On Thu, 2009-07-23 at 15:41 +0530, Azam Ansari wrote:
> Hi Steve,
>
> When I try to write PLLEN bit in PLLCTL register of PLL1 it crashes.
>
> But When I read it works fine. Can you please suggest me how do I
> write the pll registers?
>
> Below is how I try to write PLL register.
>
> pllcnt = davinci_readl(DAVINCI_PLL_CNTRL0_BASE + PLLCTL);
> davinci_writel(DAVINCI_PLL_CNTRL0_BASE + PLLCTL, pllcnt &
> ~BIT(0));
> udelay(50);
> davinci_writel(DAVINCI_PLL_CNTRL0_BASE + PLLCTL, (pllcnt &
> ~BIT(0)) | PLLRST);
>
>
> Then kernel fails to write:
> davinci_writel(DAVINCI_PLL_CNTRL0_BASE + PLLCTL, pllcnt & ~BIT(0));
>
Try
...
#include <linux/io.h>
...
/* optionally you can use
__raw_readl(IO_ADDRESS(DAVINCI_PLL_CNTRL0_BASE + PLLCTL));
pllcnt = davinci_readl(DAVINCI_PLL_CNTRL0_BASE + PLLCTL);
__raw_writel(pllcnt & ~BIT(0), IO_ADDRESS(DAVINCI_PLL_CNTRL0_BASE +
PLLCTL));
...
Regards,
Steve
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