Re: [PATCH v3 05/10] ARM: tegra: rework Tegra secondary CPU core bringup
From: Colin Cross
Date: Mon Feb 20 2012 - 18:04:59 EST
On Thu, Feb 9, 2012 at 3:47 PM, Peter De Schrijver
<pdeschrijver@xxxxxxxxxx> wrote:
> Prepare the Tegra secondary CPU core bringup code for other Tegra variants.
> The reset handler is also generalized to allow for future introduction of
> powersaving modes which turn off the CPU cores.
>
> Based on work by:
>
> Scott Williams <scwilliams@xxxxxxxxxx>
> Chris Johnson <cwj@xxxxxxxxxx>
> Colin Cross <ccross@xxxxxxxxxxx>
>
> Signed-off-by: Peter De Schrijver <pdeschrijver@xxxxxxxxxx>
> ---
<snip>
> diff --git a/arch/arm/mach-tegra/headsmp.S b/arch/arm/mach-tegra/headsmp.S
> index b5349b2..7973f1c 100644
> --- a/arch/arm/mach-tegra/headsmp.S
> +++ b/arch/arm/mach-tegra/headsmp.S
<snip>
> @@ -47,15 +64,116 @@ ENTRY(v7_invalidate_l1)
> mov pc, lr
> ENDPROC(v7_invalidate_l1)
>
> +
> ENTRY(tegra_secondary_startup)
> - msr cpsr_fsxc, #0xd3
> bl v7_invalidate_l1
> - mrc p15, 0, r0, c0, c0, 5
> - and r0, r0, #15
> - ldr r1, =0x6000f100
> - str r0, [r1]
> -1: ldr r2, [r1]
> - cmp r0, r2
> - beq 1b
> + mov32 r0, 0xC5ACCE55
> + mcr p14, 0, r0, c7, c12, 6
One minor nit, you should comment that this is enabling coresight.
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