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@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Cc: Vipin Bhandari <vipin.bhandari@ti.com>
Cc: Sudhakar Rajashekhara <sudhakar.raj@ti.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 16 insertions, 21 deletions

diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
index 547d29c31b40..56afe0a00f56 100644
--- a/drivers/mmc/host/davinci_mmc.c
+++ b/drivers/mmc/host/davinci_mmc.c
@@ -909,19 +909,26 @@ 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)
@@ -1125,15 +1132,8 @@ 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);
@@ -1141,12 +1141,7 @@ 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)