From patchwork Sat Aug 6 12:55:40 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Wahren X-Patchwork-Id: 9266133 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 59C9F6075A for ; Sat, 6 Aug 2016 23:08:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4A2AF2837F for ; Sat, 6 Aug 2016 23:08:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3AAD028414; Sat, 6 Aug 2016 23:08:19 +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=unavailable 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 BAC2D2837F for ; Sat, 6 Aug 2016 23:08:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751665AbcHFXIR (ORCPT ); Sat, 6 Aug 2016 19:08:17 -0400 Received: from mout.kundenserver.de ([217.72.192.75]:56685 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751356AbcHFXIQ (ORCPT ); Sat, 6 Aug 2016 19:08:16 -0400 Received: from localhost.localdomain ([95.91.40.150]) by mrelayeu.kundenserver.de (mreue104) with ESMTPSA (Nemesis) id 0LdVQI-1aoSv02xW6-00ijXZ; Sat, 06 Aug 2016 14:56:12 +0200 From: Stefan Wahren To: Fabio Estevam , Ulf Hansson , Rob Herring , Mark Rutland Cc: Dong Aisheng , Otavio Salvador , Holger Schurig , Shawn Guo , Marek Vasut , Sascha Hauer , linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, Stefan Wahren Subject: [PATCH RFC 3/3] mmc: mxs-mmc: Implement DDR support Date: Sat, 6 Aug 2016 12:55:40 +0000 Message-Id: <1470488140-10104-4-git-send-email-stefan.wahren@i2se.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1470488140-10104-1-git-send-email-stefan.wahren@i2se.com> References: <1470488140-10104-1-git-send-email-stefan.wahren@i2se.com> X-Provags-ID: V03:K0:4UBw4h8wpIWAo2LAyzxJmsmlVzKY0uo+0f5Fu4+QBPyQiFloM1Z V3gJ5Js+2CDiII83z78wPSnfsptEsnrrX3JSvxVkpFIZMC50SOHNu0N721XvJlNWi00nkKW 7woxFELKs+krxyZMH/NFeYRBAxLH24fwHb4C9DZENSRg9js5QbF2LQqYrRzRCDDkqbli8G0 vyWduzJ8n3f3sgNDLo29Q== X-UI-Out-Filterresults: notjunk:1; V01:K0:4grQfKUgoC0=:fkKetB1x4nibI8SQPy9KBL WoAKxZKLxHJxCWPt0qF0PxXdAUUgF9HdZx5ecyczPIdqnJe6Du1JQSvZ/k1UjztwljM6GJLoz 6rk5njW7ZsGlMdcPOmMMNnGiAnL//fn5Tfv7BaxoICh4/uBQ54Q8kslcRVONGM50eTRVlXn7d sbx7QqwbCI8NsYwNbxVdk8WYhM01m8MqdShKDqpV5x3k7I5LZtcAc4IlJUFzk9S8lvWNwXhF8 pOPQPVg04mf686oIW7wGpPjqJ1Vusr7USCOE41VoTPiMIWrYF58vzsUrwAMuyDhH6Wialiud1 hnAmmcTes8JqxHEl6pOvGCSRjwxKvg388OOaOZx1WMklLdO0p3DdH+PmaPSzEhlqVQsDzdRo2 R74aUMCdnBTKLBrN49I4TcPYfuc6ECHmxMaKOMXQPxi2Bm2+CKvy7ZJxHF+rvn5UzKpQTaO8U dl2Bj19RUJFqN7PkRzScFQyf/vVGCn2pE3uDDqC+Q4zypyl8BZVB8Hr4YR615bIAEj6Gb4DaN y+ZPmxUE8iYog5ZLV1Tt6bm8kDE7VMnIgeLnjoSROqbARicFl/0OWOAetvForTuHoIviGNFtI PO+whBsiKxVLvxqdG1Vgc22mH7y4jMozXABL1DWVIAutcnVFDOsrGj64HIqje6yhax8OLtQGg YUSmntOBeT2zJHzheI26+sP2HPQRYVayTZWbmN1/n/k+YUOpADYCPHtytyYCP328IJbs= Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch implements driver support for 3.3V DDR eMMCs. Signed-off-by: Stefan Wahren --- drivers/mmc/host/mxs-mmc.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c index d839147..84019d5 100644 --- a/drivers/mmc/host/mxs-mmc.c +++ b/drivers/mmc/host/mxs-mmc.c @@ -71,6 +71,7 @@ struct mxs_mmc_host { spinlock_t lock; int sdio_irq_en; bool broken_cd; + bool is_ddr; }; static int mxs_mmc_get_cd(struct mmc_host *mmc) @@ -411,6 +412,9 @@ static void mxs_mmc_adtc(struct mxs_mmc_host *host) cmd0 |= BF_SSP(log2_blksz, CMD0_BLOCK_SIZE) | BF_SSP(blocks - 1, CMD0_BLOCK_COUNT); } else { + if (host->is_ddr) + cmd0 |= BM_SSP_CMD0_DBL_DATA_RATE_EN; + writel(data_size, ssp->base + HW_SSP_XFER_SIZE); writel(BF_SSP(log2_blksz, BLOCK_SIZE_BLOCK_SIZE) | BF_SSP(blocks - 1, BLOCK_SIZE_BLOCK_COUNT), @@ -499,6 +503,7 @@ static void mxs_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) static void mxs_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) { struct mxs_mmc_host *host = mmc_priv(mmc); + struct mxs_ssp *ssp = &host->ssp; if (ios->bus_width == MMC_BUS_WIDTH_8) host->bus_width = 2; @@ -509,6 +514,23 @@ static void mxs_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) if (ios->clock) mxs_ssp_set_clk_rate(&host->ssp, ios->clock); + + if (ssp_is_old(ssp)) + return; + + if (ios->timing == MMC_TIMING_MMC_DDR52) { + /* + * ENGR00133481-1: In DDR mode the host send the data at + * negative edge and the MMC receive the data at positive edge. + */ + host->is_ddr = true; + writel(BM_SSP_CTRL1_POLARITY, ssp->base + + HW_SSP_CTRL1(ssp) + STMP_OFFSET_REG_CLR); + } else { + host->is_ddr = false; + writel(BM_SSP_CTRL1_POLARITY, ssp->base + HW_SSP_CTRL1(ssp) + + STMP_OFFSET_REG_SET); + } } static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)