linux-kernel - [PATCH 1/2] davinci: MMC: Add a function to control reset state of the controller

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Message-Id: <1261052091-14379-1-git-send-email-chaithrika@ti.com>
Date:	Thu, 17 Dec 2009 17:44:51 +0530
From:	Chaithrika U S <chaithrika@...com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org,
	davinci-linux-open-source@...ux.davincidsp.com,
	khilman@...prootsystems.com, Chaithrika U S <chaithrika@...com>
Subject: [PATCH 1/2] davinci: MMC: Add a function to control reset state of the controller

Add a helper function which will aid in changing the reset
status of the controller.

Signed-off-by: Chaithrika U S <chaithrika@...com>
---
Applies to Linus' kernel tree.

 drivers/mmc/host/davinci_mmc.c |   37 ++++++++++++++++---------------------
 1 files changed, 16 insertions(+), 21 deletions(-)

diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
index dd45e7c..25645bf 100644
--- a/drivers/mmc/host/davinci_mmc.c
+++ b/drivers/mmc/host/davinci_mmc.c
@@ -884,19 +884,26 @@ static void mmc_davinci_cmd_done(struct mmc_davinci_host *host,
 	}
 }
 
-static void
-davinci_abort_data(struct mmc_davinci_host *host, struct mmc_data *data)
+static inline void mmc_davinci_reset_ctrl(struct mmc_davinci_host *host,
+								int val)
 {
 	u32 temp;
 
-	/* reset command and data state machines */
 	temp = readl(host->base + DAVINCI_MMCCTL);
-	writel(temp | MMCCTL_CMDRST | MMCCTL_DATRST,
-		host->base + DAVINCI_MMCCTL);
+	if (val)	/* reset */
+		temp |= MMCCTL_CMDRST | MMCCTL_DATRST;
+	else		/* enable */
+		temp &= ~(MMCCTL_CMDRST | MMCCTL_DATRST);
 
-	temp &= ~(MMCCTL_CMDRST | MMCCTL_DATRST);
-	udelay(10);
 	writel(temp, host->base + DAVINCI_MMCCTL);
+	udelay(10);
+}
+
+static void
+davinci_abort_data(struct mmc_davinci_host *host, struct mmc_data *data)
+{
+	mmc_davinci_reset_ctrl(host, 1);
+	mmc_davinci_reset_ctrl(host, 0);
 }
 
 static irqreturn_t mmc_davinci_irq(int irq, void *dev_id)
@@ -1100,15 +1107,8 @@ static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host)
 #endif
 static void __init init_mmcsd_host(struct mmc_davinci_host *host)
 {
-	/* DAT line portion is diabled and in reset state */
-	writel(readl(host->base + DAVINCI_MMCCTL) | MMCCTL_DATRST,
-		host->base + DAVINCI_MMCCTL);
-
-	/* CMD line portion is diabled and in reset state */
-	writel(readl(host->base + DAVINCI_MMCCTL) | MMCCTL_CMDRST,
-		host->base + DAVINCI_MMCCTL);
 
-	udelay(10);
+	mmc_davinci_reset_ctrl(host, 1);
 
 	writel(0, host->base + DAVINCI_MMCCLK);
 	writel(MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK);
@@ -1116,12 +1116,7 @@ static void __init init_mmcsd_host(struct mmc_davinci_host *host)
 	writel(0x1FFF, host->base + DAVINCI_MMCTOR);
 	writel(0xFFFF, host->base + DAVINCI_MMCTOD);
 
-	writel(readl(host->base + DAVINCI_MMCCTL) & ~MMCCTL_DATRST,
-		host->base + DAVINCI_MMCCTL);
-	writel(readl(host->base + DAVINCI_MMCCTL) & ~MMCCTL_CMDRST,
-		host->base + DAVINCI_MMCCTL);
-
-	udelay(10);
+	mmc_davinci_reset_ctrl(host, 0);
 }
 
 static int __init davinci_mmcsd_probe(struct platform_device *pdev)
-- 
1.5.6

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