From: Felipe Balbi <[email protected]>
Subject: Re: [PATCH v2 2/3] ARM: tegra: Add SMMU enabler in AHB
Date: Tue, 24 Apr 2012 14:32:52 +0200
Message-ID: <[email protected]>
> * PGP Signed by an unknown key
>
> 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 ?
Only Tegra3 has SMMU.
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