crypto/fsl - Add progressive hashing support using hardware acceleration.

Currently only normal hashing is supported using hardware acceleration.
Added support for progressive hashing using hardware.

Signed-off-by: Ruchika Gupta <ruchika.gupta@freescale.com>
Signed-off-by: Gaurav Rana <gaurav.rana@freescale.com>
CC: Simon Glass <sjg@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: York Sun <yorksun@freescale.com>

2 files changed, 171 insertions, 1 deletions

diff --git a/drivers/crypto/fsl/fsl_hash.c b/drivers/crypto/fsl/fsl_hash.c
index d77f257..c298404 100644
--- a/drivers/crypto/fsl/fsl_hash.c
+++ b/drivers/crypto/fsl/fsl_hash.c
@@ -10,6 +10,9 @@
 #include "jobdesc.h"
 #include "desc.h"
 #include "jr.h"
+#include "fsl_hash.h"
+#include <hw_sha.h>
+#include <asm-generic/errno.h>
 
 #define CRYPTO_MAX_ALG_NAME	80
 #define SHA1_DIGEST_SIZE        20
@@ -39,6 +42,122 @@ static struct caam_hash_template driver_hash[] = {
 	},
 };
 
+static enum caam_hash_algos get_hash_type(struct hash_algo *algo)
+{
+	if (!strcmp(algo->name, driver_hash[SHA1].name))
+		return SHA1;
+	else
+		return SHA256;
+}
+
+/* Create the context for progressive hashing using h/w acceleration.
+ *
+ * @ctxp: Pointer to the pointer of the context for hashing
+ * @caam_algo: Enum for SHA1 or SHA256
+ * @return 0 if ok, -ENOMEM on error
+ */
+static int caam_hash_init(void **ctxp, enum caam_hash_algos caam_algo)
+{
+	*ctxp = calloc(1, sizeof(struct sha_ctx));
+	if (*ctxp == NULL) {
+		debug("Cannot allocate memory for context\n");
+		return -ENOMEM;
+	}
+	return 0;
+}
+
+/*
+ * Update sg table for progressive hashing using h/w acceleration
+ *
+ * The context is freed by this function if an error occurs.
+ * We support at most 32 Scatter/Gather Entries.
+ *
+ * @hash_ctx: Pointer to the context for hashing
+ * @buf: Pointer to the buffer being hashed
+ * @size: Size of the buffer being hashed
+ * @is_last: 1 if this is the last update; 0 otherwise
+ * @caam_algo: Enum for SHA1 or SHA256
+ * @return 0 if ok, -EINVAL on error
+ */
+static int caam_hash_update(void *hash_ctx, const void *buf,
+			    unsigned int size, int is_last,
+			    enum caam_hash_algos caam_algo)
+{
+	uint32_t final = 0;
+	dma_addr_t addr = virt_to_phys((void *)buf);
+	struct sha_ctx *ctx = hash_ctx;
+
+	if (ctx->sg_num >= MAX_SG_32) {
+		free(ctx);
+		return -EINVAL;
+	}
+
+#ifdef CONFIG_PHYS_64BIT
+	ctx->sg_tbl[ctx->sg_num].addr_hi = addr >> 32;
+#else
+	ctx->sg_tbl[ctx->sg_num].addr_hi = 0x0;
+#endif
+	ctx->sg_tbl[ctx->sg_num].addr_lo = addr;
+
+	sec_out32(&ctx->sg_tbl[ctx->sg_num].len_flag,
+		  (size & SG_ENTRY_LENGTH_MASK));
+
+	ctx->sg_num++;
+
+	if (is_last) {
+		final = sec_in32(&ctx->sg_tbl[ctx->sg_num - 1].len_flag) |
+			SG_ENTRY_FINAL_BIT;
+		sec_out32(&ctx->sg_tbl[ctx->sg_num - 1].len_flag, final);
+	}
+
+	return 0;
+}
+
+/*
+ * Perform progressive hashing on the given buffer and copy hash at
+ * destination buffer
+ *
+ * The context is freed after completion of hash operation.
+ *
+ * @hash_ctx: Pointer to the context for hashing
+ * @dest_buf: Pointer to the destination buffer where hash is to be copied
+ * @size: Size of the buffer being hashed
+ * @caam_algo: Enum for SHA1 or SHA256
+ * @return 0 if ok, -EINVAL on error
+ */
+static int caam_hash_finish(void *hash_ctx, void *dest_buf,
+			    int size, enum caam_hash_algos caam_algo)
+{
+	uint32_t len = 0;
+	struct sha_ctx *ctx = hash_ctx;
+	int i = 0, ret = 0;
+
+	if (size < driver_hash[caam_algo].digestsize) {
+		free(ctx);
+		return -EINVAL;
+	}
+
+	for (i = 0; i < ctx->sg_num; i++)
+		len += (sec_in32(&ctx->sg_tbl[i].len_flag) &
+			SG_ENTRY_LENGTH_MASK);
+
+	inline_cnstr_jobdesc_hash(ctx->sha_desc, (uint8_t *)ctx->sg_tbl, len,
+				  ctx->hash,
+				  driver_hash[caam_algo].alg_type,
+				  driver_hash[caam_algo].digestsize,
+				  1);
+
+	ret = run_descriptor_jr(ctx->sha_desc);
+
+	if (ret)
+		debug("Error %x\n", ret);
+	else
+		memcpy(dest_buf, ctx->hash, sizeof(ctx->hash));
+
+	free(ctx);
+	return ret;
+}
+
 int caam_hash(const unsigned char *pbuf, unsigned int buf_len,
 	      unsigned char *pout, enum caam_hash_algos algo)
 {
@@ -48,7 +167,7 @@ int caam_hash(const unsigned char *pbuf, unsigned int buf_len,
 	desc = malloc(sizeof(int) * MAX_CAAM_DESCSIZE);
 	if (!desc) {
 		debug("Not enough memory for descriptor allocation\n");
-		return -1;
+		return -ENOMEM;
 	}
 
 	inline_cnstr_jobdesc_hash(desc, pbuf, buf_len, pout,
@@ -75,3 +194,20 @@ void hw_sha1(const unsigned char *pbuf, unsigned int buf_len,
 	if (caam_hash(pbuf, buf_len, pout, SHA1))
 		printf("CAAM was not setup properly or it is faulty\n");
 }
+
+int hw_sha_init(struct hash_algo *algo, void **ctxp)
+{
+	return caam_hash_init(ctxp, get_hash_type(algo));
+}
+
+int hw_sha_update(struct hash_algo *algo, void *ctx, const void *buf,
+			    unsigned int size, int is_last)
+{
+	return caam_hash_update(ctx, buf, size, is_last, get_hash_type(algo));
+}
+
+int hw_sha_finish(struct hash_algo *algo, void *ctx, void *dest_buf,
+		     int size)
+{
+	return caam_hash_finish(ctx, dest_buf, size, get_hash_type(algo));
+}
diff --git a/drivers/crypto/fsl/fsl_hash.h b/drivers/crypto/fsl/fsl_hash.h
new file mode 100644
index 0000000..f5be651
--- /dev/null
+++ b/drivers/crypto/fsl/fsl_hash.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2014 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ */
+
+#ifndef _SHA_H
+#define _SHA_H
+
+#include <fsl_sec.h>
+#include <hash.h>
+#include "jr.h"
+
+/* We support at most 32 Scatter/Gather Entries.*/
+#define MAX_SG_32	32
+
+/*
+ * Hash context contains the following fields
+ * @sha_desc: Sha Descriptor
+ * @sg_num: number of entries in sg table
+ * @len: total length of buffer
+ * @sg_tbl: sg entry table
+ * @hash: index to the hash calculated
+ */
+struct sha_ctx {
+	uint32_t sha_desc[64];
+	uint32_t sg_num;
+	uint32_t len;
+	struct sg_entry sg_tbl[MAX_SG_32];
+	u8 hash[HASH_MAX_DIGEST_SIZE];
+};
+
+#endif