From patchwork Mon Mar 16 19:01:22 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Corentin Labbe X-Patchwork-Id: 6024151 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 001C79F399 for ; Mon, 16 Mar 2015 19:06:14 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2467C200ED for ; Mon, 16 Mar 2015 19:06:12 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8C89B200E5 for ; Mon, 16 Mar 2015 19:06:04 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1YXaIW-0004zW-4y; Mon, 16 Mar 2015 19:03:32 +0000 Received: from mail-wg0-x22c.google.com ([2a00:1450:400c:c00::22c]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1YXaHI-0004Sw-FB for linux-arm-kernel@lists.infradead.org; Mon, 16 Mar 2015 19:02:23 +0000 Received: by wgdm6 with SMTP id m6so47776570wgd.2 for ; Mon, 16 Mar 2015 12:01:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=xH2cfHErDlYXzinyFZG5EuYjF8kfI89ht5AZJvzE8vw=; b=MONnk+l//oOUW75lnaJYrl8f0frussmQM0t4IFstJb8EmhQsSBR76kmJXvpQyhU6nZ hJ0rlbvQYvNbGZ7gOAMYZQZhzVeg+r3J0g1RNtUav/zWrpaSSNqf8GHzs6aVpUV8FL8W 4fHOREzWP2T6NuToDGFavoL4InJtCKKaOzKydE6bBjVcgaKvpUFJ8B0TvpVO1LWzhylh oaOgt/BBeAY+PO7a0fRCPeX6+acfWKlSQ5L8lsPKgOGk0q78sbi7Yw597EKib20Veg3x B2LxyeSunD9hvzxqVCEVSS12qH44LnDda2q1FcWYnv0vGtqzMOdTvnO4mTRj1LIY8KjE YZEw== X-Received: by 10.194.223.103 with SMTP id qt7mr120304394wjc.35.1426532514608; Mon, 16 Mar 2015 12:01:54 -0700 (PDT) Received: from Red.local (ANice-651-1-372-189.w83-201.abo.wanadoo.fr. [83.201.240.189]) by mx.google.com with ESMTPSA id v13sm16568785wij.10.2015.03.16.12.01.52 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 16 Mar 2015 12:01:53 -0700 (PDT) From: LABBE Corentin To: robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, maxime.ripard@free-electrons.com, linux@arm.linux.org.uk, herbert@gondor.apana.org.au, davem@davemloft.net, akpm@linux-foundation.org, gregkh@linuxfoundation.org, arnd@arndb.de Subject: [PATCH v6 4/4] crypto: Add Allwinner Security System crypto accelerator Date: Mon, 16 Mar 2015 20:01:22 +0100 Message-Id: <1426532482-28830-5-git-send-email-clabbe.montjoie@gmail.com> X-Mailer: git-send-email 2.0.5 In-Reply-To: <1426532482-28830-1-git-send-email-clabbe.montjoie@gmail.com> References: <1426532482-28830-1-git-send-email-clabbe.montjoie@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150316_120217_104432_67521AC0 X-CRM114-Status: GOOD ( 25.76 ) X-Spam-Score: -0.8 (/) Cc: devicetree@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sunxi@googlegroups.com, LABBE Corentin , linux-crypto@vger.kernel.org, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.1 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_MED, T_DKIM_INVALID, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add support for the Security System included in Allwinner SoC A20. The Security System is a hardware cryptographic accelerator that support: - MD5 and SHA1 hash algorithms - AES block cipher in CBC mode with 128/196/256bits keys. - DES and 3DES block cipher in CBC mode Signed-off-by: LABBE Corentin --- drivers/crypto/Kconfig | 17 ++ drivers/crypto/Makefile | 1 + drivers/crypto/sunxi-ss/Makefile | 2 + drivers/crypto/sunxi-ss/sunxi-ss-cipher.c | 408 +++++++++++++++++++++++++ drivers/crypto/sunxi-ss/sunxi-ss-core.c | 339 +++++++++++++++++++++ drivers/crypto/sunxi-ss/sunxi-ss-hash.c | 475 ++++++++++++++++++++++++++++++ drivers/crypto/sunxi-ss/sunxi-ss.h | 200 +++++++++++++ 7 files changed, 1442 insertions(+) create mode 100644 drivers/crypto/sunxi-ss/Makefile create mode 100644 drivers/crypto/sunxi-ss/sunxi-ss-cipher.c create mode 100644 drivers/crypto/sunxi-ss/sunxi-ss-core.c create mode 100644 drivers/crypto/sunxi-ss/sunxi-ss-hash.c create mode 100644 drivers/crypto/sunxi-ss/sunxi-ss.h diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig index 2fb0fdf..9ba9759 100644 --- a/drivers/crypto/Kconfig +++ b/drivers/crypto/Kconfig @@ -436,4 +436,21 @@ config CRYPTO_DEV_QCE hardware. To compile this driver as a module, choose M here. The module will be called qcrypto. +config CRYPTO_DEV_SUNXI_SS + tristate "Support for Allwinner Security System cryptographic accelerator" + depends on ARCH_SUNXI + select CRYPTO_MD5 + select CRYPTO_SHA1 + select CRYPTO_AES + select CRYPTO_DES + select CRYPTO_BLKCIPHER + help + Some Allwinner SoC have a crypto accelerator named + Security System. Select this if you want to use it. + The Security System handle AES/DES/3DES ciphers in CBC mode + and SHA1 and MD5 hash algorithms. + + To compile this driver as a module, choose M here: the module + will be called sunxi-ss. + endif # CRYPTO_HW diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile index 3924f93..856545c 100644 --- a/drivers/crypto/Makefile +++ b/drivers/crypto/Makefile @@ -25,3 +25,4 @@ obj-$(CONFIG_CRYPTO_DEV_TALITOS) += talitos.o obj-$(CONFIG_CRYPTO_DEV_UX500) += ux500/ obj-$(CONFIG_CRYPTO_DEV_QAT) += qat/ obj-$(CONFIG_CRYPTO_DEV_QCE) += qce/ +obj-$(CONFIG_CRYPTO_DEV_SUNXI_SS) += sunxi-ss/ diff --git a/drivers/crypto/sunxi-ss/Makefile b/drivers/crypto/sunxi-ss/Makefile new file mode 100644 index 0000000..8bb287d --- /dev/null +++ b/drivers/crypto/sunxi-ss/Makefile @@ -0,0 +1,2 @@ +obj-$(CONFIG_CRYPTO_DEV_SUNXI_SS) += sunxi-ss.o +sunxi-ss-y += sunxi-ss-core.o sunxi-ss-hash.o sunxi-ss-cipher.o diff --git a/drivers/crypto/sunxi-ss/sunxi-ss-cipher.c b/drivers/crypto/sunxi-ss/sunxi-ss-cipher.c new file mode 100644 index 0000000..3ed0ad0 --- /dev/null +++ b/drivers/crypto/sunxi-ss/sunxi-ss-cipher.c @@ -0,0 +1,408 @@ +/* + * sunxi-ss-cipher.c - hardware cryptographic accelerator for Allwinner A20 SoC + * + * Copyright (C) 2013-2015 Corentin LABBE + * + * This file add support for AES cipher with 128,192,256 bits + * keysize in CBC mode. + * Add support also for DES and 3DES in CBC mode. + * + * You could find the datasheet in Documentation/arm/sunxi/README + * + * 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. + */ +#include "sunxi-ss.h" + +static int sunxi_ss_cipher(struct ablkcipher_request *areq, u32 mode) +{ + struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(areq); + struct sunxi_tfm_ctx *op = crypto_ablkcipher_ctx(tfm); + const char *cipher_type; + struct sunxi_ss_ctx *ss = op->ss; + + if (areq->nbytes == 0) + return 0; + + if (areq->info == NULL) { + dev_err(ss->dev, "ERROR: Empty IV\n"); + return -EINVAL; + } + + if (areq->src == NULL || areq->dst == NULL) { + dev_err(ss->dev, "ERROR: Some SGs are NULL\n"); + return -EINVAL; + } + + cipher_type = crypto_tfm_alg_name(crypto_ablkcipher_tfm(tfm)); + + if (strcmp("cbc(aes)", cipher_type) == 0) { + mode |= SS_OP_AES | SS_CBC | SS_ENABLED | op->keymode; + return sunxi_ss_aes_poll(areq, mode); + } + + if (strcmp("cbc(des)", cipher_type) == 0) { + mode |= SS_OP_DES | SS_CBC | SS_ENABLED | op->keymode; + return sunxi_ss_des_poll(areq, mode); + } + + if (strcmp("cbc(des3_ede)", cipher_type) == 0) { + mode |= SS_OP_3DES | SS_CBC | SS_ENABLED | op->keymode; + return sunxi_ss_des_poll(areq, mode); + } + + dev_err(ss->dev, "ERROR: Cipher %s not handled\n", cipher_type); + return -EINVAL; +} + +int sunxi_ss_cipher_encrypt(struct ablkcipher_request *areq) +{ + return sunxi_ss_cipher(areq, SS_ENCRYPTION); +} + +int sunxi_ss_cipher_decrypt(struct ablkcipher_request *areq) +{ + return sunxi_ss_cipher(areq, SS_DECRYPTION); +} + +int sunxi_ss_cipher_init(struct crypto_tfm *tfm) +{ + const char *name = crypto_tfm_alg_name(tfm); + struct sunxi_tfm_ctx *op = crypto_tfm_ctx(tfm); + struct crypto_alg *alg = tfm->__crt_alg; + struct sunxi_ss_alg_template *algt; + struct sunxi_ss_ctx *ss; + + memset(op, 0, sizeof(struct sunxi_tfm_ctx)); + + algt = container_of(alg, struct sunxi_ss_alg_template, alg.crypto); + ss = algt->ss; + op->ss = algt->ss; + + /* fallback is needed only for DES/3DES */ + if (strcmp("cbc(des)", name) == 0 || + strcmp("cbc(des3_ede)", name) == 0) { + op->fallback = crypto_alloc_ablkcipher(name, 0, + CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK); + if (IS_ERR(op->fallback)) { + dev_err(ss->dev, "ERROR: allocating fallback algo %s\n", + name); + return PTR_ERR(op->fallback); + } + } + return 0; +} + +void sunxi_ss_cipher_exit(struct crypto_tfm *tfm) +{ + struct sunxi_tfm_ctx *ctx = crypto_tfm_ctx(tfm); + + if (ctx->fallback) + crypto_free_ablkcipher(ctx->fallback); + ctx->fallback = NULL; +} + +/* + * Optimized function for the case where we have only one SG, + * so we can use kmap_atomic + */ +static int sunxi_ss_aes_poll_atomic(struct ablkcipher_request *areq) +{ + u32 spaces; + struct scatterlist *in_sg = areq->src; + struct scatterlist *out_sg = areq->dst; + void *src_addr; + void *dst_addr; + unsigned int ileft = areq->nbytes; + unsigned int oleft = areq->nbytes; + unsigned int todo; + u32 *src32; + u32 *dst32; + u32 rx_cnt = 32; + u32 tx_cnt = 0; + int i; + struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(areq); + struct sunxi_tfm_ctx *op = crypto_ablkcipher_ctx(tfm); + struct sunxi_ss_ctx *ss = op->ss; + + src_addr = kmap_atomic(sg_page(in_sg)) + in_sg->offset; + if (src_addr == NULL) { + dev_err(ss->dev, "kmap_atomic error for src SG\n"); + return -EINVAL; + } + + dst_addr = kmap_atomic(sg_page(out_sg)) + out_sg->offset; + if (dst_addr == NULL) { + dev_err(ss->dev, "kmap_atomic error for dst SG\n"); + kunmap_atomic(src_addr); + return -EINVAL; + } + + src32 = (u32 *)src_addr; + dst32 = (u32 *)dst_addr; + ileft = areq->nbytes / 4; + oleft = areq->nbytes / 4; + i = 0; + do { + if (ileft > 0 && rx_cnt > 0) { + todo = min(rx_cnt, ileft); + ileft -= todo; + writesl(ss->base + SS_RXFIFO, src32, todo); + src32 += todo; + } + if (tx_cnt > 0) { + todo = min(tx_cnt, oleft); + oleft -= todo; + readsl(ss->base + SS_TXFIFO, dst32, todo); + dst32 += todo; + } + spaces = readl(ss->base + SS_FCSR); + rx_cnt = SS_RXFIFO_SPACES(spaces); + tx_cnt = SS_TXFIFO_SPACES(spaces); + } while (oleft > 0); + kunmap_atomic(dst_addr); + kunmap_atomic(src_addr); + return 0; +} + +int sunxi_ss_aes_poll(struct ablkcipher_request *areq, u32 mode) +{ + u32 spaces; + struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(areq); + struct sunxi_tfm_ctx *op = crypto_ablkcipher_ctx(tfm); + struct sunxi_ss_ctx *ss = op->ss; + unsigned int ivsize = crypto_ablkcipher_ivsize(tfm); + /* when activating SS, the default FIFO space is 32 */ + u32 rx_cnt = 32; + u32 tx_cnt = 0; + u32 v; + int i, err = 0; + struct scatterlist *in_sg = areq->src; + struct scatterlist *out_sg = areq->dst; + void *src_addr; + void *dst_addr; + unsigned int ileft = areq->nbytes; + unsigned int oleft = areq->nbytes; + unsigned int sgileft = areq->src->length; + unsigned int sgoleft = areq->dst->length; + unsigned int todo; + u32 *src32; + u32 *dst32; + unsigned long flags; + + spin_lock_irqsave(&ss->slock, flags); + + for (i = 0; i < op->keylen; i += 4) + writel(*(op->key + i/4), ss->base + SS_KEY0 + i); + + if (areq->info != NULL) { + for (i = 0; i < 4 && i < ivsize / 4; i++) { + v = *(u32 *)(areq->info + i * 4); + writel(v, ss->base + SS_IV0 + i * 4); + } + } + writel(mode, ss->base + SS_CTL); + + /* If we have only one SG, we can use kmap_atomic */ + if (sg_next(in_sg) == NULL && sg_next(out_sg) == NULL) { + err = sunxi_ss_aes_poll_atomic(areq); + goto release_ss; + } + + /* + * If we have more than one SG, we cannot use kmap_atomic since + * we hold the mapping too long + */ + src_addr = kmap(sg_page(in_sg)) + in_sg->offset; + if (src_addr == NULL) { + dev_err(ss->dev, "KMAP error for src SG\n"); + err = -EINVAL; + goto release_ss; + } + dst_addr = kmap(sg_page(out_sg)) + out_sg->offset; + if (dst_addr == NULL) { + kunmap(sg_page(in_sg)); + dev_err(ss->dev, "KMAP error for dst SG\n"); + err = -EINVAL; + goto release_ss; + } + src32 = (u32 *)src_addr; + dst32 = (u32 *)dst_addr; + ileft = areq->nbytes / 4; + oleft = areq->nbytes / 4; + sgileft = in_sg->length / 4; + sgoleft = out_sg->length / 4; + do { + spaces = readl_relaxed(ss->base + SS_FCSR); + rx_cnt = SS_RXFIFO_SPACES(spaces); + tx_cnt = SS_TXFIFO_SPACES(spaces); + todo = min3(rx_cnt, ileft, sgileft); + if (todo > 0) { + ileft -= todo; + sgileft -= todo; + writesl(ss->base + SS_RXFIFO, src32, todo); + src32 += todo; + } + if (in_sg != NULL && sgileft == 0 && ileft > 0) { + kunmap(sg_page(in_sg)); + in_sg = sg_next(in_sg); + while (in_sg != NULL && in_sg->length == 0) + in_sg = sg_next(in_sg); + if (in_sg != NULL && ileft > 0) { + src_addr = kmap(sg_page(in_sg)) + in_sg->offset; + if (src_addr == NULL) { + dev_err(ss->dev, "ERROR: KMAP for src SG\n"); + err = -EINVAL; + goto release_ss; + } + src32 = src_addr; + sgileft = in_sg->length / 4; + } + } + /* do not test oleft since when oleft == 0 we have finished */ + todo = min3(tx_cnt, oleft, sgoleft); + if (todo > 0) { + oleft -= todo; + sgoleft -= todo; + readsl(ss->base + SS_TXFIFO, dst32, todo); + dst32 += todo; + } + if (out_sg != NULL && sgoleft == 0 && oleft >= 0) { + kunmap(sg_page(out_sg)); + out_sg = sg_next(out_sg); + while (out_sg != NULL && out_sg->length == 0) + out_sg = sg_next(out_sg); + if (out_sg != NULL && oleft > 0) { + dst_addr = kmap(sg_page(out_sg)) + + out_sg->offset; + if (dst_addr == NULL) { + dev_err(ss->dev, "KMAP error\n"); + err = -EINVAL; + goto release_ss; + } + dst32 = dst_addr; + sgoleft = out_sg->length / 4; + } + } + } while (oleft > 0); + +release_ss: + writel_relaxed(0, ss->base + SS_CTL); + spin_unlock_irqrestore(&ss->slock, flags); + return err; +} + +/* Pure CPU driven way of doing DES/3DES with SS */ +int sunxi_ss_des_poll(struct ablkcipher_request *areq, u32 mode) +{ + struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(areq); + struct sunxi_tfm_ctx *op = crypto_ablkcipher_ctx(tfm); + struct sunxi_ss_ctx *ss = op->ss; + int i, err = 0; + int no_chunk = 1; + struct scatterlist *in_sg = areq->src; + struct scatterlist *out_sg = areq->dst; + u8 kkey[256 / 8]; + + /* + * if we have only SGs with size multiple of 4, + * we can use the SS AES function + */ + while (in_sg != NULL && no_chunk == 1) { + if ((in_sg->length % 4) != 0) + no_chunk = 0; + in_sg = sg_next(in_sg); + } + while (out_sg != NULL && no_chunk == 1) { + if ((out_sg->length % 4) != 0) + no_chunk = 0; + out_sg = sg_next(out_sg); + } + + if (no_chunk == 1) + return sunxi_ss_aes_poll(areq, mode); + + /* + * if some SG are not multiple of 4bytes use a fallback + * it is much easy and clean + */ + ablkcipher_request_set_tfm(areq, op->fallback); + for (i = 0; i < op->keylen; i++) + *(u32 *)(kkey + i * 4) = op->key[i]; + + err = crypto_ablkcipher_setkey(op->fallback, kkey, op->keylen); + if (err != 0) { + dev_err(ss->dev, "Cannot set key on fallback\n"); + return -EINVAL; + } + + if ((mode & SS_DECRYPTION) == SS_DECRYPTION) + err = crypto_ablkcipher_decrypt(areq); + else + err = crypto_ablkcipher_encrypt(areq); + ablkcipher_request_set_tfm(areq, tfm); + return err; +} + +/* check and set the AES key, prepare the mode to be used */ +int sunxi_ss_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key, + unsigned int keylen) +{ + struct sunxi_tfm_ctx *op = crypto_ablkcipher_ctx(tfm); + struct sunxi_ss_ctx *ss = op->ss; + + switch (keylen) { + case 128 / 8: + op->keymode = SS_AES_128BITS; + break; + case 192 / 8: + op->keymode = SS_AES_192BITS; + break; + case 256 / 8: + op->keymode = SS_AES_256BITS; + break; + default: + dev_err(ss->dev, "ERROR: Invalid keylen %u\n", keylen); + crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); + return -EINVAL; + } + op->keylen = keylen; + memcpy(op->key, key, keylen); + return 0; +} + +/* check and set the DES key, prepare the mode to be used */ +int sunxi_ss_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key, + unsigned int keylen) +{ + struct sunxi_tfm_ctx *op = crypto_ablkcipher_ctx(tfm); + struct sunxi_ss_ctx *ss = op->ss; + + if (keylen != DES_KEY_SIZE) { + dev_err(ss->dev, "Invalid keylen %u\n", keylen); + crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); + return -EINVAL; + } + op->keylen = keylen; + memcpy(op->key, key, keylen); + return 0; +} + +/* check and set the 3DES key, prepare the mode to be used */ +int sunxi_ss_des3_setkey(struct crypto_ablkcipher *tfm, const u8 *key, + unsigned int keylen) +{ + struct sunxi_tfm_ctx *op = crypto_ablkcipher_ctx(tfm); + struct sunxi_ss_ctx *ss = op->ss; + + if (keylen != 3 * DES_KEY_SIZE) { + dev_err(ss->dev, "Invalid keylen %u\n", keylen); + crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); + return -EINVAL; + } + op->keylen = keylen; + memcpy(op->key, key, keylen); + return 0; +} diff --git a/drivers/crypto/sunxi-ss/sunxi-ss-core.c b/drivers/crypto/sunxi-ss/sunxi-ss-core.c new file mode 100644 index 0000000..024a5d8 --- /dev/null +++ b/drivers/crypto/sunxi-ss/sunxi-ss-core.c @@ -0,0 +1,339 @@ +/* + * sunxi-ss-core.c - hardware cryptographic accelerator for Allwinner A20 SoC + * + * Copyright (C) 2013-2015 Corentin LABBE + * + * Core file which registers crypto algorithms supported by the SS. + * + * You could find a link for the datasheet in Documentation/arm/sunxi/README + * + * 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. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "sunxi-ss.h" + +static struct sunxi_ss_alg_template driver_algs[] = { +{ .type = CRYPTO_ALG_TYPE_AHASH, + .alg.hash = { + .init = sunxi_hash_init, + .update = sunxi_hash_update, + .final = sunxi_hash_final, + .finup = sunxi_hash_finup, + .digest = sunxi_hash_digest, + .export = sunxi_hash_export, + .import = sunxi_hash_import, + .halg = { + .digestsize = MD5_DIGEST_SIZE, + .base = { + .cra_name = "md5", + .cra_driver_name = "md5-sunxi-ss", + .cra_priority = 300, + .cra_alignmask = 3, + .cra_flags = CRYPTO_ALG_TYPE_AHASH | + CRYPTO_ALG_ASYNC, + .cra_blocksize = MD5_HMAC_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct sunxi_req_ctx), + .cra_module = THIS_MODULE, + .cra_type = &crypto_ahash_type, + .cra_init = sunxi_hash_crainit + } + } + } +}, +{ .type = CRYPTO_ALG_TYPE_AHASH, + .alg.hash = { + .init = sunxi_hash_init, + .update = sunxi_hash_update, + .final = sunxi_hash_final, + .finup = sunxi_hash_finup, + .digest = sunxi_hash_digest, + .export = sunxi_hash_export, + .import = sunxi_hash_import, + .halg = { + .digestsize = SHA1_DIGEST_SIZE, + .base = { + .cra_name = "sha1", + .cra_driver_name = "sha1-sunxi-ss", + .cra_priority = 300, + .cra_alignmask = 3, + .cra_flags = CRYPTO_ALG_TYPE_AHASH | + CRYPTO_ALG_ASYNC, + .cra_blocksize = SHA1_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct sunxi_req_ctx), + .cra_module = THIS_MODULE, + .cra_type = &crypto_ahash_type, + .cra_init = sunxi_hash_crainit + } + } + } +}, +{ .type = CRYPTO_ALG_TYPE_ABLKCIPHER, + .alg.crypto = { + .cra_name = "cbc(aes)", + .cra_driver_name = "cbc-aes-sunxi-ss", + .cra_priority = 300, + .cra_blocksize = AES_BLOCK_SIZE, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | + CRYPTO_ALG_ASYNC, + .cra_ctxsize = sizeof(struct sunxi_tfm_ctx), + .cra_module = THIS_MODULE, + .cra_alignmask = 3, + .cra_type = &crypto_ablkcipher_type, + .cra_init = sunxi_ss_cipher_init, + .cra_exit = sunxi_ss_cipher_exit, + .cra_ablkcipher = { + .min_keysize = AES_MIN_KEY_SIZE, + .max_keysize = AES_MAX_KEY_SIZE, + .ivsize = AES_BLOCK_SIZE, + .setkey = sunxi_ss_aes_setkey, + .encrypt = sunxi_ss_cipher_encrypt, + .decrypt = sunxi_ss_cipher_decrypt, + } + } +}, +{ .type = CRYPTO_ALG_TYPE_ABLKCIPHER, + .alg.crypto = { + .cra_name = "cbc(des)", + .cra_driver_name = "cbc-des-sunxi-ss", + .cra_priority = 300, + .cra_blocksize = DES_BLOCK_SIZE, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC | + CRYPTO_ALG_NEED_FALLBACK, + .cra_ctxsize = sizeof(struct sunxi_req_ctx), + .cra_module = THIS_MODULE, + .cra_alignmask = 3, + .cra_type = &crypto_ablkcipher_type, + .cra_init = sunxi_ss_cipher_init, + .cra_exit = sunxi_ss_cipher_exit, + .cra_u.ablkcipher = { + .min_keysize = DES_KEY_SIZE, + .max_keysize = DES_KEY_SIZE, + .ivsize = DES_BLOCK_SIZE, + .setkey = sunxi_ss_des_setkey, + .encrypt = sunxi_ss_cipher_encrypt, + .decrypt = sunxi_ss_cipher_decrypt, + } + } +}, +{ .type = CRYPTO_ALG_TYPE_ABLKCIPHER, + .alg.crypto = { + .cra_name = "cbc(des3_ede)", + .cra_driver_name = "cbc-des3-sunxi-ss", + .cra_priority = 300, + .cra_blocksize = DES3_EDE_BLOCK_SIZE, + .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | + CRYPTO_ALG_ASYNC | + CRYPTO_ALG_NEED_FALLBACK, + .cra_ctxsize = sizeof(struct sunxi_req_ctx), + .cra_module = THIS_MODULE, + .cra_alignmask = 3, + .cra_type = &crypto_ablkcipher_type, + .cra_init = sunxi_ss_cipher_init, + .cra_exit = sunxi_ss_cipher_exit, + .cra_u.ablkcipher = { + .min_keysize = DES3_EDE_KEY_SIZE, + .max_keysize = DES3_EDE_KEY_SIZE, + .ivsize = DES3_EDE_BLOCK_SIZE, + .setkey = sunxi_ss_des3_setkey, + .encrypt = sunxi_ss_cipher_encrypt, + .decrypt = sunxi_ss_cipher_decrypt, + } + } + }, +}; + +static int sunxi_ss_probe(struct platform_device *pdev) +{ + struct resource *res; + u32 v; + int err, i; + unsigned long cr; + const unsigned long cr_ahb = 24 * 1000 * 1000; + const unsigned long cr_mod = 150 * 1000 * 1000; + struct sunxi_ss_ctx *ss; + + if (!pdev->dev.of_node) + return -ENODEV; + + ss = devm_kzalloc(&pdev->dev, sizeof(*ss), GFP_KERNEL); + if (ss == NULL) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + ss->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(ss->base)) { + dev_err(&pdev->dev, "Cannot request MMIO\n"); + return PTR_ERR(ss->base); + } + + ss->ssclk = devm_clk_get(&pdev->dev, "mod"); + if (IS_ERR(ss->ssclk)) { + err = PTR_ERR(ss->ssclk); + dev_err(&pdev->dev, "Cannot get SS clock err=%d\n", err); + return err; + } + dev_dbg(&pdev->dev, "clock ss acquired\n"); + + ss->busclk = devm_clk_get(&pdev->dev, "ahb"); + if (IS_ERR(ss->busclk)) { + err = PTR_ERR(ss->busclk); + dev_err(&pdev->dev, "Cannot get AHB SS clock err=%d\n", err); + return err; + } + dev_dbg(&pdev->dev, "clock ahb_ss acquired\n"); + + /* Enable both clocks */ + err = clk_prepare_enable(ss->busclk); + if (err != 0) { + dev_err(&pdev->dev, "Cannot prepare_enable busclk\n"); + return err; + } + err = clk_prepare_enable(ss->ssclk); + if (err != 0) { + dev_err(&pdev->dev, "Cannot prepare_enable ssclk\n"); + goto error_ssclk; + } + + /* + * Check that clock have the correct rates gived in the datasheet + * Try to set the clock to the maximum allowed + */ + err = clk_set_rate(ss->ssclk, cr_mod); + if (err != 0) { + dev_err(&pdev->dev, "Cannot set clock rate to ssclk\n"); + goto error_clk; + } + + /* + * The only impact on clocks below requirement are bad performance, + * so do not print "errors" + * warn on Overclocked clocks + */ + cr = clk_get_rate(ss->busclk); + if (cr >= cr_ahb) + dev_dbg(&pdev->dev, "Clock bus %lu (%lu MHz) (must be >= %lu)\n", + cr, cr / 1000000, cr_ahb); + else + dev_warn(&pdev->dev, "Clock bus %lu (%lu MHz) (must be >= %lu)\n", + cr, cr / 1000000, cr_ahb); + + cr = clk_get_rate(ss->ssclk); + if (cr <= cr_mod) + if (cr < cr_mod) + dev_warn(&pdev->dev, "Clock ss %lu (%lu MHz) (must be <= %lu)\n", + cr, cr / 1000000, cr_mod); + else + dev_dbg(&pdev->dev, "Clock ss %lu (%lu MHz) (must be <= %lu)\n", + cr, cr / 1000000, cr_mod); + else + dev_warn(&pdev->dev, "Clock ss is at %lu (%lu MHz) (must be <= %lu)\n", + cr, cr / 1000000, cr_mod); + + /* + * Datasheet named it "Die Bonding ID" + * I expect to be a sort of Security System Revision number. + * Since the A80 seems to have an other version of SS + * this info could be useful + */ + writel(SS_ENABLED, ss->base + SS_CTL); + v = readl(ss->base + SS_CTL); + v >>= 16; + v &= 0x07; + dev_info(&pdev->dev, "Die ID %d\n", v); + writel(0, ss->base + SS_CTL); + + ss->dev = &pdev->dev; + + spin_lock_init(&ss->slock); + + for (i = 0; i < ARRAY_SIZE(driver_algs); i++) { + driver_algs[i].ss = ss; + switch (driver_algs[i].type) { + case CRYPTO_ALG_TYPE_ABLKCIPHER: + err = crypto_register_alg(&driver_algs[i].alg.crypto); + if (err != 0) + goto error_alg; + break; + case CRYPTO_ALG_TYPE_AHASH: + err = crypto_register_ahash(&driver_algs[i].alg.hash); + if (err != 0) + goto error_alg; + break; + } + } + platform_set_drvdata(pdev, ss); + return 0; +error_alg: + i--; + for (; i >= 0; i--) { + switch (driver_algs[i].type) { + case CRYPTO_ALG_TYPE_ABLKCIPHER: + crypto_unregister_alg(&driver_algs[i].alg.crypto); + break; + case CRYPTO_ALG_TYPE_AHASH: + crypto_unregister_ahash(&driver_algs[i].alg.hash); + break; + } + } +error_clk: + clk_disable_unprepare(ss->ssclk); +error_ssclk: + clk_disable_unprepare(ss->busclk); + return err; +} + +static int sunxi_ss_remove(struct platform_device *pdev) +{ + int i; + struct sunxi_ss_ctx *ss = platform_get_drvdata(pdev); + + for (i = 0; i < ARRAY_SIZE(driver_algs); i++) { + switch (driver_algs[i].type) { + case CRYPTO_ALG_TYPE_ABLKCIPHER: + crypto_unregister_alg(&driver_algs[i].alg.crypto); + break; + case CRYPTO_ALG_TYPE_AHASH: + crypto_unregister_ahash(&driver_algs[i].alg.hash); + break; + } + } + + writel(0, ss->base + SS_CTL); + clk_disable_unprepare(ss->busclk); + clk_disable_unprepare(ss->ssclk); + return 0; +} + +static const struct of_device_id a20ss_crypto_of_match_table[] = { + { .compatible = "allwinner,sun7i-a20-crypto" }, + {} +}; +MODULE_DEVICE_TABLE(of, a20ss_crypto_of_match_table); + +static struct platform_driver sunxi_ss_driver = { + .probe = sunxi_ss_probe, + .remove = sunxi_ss_remove, + .driver = { + .name = "sunxi-ss", + .of_match_table = a20ss_crypto_of_match_table, + }, +}; + +module_platform_driver(sunxi_ss_driver); + +MODULE_DESCRIPTION("Allwinner Security System cryptographic accelerator"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Corentin LABBE "); diff --git a/drivers/crypto/sunxi-ss/sunxi-ss-hash.c b/drivers/crypto/sunxi-ss/sunxi-ss-hash.c new file mode 100644 index 0000000..28ef59f --- /dev/null +++ b/drivers/crypto/sunxi-ss/sunxi-ss-hash.c @@ -0,0 +1,475 @@ +/* + * sunxi-ss-hash.c - hardware cryptographic accelerator for Allwinner A20 SoC + * + * Copyright (C) 2013-2015 Corentin LABBE + * + * This file add support for MD5 and SHA1. + * + * You could find the datasheet in Documentation/arm/sunxi/README + * + * 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. + */ +#include "sunxi-ss.h" + +/* This is a totaly arbitrary value */ +#define SS_TIMEOUT 100 + +int sunxi_hash_crainit(struct crypto_tfm *tfm) +{ + crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm), + sizeof(struct sunxi_req_ctx)); + return 0; +} + +/* sunxi_hash_init: initialize request context */ +int sunxi_hash_init(struct ahash_request *areq) +{ + const char *hash_type; + struct sunxi_req_ctx *op = ahash_request_ctx(areq); + struct crypto_ahash *tfm = crypto_ahash_reqtfm(areq); + struct ahash_alg *alg = __crypto_ahash_alg(tfm->base.__crt_alg); + struct sunxi_ss_alg_template *algt; + struct sunxi_ss_ctx *ss; + + memset(op, 0, sizeof(struct sunxi_req_ctx)); + + algt = container_of(alg, struct sunxi_ss_alg_template, alg.hash); + ss = algt->ss; + op->ss = algt->ss; + + hash_type = crypto_tfm_alg_name(areq->base.tfm); + + if (strcmp(hash_type, "sha1") == 0) + op->mode = SS_OP_SHA1; + else if (strcmp(hash_type, "md5") == 0) + op->mode = SS_OP_MD5; + else + return -EINVAL; + + return 0; +} + +int sunxi_hash_export(struct ahash_request *areq, void *out) +{ + struct sunxi_req_ctx *op = ahash_request_ctx(areq); + + memcpy(out, op, sizeof(struct sunxi_req_ctx)); + return 0; +} + +int sunxi_hash_import(struct ahash_request *areq, const void *in) +{ + struct sunxi_req_ctx *op = ahash_request_ctx(areq); + + memcpy(op, in, sizeof(struct sunxi_req_ctx)); + return 0; +} + +/* + * sunxi_hash_update: update hash engine + * + * Could be used for both SHA1 and MD5 + * Write data by step of 32bits and put then in the SS. + * + * Since we cannot leave partial data and hash state in the engine, + * we need to get the hash state at the end of this function. + * After some work, I have found that we can get the hash state every 64 bytes + * + * So the first work is to get the number of bytes to write to SS modulo 64 + * The extra bytes will go to two different destination: + * op->wait for full 32bits word + * op->wb (waiting bytes) for partial 32 bits word + * So we can have up to (64/4)-1 op->wait words and 0/1/2/3 bytes in wb + * + * So at the begin of update() + * if op->nwait * 4 + areq->nbytes < 64 + * => all data will be writen to wait buffers and end=0 + * if not, write all nwait to the device and position end to complete to 64bytes + * + * example 1: + * update1 60o => nwait=15 + * update2 60o => need one more word to have 64 bytes + * end=4 + * so write all data in op->wait and one word of SGs + * write remaining data in op->wait + * final state op->nwait=14 + */ +int sunxi_hash_update(struct ahash_request *areq) +{ + u32 v, ivmode = 0; + unsigned int i = 0; + /* + * i is the total bytes read from SGs, to be compared to areq->nbytes + * i is important because we cannot rely on SG length since the sum of + * SG->length could be greater than areq->nbytes + */ + + struct sunxi_req_ctx *op = ahash_request_ctx(areq); + struct sunxi_ss_ctx *ss = op->ss; + struct scatterlist *in_sg; + unsigned int in_i = 0; /* advancement in the current SG */ + u64 end; + /* + * end is the position when we need to stop writing to the device, + * to be compared to i + * So end is always a multiple of 64 + * if end = 0 all data must be kept for later use and no write + * on the device is done. + */ + int in_r, err = 0; + void *src_addr; + unsigned int todo; + u32 spaces, rx_cnt; + unsigned long flags = 0; + + dev_dbg(ss->dev, "%s %s bc=%llu len=%u mode=%x bw=%u ww=%u h0=%0x", + __func__, crypto_tfm_alg_name(areq->base.tfm), + op->byte_count, areq->nbytes, op->mode, + op->nbw, op->nwait, op->hash[0]); + + if (areq->nbytes == 0) + return 0; + + if (areq->nbytes + op->nwait * 4 + op->nbw < 64) + end = 0; + else + end = ((areq->nbytes + op->nwait * 4 + op->nbw) / 64) * 64 + - op->nbw - op->nwait * 4; + + if (end > areq->nbytes || areq->nbytes - end > 63) { + dev_err(ss->dev, "ERROR: Bound error %llu %u\n", + end, areq->nbytes); + return -EINVAL; + } + + if (end > 0) { + spin_lock_irqsave(&ss->slock, flags); + + /* + * if some data have been processed before, + * we need to restore the partial hash state + */ + if (op->byte_count > 0) { + ivmode = SS_IV_ARBITRARY; + for (i = 0; i < 5; i++) + writel(op->hash[i], ss->base + SS_IV0 + i * 4); + } + /* Enable the device */ + writel(op->mode | SS_ENABLED | ivmode, ss->base + SS_CTL); + } + + rx_cnt = 32; + i = 0; + + if (op->nwait > 0 && end > 0) { + /* + * a precedent update was done + * No test versus rx_cnt since op->nwait cannot be more than 15 + */ + writesl(ss->base + SS_RXFIFO, op->wait, op->nwait); + op->byte_count += 4 * op->nwait; + op->nwait = 0; + } + + in_sg = areq->src; + src_addr = kmap(sg_page(in_sg)) + in_sg->offset; + if (src_addr == NULL) { + dev_err(ss->dev, "ERROR: Cannot kmap source buffer\n"); + err = -EFAULT; + goto hash_update_release_ss; + } + do { + /* + * step 1, if some bytes remains from last SG, + * try to complete them to 4 and send that word + */ + if (op->nbw > 0) { + while (op->nbw < 4 && i < areq->nbytes && + in_i < in_sg->length) { + op->wb |= (*(u8 *)(src_addr + in_i)) + << (8 * op->nbw); + dev_dbg(ss->dev, "%s: Complete w=%d wb=%x\n", + __func__, op->nbw, op->wb); + i++; + in_i++; + op->nbw++; + } + if (op->nbw == 4) { + if (i <= end) { + writel(op->wb, ss->base + SS_RXFIFO); + rx_cnt--; + if (rx_cnt > 0) { + spaces = readl_relaxed(ss->base + SS_FCSR); + rx_cnt = SS_RXFIFO_SPACES(spaces); + } + op->byte_count += 4; + } else { + op->wait[op->nwait] = op->wb; + op->nwait++; + dev_dbg(ss->dev, "%s: Keep %u bytes after %llu\n", + __func__, op->nwait, end); + } + op->nbw = 0; + op->wb = 0; + } + } + /* step 2, main loop, read data 4bytes at a time */ + while (i < areq->nbytes && in_i < in_sg->length) { + /* how many bytes we can read from current SG */ + in_r = min(in_sg->length - in_i, areq->nbytes - i); + if (in_r < 4) { + /* Not enough data to write to the device */ + op->wb = 0; + while (in_r > 0) { + op->wb |= (*(u8 *)(src_addr + in_i)) + << (8 * op->nbw); + dev_dbg(ss->dev, "%s: ending bw=%d wb=%x\n", + __func__, op->nbw, op->wb); + in_r--; + i++; + in_i++; + op->nbw++; + } + goto nextsg; + } + v = *(u32 *)(src_addr + in_i); + if (i < end) { + todo = min3((u32)(end - i) / 4, rx_cnt, (u32)in_r / 4); + writesl(ss->base + SS_RXFIFO, src_addr + in_i, todo); + i += 4 * todo; + in_i += 4 * todo; + op->byte_count += 4 * todo; + rx_cnt -= todo; + if (rx_cnt == 0) { + spaces = readl_relaxed(ss->base + SS_FCSR); + rx_cnt = SS_RXFIFO_SPACES(spaces); + } + } else { + op->wait[op->nwait] = v; + i += 4; + in_i += 4; + op->nwait++; + dev_dbg(ss->dev, "%s: Keep word ww=%u after %llu\n", + __func__, op->nwait, end); + if (op->nwait > 15) { + dev_err(ss->dev, "FATAL: Cannot enqueue more, bug?\n"); + err = -EIO; + goto hash_update_release_ss; + } + } + } +nextsg: + /* Nothing more to read in this SG */ + if (in_i == in_sg->length) { + kunmap(sg_page(in_sg)); + do { + in_sg = sg_next(in_sg); + } while (in_sg != NULL && in_sg->length == 0); + in_i = 0; + if (in_sg != NULL) { + src_addr = kmap(sg_page(in_sg)) + in_sg->offset; + if (src_addr == NULL) { + dev_err(ss->dev, "ERROR: Cannot kmap source buffer\n"); + err = -EFAULT; + goto hash_update_release_ss; + } + } + } + } while (in_sg != NULL && i < areq->nbytes); + +hash_update_release_ss: + /* the device was not used, so nothing to release */ + if (end == 0) + return err; + + if (err == 0) { + /* ask the device to finish the hashing */ + writel(op->mode | SS_ENABLED | SS_DATA_END, ss->base + SS_CTL); + i = 0; + do { + v = readl(ss->base + SS_CTL); + i++; + } while (i < SS_TIMEOUT && (v & SS_DATA_END) > 0); + if (i >= SS_TIMEOUT) { + dev_err(ss->dev, "ERROR: %s: hash end timeout after %d loop, CTL=%x\n", + __func__, i, v); + err = -EIO; + goto hash_update_release_ss; + /* + * this seems strange (to go backward) + * but since err is set, it works + * */ + } + + /* get the partial hash only if something was written */ + if (op->mode == SS_OP_SHA1) { + for (i = 0; i < 5; i++) + op->hash[i] = readl(ss->base + SS_MD0 + i * 4); + } else { + for (i = 0; i < 4; i++) + op->hash[i] = readl(ss->base + SS_MD0 + i * 4); + } + } + writel(0, ss->base + SS_CTL); + spin_unlock_irqrestore(&ss->slock, flags); + return err; +} + +/* + * sunxi_hash_final: finalize hashing operation + * + * If we have some remaining bytes, we write them. + * Then ask the SS for finalizing the hashing operation + * + * I do not check RX FIFO size in this function since the size is 32 + * after each enabling and this function neither write more than 32 words. + */ +int sunxi_hash_final(struct ahash_request *areq) +{ + u32 v, ivmode = 0; + unsigned int i; + unsigned int j = 0; + int zeros; + unsigned int index, padlen; + __be64 bits; + struct sunxi_req_ctx *op = ahash_request_ctx(areq); + struct sunxi_ss_ctx *ss = op->ss; + u32 bf[32]; + unsigned long flags; + + dev_dbg(ss->dev, "%s: byte=%llu len=%u mode=%x bw=%u %x h=%x ww=%u", + __func__, op->byte_count, areq->nbytes, op->mode, + op->nbw, op->wb, op->hash[0], op->nwait); + + spin_lock_irqsave(&ss->slock, flags); + + /* + * if we have already writed something, + * restore the partial hash state + */ + if (op->byte_count > 0) { + ivmode = SS_IV_ARBITRARY; + for (i = 0; i < 5; i++) + writel(op->hash[i], ss->base + SS_IV0 + i * 4); + } + writel(op->mode | SS_ENABLED | ivmode, ss->base + SS_CTL); + + /* write the remaining words of the wait buffer */ + if (op->nwait > 0) { + writesl(ss->base + SS_RXFIFO, op->wait, op->nwait); + op->byte_count += 4 * op->nwait; + op->nwait = 0; + } + + /* write the remaining bytes of the nbw buffer */ + if (op->nbw > 0) { + op->wb |= ((1 << 7) << (op->nbw * 8)); + bf[j++] = op->wb; + } else { + bf[j++] = 1 << 7; + } + + /* + * number of space to pad to obtain 64o minus 8(size) minus 4 (final 1) + * I take the operations from other md5/sha1 implementations + */ + + /* we have already send 4 more byte of which nbw data */ + if (op->mode == SS_OP_MD5) { + index = (op->byte_count + 4) & 0x3f; + op->byte_count += op->nbw; + if (index > 56) + zeros = (120 - index) / 4; + else + zeros = (56 - index) / 4; + } else { + op->byte_count += op->nbw; + index = op->byte_count & 0x3f; + padlen = (index < 56) ? (56 - index) : ((64 + 56) - index); + zeros = (padlen - 1) / 4; + } + + /*for (i = 0; i < zeros; i++) + bf[j++] = 0;*/ + memset(bf + j, 0, 4 * zeros); + j += zeros; + + /* write the length of data */ + if (op->mode == SS_OP_SHA1) { + bits = cpu_to_be64(op->byte_count << 3); + bf[j++] = bits & 0xffffffff; + bf[j++] = (bits >> 32) & 0xffffffff; + } else { + bf[j++] = (op->byte_count << 3) & 0xffffffff; + bf[j++] = (op->byte_count >> 29) & 0xffffffff; + } + writesl(ss->base + SS_RXFIFO, bf, j); + + /* Tell the SS to stop the hashing */ + writel(op->mode | SS_ENABLED | SS_DATA_END, ss->base + SS_CTL); + + /* + * Wait for SS to finish the hash. + * The timeout could happend only in case of bad overcloking + * or driver bug. + */ + i = 0; + do { + v = readl(ss->base + SS_CTL); + i++; + } while (i < SS_TIMEOUT && (v & SS_DATA_END) > 0); + if (i >= SS_TIMEOUT) { + dev_err(ss->dev, "ERROR: hash end timeout %d>%d ctl=%x len=%u\n", + i, SS_TIMEOUT, v, areq->nbytes); + writel(0, ss->base + SS_CTL); + spin_unlock_irqrestore(&ss->slock, flags); + return -EIO; + } + + /* Get the hash from the device */ + if (op->mode == SS_OP_SHA1) { + for (i = 0; i < 5; i++) { + v = cpu_to_be32(readl(ss->base + SS_MD0 + i * 4)); + memcpy(areq->result + i * 4, &v, 4); + } + } else { + for (i = 0; i < 4; i++) { + v = readl(ss->base + SS_MD0 + i * 4); + memcpy(areq->result + i * 4, &v, 4); + } + } + writel(0, ss->base + SS_CTL); + spin_unlock_irqrestore(&ss->slock, flags); + return 0; +} + +/* sunxi_hash_finup: finalize hashing operation after an update */ +int sunxi_hash_finup(struct ahash_request *areq) +{ + int err; + + err = sunxi_hash_update(areq); + if (err != 0) + return err; + + return sunxi_hash_final(areq); +} + +/* combo of init/update/final functions */ +int sunxi_hash_digest(struct ahash_request *areq) +{ + int err; + + err = sunxi_hash_init(areq); + if (err != 0) + return err; + + err = sunxi_hash_update(areq); + if (err != 0) + return err; + + return sunxi_hash_final(areq); +} diff --git a/drivers/crypto/sunxi-ss/sunxi-ss.h b/drivers/crypto/sunxi-ss/sunxi-ss.h new file mode 100644 index 0000000..f9f96a1 --- /dev/null +++ b/drivers/crypto/sunxi-ss/sunxi-ss.h @@ -0,0 +1,200 @@ +/* + * sunxi-ss.h - hardware cryptographic accelerator for Allwinner A20 SoC + * + * Copyright (C) 2013-2015 Corentin LABBE + * + * Support AES cipher with 128,192,256 bits keysize. + * Support MD5 and SHA1 hash algorithms. + * Support DES and 3DES + * + * You could find the datasheet in Documentation/arm/sunxi/README + * + * Licensed under the GPL-2. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define SS_CTL 0x00 +#define SS_KEY0 0x04 +#define SS_KEY1 0x08 +#define SS_KEY2 0x0C +#define SS_KEY3 0x10 +#define SS_KEY4 0x14 +#define SS_KEY5 0x18 +#define SS_KEY6 0x1C +#define SS_KEY7 0x20 + +#define SS_IV0 0x24 +#define SS_IV1 0x28 +#define SS_IV2 0x2C +#define SS_IV3 0x30 + +#define SS_CNT0 0x34 +#define SS_CNT1 0x38 +#define SS_CNT2 0x3C +#define SS_CNT3 0x40 + +#define SS_FCSR 0x44 +#define SS_ICSR 0x48 + +#define SS_MD0 0x4C +#define SS_MD1 0x50 +#define SS_MD2 0x54 +#define SS_MD3 0x58 +#define SS_MD4 0x5C + +#define SS_RXFIFO 0x200 +#define SS_TXFIFO 0x204 + +/* SS_CTL configuration values */ + +/* PRNG generator mode - bit 15 */ +#define SS_PRNG_ONESHOT (0 << 15) +#define SS_PRNG_CONTINUE (1 << 15) + +/* IV mode for hash */ +#define SS_IV_ARBITRARY (1 << 14) + +/* SS operation mode - bits 12-13 */ +#define SS_ECB (0 << 12) +#define SS_CBC (1 << 12) +#define SS_CNT (2 << 12) + +/* Counter width for CNT mode - bits 10-11 */ +#define SS_CNT_16BITS (0 << 10) +#define SS_CNT_32BITS (1 << 10) +#define SS_CNT_64BITS (2 << 10) + +/* Key size for AES - bits 8-9 */ +#define SS_AES_128BITS (0 << 8) +#define SS_AES_192BITS (1 << 8) +#define SS_AES_256BITS (2 << 8) + +/* Operation direction - bit 7 */ +#define SS_ENCRYPTION (0 << 7) +#define SS_DECRYPTION (1 << 7) + +/* SS Method - bits 4-6 */ +#define SS_OP_AES (0 << 4) +#define SS_OP_DES (1 << 4) +#define SS_OP_3DES (2 << 4) +#define SS_OP_SHA1 (3 << 4) +#define SS_OP_MD5 (4 << 4) +#define SS_OP_PRNG (5 << 4) + +/* Data end bit - bit 2 */ +#define SS_DATA_END (1 << 2) + +/* PRNG start bit - bit 1 */ +#define SS_PRNG_START (1 << 1) + +/* SS Enable bit - bit 0 */ +#define SS_DISABLED (0 << 0) +#define SS_ENABLED (1 << 0) + +/* SS_FCSR configuration values */ +/* RX FIFO status - bit 30 */ +#define SS_RXFIFO_FREE (1 << 30) + +/* RX FIFO empty spaces - bits 24-29 */ +#define SS_RXFIFO_SPACES(val) (((val) >> 24) & 0x3f) + +/* TX FIFO status - bit 22 */ +#define SS_TXFIFO_AVAILABLE (1 << 22) + +/* TX FIFO available spaces - bits 16-21 */ +#define SS_TXFIFO_SPACES(val) (((val) >> 16) & 0x3f) + +#define SS_RXFIFO_EMP_INT_PENDING (1 << 10) +#define SS_TXFIFO_AVA_INT_PENDING (1 << 8) +#define SS_RXFIFO_EMP_INT_ENABLE (1 << 2) +#define SS_TXFIFO_AVA_INT_ENABLE (1 << 0) + +/* SS_ICSR configuration values */ +#define SS_ICS_DRQ_ENABLE (1 << 4) + +struct sunxi_ss_ctx { + void __iomem *base; + int irq; + struct clk *busclk; + struct clk *ssclk; + struct device *dev; + struct resource *res; + spinlock_t slock; /* control the use of the device */ +}; + +struct sunxi_ss_alg_template { + u32 type; + union { + struct crypto_alg crypto; + struct ahash_alg hash; + } alg; + struct sunxi_ss_ctx *ss; +}; + +struct sunxi_tfm_ctx { + u32 key[AES_MAX_KEY_SIZE / 4];/* divided by sizeof(u32) */ + u32 keylen; + u32 keymode; + struct crypto_ablkcipher *fallback; + struct sunxi_ss_ctx *ss; +}; + +struct sunxi_req_ctx { + u32 mode; + u64 byte_count; /* number of bytes "uploaded" to the device */ + /* wb: partial word waiting to be completed and written to the device */ + u32 wb; + /* number of bytes to be uploaded in the wb word */ + unsigned int nbw; + u32 hash[5]; /* for storing SS_IVx register */ + u32 wait[64]; + unsigned int nwait; + struct sunxi_ss_ctx *ss; +}; + +#define SS_SEED_LEN (192 / 8) +#define SS_DATA_LEN (160 / 8) + +struct prng_context { + u32 seed[SS_SEED_LEN / 4]; + unsigned int slen; +}; + +int sunxi_hash_crainit(struct crypto_tfm *tfm); +int sunxi_hash_init(struct ahash_request *areq); +int sunxi_hash_update(struct ahash_request *areq); +int sunxi_hash_final(struct ahash_request *areq); +int sunxi_hash_finup(struct ahash_request *areq); +int sunxi_hash_digest(struct ahash_request *areq); +int sunxi_hash_export(struct ahash_request *areq, void *out); +int sunxi_hash_import(struct ahash_request *areq, const void *in); + +int sunxi_ss_aes_poll(struct ablkcipher_request *areq, u32 mode); +int sunxi_ss_des_poll(struct ablkcipher_request *areq, u32 mode); +int sunxi_ss_cipher_init(struct crypto_tfm *tfm); +void sunxi_ss_cipher_exit(struct crypto_tfm *tfm); +int sunxi_ss_cipher_encrypt(struct ablkcipher_request *areq); +int sunxi_ss_cipher_decrypt(struct ablkcipher_request *areq); +int sunxi_ss_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key, + unsigned int keylen); +int sunxi_ss_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key, + unsigned int keylen); +int sunxi_ss_des3_setkey(struct crypto_ablkcipher *tfm, const u8 *key, + unsigned int keylen);