From mboxrd@z Thu Jan  1 00:00:00 1970
From: Avik Sil <aviksil@linux.vnet.ibm.com>
Subject: Re: arm: pmu: support pmu/perf on OMAP4 - booting problem on pandaboard
Date: Thu, 07 Apr 2011 14:36:22 +0530
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To: Ming Lei <tom.leiming@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org

Hi Ming,

On Wednesday 06 April 2011 11:37 AM, Ming Lei wrote:
> Hi Avik,
>
> 2011/4/5 Avik Sil<aviksil@linux.vnet.ibm.com>:
>> 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.

Regards,
Avik

>
> thanks,