[RFC/PATCH 2/4] Turn xics_setup_8259_cascade() into a generic pseries_setup_i8259_cascade()

[Benjamin Herrenschmidt]

On Tue, 2008-04-01 at 17:42 +1100, Michael Ellerman wrote:
> Remove the xics references from xics_setup_8259_cascade(), and merge the
> good bits from the almost identical logic in pseries_mpic_init_IRQ().
> 
> Signed-off-by: Michael Ellerman <michael at ellerman.id.au>

Acked-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>

> ---
>  arch/powerpc/platforms/pseries/setup.c |   20 ++++++++++++--------
>  1 files changed, 12 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
> index 43e4801..1e1faa1 100644
> --- a/arch/powerpc/platforms/pseries/setup.c
> +++ b/arch/powerpc/platforms/pseries/setup.c
> @@ -127,28 +127,32 @@ void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
>  	desc->chip->eoi(irq);
>  }
>  
> -static void __init xics_setup_8259_cascade(void)
> +static void __init pseries_setup_i8259_cascade(void)
>  {
>  	struct device_node *np, *old, *found = NULL;
> -	int cascade, naddr;
> +	unsigned int cascade;
>  	const u32 *addrp;
>  	unsigned long intack = 0;
> +	int naddr;
>  
> -	for_each_node_by_type(np, "interrupt-controller")
> +	for_each_node_by_type(np, "interrupt-controller") {
>  		if (of_device_is_compatible(np, "chrp,iic")) {
>  			found = np;
>  			break;
>  		}
> +	}
> +
>  	if (found == NULL) {
> -		printk(KERN_DEBUG "xics: no ISA interrupt controller\n");
> +		printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
>  		return;
>  	}
> +
>  	cascade = irq_of_parse_and_map(found, 0);
>  	if (cascade == NO_IRQ) {
> -		printk(KERN_ERR "xics: failed to map cascade interrupt");
> +		printk(KERN_ERR "pic: failed to map cascade interrupt");
>  		return;
>  	}
> -	pr_debug("xics: cascade mapped to irq %d\n", cascade);
> +	pr_debug("pic: cascade mapped to irq %d\n", cascade);
>  
>  	for (old = of_node_get(found); old != NULL ; old = np) {
>  		np = of_get_parent(old);
> @@ -166,7 +170,7 @@ static void __init xics_setup_8259_cascade(void)
>  			intack |= ((unsigned long)addrp[naddr-2]) << 32;
>  	}
>  	if (intack)
> -		printk(KERN_DEBUG "xics: PCI 8259 intack at 0x%016lx\n", intack);
> +		printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
>  	i8259_init(found, intack);
>  	of_node_put(found);
>  	set_irq_chained_handler(cascade, pseries_8259_cascade);
> @@ -254,7 +258,7 @@ static void __init pseries_mpic_init_IRQ(void)
>  static void __init pseries_xics_init_IRQ(void)
>  {
>  	xics_init_IRQ();
> -	xics_setup_8259_cascade();
> +	pseries_setup_i8259_cascade();
>  }
>  
>  static void pseries_lpar_enable_pmcs(void)