lkml.org 
[lkml]   [2010]   [Mar]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/2] davinci: MMC: Add a function to control reset state of the controller
Date
From: Chaithrika U S <chaithrika@ti.com>

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

Signed-off-by: Chaithrika U S <chaithrika@ti.com>
Acked-by: Kevin Hilman <khilman@deeprootsystems.com>
---
I thought this series had made it into -mm for 2.6.34, but I guess not.
Here it is again for 2.6.35.
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 547d29c..56afe0a 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)
--
1.7.0.2


\
 
 \ /
  Last update: 2010-03-16 21:37    [from the cache]
©2003-2011 Jasper Spaans