From mboxrd@z Thu Jan 1 00:00:00 1970 From: Girish K S Subject: [PATCH] mmc: dw_mmc: add busmode selection support Date: Mon, 23 Jul 2012 16:46:40 +0530 Message-ID: <1343042200-19524-1-git-send-email-girish.shivananjappa@linaro.org> Return-path: Received: from mail-pb0-f46.google.com ([209.85.160.46]:41224 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752385Ab2GWLQ4 (ORCPT ); Mon, 23 Jul 2012 07:16:56 -0400 Received: by pbbrp8 with SMTP id rp8so10726907pbb.19 for ; Mon, 23 Jul 2012 04:16:56 -0700 (PDT) Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: linux-mmc@vger.kernel.org Cc: cjb@laptop.org, will.newton@imgtec.com, patches@linaro.org, linux-samsung-soc@vger.kernel.org, Girish K S Synopsis Designware host controller has suppport for open drain mode selection. During the mmc card initialization the host controller can select the open-drain bit to allow the device initialization in the open-drain mode. Once the device enters the standby mode this bit can be reset to enter push-pull mode. Signed-off-by: Girish K S --- drivers/mmc/host/dw_mmc.c | 14 ++++++++++++++ drivers/mmc/host/dw_mmc.h | 1 + 2 files changed, 15 insertions(+), 0 deletions(-) diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 72dc3cd..da11e5a 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -773,6 +773,18 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq) spin_unlock_bh(&host->lock); } +static void dw_mci_set_busmode(struct dw_mci_slot *slot) +{ + struct mmc_ios *ios = &slot->mmc->ios; + u32 reg; + + reg = mci_readl(slot->host, CTRL); + if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) + mci_writel(slot->host, CTRL, reg | SDMMC_CTRL_ENABLE_OD); + else + mci_writel(slot->host, CTRL, reg & ~SDMMC_CTRL_ENABLE_OD); +} + static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) { struct dw_mci_slot *slot = mmc_priv(mmc); @@ -818,6 +830,8 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) default: break; } + + dw_mci_set_busmode(slot); } static int dw_mci_get_ro(struct mmc_host *mmc) diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h index 15c27e1..1a53fb2 100644 --- a/drivers/mmc/host/dw_mmc.h +++ b/drivers/mmc/host/dw_mmc.h @@ -67,6 +67,7 @@ /* Control register defines */ #define SDMMC_CTRL_USE_IDMAC BIT(25) +#define SDMMC_CTRL_ENABLE_OD BIT(24) #define SDMMC_CTRL_CEATA_INT_EN BIT(11) #define SDMMC_CTRL_SEND_AS_CCSD BIT(10) #define SDMMC_CTRL_SEND_CCSD BIT(9) -- 1.7.4.1