[PATCH v4 1/6] ARM: at91/aic: add irq domain and device tree support
Grant Likely
grant.likely at secretlab.ca
Fri Jan 6 05:02:18 EST 2012
On Thu, Jan 05, 2012 at 05:26:48PM +0100, Nicolas Ferre wrote:
> Hi Grant,
>
> Thanks for your review.
>
> Some answer following...
>
> On 01/04/2012 08:40 PM, Grant Likely :
>
> [..]
>
> >> --- a/arch/arm/mach-at91/irq.c
> >> +++ b/arch/arm/mach-at91/irq.c
> >> @@ -24,6 +24,10 @@
> >> #include <linux/module.h>
> >> #include <linux/mm.h>
> >> #include <linux/types.h>
> >> +#include <linux/of_address.h>
> >> +#include <linux/of_irq.h>
> >> +#include <linux/irqdomain.h>
> >> +#include <linux/err.h>
> >>
> >> #include <mach/hardware.h>
> >> #include <asm/irq.h>
> >> @@ -34,22 +38,28 @@
> >> #include <asm/mach/map.h>
> >>
> >> void __iomem *at91_aic_base;
> >> +static struct irq_domain at91_aic_domain;
> >> +
> >> +static inline unsigned int aic_irq(struct irq_data *d)
> >> +{
> >> + return d->hwirq;
> >> +}
> >
> > This is a useless macro. Drop it.
>
> Ok. That was overkill ;-)
>
> [..]
>
> >> @@ -90,13 +100,13 @@ static u32 backups;
> >>
> >> static int at91_aic_set_wake(struct irq_data *d, unsigned value)
> >> {
> >> - if (unlikely(d->irq >= 32))
> >> + if (unlikely(aic_irq(d) >= at91_aic_domain.nr_irq))
> > I don't think you need to derefernce the irq_domain.nr_irq here. Just
> > keep the test for >= 32.
>
> Well I would like to keep it referring to this value as we may increase
> the number of irq handled by this controller in the future...
>
> [..]
>
> >> +#if defined(CONFIG_OF)
> >> +static int __init __at91_aic_of_init(struct device_node *node,
> >> + struct device_node *parent)
> >> +{
> >> + at91_aic_base = of_iomap(node, 0);
> >> + at91_aic_domain.of_node = of_node_get(node);
> >> +
> >> + return 0;
> >> +}
> >> +
> >> +static const struct of_device_id aic_ids[] __initconst = {
> >> + { .compatible = "atmel,at91rm9200-aic", .data = __at91_aic_of_init },
> >> + { /*sentinel*/ }
> >> +};
> >> +
> >> +static void __init at91_aic_of_init(void)
> >> +{
> >> + of_irq_init(aic_ids);
> >> +}
> >> +#else
> >> +static void __init at91_aic_of_init(void) {}
> >> +#endif
> >> +
> >> /*
> >> * Initialize the AIC interrupt controller.
> >> */
> >> void __init at91_aic_init(unsigned int priority[NR_AIC_IRQS])
> >> {
> >> unsigned int i;
> >> + int hwirq, irq;
> >>
> >> - at91_aic_base = ioremap(AT91_AIC, 512);
> >> + if(of_have_populated_dt())
> >> + at91_aic_of_init();
> >> + else
> >> + at91_aic_base = ioremap(AT91_AIC, 512);
> >>
> >> if (!at91_aic_base)
> >> - panic("Impossible to ioremap AT91_AIC\n");
> >> + panic("Unable to ioremap AIC registers\n");
> >> +
> >> + /* Add irq domain for AIC */
> >> + at91_aic_domain.nr_irq = NR_AIC_IRQS;
> >> + at91_aic_domain.irq_base = irq_alloc_descs(-1, AIC_BASE_IRQ,
> >> + at91_aic_domain.nr_irq, 0);
> >> + if (IS_ERR_VALUE(at91_aic_domain.irq_base)) {
> >> + WARN(1, "Cannot allocate irq_descs, assuming pre-allocated\n");
> >> + at91_aic_domain.irq_base = AIC_BASE_IRQ;
> >> + }
> >> + at91_aic_domain.ops = &irq_domain_simple_ops;
> >> + irq_domain_add(&at91_aic_domain);
> >
> > Nothing special is being done with the irq domain. Please use
> > irq_domain_add_simple(). It will make things easier for the next
> > round of irq_domain patches that I'm getting ready to post.
>
> Fair enough, but I have one question: how do I specify "nr_irq" in the
> domain created by irq_domain_add_simple()? Maybe it is not needed?
Fix the irq_domain_add_simple() helper to accept a nr_irq parameter. :-)
g.
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