linux-kernel - Re: [PATCH v2 04/28] ARM: mm: cache-l2x0: Add support for re-enabling l2x0

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Date:	Tue, 25 Jan 2011 15:14:24 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Colin Cross <ccross@...roid.com>
Cc:	linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	olof@...om.net, konkers@...roid.com,
	Russell King <linux@....linux.org.uk>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Tony Lindgren <tony@...mide.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 04/28] ARM: mm: cache-l2x0: Add support for
 re-enabling l2x0

On Mon, 2011-01-24 at 02:01 +0000, Colin Cross wrote:
> --- a/arch/arm/mm/cache-l2x0.c
> +++ b/arch/arm/mm/cache-l2x0.c
> @@ -252,16 +252,26 @@ static void l2x0_flush_range(unsigned long start, unsigned long end)
>         spin_unlock_irqrestore(&l2x0_lock, flags);
>  }
> 
> +/* enables l2x0 after l2x0_disable, does not invalidate */
> +void l2x0_enable(void)
> +{
> +       unsigned long flags;
> +
> +       spin_lock_irqsave(&l2x0_lock, flags);
> +       writel_relaxed(1, l2x0_base + L2X0_CTRL);
> +       spin_unlock_irqrestore(&l2x0_lock, flags);
> +}
> +
>  static void l2x0_disable(void)
>  {
>         unsigned long flags;
> 
>         spin_lock_irqsave(&l2x0_lock, flags);
> -       writel(0, l2x0_base + L2X0_CTRL);
> +       writel_relaxed(0, l2x0_base + L2X0_CTRL);
>         spin_unlock_irqrestore(&l2x0_lock, flags);
>  }
> 
> -void __init l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
> +void l2x0_init(void __iomem *base, __u32 aux_val, __u32 aux_mask)
>  {
>         __u32 aux;
>         __u32 cache_id;

So this assumes that the L2 registers are accessible. I suspect the
platform code calling it should know this.

The patch looks fine.

Acked-by: Catalin Marinas <catalin.marinas@....com>


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