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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>
This commit is contained in:
Chaithrika U S 2010-05-26 14:41:57 -07:00 committed by Linus Torvalds
parent e632c45ad0
commit 06de845f72
1 changed files with 16 additions and 21 deletions
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37
drivers/mmc/host/davinci_mmc.c
View File

@ -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)