From patchwork Thu Dec 22 16:37:57 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cyrille Pitchen X-Patchwork-Id: 9485351 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 6CE1D601C0 for ; Thu, 22 Dec 2016 16:41:02 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5F87B28066 for ; Thu, 22 Dec 2016 16:41:02 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5406F2816B; Thu, 22 Dec 2016 16:41:02 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 0202228066 for ; Thu, 22 Dec 2016 16:41:02 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1cK6P5-00056L-HH; Thu, 22 Dec 2016 16:39:39 +0000 Received: from exsmtp02.microchip.com ([198.175.253.38] helo=email.microchip.com) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1cK6Nn-0003x3-My for linux-arm-kernel@lists.infradead.org; Thu, 22 Dec 2016 16:38:21 +0000 Received: from tenerife.corp.atmel.com (10.10.76.4) by chn-sv-exch02.mchp-main.com (10.10.76.38) with Microsoft SMTP Server id 14.3.181.6; Thu, 22 Dec 2016 09:38:08 -0700 From: Cyrille Pitchen To: , , Subject: [PATCH v2 08/12] crypto: atmel-sha: add simple DMA transfers Date: Thu, 22 Dec 2016 17:37:57 +0100 Message-ID: <4c438dc06f85e151dea4a42078d5e1d32d4829c1.1482424395.git.cyrille.pitchen@atmel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: MIME-Version: 1.0 X-Brightmail-Tracker: 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20161222_083819_977593_32B6F0C9 X-CRM114-Status: GOOD ( 12.59 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Cyrille Pitchen , linux-crypto@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds a simple function to perform data transfer with the DMA controller. Signed-off-by: Cyrille Pitchen --- drivers/crypto/atmel-sha.c | 116 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 116 insertions(+) diff --git a/drivers/crypto/atmel-sha.c b/drivers/crypto/atmel-sha.c index 58d9ca8ac0f2..a4fc60b67099 100644 --- a/drivers/crypto/atmel-sha.c +++ b/drivers/crypto/atmel-sha.c @@ -123,6 +123,9 @@ struct atmel_sha_ctx { struct atmel_sha_dma { struct dma_chan *chan; struct dma_slave_config dma_conf; + struct scatterlist *sg; + int nents; + unsigned int last_sg_length; }; struct atmel_sha_dev { @@ -1321,6 +1324,119 @@ static irqreturn_t atmel_sha_irq(int irq, void *dev_id) } +/* DMA transfer functions */ + +static bool atmel_sha_dma_check_aligned(struct atmel_sha_dev *dd, + struct scatterlist *sg, + size_t len) +{ + struct atmel_sha_dma *dma = &dd->dma_lch_in; + struct ahash_request *req = dd->req; + struct atmel_sha_reqctx *ctx = ahash_request_ctx(req); + size_t bs = ctx->block_size; + int nents; + + for (nents = 0; sg; sg = sg_next(sg), ++nents) { + if (!IS_ALIGNED(sg->offset, sizeof(u32))) + return false; + + /* + * This is the last sg, the only one that is allowed to + * have an unaligned length. + */ + if (len <= sg->length) { + dma->nents = nents + 1; + dma->last_sg_length = sg->length; + sg->length = ALIGN(len, sizeof(u32)); + return true; + } + + /* All other sg lengths MUST be aligned to the block size. */ + if (!IS_ALIGNED(sg->length, bs)) + return false; + + len -= sg->length; + } + + return false; +} + +static void atmel_sha_dma_callback2(void *data) +{ + struct atmel_sha_dev *dd = data; + struct atmel_sha_dma *dma = &dd->dma_lch_in; + struct scatterlist *sg; + int nents; + + dmaengine_terminate_all(dma->chan); + dma_unmap_sg(dd->dev, dma->sg, dma->nents, DMA_TO_DEVICE); + + sg = dma->sg; + for (nents = 0; nents < dma->nents - 1; ++nents) + sg = sg_next(sg); + sg->length = dma->last_sg_length; + + dd->is_async = true; + (void)atmel_sha_wait_for_data_ready(dd, dd->resume); +} + +static int atmel_sha_dma_start(struct atmel_sha_dev *dd, + struct scatterlist *src, + size_t len, + atmel_sha_fn_t resume) +{ + struct atmel_sha_dma *dma = &dd->dma_lch_in; + struct dma_slave_config *config = &dma->dma_conf; + struct dma_chan *chan = dma->chan; + struct dma_async_tx_descriptor *desc; + dma_cookie_t cookie; + unsigned int sg_len; + int err; + + dd->resume = resume; + + /* + * dma->nents has already been initialized by + * atmel_sha_dma_check_aligned(). + */ + dma->sg = src; + sg_len = dma_map_sg(dd->dev, dma->sg, dma->nents, DMA_TO_DEVICE); + if (!sg_len) { + err = -ENOMEM; + goto exit; + } + + config->src_maxburst = 16; + config->dst_maxburst = 16; + err = dmaengine_slave_config(chan, config); + if (err) + goto unmap_sg; + + desc = dmaengine_prep_slave_sg(chan, dma->sg, sg_len, DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!desc) { + err = -ENOMEM; + goto unmap_sg; + } + + desc->callback = atmel_sha_dma_callback2; + desc->callback_param = dd; + cookie = dmaengine_submit(desc); + err = dma_submit_error(cookie); + if (err) + goto unmap_sg; + + dma_async_issue_pending(chan); + + return -EINPROGRESS; + +unmap_sg: + dma_unmap_sg(dd->dev, dma->sg, dma->nents, DMA_TO_DEVICE); +exit: + return atmel_sha_complete(dd, err); +} + + /* CPU transfer functions */ static int atmel_sha_cpu_transfer(struct atmel_sha_dev *dd)