From patchwork Thu Jan 26 16:07:50 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cyrille Pitchen X-Patchwork-Id: 9539657 X-Patchwork-Delegate: herbert@gondor.apana.org.au 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 83DFC60429 for ; Thu, 26 Jan 2017 16:14:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 73B6426E96 for ; Thu, 26 Jan 2017 16:14:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6874E27D4D; Thu, 26 Jan 2017 16:14:04 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1A47926E96 for ; Thu, 26 Jan 2017 16:14:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752825AbdAZQNv (ORCPT ); Thu, 26 Jan 2017 11:13:51 -0500 Received: from smtpout.microchip.com ([198.175.253.82]:35469 "EHLO email.microchip.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752702AbdAZQNF (ORCPT ); Thu, 26 Jan 2017 11:13:05 -0500 Received: from tenerife.corp.atmel.com (10.10.76.4) by chn-sv-exch06.mchp-main.com (10.10.76.107) with Microsoft SMTP Server id 14.3.181.6; Thu, 26 Jan 2017 09:10:46 -0700 From: Cyrille Pitchen To: , , CC: , , , , Cyrille Pitchen Subject: [PATCH v3 05/12] crypto: atmel-sha: add atmel_sha_wait_for_data_ready() Date: Thu, 26 Jan 2017 17:07:50 +0100 Message-ID: <6dfd52ed532de56f5bcc3857b8bd96029360089e.1485443478.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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 CZTScVUDAAA= Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch simply defines a helper function to test the 'Data Ready' flag of the Status Register. It also gives a chance for the crypto request to be processed synchronously if this 'Data Ready' flag is already set when polling the Status Register. Indeed, running synchronously avoid the latency of the 'Data Ready' interrupt. When the 'Data Ready' flag has not been set yet, we enable the associated interrupt and resume processing the crypto request asynchronously from the 'done' task just as before. Signed-off-by: Cyrille Pitchen --- drivers/crypto/atmel-sha.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/crypto/atmel-sha.c b/drivers/crypto/atmel-sha.c index b29a4e5bc404..be0d72cf4352 100644 --- a/drivers/crypto/atmel-sha.c +++ b/drivers/crypto/atmel-sha.c @@ -434,6 +434,19 @@ static void atmel_sha_write_ctrl(struct atmel_sha_dev *dd, int dma) atmel_sha_write(dd, SHA_MR, valmr); } +static inline int atmel_sha_wait_for_data_ready(struct atmel_sha_dev *dd, + atmel_sha_fn_t resume) +{ + u32 isr = atmel_sha_read(dd, SHA_ISR); + + if (unlikely(isr & SHA_INT_DATARDY)) + return resume(dd); + + dd->resume = resume; + atmel_sha_write(dd, SHA_IER, SHA_INT_DATARDY); + return -EINPROGRESS; +} + static int atmel_sha_xmit_cpu(struct atmel_sha_dev *dd, const u8 *buf, size_t length, int final) {