From: Girish K S <girish.shivananjappa@linaro.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 <girish.shivananjappa@linaro.org>
Subject: [PATCH] mmc: dw_mmc: add busmode selection support
Date: Mon, 23 Jul 2012 16:46:40 +0530 [thread overview]
Message-ID: <1343042200-19524-1-git-send-email-girish.shivananjappa@linaro.org> (raw)
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 <girish.shivananjappa@linaro.org>
---
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
next reply other threads:[~2012-07-23 11:16 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-23 11:16 Girish K S [this message]
2012-07-24 11:09 ` [PATCH] mmc: dw_mmc: add busmode selection support Jaehoon Chung
2012-07-24 11:36 ` Girish K S
2012-07-24 11:43 ` Girish K S
2012-07-24 13:07 ` Jae hoon Chung
2012-07-24 13:09 ` Girish K S
2012-07-24 13:44 ` Jae hoon Chung
2012-07-25 13:22 ` Girish K S
2012-07-26 3:41 ` Girish K S
2012-07-26 6:00 ` Jaehoon Chung
2012-07-26 6:19 ` Girish K S
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