linux-kernel - Re: [PATCH 3/3] ARM: gic: add OF based initialization

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Date:	Mon, 26 Sep 2011 20:57:04 +0100
From:	Jamie Iles <jamie@...ieiles.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	grant.likely@...retlab.ca, marc.zyngier@....com,
	thomas.abraham@...aro.org, jamie@...ieiles.com, b-cousson@...com,
	shawn.guo@...aro.org, dave.martin@...aro.org,
	linux@....linux.org.uk, Rob Herring <rob.herring@...xeda.com>
Subject: Re: [PATCH 3/3] ARM: gic: add OF based initialization

Hi Rob,

On Tue, Sep 20, 2011 at 03:24:04PM -0500, Rob Herring wrote:
[...]
> +int __init gic_of_init(struct device_node *node, struct device_node *parent)
> +{
> +	void __iomem *cpu_base;
> +	void __iomem *dist_base;
> +	int irq;
> +	struct irq_domain *domain = &gic_data[gic_cnt].domain;
> +
> +	if (WARN_ON(!node))
> +		return -ENODEV;
> +
> +	dist_base = of_iomap(node, 0);
> +	WARN(!dist_base, "unable to map gic dist registers\n");
> +
> +	cpu_base = of_iomap(node, 1);
> +	WARN(!cpu_base, "unable to map gic cpu registers\n");
> +
> +	domain->nr_irq = gic_irq_count(dist_base);
> +	/* subtract off SGIs. Also subtract off PPIs for secondary GICs */
> +	if (parent)
> +		domain->nr_irq -= 32;
> +	else
> +		domain->nr_irq -= 16;
> +
> +	domain->irq_base = irq_alloc_descs(-1, 16, domain->nr_irq, numa_node_id());

The way I understand irq_alloc_descs() (probably not very well) is that 
having the irq parameter < 0 and the from parameter 16 means that it 
needs to find domain->nr_irq descs starting from at least 16.  But if 
the base is greater than 16, does this still work with the gic entry 
macros as they are?

Jamie
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