA_MR_MODE_AUTO;
+
+ if (likely(dma)) {
+ atmel_sha_write(dd, SHA_IER, SHA_INT_TXBUFE);
+ valmr = SHA_MR_MODE_PDC;
+ if (dd->flags & SHA_FLAGS_DUALBUFF)
+ valmr = SHA_MR_DUALBUFF;
+ } else {
+ atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY);
+ }
+
+ if (ctx->flags & SHA_FLAGS_SHA256)
+ valmr |= SHA_MR_ALGO_SHA256;
+
+ /* Setting CR_FIRST only for the first iteration */
+ if (!ctx->digcnt)
+ valcr = SHA_CR_FIRST;
+
+ atmel_sha_write(dd, SHA_CR, valcr);
+ atmel_sha_write(dd, SHA_MR, valmr);
+}
+
+static int atmel_sha_xmit_cpu(struct atmel_sha_dev *dd, const u8 *buf,
+ size_t length, int final)
+{
+ struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
+ int 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);
+
+ atmel_sha_write_ctrl(dd, 0);
+
+ /* should be non-zero before next lines to disable clocks later */
+ ctx->digcnt += length;
+
+ if (final)
+ dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */
+
+ len32 = DIV_ROUND_UP(length, sizeof(u32));
+
+ dd->flags |= SHA_FLAGS_CPU;
+
+ for (count = 0; count < len32; count++)
+ atmel_sha_write(dd, SHA_REG_DIN(count), buffer[count]);
+
+ return -EINPROGRESS;
+}
+
+static int atmel_sha_xmit_pdc(struct atmel_sha_dev *dd, dma_addr_t dma_addr1,
+ size_t length1, dma_addr_t dma_addr2, size_t length2, int final)
+{
+ struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
+ int len32;
+
+ dev_dbg(dd->dev, "xmit_pdc: digcnt: %d, length: %d, final: %d\n",
+ ctx->digcnt, length1, final);
+
+ len32 = DIV_ROUND_UP(length1, sizeof(u32));
+ atmel_sha_write(dd, SHA_PTCR, SHA_PTCR_TXTDIS);
+ atmel_sha_write(dd, SHA_TPR, dma_addr1);
+ atmel_sha_write(dd, SHA_TCR, len32);
+
+ len32 = DIV_ROUND_UP(length2, sizeof(u32));
+ atmel_sha_write(dd, SHA_TNPR, dma_addr2);
+ atmel_sha_write(dd, SHA_TNCR, len32);
+
+ atmel_sha_write_ctrl(dd, 1);
+
+ /* should be non-zero before next lines to disable clocks later */
+ ctx->digcnt += length1;
+
+ if (final)
+ dd->flags |= SHA_FLAGS_FINAL; /* catch last interrupt */
+
+ dd->flags |= SHA_FLAGS_DMA_ACTIVE;
+
+ /* Start DMA transfer */
+ atmel_sha_write(dd, SHA_PTCR, SHA_PTCR_TXTEN);
+
+ return -EINPROGRESS;
+}
+
+static int atmel_sha_update_cpu(struct atmel_sha_dev *dd)
+{
+ struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
+ int bufcnt;
+
+ atmel_sha_append_sg(ctx);
+ atmel_sha_fill_padding(ctx, 0);
+
+ bufcnt = ctx->bufcnt;
+ ctx->bufcnt = 0;
+
+ return atmel_sha_xmit_cpu(dd, ctx->buffer, bufcnt, 1);
+}
+
+static int atmel_sha_xmit_dma_map(struct atmel_sha_dev *dd,
+ struct atmel_sha_reqctx *ctx,
+ size_t length, int final)
+{
+ ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer,
+ ctx->buflen + SHA1_BLOCK_SIZE, DMA_TO_DEVICE);
+ if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
+ dev_err(dd->dev, "dma %u bytes error\n", ctx->buflen +
+ SHA1_BLOCK_SIZE);
+ return -EINVAL;
+ }
+
+ ctx->flags &= ~SHA_FLAGS_SG;
+
+ /* next call does not fail... so no unmap in the case of error */
+ return atmel_sha_xmit_pdc(dd, ctx->dma_addr, length, 0, 0, final);
+}
+
+static int atmel_sha_update_dma_slow(struct atmel_sha_dev *dd)
+{
+ struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
+ unsigned int final;
+ size_t count;
+
+ atmel_sha_append_sg(ctx);
+
+ final = (ctx->flags & SHA_FLAGS_FINUP) && !ctx->total;
+
+ dev_dbg(dd->dev, "slow: bufcnt: %u, digcnt: %d, final: %d\n",
+ ctx->bufcnt, ctx->digcnt, final);
+
+ if (final)
+ atmel_sha_fill_padding(ctx, 0);
+
+ if (final || (ctx->bufcnt == ctx->buflen && ctx->total)) {
+ count = ctx->bufcnt;
+ ctx->bufcnt = 0;
+ return atmel_sha_xmit_dma_map(dd, ctx, count, final);
+ }
+
+ return 0;
+}
+
+static int atmel_sha_update_dma_start(struct atmel_sha_dev *dd)
+{
+ struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
+ unsigned int length, final, tail;
+ struct scatterlist *sg;
+ unsigned int count;
+
+ if (!ctx->total)
+ return 0;
+
+ if (ctx->bufcnt || ctx->offset)
+ return atmel_sha_update_dma_slow(dd);
+
+ dev_dbg(dd->dev, "fast: digcnt: %d, bufcnt: %u, total: %u\n",
+ ctx->digcnt, ctx->bufcnt, ctx->total);
+
+ sg = ctx->sg;
+
+ if (!IS_ALIGNED(sg->offset, sizeof(u32)))
+ return atmel_sha_update_dma_slow(dd);
+
+ if (!sg_is_last(sg) && !IS_ALIGNED(sg->length, SHA1_BLOCK_SIZE))
+ /* size is not SHA1_BLOCK_SIZE aligned */
+ return atmel_sha_update_dma_slow(dd);
+
+ length = min(ctx->total, sg->length);
+
+ if (sg_is_last(sg)) {
+ if (!(ctx->flags & SHA_FLAGS_FINUP)) {
+ /* not last sg must be SHA1_BLOCK_SIZE aligned */
+ tail = length & (SHA1_BLOCK_SIZE - 1);
+ length -= tail;
+ if (length == 0) {
+ /* offset where to start slow */
+ ctx->offset = length;
+ return atmel_sha_update_dma_slow(dd);
+ }
+ }
+ }
+
+ ctx->total -= length;
+ ctx->offset = length; /* offset where to start slow */
+
+ final = (ctx->flags & SHA_FLAGS_FINUP) && !ctx->total;
+
+ /* Add padding */
+ if (final) {
+ tail = length & (SHA1_BLOCK_SIZE - 1);
+ length -= tail;
+ ctx->total += tail;
+ ctx->offset = length; /* offset where to start slow */
+
+ sg = ctx->sg;
+ atmel_sha_append_sg(ctx);
+
+ atmel_sha_fill_padding(ctx, length);
+
+ ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer,
+ ctx->buflen + SHA1_BLOCK_SIZE, DMA_TO_DEVICE);
+ if (dma_mapping_error(dd->dev, ctx->dma_addr)) {
+ dev_err(dd->dev, "dma %u bytes error\n",
+ ctx->buflen + SHA1_BLOCK_SIZE);
+ return -EINVAL;
+ }
+
+ if (length == 0) {
+ ctx->flags &= ~SHA_FLAGS_SG;
+ count = ctx->bufcnt;
+ ctx->bufcnt = 0;
+ return atmel_sha_xmit_pdc(dd, ctx->dma_addr, count, 0,
+ 0, final);
+ } else {
+ ctx->sg = sg;
+ if (!dma_map_sg(dd->dev, ctx->sg, 1,
+ DMA_TO_DEVICE)) {
+ dev_err(dd->dev, "dma_map_sg error\n");
+ return -EINVAL;
+ }
+
+ ctx->flags |= SHA_FLAGS_SG;
+
+ count = ctx->bufcnt;
+ ctx->bufcnt = 0;
+ return atmel_sha_xmit_pdc(dd, sg_dma_address(ctx->sg),
+ length, ctx->dma_addr, count, final);
+ }
+ }
+
+ if (!dma_map_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE)) {
+ dev_err(dd->dev, "dma_map_sg error\n");
+ return -EINVAL;
+ }
+
+ ctx->flags |= SHA_FLAGS_SG;
+
+ /* next call does not fail... so no unmap in the case of error */
+ return atmel_sha_xmit_pdc(dd, sg_dma_address(ctx->sg), length, 0,
+ 0, final);
+}
+
+static int atmel_sha_update_dma_stop(struct atmel_sha_dev *dd)
+{
+ struct atmel_sha_reqctx *ctx = ahash_request_ctx(dd->req);
+
+ if (ctx->flags & SHA_FLAGS_SG) {
+ dma_unmap_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE);
+ if (ctx->sg->length == ctx->offset) {
+ ctx->sg = sg_next(ctx->sg);
+ if (ctx->sg)
+ ctx->offset = 0;
+ }
+ if (ctx->flags & SHA_FLAGS_PAD)
+ dma_unmap_single(dd->dev, ctx->dma_addr,
+ ctx->buflen + SHA1_BLOCK_SIZE, DMA_TO_DEVICE);
+ } else {
+ dma_unmap_single(dd->dev, ctx->dma_addr, ctx->buflen +
+ SHA1_BLOCK_SIZE, DMA_TO_DEVICE);
+ }
+
+ return 0;
+}
+
+static int atmel_sha_update_req(struct atmel_sha_dev *dd)
+{
+ struct ahash_request *req = dd->req;
+ struct atmel_sha_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 & SHA_FLAGS_FINUP) != 0);
+
+ if (ctx->flags & SHA_FLAGS_CPU)
+ err = atmel_sha_update_cpu(dd);
+ else
+ err = atmel_sha_update_dma_start(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 atmel_sha_final_req(struct atmel_sha_dev *dd)
+{
+ struct ahash_request *req = dd->req;
+ struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+ int err = 0;
+ int count;
+
+ if (ctx->bufcnt >= ATMEL_SHA_DMA_THRESHOLD) {
+ atmel_sha_fill_padding(ctx, 0);
+ count = ctx->bufcnt;
+ ctx->bufcnt = 0;
+ err = atmel_sha_xmit_dma_map(dd, ctx, count, 1);
+ }
+ /* faster to handle last block with cpu */
+ else {
+ atmel_sha_fill_padding(ctx, 0);
+ count = ctx->bufcnt;
+ ctx->bufcnt = 0;
+ err = atmel_sha_xmit_cpu(dd, ctx->buffer, count, 1);
+ }
+
+ dev_dbg(dd->dev, "final_req: err: %d\n", err);
+
+ return err;
+}
+
+static void atmel_sha_copy_hash(struct ahash_request *req)
+{
+ struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+ u32 *hash = (u32 *)ctx->digest;
+ int i;
+
+ if (likely(ctx->flags & SHA_FLAGS_SHA1))
+ for (i = 0; i < SHA1_DIGEST_SIZE / sizeof(u32); i++)
+ hash[i] = atmel_sha_read(ctx->dd, SHA_REG_DIGEST(i));
+ else
+ for (i = 0; i < SHA256_DIGEST_SIZE / sizeof(u32); i++)
+ hash[i] = atmel_sha_read(ctx->dd, SHA_REG_DIGEST(i));
+}
+
+static void atmel_sha_copy_ready_hash(struct ahash_request *req)
+{
+ struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+
+ if (!req->result)
+ return;
+
+ if (likely(ctx->flags & SHA_FLAGS_SHA1))
+ memcpy(req->result, ctx->digest, SHA1_DIGEST_SIZE);
+ else
+ memcpy(req->result, ctx->digest, SHA256_DIGEST_SIZE);
+}
+
+static int atmel_sha_finish(struct ahash_request *req)
+{
+ struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+ struct atmel_sha_dev *dd = ctx->dd;
+ int err = 0;
+
+ if (ctx->digcnt)
+ atmel_sha_copy_ready_hash(req);
+
+ dev_dbg(dd->dev, "digcnt: %d, bufcnt: %d\n", ctx->digcnt,
+ ctx->bufcnt);
+
+ return err;
+}
+
+static void atmel_sha_finish_req(struct ahash_request *req, int err)
+{
+ struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+ struct atmel_sha_dev *dd = ctx->dd;
+
+ if (!err) {
+ atmel_sha_copy_hash(req);
+ if (SHA_FLAGS_FINAL & dd->flags)
+ err = atmel_sha_finish(req);
+ } else {
+ ctx->flags |= SHA_FLAGS_ERROR;
+ }
+
+ /* atomic operation is not needed here */
+ dd->flags &= ~(SHA_FLAGS_BUSY | SHA_FLAGS_FINAL | SHA_FLAGS_CPU |
+ SHA_FLAGS_DMA_READY | SHA_FLAGS_OUTPUT_READY);
+
+ clk_disable_unprepare(dd->iclk);
+
+ if (req->base.complete)
+ req->base.complete(&req->base, err);
+
+ /* handle new request */
+ tasklet_schedule(&dd->done_task);
+}
+
+static int atmel_sha_hw_init(struct atmel_sha_dev *dd)
+{
+ clk_prepare_enable(dd->iclk);
+
+ if (SHA_FLAGS_INIT & dd->flags) {
+ atmel_sha_write(dd, SHA_CR, SHA_CR_SWRST);
+ atmel_sha_dualbuff_test(dd);
+ dd->flags |= SHA_FLAGS_INIT;
+ dd->err = 0;
+ }
+
+ return 0;
+}
+
+static int atmel_sha_handle_queue(struct atmel_sha_dev *dd,
+ struct ahash_request *req)
+{
+ struct crypto_async_request *async_req, *backlog;
+ struct atmel_sha_reqctx *ctx;
+ unsigned long flags;
+ int err = 0, ret = 0;
+
+ spin_lock_irqsave(&dd->lock, flags);
+ if (req)
+ ret = ahash_enqueue_request(&dd->queue, req);
+
+ if (SHA_FLAGS_BUSY & dd->flags) {
+ spin_unlock_irqrestore(&dd->lock, flags);
+ return ret;
+ }
+
+ backlog = crypto_get_backlog(&dd->queue);
+ async_req = crypto_dequeue_request(&dd->queue);
+ if (async_req)
+ dd->flags |= SHA_FLAGS_BUSY;
+
+ spin_unlock_irqrestore(&dd->lock, flags);
+
+ if (!async_req)
+ return ret;
+
+ if (backlog)
+ backlog->complete(backlog, -EINPROGRESS);
+
+ req = ahash_request_cast(async_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);
+
+ err = atmel_sha_hw_init(dd);
+
+ if (err)
+ goto err1;
+
+ if (ctx->op == SHA_OP_UPDATE) {
+ err = atmel_sha_update_req(dd);
+ if (err != -EINPROGRESS && (ctx->flags & SHA_FLAGS_FINUP)) {
+ /* no final() after finup() */
+ err = atmel_sha_final_req(dd);
+ }
+ } else if (ctx->op == SHA_OP_FINAL) {
+ err = atmel_sha_final_req(dd);
+ }
+
+err1:
+ if (err != -EINPROGRESS)
+ /* done_task will not finish it, so do it here */
+ atmel_sha_finish_req(req, err);
+
+ dev_dbg(dd->dev, "exit, err: %d\n", err);
+
+ return ret;
+}
+
+static int atmel_sha_enqueue(struct ahash_request *req, unsigned int op)
+{
+ struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+ struct atmel_sha_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
+ struct atmel_sha_dev *dd = tctx->dd;
+
+ ctx->op = op;
+
+ return atmel_sha_handle_queue(dd, req);
+}
+
+static int atmel_sha_update(struct ahash_request *req)
+{
+ struct atmel_sha_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 & SHA_FLAGS_FINUP) {
+ if (ctx->bufcnt + ctx->total < ATMEL_SHA_DMA_THRESHOLD)
+ /* faster to use CPU for short transfers */
+ ctx->flags |= SHA_FLAGS_CPU;
+ } else if (ctx->bufcnt + ctx->total < ctx->buflen) {
+ atmel_sha_append_sg(ctx);
+ return 0;
+ }
+ return atmel_sha_enqueue(req, SHA_OP_UPDATE);
+}
+
+static int atmel_sha_final(struct ahash_request *req)
+{
+ struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+ struct atmel_sha_ctx *tctx = crypto_tfm_ctx(req->base.tfm);
+ struct atmel_sha_dev *dd = tctx->dd;
+
+ int err = 0;
+
+ ctx->flags |= SHA_FLAGS_FINUP;
+
+ if (ctx->flags & SHA_FLAGS_ERROR)
+ return 0; /* uncompleted hash is not needed */
+
+ if (ctx->bufcnt) {
+ return atmel_sha_enqueue(req, SHA_OP_FINAL);
+ } else if (!(ctx->flags & SHA_FLAGS_PAD)) { /* add padding */
+ err = atmel_sha_hw_init(dd);
+ if (err)
+ goto err1;
+
+ dd->flags |= SHA_FLAGS_BUSY;
+ err = atmel_sha_final_req(dd);
+ } else {
+ /* copy ready hash (+ finalize hmac) */
+ return atmel_sha_finish(req);
+ }
+
+err1:
+ if (err != -EINPROGRESS)
+ /* done_task will not finish it, so do it here */
+ atmel_sha_finish_req(req, err);
+
+ return err;
+}
+
+static int atmel_sha_finup(struct ahash_request *req)
+{
+ struct atmel_sha_reqctx *ctx = ahash_request_ctx(req);
+ int err1, err2;
+
+ ctx->flags |= SHA_FLAGS_FINUP;
+
+ err1 = atmel_sha_update(req);
+ if (err1 == -EINPROGRESS || err1 == -EBUSY)
+ return err1;
+
+ /*
+ * final() has to be always called to cleanup resources
+ * even if udpate() failed, except EINPROGRESS
+ */
+ err2 = atmel_sha_final(req);
+
+ return err1 ?: err2;
+}
+
+static int atmel_sha_digest(struct ahash_request *req)
+{
+ return atmel_sha_init(req) ?: atmel_sha_finup(req);
+}
+
+static int atmel_sha_cra_init_alg(struct crypto_tfm *tfm, const char *alg_base)
+{
+ struct atmel_sha_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("atmel-sha: 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 atmel_sha_reqctx) +
+ SHA_BUFFER_LEN + SHA256_BLOCK_SIZE);
+
+ return 0;
+}
+
+static int atmel_sha_cra_init(struct crypto_tfm *tfm)
+{
+ return atmel_sha_cra_init_alg(tfm, NULL);
+}
+
+static void atmel_sha_cra_exit(struct crypto_tfm *tfm)
+{
+ struct atmel_sha_ctx *tctx = crypto_tfm_ctx(tfm);
+
+ crypto_free_shash(tctx->fallback);
+ tctx->fallback = NULL;
+}
+
+static struct ahash_alg sha_algs[] = {
+{
+ .init = atmel_sha_init,
+ .update = atmel_sha_update,
+ .final = atmel_sha_final,
+ .finup = atmel_sha_finup,
+ .digest = atmel_sha_digest,
+ .halg = {
+ .digestsize = SHA1_DIGEST_SIZE,
+ .base = {
+ .cra_name = "sha1",
+ .cra_driver_name = "atmel-sha1",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_ASYNC |
+ CRYPTO_ALG_NEED_FALLBACK,
+ .cra_blocksize = SHA1_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct atmel_sha_ctx),
+ .cra_alignmask = 0,
+ .cra_module = THIS_MODULE,
+ .cra_init = atmel_sha_cra_init,
+ .cra_exit = atmel_sha_cra_exit,
+ }
+ }
+},
+{
+ .init = atmel_sha_init,
+ .update = atmel_sha_update,
+ .final = atmel_sha_final,
+ .finup = atmel_sha_finup,
+ .digest = atmel_sha_digest,
+ .halg = {
+ .digestsize = SHA256_DIGEST_SIZE,
+ .base = {
+ .cra_name = "sha256",
+ .cra_driver_name = "atmel-sha256",
+ .cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_ASYNC |
+ CRYPTO_ALG_NEED_FALLBACK,
+ .cra_blocksize = SHA256_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct atmel_sha_ctx),
+ .cra_alignmask = 0,
+ .cra_module = THIS_MODULE,
+ .cra_init = atmel_sha_cra_init,
+ .cra_exit = atmel_sha_cra_exit,
+ }
+ }
+},
+};
+
+static void atmel_sha_done_task(unsigned long data)
+{
+ struct atmel_sha_dev *dd = (struct atmel_sha_dev *)data;
+ int err = 0;
+
+ if (!(SHA_FLAGS_BUSY & dd->flags)) {
+ atmel_sha_handle_queue(dd, NULL);
+ return;
+ }
+
+ if (SHA_FLAGS_CPU & dd->flags) {
+ if (SHA_FLAGS_OUTPUT_READY & dd->flags) {
+ dd->flags &= ~SHA_FLAGS_OUTPUT_READY;
+ goto finish;
+ }
+ } else if (SHA_FLAGS_DMA_READY & dd->flags) {
+ if (SHA_FLAGS_DMA_ACTIVE & dd->flags) {
+ dd->flags &= ~SHA_FLAGS_DMA_ACTIVE;
+ atmel_sha_update_dma_stop(dd);
+ if (dd->err) {
+ err = dd->err;
+ goto finish;
+ }
+ }
+ if (SHA_FLAGS_OUTPUT_READY & dd->flags) {
+ /* hash or semi-hash ready */
+ dd->flags &= ~(SHA_FLAGS_DMA_READY |
+ SHA_FLAGS_OUTPUT_READY);
+ err = atmel_sha_update_dma_start(dd);
+ if (err != -EINPROGRESS)
+ goto finish;
+ }
+ }
+ return;
+
+finish:
+ /* finish curent request */
+ atmel_sha_finish_req(dd->req, err);
+}
+
+static irqreturn_t atmel_sha_irq(int irq, void *dev_id)
+{
+ struct atmel_sha_dev *sha_dd = dev_id;
+ u32 reg;
+
+ reg = atmel_sha_read(sha_dd, SHA_ISR);
+ if (reg & atmel_sha_read(sha_dd, SHA_IMR)) {
+ atmel_sha_write(sha_dd, SHA_IDR, reg);
+ if (SHA_FLAGS_BUSY & sha_dd->flags) {
+ sha_dd->flags |= SHA_FLAGS_OUTPUT_READY;
+ if (!(SHA_FLAGS_CPU & sha_dd->flags))
+ sha_dd->flags |= SHA_FLAGS_DMA_READY;
+ tasklet_schedule(&sha_dd->done_task);
+ } else {
+ dev_warn(sha_dd->dev, "SHA interrupt when no active requests.\n");
+ }
+ return IRQ_HANDLED;
+ }
+
+ return IRQ_NONE;
+}
+
+static void atmel_sha_unregister_algs(struct atmel_sha_dev *dd)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(sha_algs); i++)
+ crypto_unregister_ahash(&sha_algs[i]);
+}
+
+static int atmel_sha_register_algs(struct atmel_sha_dev *dd)
+{
+ int err, i, j;
+
+ for (i = 0; i < ARRAY_SIZE(sha_algs); i++) {
+ err = crypto_register_ahash(&sha_algs[i]);
+ if (err)
+ goto err_sha_algs;
+ }
+
+ return 0;
+
+err_sha_algs:
+ for (j = 0; j < i; j++)
+ crypto_unregister_ahash(&sha_algs[j]);
+
+ return err;
+}
+
+static int __devinit atmel_sha_probe(struct platform_device *pdev)
+{
+ struct atmel_sha_dev *sha_dd;
+ struct device *dev = &pdev->dev;
+ struct resource *sha_res;
+ unsigned long sha_phys_size;
+ int err;
+
+ sha_dd = kzalloc(sizeof(struct atmel_sha_dev), GFP_KERNEL);
+ if (sha_dd == NULL) {
+ dev_err(dev, "unable to alloc data struct.\n");
+ err = -ENOMEM;
+ goto sha_dd_err;
+ }
+
+ sha_dd->dev = dev;
+
+ platform_set_drvdata(pdev, sha_dd);
+
+ INIT_LIST_HEAD(&sha_dd->list);
+
+ tasklet_init(&sha_dd->done_task, atmel_sha_done_task,
+ (unsigned long)sha_dd);
+
+ crypto_init_queue(&sha_dd->queue, ATMEL_SHA_QUEUE_LENGTH);
+
+ sha_dd->irq = -1;
+
+ /* Get the base address */
+ sha_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!sha_res) {
+ dev_err(dev, "no MEM resource info\n");
+ err = -ENODEV;
+ goto res_err;
+ }
+ sha_dd->phys_base = sha_res->start;
+ sha_phys_size = resource_size(sha_res);
+
+ /* Get the IRQ */
+ sha_dd->irq = platform_get_irq(pdev, 0);
+ if (sha_dd->irq < 0) {
+ dev_err(dev, "no IRQ resource info\n");
+ err = sha_dd->irq;
+ goto res_err;
+ }
+
+ err = request_irq(sha_dd->irq, atmel_sha_irq, IRQF_SHARED, "atmel-sha",
+ sha_dd);
+ if (err) {
+ dev_err(dev, "unable to request sha irq.\n");
+ goto res_err;
+ }
+
+ /* Initializing the clock */
+ sha_dd->iclk = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(sha_dd->iclk)) {
+ dev_err(dev, "clock intialization failed.\n");
+ err = PTR_ERR(sha_dd->iclk);
+ goto clk_err;
+ }
+
+ sha_dd->io_base = ioremap(sha_dd->phys_base, sha_phys_size);
+ if (!sha_dd->io_base) {
+ dev_err(dev, "can't ioremap\n");
+ err = -ENOMEM;
+ goto sha_io_err;
+ }
+
+ spin_lock(&atmel_sha.lock);
+ list_add_tail(&sha_dd->list, &atmel_sha.dev_list);
+ spin_unlock(&atmel_sha.lock);
+
+ err = atmel_sha_register_algs(sha_dd);
+ if (err)
+ goto err_algs;
+
+ dev_info(dev, "Atmel SHA1/SHA256\n");
+
+ return 0;
+
+err_algs:
+ spin_lock(&atmel_sha.lock);
+ list_del(&sha_dd->list);
+ spin_unlock(&atmel_sha.lock);
+ iounmap(sha_dd->io_base);
+sha_io_err:
+ clk_put(sha_dd->iclk);
+clk_err:
+ free_irq(sha_dd->irq, sha_dd);
+res_err:
+ tasklet_kill(&sha_dd->done_task);
+ kfree(sha_dd);
+ sha_dd = NULL;
+sha_dd_err:
+ dev_err(dev, "initialization failed.\n");
+
+ return err;
+}
+
+static int __devexit atmel_sha_remove(struct platform_device *pdev)
+{
+ static struct atmel_sha_dev *sha_dd;
+
+ sha_dd = platform_get_drvdata(pdev);
+ if (!sha_dd)
+ return -ENODEV;
+ spin_lock(&atmel_sha.lock);
+ list_del(&sha_dd->list);
+ spin_unlock(&atmel_sha.lock);
+
+ atmel_sha_unregister_algs(sha_dd);
+
+ tasklet_kill(&sha_dd->done_task);
+
+ iounmap(sha_dd->io_base);
+
+ clk_put(sha_dd->iclk);
+
+ if (sha_dd->irq >= 0)
+ free_irq(sha_dd->irq, sha_dd);
+
+ kfree(sha_dd);
+ sha_dd = NULL;
+
+ return 0;
+}
+
+static struct platform_driver atmel_sha_driver = {
+ .probe = atmel_sha_probe,
+ .remove = __devexit_p(atmel_sha_remove),
+ .driver = {
+ .name = "atmel_sha",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(atmel_sha_driver);
+
+MODULE_DESCRIPTION("Atmel SHA1/SHA256 hw acceleration support.");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
--
1.7.7.6