[PATCH v2 3/5] ARM: OMAP2/3: intc: Add DT support for TI interrupt controller

[Grant Likely]

On Tue, Dec 20, 2011 at 02:39:56PM +0100, Benoit Cousson wrote:
> Add a function to initialize the OMAP2/3 interrupt controller (INTC)
> using a device tree node.
> 
> Replace some printk() with the proper pr_ macro.
> 
> Signed-off-by: Benoit Cousson <b-cousson at ti.com>
> Cc: Tony Lindgren <tony at atomide.com>
> Cc: Rob Herring <rob.herring at calxeda.com>

Acked-by: Grant Likely <grant.likely at secretlab.ca>

> ---
>  .../devicetree/bindings/arm/omap/intc.txt          |   27 ++++++++++++++++++
>  arch/arm/mach-omap2/common.h                       |   10 ++++++
>  arch/arm/mach-omap2/irq.c                          |   30 ++++++++++++++++++--
>  3 files changed, 64 insertions(+), 3 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/arm/omap/intc.txt
> 
> diff --git a/Documentation/devicetree/bindings/arm/omap/intc.txt b/Documentation/devicetree/bindings/arm/omap/intc.txt
> new file mode 100644
> index 0000000..f2583e6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/omap/intc.txt
> @@ -0,0 +1,27 @@
> +* OMAP Interrupt Controller
> +
> +OMAP2/3 are using a TI interrupt controller that can support several
> +configurable number of interrupts.
> +
> +Main node required properties:
> +
> +- compatible : should be:
> +	"ti,omap2-intc"
> +- interrupt-controller : Identifies the node as an interrupt controller
> +- #interrupt-cells : Specifies the number of cells needed to encode an
> +  interrupt source. The type shall be a <u32> and the value shall be 1.
> +
> +  The cell contains the interrupt number in the range [0-128].
> +- ti,intc-size: Number of interrupts handled by the interrupt controller.
> +- reg: physical base address and size of the intc registers map.
> +
> +Example:
> +
> +	intc: interrupt-controller at 1 {
> +		compatible = "ti,omap2-intc";
> +		interrupt-controller;
> +		#interrupt-cells = <1>;
> +		ti,intc-size = <96>;
> +		reg = <0x48200000 0x1000>;
> +	};
> +
> diff --git a/arch/arm/mach-omap2/common.h b/arch/arm/mach-omap2/common.h
> index 012bac7..bcfccc2 100644
> --- a/arch/arm/mach-omap2/common.h
> +++ b/arch/arm/mach-omap2/common.h
> @@ -156,6 +156,16 @@ void omap3_intc_resume_idle(void);
>  void omap2_intc_handle_irq(struct pt_regs *regs);
>  void omap3_intc_handle_irq(struct pt_regs *regs);
>  
> +struct device_node;
> +#ifdef CONFIG_OF
> +int __init intc_of_init(struct device_node *node, struct device_node *parent);
> +#else
> +int __init intc_of_init(struct device_node *node, struct device_node *parent)
> +{
> +	return 0;
> +}
> +#endif
> +
>  /*
>   * wfi used in low power code. Directly opcode is used instead
>   * of instruction to avoid mulit-omap build break
> diff --git a/arch/arm/mach-omap2/irq.c b/arch/arm/mach-omap2/irq.c
> index 2f65dfd..f3722b1 100644
> --- a/arch/arm/mach-omap2/irq.c
> +++ b/arch/arm/mach-omap2/irq.c
> @@ -18,6 +18,8 @@
>  #include <asm/exception.h>
>  #include <asm/mach/irq.h>
>  #include <linux/irqdomain.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
>  
>  
>  /* selected INTC register offsets */
> @@ -180,7 +182,7 @@ static void __init omap_init_irq(u32 base, int nr_irqs)
>  		/* Static mapping, never released */
>  		bank->base_reg = ioremap(base, SZ_4K);
>  		if (!bank->base_reg) {
> -			printk(KERN_ERR "Could not ioremap irq bank%i\n", i);
> +			pr_err("Could not ioremap irq bank%i\n", i);
>  			continue;
>  		}
>  
> @@ -193,8 +195,8 @@ static void __init omap_init_irq(u32 base, int nr_irqs)
>  		nr_banks++;
>  	}
>  
> -	printk(KERN_INFO "Total of %ld interrupts on %d active controller%s\n",
> -	       nr_of_irqs, nr_banks, nr_banks > 1 ? "s" : "");
> +	pr_info("Total of %ld interrupts on %d active controller%s\n",
> +		nr_of_irqs, nr_banks, nr_banks > 1 ? "s" : "");
>  }
>  
>  void __init omap2_init_irq(void)
> @@ -252,6 +254,28 @@ asmlinkage void __exception_irq_entry omap2_intc_handle_irq(struct pt_regs *regs
>  	omap_intc_handle_irq(base_addr, regs);
>  }
>  
> +int __init intc_of_init(struct device_node *node, struct device_node *parent)
> +{
> +	struct resource res;
> +	u32 nr_irqs = 96;
> +
> +	if (WARN_ON(!node))
> +		return -ENODEV;
> +
> +	if (of_address_to_resource(node, 0, &res)) {
> +		WARN(1, "unable to get intc registers\n");
> +		return -EINVAL;
> +	}
> +
> +	if (of_property_read_u32(node, "ti,intc-size", &nr_irqs))
> +		pr_warn("unable to get intc-size, default to %d\n", nr_irqs);
> +
> +	omap_init_irq(res.start, nr_irqs);
> +	domain.of_node = of_node_get(node);
> +
> +	return 0;
> +}
> +
>  #ifdef CONFIG_ARCH_OMAP3
>  static struct omap3_intc_regs intc_context[ARRAY_SIZE(irq_banks)];
>  
> -- 
> 1.7.0.4
> 
> 
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