crypto: amcc - Add crypt4xx driver

This patch adds support for AMCC ppc4xx security device driver. This is the
initial release that includes the driver framework with AES and SHA1 algorithms
support.

The remaining algorithms will be released in the near future.

Signed-off-by: James Hsiao <jhsiao@amcc.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 293 insertions, 0 deletions

diff --git a/drivers/crypto/amcc/crypto4xx_alg.c b/drivers/crypto/amcc/crypto4xx_alg.c
new file mode 100644
index 00000000000..61b6e1bec8c
--- /dev/null
+++ b/drivers/crypto/amcc/crypto4xx_alg.c
@@ -0,0 +1,293 @@
+/**
+ * AMCC SoC PPC4xx Crypto Driver
+ *
+ * Copyright (c) 2008 Applied Micro Circuits Corporation.
+ * All rights reserved. James Hsiao <jhsiao@amcc.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * This file implements the Linux crypto algorithms.
+ */
+
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock_types.h>
+#include <linux/scatterlist.h>
+#include <linux/crypto.h>
+#include <linux/hash.h>
+#include <crypto/internal/hash.h>
+#include <linux/dma-mapping.h>
+#include <crypto/algapi.h>
+#include <crypto/aes.h>
+#include <crypto/sha.h>
+#include "crypto4xx_reg_def.h"
+#include "crypto4xx_sa.h"
+#include "crypto4xx_core.h"
+
+void set_dynamic_sa_command_0(struct dynamic_sa_ctl *sa, u32 save_h,
+			      u32 save_iv, u32 ld_h, u32 ld_iv, u32 hdr_proc,
+			      u32 h, u32 c, u32 pad_type, u32 op_grp, u32 op,
+			      u32 dir)
+{
+	sa->sa_command_0.w = 0;
+	sa->sa_command_0.bf.save_hash_state = save_h;
+	sa->sa_command_0.bf.save_iv = save_iv;
+	sa->sa_command_0.bf.load_hash_state = ld_h;
+	sa->sa_command_0.bf.load_iv = ld_iv;
+	sa->sa_command_0.bf.hdr_proc = hdr_proc;
+	sa->sa_command_0.bf.hash_alg = h;
+	sa->sa_command_0.bf.cipher_alg = c;
+	sa->sa_command_0.bf.pad_type = pad_type & 3;
+	sa->sa_command_0.bf.extend_pad = pad_type >> 2;
+	sa->sa_command_0.bf.op_group = op_grp;
+	sa->sa_command_0.bf.opcode = op;
+	sa->sa_command_0.bf.dir = dir;
+}
+
+void set_dynamic_sa_command_1(struct dynamic_sa_ctl *sa, u32 cm, u32 hmac_mc,
+			      u32 cfb, u32 esn, u32 sn_mask, u32 mute,
+			      u32 cp_pad, u32 cp_pay, u32 cp_hdr)
+{
+	sa->sa_command_1.w = 0;
+	sa->sa_command_1.bf.crypto_mode31 = (cm & 4) >> 2;
+	sa->sa_command_1.bf.crypto_mode9_8 = cm & 3;
+	sa->sa_command_1.bf.feedback_mode = cfb,
+	sa->sa_command_1.bf.sa_rev = 1;
+	sa->sa_command_1.bf.extended_seq_num = esn;
+	sa->sa_command_1.bf.seq_num_mask = sn_mask;
+	sa->sa_command_1.bf.mutable_bit_proc = mute;
+	sa->sa_command_1.bf.copy_pad = cp_pad;
+	sa->sa_command_1.bf.copy_payload = cp_pay;
+	sa->sa_command_1.bf.copy_hdr = cp_hdr;
+}
+
+int crypto4xx_encrypt(struct ablkcipher_request *req)
+{
+	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
+
+	ctx->direction = DIR_OUTBOUND;
+	ctx->hash_final = 0;
+	ctx->is_hash = 0;
+	ctx->pd_ctl = 0x1;
+
+	return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
+				  req->nbytes, req->info,
+				  get_dynamic_sa_iv_size(ctx));
+}
+
+int crypto4xx_decrypt(struct ablkcipher_request *req)
+{
+	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
+
+	ctx->direction = DIR_INBOUND;
+	ctx->hash_final = 0;
+	ctx->is_hash = 0;
+	ctx->pd_ctl = 1;
+
+	return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
+				  req->nbytes, req->info,
+				  get_dynamic_sa_iv_size(ctx));
+}
+
+/**
+ * AES Functions
+ */
+static int crypto4xx_setkey_aes(struct crypto_ablkcipher *cipher,
+				const u8 *key,
+				unsigned int keylen,
+				unsigned char cm,
+				u8 fb)
+{
+	struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
+	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
+	struct dynamic_sa_ctl *sa;
+	int    rc;
+
+	if (keylen != AES_KEYSIZE_256 &&
+		keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_128) {
+		crypto_ablkcipher_set_flags(cipher,
+				CRYPTO_TFM_RES_BAD_KEY_LEN);
+		return -EINVAL;
+	}
+
+	/* Create SA */
+	if (ctx->sa_in_dma_addr || ctx->sa_out_dma_addr)
+		crypto4xx_free_sa(ctx);
+
+	rc = crypto4xx_alloc_sa(ctx, SA_AES128_LEN + (keylen-16) / 4);
+	if (rc)
+		return rc;
+
+	if (ctx->state_record_dma_addr == 0) {
+		rc = crypto4xx_alloc_state_record(ctx);
+		if (rc) {
+			crypto4xx_free_sa(ctx);
+			return rc;
+		}
+	}
+	/* Setup SA */
+	sa = (struct dynamic_sa_ctl *) ctx->sa_in;
+	ctx->hash_final = 0;
+
+	set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, SA_NOT_SAVE_IV,
+				 SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
+				 SA_NO_HEADER_PROC, SA_HASH_ALG_NULL,
+				 SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
+				 SA_OP_GROUP_BASIC, SA_OPCODE_DECRYPT,
+				 DIR_INBOUND);
+
+	set_dynamic_sa_command_1(sa, cm, SA_HASH_MODE_HASH,
+				 fb, SA_EXTENDED_SN_OFF,
+				 SA_SEQ_MASK_OFF, SA_MC_ENABLE,
+				 SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
+				 SA_NOT_COPY_HDR);
+	crypto4xx_memcpy_le(ctx->sa_in + get_dynamic_sa_offset_key_field(ctx),
+			    key, keylen);
+	sa->sa_contents = SA_AES_CONTENTS | (keylen << 2);
+	sa->sa_command_1.bf.key_len = keylen >> 3;
+	ctx->is_hash = 0;
+	ctx->direction = DIR_INBOUND;
+	memcpy(ctx->sa_in + get_dynamic_sa_offset_state_ptr_field(ctx),
+			(void *)&ctx->state_record_dma_addr, 4);
+	ctx->offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(ctx);
+
+	memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
+	sa = (struct dynamic_sa_ctl *) ctx->sa_out;
+	sa->sa_command_0.bf.dir = DIR_OUTBOUND;
+
+	return 0;
+}
+
+int crypto4xx_setkey_aes_cbc(struct crypto_ablkcipher *cipher,
+			     const u8 *key, unsigned int keylen)
+{
+	return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CBC,
+				    CRYPTO_FEEDBACK_MODE_NO_FB);
+}
+
+/**
+ * HASH SHA1 Functions
+ */
+static int crypto4xx_hash_alg_init(struct crypto_tfm *tfm,
+				   unsigned int sa_len,
+				   unsigned char ha,
+				   unsigned char hm)
+{
+	struct crypto_alg *alg = tfm->__crt_alg;
+	struct crypto4xx_alg *my_alg = crypto_alg_to_crypto4xx_alg(alg);
+	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
+	struct dynamic_sa_ctl *sa;
+	struct dynamic_sa_hash160 *sa_in;
+	int rc;
+
+	ctx->dev   = my_alg->dev;
+	ctx->is_hash = 1;
+	ctx->hash_final = 0;
+
+	/* Create SA */
+	if (ctx->sa_in_dma_addr || ctx->sa_out_dma_addr)
+		crypto4xx_free_sa(ctx);
+
+	rc = crypto4xx_alloc_sa(ctx, sa_len);
+	if (rc)
+		return rc;
+
+	if (ctx->state_record_dma_addr == 0) {
+		crypto4xx_alloc_state_record(ctx);
+		if (!ctx->state_record_dma_addr) {
+			crypto4xx_free_sa(ctx);
+			return -ENOMEM;
+		}
+	}
+
+	tfm->crt_ahash.reqsize = sizeof(struct crypto4xx_ctx);
+	sa = (struct dynamic_sa_ctl *) ctx->sa_in;
+	set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
+				 SA_NOT_LOAD_HASH, SA_LOAD_IV_FROM_SA,
+				 SA_NO_HEADER_PROC, ha, SA_CIPHER_ALG_NULL,
+				 SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
+				 SA_OPCODE_HASH, DIR_INBOUND);
+	set_dynamic_sa_command_1(sa, 0, SA_HASH_MODE_HASH,
+				 CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
+				 SA_SEQ_MASK_OFF, SA_MC_ENABLE,
+				 SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
+				 SA_NOT_COPY_HDR);
+	ctx->direction = DIR_INBOUND;
+	sa->sa_contents = SA_HASH160_CONTENTS;
+	sa_in = (struct dynamic_sa_hash160 *) ctx->sa_in;
+	/* Need to zero hash digest in SA */
+	memset(sa_in->inner_digest, 0, sizeof(sa_in->inner_digest));
+	memset(sa_in->outer_digest, 0, sizeof(sa_in->outer_digest));
+	sa_in->state_ptr = ctx->state_record_dma_addr;
+	ctx->offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(ctx);
+
+	return 0;
+}
+
+int crypto4xx_hash_init(struct ahash_request *req)
+{
+	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
+	int ds;
+	struct dynamic_sa_ctl *sa;
+
+	sa = (struct dynamic_sa_ctl *) ctx->sa_in;
+	ds = crypto_ahash_digestsize(
+			__crypto_ahash_cast(req->base.tfm));
+	sa->sa_command_0.bf.digest_len = ds >> 2;
+	sa->sa_command_0.bf.load_hash_state = SA_LOAD_HASH_FROM_SA;
+	ctx->is_hash = 1;
+	ctx->direction = DIR_INBOUND;
+
+	return 0;
+}
+
+int crypto4xx_hash_update(struct ahash_request *req)
+{
+	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
+
+	ctx->is_hash = 1;
+	ctx->hash_final = 0;
+	ctx->pd_ctl = 0x11;
+	ctx->direction = DIR_INBOUND;
+
+	return crypto4xx_build_pd(&req->base, ctx, req->src,
+				  (struct scatterlist *) req->result,
+				  req->nbytes, NULL, 0);
+}
+
+int crypto4xx_hash_final(struct ahash_request *req)
+{
+	return 0;
+}
+
+int crypto4xx_hash_digest(struct ahash_request *req)
+{
+	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
+
+	ctx->hash_final = 1;
+	ctx->pd_ctl = 0x11;
+	ctx->direction = DIR_INBOUND;
+
+	return crypto4xx_build_pd(&req->base, ctx, req->src,
+				  (struct scatterlist *) req->result,
+				  req->nbytes, NULL, 0);
+}
+
+/**
+ * SHA1 Algorithm
+ */
+int crypto4xx_sha1_alg_init(struct crypto_tfm *tfm)
+{
+	return crypto4xx_hash_alg_init(tfm, SA_HASH160_LEN, SA_HASH_ALG_SHA1,
+				       SA_HASH_MODE_HASH);
+}
+
+