arm: pmu: support pmu/perf on OMAP4 - booting problem on pandaboard

Avik Sil aviksil at
Thu Apr 7 05:06:22 EDT 2011

Hi Ming,

On Wednesday 06 April 2011 11:37 AM, Ming Lei wrote:
> Hi Avik,
> 2011/4/5 Avik Sil<aviksil at>:
>> Even after using ioremapped addresses in omap_writel() I'm getting the oops.
>> Can you please point me to the location in mainline, where these l3 clocks
>> are enabled?
> I guess you can find here:
>           l3_main_3_ick&&  l3_instr_ick: arch/arm/mach-omap2/clock44xx_data.c
> the clocks are set as ENABLE_ON_INIT.

Those clocks are also set ENABLE_ON_INIT in the linaro kernel. But still 
it's hanging at "val = __raw_readl(base + LOCKSTATUS);" in cti_unlock(), 
even after explicitly enabling it using:

omap_writel(1, CM_L3INSTR_L3_3_CLKCTRL);
omap_writel(1, CM_L3INSTR_L3_INSTR_CLKCTRL);
omap_writel(2, CM_EMU_CLKSTCTRL);
while ((omap_readl(CM_EMU_CLKSTCTRL) & 0x300) != 0x300);

BTW, the oops were fixed by replacing omap_writel with __raw_writel.


> thanks,

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