linux-kernel - Re: [PATCH v2 2/3] ARM: tegra: Add SMMU enabler in AHB

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Message-ID: <20120424123248.GG8444@arwen.pp.htv.fi>
Date:	Tue, 24 Apr 2012 15:32:52 +0300
From:	Felipe Balbi <balbi@...com>
To:	Hiroshi DOYU <hdoyu@...dia.com>
Cc:	linux-tegra@...r.kernel.org, Felipe Balbi <balbi@...com>,
	Colin Cross <ccross@...roid.com>,
	Olof Johansson <olof@...om.net>,
	Stephen Warren <swarren@...dotorg.org>,
	Russell King <linux@....linux.org.uk>,
	Tony Lindgren <tony@...mide.com>,
	H Hartley Sweeten <hsweeten@...ionengravers.com>,
	Jamie Iles <jamie@...ieiles.com>,
	Rob Herring <rob.herring@...xeda.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] ARM: tegra: Add SMMU enabler in AHB

Hi,

On Tue, Apr 24, 2012 at 03:05:15PM +0300, Hiroshi DOYU wrote:
> @@ -95,6 +98,21 @@ static inline void gizmo_writel(unsigned long value, unsigned long offset)
>  	writel(value, tegra_ahb->regs + offset);
>  }
>  
> +#ifdef CONFIG_ARCH_TEGRA_3x_SOC
> +
> +void tegra_ahb_enable_smmu(void)
> +{
> +	unsigned long val;
> +
> +	val = gizmo_readl(AHB_ARBITRATION_XBAR_CTRL);
> +	val |= AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE_DONE <<
> +		AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE_SHIFT;
> +	gizmo_writel(val, AHB_ARBITRATION_XBAR_CTRL);
> +}
> +EXPORT_SYMBOL(tegra_ahb_enable_smmu);

ok, so this is the only place where you need that global pointer. Who
would call this ? Can you do runtime detection of the SoC and enable
SMMU based on that ?

I mean, will this function always be called for TEGRA 3 SoCs or is there
another condition to that ?

-- 
balbi

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